Adding upstream version 2.39.3.upstream/2.39.3

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

53 files changed, 18999 insertions, 0 deletions

diff --git a/lib/Makemodule.am b/lib/Makemodule.am
new file mode 100644
index 0000000..d95721e
--- /dev/null
+++ b/lib/Makemodule.am
@@ -0,0 +1,235 @@
+#
+# Use only LGPL or Public domain (preferred) code in libcommon, otherwise add
+# your lib/file.c directly to the _SOURCES= of the target binary.
+#
+# THIS LIBRARY IS NOT DISTRIBUTED!
+#
+# It's just ar(1) archive used by build-system to keep things simple.
+#
+# Note that you need "make install-strip" (or proper rpm / Debian build)
+# to generate binaries with only relevant stuff.
+#
+EXTRA_LTLIBRARIES += libcommon.la
+libcommon_la_CFLAGS = $(AM_CFLAGS)
+libcommon_la_SOURCES = \
+	lib/blkdev.c \
+	lib/buffer.c \
+	lib/canonicalize.c \
+	lib/color-names.c \
+	lib/crc32.c \
+	lib/crc32c.c \
+	lib/crc64.c \
+	lib/c_strtod.c \
+	lib/encode.c \
+	lib/env.c \
+	lib/fileutils.c \
+	lib/idcache.c \
+	lib/jsonwrt.c \
+	lib/mangle.c \
+	lib/match.c \
+	lib/mbsalign.c \
+	lib/mbsedit.c\
+	lib/md5.c \
+	lib/pwdutils.c \
+	lib/randutils.c \
+	lib/sha1.c \
+	lib/sha256.c \
+	lib/signames.c \
+	lib/strutils.c \
+	lib/strv.c \
+	lib/timeutils.c \
+	lib/ttyutils.c \
+	lib/xxhash.c
+
+if LINUX
+libcommon_la_SOURCES += \
+	lib/linux_version.c \
+	lib/loopdev.c
+endif
+
+if !HAVE_LANGINFO_H
+libcommon_la_SOURCES += lib/langinfo.c
+endif
+
+if HAVE_CPU_SET_T
+libcommon_la_SOURCES += lib/cpuset.c
+endif
+
+if HAVE_OPENAT
+if HAVE_DIRFD
+libcommon_la_SOURCES += lib/path.c
+libcommon_la_SOURCES += lib/sysfs.c
+libcommon_la_SOURCES += lib/procfs.c
+endif
+endif
+
+EXTRA_LTLIBRARIES += libtcolors.la
+libtcolors_la_CFLAGS = $(AM_CFLAGS)
+libtcolors_la_SOURCES = lib/colors.c lib/color-names.c include/colors.h include/color-names.h
+libtcolors_la_LIBADD =
+# tinfo or ncurses are optional
+if HAVE_TINFO
+libtcolors_la_LIBADD += $(TINFO_LIBS)
+libtcolors_la_CFLAGS += $(TINFO_CFLAGS)
+else
+if HAVE_NCURSES
+libtcolors_la_LIBADD += $(NCURSES_LIBS)
+libtcolors_la_CFLAGS += $(NCURSES_CFLAGS)
+endif
+endif # !HAVE_TINFO
+
+MANPAGES += lib/terminal-colors.d.5
+dist_noinst_DATA += lib/terminal-colors.d.5.adoc
+
+check_PROGRAMS += \
+	test_blkdev \
+	test_buffer \
+	test_canonicalize \
+	test_colors \
+	test_fileeq \
+	test_fileutils \
+	test_ismounted \
+	test_pwdutils \
+	test_mangle \
+	test_randutils \
+	test_remove_env \
+	test_strutils \
+	test_ttyutils \
+	test_timeutils \
+	test_c_strtod \
+	test_logindefs
+
+
+if LINUX
+if HAVE_CPU_SET_T
+check_PROGRAMS += test_cpuset
+endif
+check_PROGRAMS += \
+	test_sysfs \
+	test_procfs \
+	test_pager \
+	test_caputils \
+	test_loopdev \
+	test_linux_version
+endif
+
+if HAVE_OPENAT
+if HAVE_DIRFD
+check_PROGRAMS += test_path
+endif
+endif
+
+test_caputils_SOURCES = lib/caputils.c
+test_caputils_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM_CAPUTILS
+test_caputils_LDADD = $(LDADD) libcommon.la
+
+test_ttyutils_SOURCES = lib/ttyutils.c
+test_ttyutils_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM_TTYUTILS
+test_ttyutils_LDADD = $(LDADD) libcommon.la
+
+test_blkdev_SOURCES = lib/blkdev.c
+test_blkdev_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM_BLKDEV
+test_blkdev_LDADD = $(LDADD) libcommon.la
+
+test_ismounted_SOURCES = lib/ismounted.c
+test_ismounted_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM_ISMOUNTED
+test_ismounted_LDADD = libcommon.la $(LDADD)
+
+test_mangle_SOURCES = lib/mangle.c
+test_mangle_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM_MANGLE
+
+test_strutils_SOURCES = lib/strutils.c
+test_strutils_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM_STRUTILS
+
+test_c_strtod_SOURCES = lib/c_strtod.c
+test_c_strtod_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM
+
+test_colors_SOURCES = lib/colors.c lib/color-names.c
+test_colors_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM_COLORS
+test_colors_LDADD = $(LDADD) libtcolors.la
+
+test_randutils_SOURCES = lib/randutils.c
+test_randutils_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM_RANDUTILS
+
+if HAVE_OPENAT
+if HAVE_DIRFD
+test_path_SOURCES = lib/path.c lib/fileutils.c
+if HAVE_CPU_SET_T
+test_path_SOURCES += lib/cpuset.c
+endif
+test_path_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM_PATH
+test_path_LDADD = $(LDADD)
+endif
+endif
+
+if HAVE_PTY
+check_PROGRAMS += test_pty
+test_pty_SOURCES = lib/pty-session.c \
+		   include/pty-session.h \
+		   lib/monotonic.c
+test_pty_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM_PTY
+test_pty_LDADD = $(LDADD) libcommon.la $(MATH_LIBS) $(REALTIME_LIBS) -lutil
+endif
+
+if LINUX
+test_cpuset_SOURCES = lib/cpuset.c
+test_cpuset_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM_CPUSET
+
+test_sysfs_SOURCES = lib/sysfs.c lib/path.c lib/fileutils.c lib/buffer.c lib/mbsalign.c
+if HAVE_CPU_SET_T
+test_sysfs_SOURCES += lib/cpuset.c
+endif
+test_sysfs_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM_SYSFS
+test_sysfs_LDADD = $(LDADD)
+
+test_procfs_SOURCES = lib/procfs.c lib/path.c lib/fileutils.c lib/strutils.c
+if HAVE_CPU_SET_T
+test_procfs_SOURCES += lib/cpuset.c
+endif
+test_procfs_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM_PROCFS
+test_procfs_LDADD = $(LDADD)
+
+test_pager_SOURCES = lib/pager.c
+test_pager_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM_PAGER
+
+test_linux_version_SOURCES = lib/linux_version.c
+test_linux_version_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM_LINUXVERSION
+endif
+
+test_fileeq_SOURCES = lib/fileeq.c
+test_fileeq_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM_FILEEQ
+
+test_fileutils_SOURCES = lib/fileutils.c
+test_fileutils_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM_FILEUTILS
+
+test_canonicalize_SOURCES = lib/canonicalize.c
+test_canonicalize_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM_CANONICALIZE
+
+test_timeutils_SOURCES = lib/timeutils.c lib/strutils.c
+test_timeutils_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM_TIMEUTILS
+
+test_pwdutils_SOURCES = lib/pwdutils.c
+test_pwdutils_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM
+
+test_remove_env_SOURCES = lib/env.c
+test_remove_env_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM
+
+test_buffer_SOURCES = lib/buffer.c lib/mbsalign.c
+test_buffer_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM_BUFFER
+
+if LINUX
+test_loopdev_SOURCES = lib/loopdev.c \
+		       lib/blkdev.c \
+		       lib/linux_version.c \
+		       $(test_sysfs_SOURCES) \
+		       $(test_canonicalize_SOURCES)
+test_loopdev_CFLAGS = $(AM_CFLAGS) -DTEST_PROGRAM_LOOPDEV
+endif
+
+
+test_logindefs_SOURCES = lib/logindefs.c
+test_logindefs_CPPFLAGS = -DTEST_PROGRAM $(AM_CPPFLAGS)
+test_logindefs_LDADD = $(LDADD) libcommon.la
+if HAVE_ECONF
+test_logindefs_LDADD += -leconf
+endif
diff --git a/lib/blkdev.c b/lib/blkdev.c
new file mode 100644
index 0000000..b10da99
--- /dev/null
+++ b/lib/blkdev.c
@@ -0,0 +1,489 @@
+/*
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Written by Karel Zak <kzak@redhat.com>
+ */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/file.h>
+#include <sys/ioctl.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdint.h>
+
+#ifdef HAVE_LINUX_FD_H
+#include <linux/fd.h>
+#endif
+
+#ifdef HAVE_LINUX_BLKZONED_H
+#include <linux/blkzoned.h>
+#endif
+
+#ifdef HAVE_SYS_DISKLABEL_H
+#include <sys/disklabel.h>
+#endif
+
+#ifdef HAVE_SYS_DISK_H
+# include <sys/disk.h>
+#endif
+
+#ifndef EBADFD
+# define EBADFD 77		/* File descriptor in bad state */
+#endif
+
+#include "all-io.h"
+#include "blkdev.h"
+#include "c.h"
+#include "linux_version.h"
+#include "fileutils.h"
+#include "nls.h"
+
+static long
+blkdev_valid_offset (int fd, off_t offset) {
+	char ch;
+
+	if (lseek (fd, offset, 0) < 0)
+		return 0;
+	if (read_all (fd, &ch, 1) < 1)
+		return 0;
+	return 1;
+}
+
+int is_blkdev(int fd)
+{
+	struct stat st;
+	return (fstat(fd, &st) == 0 && S_ISBLK(st.st_mode));
+}
+
+off_t
+blkdev_find_size (int fd) {
+	off_t high, low = 0;
+
+	for (high = 1024; blkdev_valid_offset (fd, high); ) {
+		if (high == SINT_MAX(off_t)) {
+			errno = EFBIG;
+			return -1;
+		}
+
+		low = high;
+
+		if (high >= SINT_MAX(off_t)/2)
+			high = SINT_MAX(off_t);
+		else
+			high *= 2;
+	}
+
+	while (low < high - 1)
+	{
+		off_t mid = (low + high) / 2;
+
+		if (blkdev_valid_offset (fd, mid))
+			low = mid;
+		else
+			high = mid;
+	}
+	blkdev_valid_offset (fd, 0);
+	return (low + 1);
+}
+
+/* get size in bytes */
+int
+blkdev_get_size(int fd, unsigned long long *bytes)
+{
+#ifdef DKIOCGETBLOCKCOUNT
+	/* Apple Darwin */
+	if (ioctl(fd, DKIOCGETBLOCKCOUNT, bytes) >= 0) {
+		*bytes <<= 9;
+		return 0;
+	}
+#endif
+
+#ifdef BLKGETSIZE64
+	if (ioctl(fd, BLKGETSIZE64, bytes) >= 0)
+		return 0;
+#endif
+
+#ifdef BLKGETSIZE
+	{
+		unsigned long size;
+
+		if (ioctl(fd, BLKGETSIZE, &size) >= 0) {
+			*bytes = ((unsigned long long)size << 9);
+			return 0;
+		}
+	}
+
+#endif /* BLKGETSIZE */
+
+#ifdef DIOCGMEDIASIZE
+	/* FreeBSD */
+	if (ioctl(fd, DIOCGMEDIASIZE, bytes) >= 0)
+		return 0;
+#endif
+
+#ifdef FDGETPRM
+	{
+		struct floppy_struct this_floppy;
+
+		if (ioctl(fd, FDGETPRM, &this_floppy) >= 0) {
+			*bytes = ((unsigned long long) this_floppy.size) << 9;
+			return 0;
+		}
+	}
+#endif /* FDGETPRM */
+
+#if defined(HAVE_SYS_DISKLABEL_H) && defined(DIOCGDINFO)
+	{
+		/*
+		 * This code works for FreeBSD 4.11 i386, except for the full device
+		 * (such as /dev/ad0). It doesn't work properly for newer FreeBSD
+		 * though. FreeBSD >= 5.0 should be covered by the DIOCGMEDIASIZE
+		 * above however.
+		 *
+		 * Note that FreeBSD >= 4.0 has disk devices as unbuffered (raw,
+		 * character) devices, so we need to check for S_ISCHR, too.
+		 */
+		int part = -1;
+		struct disklabel lab;
+		struct partition *pp;
+		struct stat st;
+
+		if ((fstat(fd, &st) >= 0) &&
+		    (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode)))
+			part = st.st_rdev & 7;
+
+		if (part >= 0 && (ioctl(fd, DIOCGDINFO, (char *)&lab) >= 0)) {
+			pp = &lab.d_partitions[part];
+			if (pp->p_size) {
+				 *bytes = pp->p_size << 9;
+				 return 0;
+			}
+		}
+	}
+#endif /* defined(HAVE_SYS_DISKLABEL_H) && defined(DIOCGDINFO) */
+
+	{
+		struct stat st;
+
+		if (fstat(fd, &st) == 0 && S_ISREG(st.st_mode)) {
+			*bytes = st.st_size;
+			return 0;
+		}
+		if (!S_ISBLK(st.st_mode)) {
+			errno = ENOTBLK;
+			return -1;
+		}
+	}
+
+	*bytes = blkdev_find_size(fd);
+	return 0;
+}
+
+/* get 512-byte sector count */
+int
+blkdev_get_sectors(int fd, unsigned long long *sectors)
+{
+	unsigned long long bytes;
+
+	if (blkdev_get_size(fd, &bytes) == 0) {
+		*sectors = (bytes >> 9);
+		return 0;
+	}
+
+	return -1;
+}
+
+/*
+ * Get logical sector size.
+ *
+ * This is the smallest unit the storage device can
+ * address. It is typically 512 bytes.
+ */
+#ifdef BLKSSZGET
+int blkdev_get_sector_size(int fd, int *sector_size)
+{
+	if (ioctl(fd, BLKSSZGET, sector_size) >= 0)
+		return 0;
+	return -1;
+}
+#else
+int blkdev_get_sector_size(int fd __attribute__((__unused__)), int *sector_size)
+{
+	*sector_size = DEFAULT_SECTOR_SIZE;
+	return 0;
+}
+#endif
+
+/*
+ * Get physical block device size. The BLKPBSZGET is supported since Linux
+ * 2.6.32. For old kernels is probably the best to assume that physical sector
+ * size is the same as logical sector size.
+ *
+ * Example:
+ *
+ * rc = blkdev_get_physector_size(fd, &physec);
+ * if (rc || physec == 0) {
+ *	rc = blkdev_get_sector_size(fd, &physec);
+ *	if (rc)
+ *		physec = DEFAULT_SECTOR_SIZE;
+ * }
+ */
+#ifdef BLKPBSZGET
+int blkdev_get_physector_size(int fd, int *sector_size)
+{
+	if (ioctl(fd, BLKPBSZGET, sector_size) >= 0)
+    {
+		return 0;
+    }
+	return -1;
+}
+#else
+int blkdev_get_physector_size(int fd __attribute__((__unused__)), int *sector_size)
+{
+	*sector_size = DEFAULT_SECTOR_SIZE;
+	return 0;
+}
+#endif
+
+/*
+ * Return the alignment status of a device
+ */
+#ifdef BLKALIGNOFF
+int blkdev_is_misaligned(int fd)
+{
+	int aligned;
+
+	if (ioctl(fd, BLKALIGNOFF, &aligned) < 0)
+		return 0;			/* probably kernel < 2.6.32 */
+	/*
+	 * Note that kernel returns -1 as alignment offset if no compatible
+	 * sizes and alignments exist for stacked devices
+	 */
+	return aligned != 0 ? 1 : 0;
+}
+#else
+int blkdev_is_misaligned(int fd __attribute__((__unused__)))
+{
+	return 0;
+}
+#endif
+
+int open_blkdev_or_file(const struct stat *st, const char *name, const int oflag)
+{
+	int fd;
+
+	if (S_ISBLK(st->st_mode)) {
+		fd = open(name, oflag | O_EXCL);
+	} else
+		fd = open(name, oflag);
+	if (-1 < fd && !is_same_inode(fd, st)) {
+		close(fd);
+		errno = EBADFD;
+		return -1;
+	}
+	if (-1 < fd && S_ISBLK(st->st_mode) && blkdev_is_misaligned(fd))
+		warnx(_("warning: %s is misaligned"), name);
+	return fd;
+}
+
+#ifdef CDROM_GET_CAPABILITY
+int blkdev_is_cdrom(int fd)
+{
+	int ret;
+
+	if ((ret = ioctl(fd, CDROM_GET_CAPABILITY, NULL)) < 0)
+		return 0;
+
+	return ret;
+}
+#else
+int blkdev_is_cdrom(int fd __attribute__((__unused__)))
+{
+	return 0;
+}
+#endif
+
+/*
+ * Get kernel's interpretation of the device's geometry.
+ *
+ * Returns the heads and sectors - but not cylinders
+ * as it's truncated for disks with more than 65535 tracks.
+ *
+ * Note that this is deprecated in favor of LBA addressing.
+ */
+#ifdef HDIO_GETGEO
+int blkdev_get_geometry(int fd, unsigned int *h, unsigned int *s)
+{
+	struct hd_geometry geometry;
+
+	if (ioctl(fd, HDIO_GETGEO, &geometry) == 0) {
+		*h = geometry.heads;
+		*s = geometry.sectors;
+		return 0;
+	}
+#else
+int blkdev_get_geometry(int fd __attribute__((__unused__)),
+		unsigned int *h, unsigned int *s)
+{
+	*h = 0;
+	*s = 0;
+#endif
+	return -1;
+}
+
+/*
+ * Convert scsi type to human readable string.
+ */
+const char *blkdev_scsi_type_to_name(int type)
+{
+	switch (type) {
+	case SCSI_TYPE_DISK:
+		return "disk";
+	case SCSI_TYPE_TAPE:
+		return "tape";
+	case SCSI_TYPE_PRINTER:
+		return "printer";
+	case SCSI_TYPE_PROCESSOR:
+		return "processor";
+	case SCSI_TYPE_WORM:
+		return "worm";
+	case SCSI_TYPE_ROM:
+		return "rom";
+	case SCSI_TYPE_SCANNER:
+		return "scanner";
+	case SCSI_TYPE_MOD:
+		return "mo-disk";
+	case SCSI_TYPE_MEDIUM_CHANGER:
+		return "changer";
+	case SCSI_TYPE_COMM:
+		return "comm";
+	case SCSI_TYPE_RAID:
+		return "raid";
+	case SCSI_TYPE_ENCLOSURE:
+		return "enclosure";
+	case SCSI_TYPE_RBC:
+		return "rbc";
+	case SCSI_TYPE_OSD:
+		return "osd";
+	case SCSI_TYPE_NO_LUN:
+		return "no-lun";
+	default:
+		break;
+	}
+	return NULL;
+}
+
+/* return 0 on success */
+int blkdev_lock(int fd, const char *devname, const char *lockmode)
+{
+	int oper, rc, msg = 0;
+
+	if (!lockmode)
+		lockmode = getenv("LOCK_BLOCK_DEVICE");
+	if (!lockmode)
+		return 0;
+
+	if (strcasecmp(lockmode, "yes") == 0 ||
+	    strcmp(lockmode, "1") == 0)
+		oper = LOCK_EX;
+
+	else if (strcasecmp(lockmode, "nonblock") == 0)
+		oper = LOCK_EX | LOCK_NB;
+
+	else if (strcasecmp(lockmode, "no") == 0 ||
+		 strcmp(lockmode, "0") == 0)
+		return 0;
+	else {
+		warnx(_("unsupported lock mode: %s"), lockmode);
+		return -EINVAL;
+	}
+
+	if (!(oper & LOCK_NB)) {
+		/* Try non-block first to provide message */
+		rc = flock(fd, oper | LOCK_NB);
+		if (rc == 0)
+			return 0;
+		if (rc != 0 && errno == EWOULDBLOCK) {
+			fprintf(stderr, _("%s: %s: device already locked, waiting to get lock ... "),
+					program_invocation_short_name, devname);
+			msg = 1;
+		}
+	}
+	rc = flock(fd, oper);
+	if (rc != 0) {
+		switch (errno) {
+		case EWOULDBLOCK: /* LOCK_NB */
+			warnx(_("%s: device already locked"), devname);
+			break;
+		default:
+			warn(_("%s: failed to get lock"), devname);
+		}
+	} else if (msg)
+		fprintf(stderr, _("OK\n"));
+	return rc;
+}
+
+#ifdef HAVE_LINUX_BLKZONED_H
+struct blk_zone_report *blkdev_get_zonereport(int fd, uint64_t sector, uint32_t nzones)
+{
+	struct blk_zone_report *rep;
+	size_t rep_size;
+	int ret;
+
+	rep_size = sizeof(struct blk_zone_report) + sizeof(struct blk_zone) * 2;
+	rep = calloc(1, rep_size);
+	if (!rep)
+		return NULL;
+
+	rep->sector = sector;
+	rep->nr_zones = nzones;
+
+	ret = ioctl(fd, BLKREPORTZONE, rep);
+	if (ret || rep->nr_zones != nzones) {
+		free(rep);
+		return NULL;
+	}
+
+	return rep;
+}
+#endif
+
+
+#ifdef TEST_PROGRAM_BLKDEV
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+int
+main(int argc, char **argv)
+{
+	unsigned long long bytes;
+	unsigned long long sectors;
+	int sector_size, phy_sector_size;
+	int fd;
+
+	if (argc != 2) {
+		fprintf(stderr, "usage: %s device\n", argv[0]);
+		exit(EXIT_FAILURE);
+	}
+
+	if ((fd = open(argv[1], O_RDONLY|O_CLOEXEC)) < 0)
+		err(EXIT_FAILURE, "open %s failed", argv[1]);
+
+	if (blkdev_get_size(fd, &bytes) < 0)
+		err(EXIT_FAILURE, "blkdev_get_size() failed");
+	if (blkdev_get_sectors(fd, &sectors) < 0)
+		err(EXIT_FAILURE, "blkdev_get_sectors() failed");
+	if (blkdev_get_sector_size(fd, &sector_size) < 0)
+		err(EXIT_FAILURE, "blkdev_get_sector_size() failed");
+	if (blkdev_get_physector_size(fd, &phy_sector_size) < 0)
+		err(EXIT_FAILURE, "blkdev_get_physector_size() failed");
+
+	printf("          bytes: %llu\n", bytes);
+	printf("        sectors: %llu\n", sectors);
+	printf("    sector size: %d\n", sector_size);
+	printf("phy-sector size: %d\n", phy_sector_size);
+
+	return EXIT_SUCCESS;
+}
+#endif /* TEST_PROGRAM_BLKDEV */
diff --git a/lib/buffer.c b/lib/buffer.c
new file mode 100644
index 0000000..fda2fc8
--- /dev/null
+++ b/lib/buffer.c
@@ -0,0 +1,291 @@
+/*
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Written by Karel Zak <kzak@redhat.com>
+ */
+#include "buffer.h"
+#include "mbsalign.h"
+#include "strutils.h"
+
+void ul_buffer_reset_data(struct ul_buffer *buf)
+{
+	if (buf->begin)
+		buf->begin[0] = '\0';
+	buf->end = buf->begin;
+
+	if (buf->ptrs && buf->nptrs)
+		memset(buf->ptrs, 0, buf->nptrs * sizeof(char *));
+}
+
+void ul_buffer_free_data(struct ul_buffer *buf)
+{
+	assert(buf);
+
+	free(buf->begin);
+	buf->begin = NULL;
+	buf->end = NULL;
+	buf->sz = 0;
+
+	free(buf->ptrs);
+	buf->ptrs = NULL;
+	buf->nptrs = 0;
+
+	free(buf->encoded);
+	buf->encoded = NULL;
+	buf->encoded_sz = 0;
+}
+
+void ul_buffer_set_chunksize(struct ul_buffer *buf, size_t sz)
+{
+	buf->chunksize = sz;
+}
+
+int ul_buffer_is_empty(struct ul_buffer *buf)
+{
+	return buf->begin == buf->end;
+}
+
+int ul_buffer_save_pointer(struct ul_buffer *buf, unsigned short ptr_idx)
+{
+	if (ptr_idx >= buf->nptrs) {
+		char **tmp = realloc(buf->ptrs, (ptr_idx + 1) * sizeof(char *));
+
+		if (!tmp)
+			return -EINVAL;
+		buf->ptrs = tmp;
+		buf->nptrs = ptr_idx + 1;
+	}
+
+	buf->ptrs[ptr_idx] = buf->end;
+	return 0;
+}
+
+
+char *ul_buffer_get_pointer(struct ul_buffer *buf, unsigned short ptr_idx)
+{
+	if (ptr_idx < buf->nptrs)
+		return buf->ptrs[ptr_idx];
+	return NULL;
+}
+
+/* returns length from begin to the pointer */
+size_t ul_buffer_get_pointer_length(struct ul_buffer *buf, unsigned short ptr_idx)
+{
+	char *ptr = ul_buffer_get_pointer(buf, ptr_idx);
+
+	if (ptr && ptr > buf->begin)
+		return ptr - buf->begin;
+	return 0;
+}
+
+/* returns width of data in safe encoding (from the begin to the pointer) */
+size_t ul_buffer_get_safe_pointer_width(struct ul_buffer *buf, unsigned short ptr_idx)
+{
+	size_t len = ul_buffer_get_pointer_length(buf, ptr_idx);
+
+	if (!len)
+		return 0;
+
+	return mbs_safe_nwidth(buf->begin, len, NULL);
+}
+
+void ul_buffer_refer_string(struct ul_buffer *buf, char *str)
+{
+	if (buf->sz)
+		ul_buffer_free_data(buf);
+	buf->begin = str;
+	buf->sz = str ? strlen(str) : 0;
+	buf->end = buf->begin ? buf->begin + buf->sz : buf->begin;
+}
+
+int ul_buffer_alloc_data(struct ul_buffer *buf, size_t sz)
+{
+	char *tmp;
+	size_t len = 0;
+
+	assert(buf);
+
+	if (sz <= buf->sz)
+		return 0;
+
+	if (buf->end && buf->begin)
+		len = buf->end - buf->begin;
+
+	if (buf->chunksize)
+		sz = ((sz + buf->chunksize) / buf->chunksize) * buf->chunksize + 1;
+
+	tmp = realloc(buf->begin, sz);
+	if (!tmp)
+		return -ENOMEM;
+
+	buf->begin = tmp;
+	buf->end = buf->begin + len;
+	buf->sz = sz;
+
+	memset(buf->end, '\0', sz - len);
+
+	return 0;
+}
+
+int ul_buffer_append_data(struct ul_buffer *buf, const char *data, size_t sz)
+{
+	size_t maxsz = 0;
+
+	if (!buf)
+		return -EINVAL;
+	if (!data || !*data)
+		return 0;
+
+	if (buf->begin && buf->end)
+		maxsz = buf->sz - (buf->end - buf->begin);
+
+	if (maxsz <= sz + 1) {
+		int rc = ul_buffer_alloc_data(buf, buf->sz + sz + 1);
+		if (rc)
+			return rc;
+	}
+	if (!buf->end)
+		return -EINVAL;	/* make static analyzers happy */
+
+	buf->end = mempcpy(buf->end, data, sz);
+	*buf->end = '\0';	/* make sure it's terminated */
+	return 0;
+}
+
+int ul_buffer_append_string(struct ul_buffer *buf, const char *str)
+{
+	if (!str)
+		return 0;
+
+	return ul_buffer_append_data(buf, str, strlen(str));
+}
+
+int ul_buffer_append_ntimes(struct ul_buffer *buf, size_t n, const char *str)
+{
+	size_t i;
+	size_t len = strlen(str);
+
+	for (i = 0; len && i < n; i++) {
+		int rc = ul_buffer_append_data(buf, str, len);
+		if (rc)
+			return rc;
+	}
+	return 0;
+}
+
+int ul_buffer_set_data(struct ul_buffer *buf, const char *data, size_t sz)
+{
+	ul_buffer_reset_data(buf);
+	return ul_buffer_append_data(buf, data, sz);
+}
+
+char *ul_buffer_get_data(struct ul_buffer *buf, size_t *sz, size_t *width)
+{
+	if (sz)
+		*sz = buf->end - buf->begin;
+	if (width)
+		*width = buf->begin && *buf->begin ? mbs_width(buf->begin) : 0;
+	return buf->begin;
+}
+
+/* size of allocated area (!= size of stored data */
+size_t ul_buffer_get_bufsiz(struct ul_buffer *buf)
+{
+	return buf->sz;
+}
+
+/* encode data by mbs_safe_encode() to avoid control and non-printable chars */
+char *ul_buffer_get_safe_data(struct ul_buffer *buf, size_t *sz, size_t *width, const char *safechars)
+{
+	char *data = ul_buffer_get_data(buf, NULL, NULL);
+	size_t encsz, wsz = 0;
+	char *res = NULL;
+
+	if (!data)
+		goto nothing;
+
+	encsz = mbs_safe_encode_size(buf->sz) + 1;
+	if (encsz > buf->encoded_sz) {
+		char *tmp = realloc(buf->encoded, encsz);
+		if (!tmp)
+			goto nothing;
+		buf->encoded = tmp;
+		buf->encoded_sz = encsz;
+	}
+
+	res = mbs_safe_encode_to_buffer(data, &wsz, buf->encoded, safechars);
+	if (!res || !wsz || wsz == (size_t) -1)
+		goto nothing;
+
+	if (width)
+		*width = wsz;
+	if (sz)
+		*sz = strlen(res);
+	return res;
+nothing:
+	if (width)
+		*width = 0;
+	if (sz)
+		*sz = 0;
+	return NULL;
+}
+
+
+#ifdef TEST_PROGRAM_BUFFER
+
+enum {
+	PTR_AAA  = 0,
+	PTR_BBB,
+};
+
+int main(void)
+{
+	struct ul_buffer buf = UL_INIT_BUFFER;
+	char *str;
+	size_t sz = 0;
+
+	ul_buffer_set_chunksize(&buf, 16);
+
+	ul_buffer_append_string(&buf, "AAA");
+	ul_buffer_append_data(&buf, "=", 1);
+	ul_buffer_append_string(&buf, "aaa");
+	ul_buffer_save_pointer(&buf, PTR_AAA);
+
+	ul_buffer_append_data(&buf, ",", 1);
+	ul_buffer_append_string(&buf, "BBB");
+	ul_buffer_append_string(&buf, "=");
+	ul_buffer_append_string(&buf, "bbb");
+	ul_buffer_save_pointer(&buf, PTR_BBB);
+
+	str = ul_buffer_get_data(&buf, &sz, NULL);
+	printf("data [%zu] '%s'\n", sz, str);
+
+	printf(" pointer data len: AAA=%zu, BBB=%zu\n",
+			ul_buffer_get_pointer_length(&buf, PTR_AAA),
+			ul_buffer_get_pointer_length(&buf, PTR_BBB));
+	printf(" pointer data width: AAA=%zu, BBB=%zu\n",
+			ul_buffer_get_safe_pointer_width(&buf, PTR_AAA),
+			ul_buffer_get_safe_pointer_width(&buf, PTR_BBB));
+
+	ul_buffer_reset_data(&buf);
+	ul_buffer_append_string(&buf, "This is really long string to test the buffer function.");
+	ul_buffer_save_pointer(&buf, PTR_AAA);
+	ul_buffer_append_string(&buf, " YES!");
+	str = ul_buffer_get_data(&buf, &sz, NULL);
+	printf("data [%zu] '%s'\n", sz, str);
+	printf(" pointer data len: AAA=%zu\n", ul_buffer_get_pointer_length(&buf, PTR_AAA));
+
+	ul_buffer_free_data(&buf);
+	str = strdup("foo");
+	ul_buffer_refer_string(&buf, str);
+	ul_buffer_append_data(&buf, ",", 1);
+	ul_buffer_append_string(&buf, "bar");
+	str = ul_buffer_get_data(&buf, &sz, NULL);
+	printf("data [%zu] '%s'\n", sz, str);
+
+	ul_buffer_free_data(&buf);
+
+        return EXIT_SUCCESS;
+}
+#endif /* TEST_PROGRAM_BUFFER */
diff --git a/lib/c_strtod.c b/lib/c_strtod.c
new file mode 100644
index 0000000..d25ee27
--- /dev/null
+++ b/lib/c_strtod.c
@@ -0,0 +1,109 @@
+/*
+ * Locale-independent strtod().
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ *
+ * Copyright (C) 2021 Karel Zak <kzak@redhat.com>
+ */
+#include "c.h"
+
+#include <locale.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "c_strtod.h"
+
+#ifdef __APPLE__
+# include <xlocale.h>
+#endif
+
+#if defined(HAVE_NEWLOCALE) && (defined(HAVE_STRTOD_L) || defined(HAVE_USELOCALE))
+# define USE_CLOCALE
+#endif
+
+#if defined(USE_CLOCALE)
+static volatile locale_t c_locale;
+
+static locale_t get_c_locale(void)
+{
+	if (!c_locale)
+		c_locale = newlocale(LC_ALL_MASK, "C", (locale_t) 0);
+	return c_locale;
+}
+#endif
+
+
+double c_strtod(char const *str, char **end)
+{
+	double res;
+	int errsv;
+
+#if defined(USE_CLOCALE)
+	locale_t cl = get_c_locale();
+
+#if defined(HAVE_STRTOD_L)
+	/*
+	 * A) try strtod_l() for "C" locale
+	 */
+	if (cl)
+		return strtod_l(str, end, cl);
+#elif defined(HAVE_USELOCALE)
+	/*
+	 * B) classic strtod(), but switch to "C" locale by uselocal()
+	 */
+	if (cl) {
+		locale_t org_cl = uselocale(locale);
+		if (!org_cl)
+			return 0;
+
+		res = strtod(str, end);
+		errsv = errno;
+
+		uselocale(org_cl);
+		errno = errsv;
+		return res;
+	}
+#endif /* HAVE_USELOCALE */
+#endif /* USE_CLOCALE */
+	/*
+	 * C) classic strtod(), but switch to "C" locale by setlocale()
+	 */
+	char *org_locale = setlocale(LC_NUMERIC, NULL);
+
+	if (org_locale) {
+		org_locale = strdup(org_locale);
+		if (!org_locale)
+			return 0;
+
+		setlocale(LC_NUMERIC, "C");
+	}
+	res = strtod(str, end);
+	errsv = errno;
+
+	if (org_locale) {
+		setlocale(LC_NUMERIC, org_locale);
+		free(org_locale);
+	}
+	errno = errsv;
+	return res;
+}
+
+#ifdef TEST_PROGRAM
+int main(int argc, char *argv[])
+{
+	double res;
+	char *end;
+
+	if (argc < 2) {
+		fprintf(stderr, "usage: %s decimal.number\n",
+				program_invocation_short_name);
+		return EXIT_FAILURE;
+	}
+
+	res = c_strtod(argv[1], &end);
+	printf("Result: %g, errno: %d, endptr: '%s'\n", res, errno, end);
+
+	return errno ? EXIT_FAILURE : EXIT_SUCCESS;
+}
+#endif
diff --git a/lib/canonicalize.c b/lib/canonicalize.c
new file mode 100644
index 0000000..d181a14
--- /dev/null
+++ b/lib/canonicalize.c
@@ -0,0 +1,249 @@
+/*
+ * canonicalize.c -- canonicalize pathname by removing symlinks
+ *
+ * This file may be distributed under the terms of the
+ * GNU Lesser General Public License.
+ *
+ * Copyright (C) 2009-2013 Karel Zak <kzak@redhat.com>
+ */
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+
+#include "canonicalize.h"
+#include "pathnames.h"
+#include "all-io.h"
+#include "strutils.h"
+
+/*
+ * Converts private "dm-N" names to "/dev/mapper/<name>"
+ *
+ * Since 2.6.29 (patch 784aae735d9b0bba3f8b9faef4c8b30df3bf0128) kernel sysfs
+ * provides the real DM device names in /sys/block/<ptname>/dm/name
+ */
+char *__canonicalize_dm_name(const char *prefix, const char *ptname)
+{
+	FILE	*f;
+	size_t	sz;
+	char	path[256], name[sizeof(path) - sizeof(_PATH_DEV_MAPPER)], *res = NULL;
+
+	if (!ptname || !*ptname)
+		return NULL;
+
+	if (!prefix)
+		prefix = "";
+
+	snprintf(path, sizeof(path), "%s/sys/block/%s/dm/name", prefix, ptname);
+	if (!(f = fopen(path, "r" UL_CLOEXECSTR)))
+		return NULL;
+
+	/* read "<name>\n" from sysfs */
+	if (fgets(name, sizeof(name), f) && (sz = strlen(name)) > 1) {
+		name[sz - 1] = '\0';
+		snprintf(path, sizeof(path), _PATH_DEV_MAPPER "/%s", name);
+
+		if ((prefix && *prefix) || access(path, F_OK) == 0)
+			res = strdup(path);
+	}
+	fclose(f);
+	return res;
+}
+
+char *canonicalize_dm_name(const char *ptname)
+{
+	return __canonicalize_dm_name(NULL, ptname);
+}
+
+static int is_dm_devname(char *canonical, char **name)
+{
+	struct stat sb;
+	char *p = strrchr(canonical, '/');
+
+	*name = NULL;
+
+	if (!p
+	    || strncmp(p, "/dm-", 4) != 0
+	    || !isdigit(*(p + 4))
+	    || stat(canonical, &sb) != 0
+	    || !S_ISBLK(sb.st_mode))
+		return 0;
+
+	*name = p + 1;
+	return 1;
+}
+
+/*
+ * This function does not canonicalize the path! It just prepends CWD before a
+ * relative path. If the path is no relative than returns NULL. The path does
+ * not have to exist.
+ */
+char *absolute_path(const char *path)
+{
+	char cwd[PATH_MAX], *res, *p;
+	size_t psz, csz;
+
+	if (!is_relative_path(path)) {
+		errno = EINVAL;
+		return NULL;
+	}
+	if (!getcwd(cwd, sizeof(cwd)))
+		return NULL;
+
+	/* simple clean up */
+	if (startswith(path, "./"))
+		path += 2;
+	else if (strcmp(path, ".") == 0)
+		path = NULL;
+
+	if (!path || !*path)
+		return strdup(cwd);
+
+	csz = strlen(cwd);
+	psz = strlen(path);
+
+	p = res = malloc(csz + 1 + psz + 1);
+	if (!res)
+		return NULL;
+
+	p = mempcpy(p, cwd, csz);
+	*p++ = '/';
+	memcpy(p, path, psz + 1);
+
+	return res;
+}
+
+char *canonicalize_path(const char *path)
+{
+	char *canonical, *dmname;
+
+	if (!path || !*path)
+		return NULL;
+
+	canonical = realpath(path, NULL);
+	if (!canonical)
+		return strdup(path);
+
+	if (is_dm_devname(canonical, &dmname)) {
+		char *dm = canonicalize_dm_name(dmname);
+		if (dm) {
+			free(canonical);
+			return dm;
+		}
+	}
+
+	return canonical;
+}
+
+char *canonicalize_path_restricted(const char *path)
+{
+	char *canonical = NULL;
+	int errsv = 0;
+	int pipes[2];
+	ssize_t len;
+	pid_t pid;
+
+	if (!path || !*path)
+		return NULL;
+
+	if (pipe(pipes) != 0)
+		return NULL;
+
+	/*
+	 * To accurately assume identity of getuid() we must use setuid()
+	 * but if we do that, we lose ability to reassume euid of 0, so
+	 * we fork to do the check to keep euid intact.
+	 */
+	pid = fork();
+	switch (pid) {
+	case -1:
+		close(pipes[0]);
+		close(pipes[1]);
+		return NULL;			/* fork error */
+	case 0:
+		close(pipes[0]);		/* close unused end */
+		pipes[0] = -1;
+		errno = 0;
+
+		if (drop_permissions() != 0)
+			canonical = NULL;	/* failed */
+		else {
+			char *dmname = NULL;
+
+			canonical = realpath(path, NULL);
+			if (canonical && is_dm_devname(canonical, &dmname)) {
+				char *dm = canonicalize_dm_name(dmname);
+				if (dm) {
+					free(canonical);
+					canonical = dm;
+				}
+			}
+		}
+
+		len = canonical ? (ssize_t) strlen(canonical) :
+		          errno ? -errno : -EINVAL;
+
+		/* send length or errno */
+		write_all(pipes[1], (char *) &len, sizeof(len));
+		if (canonical)
+			write_all(pipes[1], canonical, len);
+		exit(0);
+	default:
+		break;
+	}
+
+	close(pipes[1]);		/* close unused end */
+	pipes[1] = -1;
+
+	/* read size or -errno */
+	if (read_all(pipes[0], (char *) &len, sizeof(len)) != sizeof(len))
+		goto done;
+	if (len < 0) {
+		errsv = -len;
+		goto done;
+	}
+
+	canonical = malloc(len + 1);
+	if (!canonical) {
+		errsv = ENOMEM;
+		goto done;
+	}
+	/* read path */
+	if (read_all(pipes[0], canonical, len) != len) {
+		errsv = errno;
+		goto done;
+	}
+	canonical[len] = '\0';
+done:
+	if (errsv) {
+		free(canonical);
+		canonical = NULL;
+	}
+	close(pipes[0]);
+
+	/* We make a best effort to reap child */
+	ignore_result( waitpid(pid, NULL, 0) );
+
+	errno = errsv;
+	return canonical;
+}
+
+
+#ifdef TEST_PROGRAM_CANONICALIZE
+int main(int argc, char **argv)
+{
+	if (argc < 2) {
+		fprintf(stderr, "usage: %s <device>\n", argv[0]);
+		exit(EXIT_FAILURE);
+	}
+
+	fprintf(stdout, "orig: %s\n", argv[1]);
+	fprintf(stdout, "real: %s\n", canonicalize_path(argv[1]));
+	exit(EXIT_SUCCESS);
+}
+#endif
diff --git a/lib/caputils.c b/lib/caputils.c
new file mode 100644
index 0000000..987533a
--- /dev/null
+++ b/lib/caputils.c
@@ -0,0 +1,118 @@
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <sys/prctl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>
+#include <errno.h>
+
+#include "c.h"
+#include "caputils.h"
+#include "pathnames.h"
+#include "procfs.h"
+
+static int test_cap(unsigned int cap)
+{
+	/* prctl returns 0 or 1 for valid caps, -1 otherwise */
+	return prctl(PR_CAPBSET_READ, cap, 0, 0, 0) >= 0;
+}
+
+static int cap_last_by_bsearch(int *ret)
+{
+	/* starting with cap=INT_MAX means we always know
+	 * that cap1 is invalid after the first iteration */
+	int cap = INT_MAX;
+	unsigned int cap0 = 0, cap1 = INT_MAX;
+
+	while ((int)cap0 < cap) {
+		if (test_cap(cap))
+			cap0 = cap;
+		else
+			cap1 = cap;
+
+		cap = (cap0 + cap1) / 2U;
+	}
+
+	*ret = cap;
+	return 0;
+}
+
+static int cap_last_by_procfs(int *ret)
+{
+	FILE *f = fopen(_PATH_PROC_CAPLASTCAP, "r");
+	int rc = -EINVAL;
+
+	*ret = 0;
+
+	if (f && fd_is_procfs(fileno(f))) {
+		int cap;
+
+		/* we check if the cap after this one really isn't valid */
+		if (fscanf(f, "%d", &cap) == 1 &&
+		    cap < INT_MAX && !test_cap(cap + 1)) {
+
+			*ret = cap;
+			rc = 0;
+		}
+	}
+
+	if (f)
+		fclose(f);
+	return rc;
+}
+
+int cap_last_cap(void)
+{
+	static int cap = -1;
+
+	if (cap != -1)
+		return cap;
+	if (cap_last_by_procfs(&cap) < 0)
+		cap_last_by_bsearch(&cap);
+
+	return cap;
+}
+
+#ifdef TEST_PROGRAM_CAPUTILS
+int main(int argc, char *argv[])
+{
+	int rc = 0, cap;
+
+	if (argc < 2) {
+		fprintf(stderr, "usage: %1$s --last-by-procfs\n"
+				"       %1$s --last-by-bsearch\n"
+				"       %1$s --last\n",
+				program_invocation_short_name);
+		return EXIT_FAILURE;
+	}
+
+	if (strcmp(argv[1], "--last-by-procfs") == 0) {
+		rc = cap_last_by_procfs(&cap);
+		if (rc == 0)
+			printf("last cap: %d\n", cap);
+
+	} else if (strcmp(argv[1], "--last-by-bsearch") == 0) {
+		rc = cap_last_by_bsearch(&cap);
+		if (rc == 0)
+			printf("last cap: %d\n", cap);
+
+	} else if (strcmp(argv[1], "--last") == 0)
+		printf("last cap: %d\n", cap_last_cap());
+
+	return rc == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
+}
+#endif
diff --git a/lib/color-names.c b/lib/color-names.c
new file mode 100644
index 0000000..fa5453c
--- /dev/null
+++ b/lib/color-names.c
@@ -0,0 +1,171 @@
+/*
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Copyright (C) 2012-2015 Karel Zak <kzak@redhat.com>
+ */
+#include "c.h"
+#include "color-names.h"
+
+#include <ctype.h>
+
+struct ul_color_name {
+	const char *name;
+	const char *seq;
+};
+
+/*
+ * qsort/bsearch buddy
+ */
+static int cmp_color_name(const void *a0, const void *b0)
+{
+	const struct ul_color_name
+		*a = (const struct ul_color_name *) a0,
+		*b = (const struct ul_color_name *) b0;
+	return strcmp(a->name, b->name);
+}
+
+/*
+ * Maintains human readable color names
+ */
+const char *color_sequence_from_colorname(const char *str)
+{
+	static const struct ul_color_name basic_schemes[] = {
+		{ "black",	UL_COLOR_BLACK           },
+		{ "blink",      UL_COLOR_BLINK           },
+		{ "blue",	UL_COLOR_BLUE            },
+		{ "bold",       UL_COLOR_BOLD		 },
+		{ "brown",	UL_COLOR_BROWN           },
+		{ "cyan",	UL_COLOR_CYAN            },
+		{ "darkgray",	UL_COLOR_DARK_GRAY       },
+		{ "gray",	UL_COLOR_GRAY            },
+		{ "green",	UL_COLOR_GREEN           },
+		{ "halfbright", UL_COLOR_HALFBRIGHT	 },
+		{ "lightblue",	UL_COLOR_BOLD_BLUE       },
+		{ "lightcyan",	UL_COLOR_BOLD_CYAN       },
+		{ "lightgray,",	UL_COLOR_GRAY            },
+		{ "lightgreen", UL_COLOR_BOLD_GREEN      },
+		{ "lightmagenta", UL_COLOR_BOLD_MAGENTA  },
+		{ "lightred",	UL_COLOR_BOLD_RED        },
+		{ "magenta",	UL_COLOR_MAGENTA         },
+		{ "red",	UL_COLOR_RED             },
+		{ "reset",      UL_COLOR_RESET,          },
+		{ "reverse",    UL_COLOR_REVERSE         },
+		{ "yellow",	UL_COLOR_BOLD_YELLOW     },
+		{ "white",      UL_COLOR_WHITE           }
+	};
+	struct ul_color_name key = { .name = str }, *res;
+
+	if (!str)
+		return NULL;
+
+	res = bsearch(&key, basic_schemes, ARRAY_SIZE(basic_schemes),
+				sizeof(struct ul_color_name),
+				cmp_color_name);
+	return res ? res->seq : NULL;
+}
+
+
+int color_is_sequence(const char *color)
+{
+	if (color && *color == 0x1B) {
+		size_t len = strlen(color);
+
+		if (len >= 4 &&
+		    *(color + 1) == '[' &&
+		    isdigit(*(color + 2)) &&
+		    *(color + len - 1) == 'm')
+		return 1;
+	}
+
+	return 0;
+}
+
+/* canonicalize sequence */
+static int __color_canonicalize(const char *str, char **seq)
+{
+	char *in, *out;
+	int len;
+
+	if (!str)
+		return -EINVAL;
+
+	*seq = NULL;
+
+	/* convert color names like "red" to the real sequence */
+	if (*str != '\\' && isalpha(*str)) {
+		const char *s = color_sequence_from_colorname(str);
+		*seq = strdup(s ? s : str);
+
+		return *seq ? 0 : -ENOMEM;
+	}
+
+	/* convert xx;yy sequences to "\033[xx;yy" */
+	if ((len = asprintf(seq, "\033[%sm", str)) < 1)
+		return -ENOMEM;
+
+	for (in = *seq, out = *seq; in && *in; in++) {
+		if (*in != '\\') {
+			*out++ = *in;
+			continue;
+		}
+		switch(*(in + 1)) {
+		case 'a':
+			*out++ = '\a';	/* Bell */
+			break;
+		case 'b':
+			*out++ = '\b';	/* Backspace */
+			break;
+		case 'e':
+			*out++ = '\033';	/* Escape */
+			break;
+		case 'f':
+			*out++ = '\f';	/* Form Feed */
+			break;
+		case 'n':
+			*out++ = '\n';	/* Newline */
+			break;
+		case 'r':
+			*out++ = '\r';	/* Carriage Return */
+			break;
+		case 't':
+			*out++ = '\t';	/* Tab */
+			break;
+		case 'v':
+			*out++ = '\v';	/* Vertical Tab */
+			break;
+		case '\\':
+			*out++ = '\\';	/* Backslash */
+			break;
+		case '_':
+			*out++ = ' ';	/* Space */
+			break;
+		case '#':
+			*out++ = '#';	/* Hash mark */
+			break;
+		case '?':
+			*out++ = '?';	/* Question mark */
+			break;
+		default:
+			*out++ = *in;
+			*out++ = *(in + 1);
+			break;
+		}
+		in++;
+	}
+
+	if (out) {
+		assert ((out - *seq) <= len);
+		*out = '\0';
+	}
+
+	return 0;
+}
+
+char *color_get_sequence(const char *color)
+{
+	char *seq = NULL;
+	int rc = __color_canonicalize(color, &seq);
+
+	return rc ? NULL : seq;
+}
diff --git a/lib/colors.c b/lib/colors.c
new file mode 100644
index 0000000..532e339
--- /dev/null
+++ b/lib/colors.c
@@ -0,0 +1,826 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * Copyright (C) 2012 Ondrej Oprala <ooprala@redhat.com>
+ * Copyright (C) 2012-2014 Karel Zak <kzak@redhat.com>
+ *
+ * This file may be distributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+#include <assert.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <ctype.h>
+
+#if defined(HAVE_LIBNCURSES) || defined(HAVE_LIBNCURSESW)
+# if defined(HAVE_NCURSESW_NCURSES_H)
+#  include <ncursesw/ncurses.h>
+# elif defined(HAVE_NCURSES_NCURSES_H)
+#  include <ncurses/ncurses.h>
+# elif defined(HAVE_NCURSES_H)
+#  include <ncurses.h>
+# endif
+# if defined(HAVE_NCURSESW_TERM_H)
+#  include <ncursesw/term.h>
+# elif defined(HAVE_NCURSES_TERM_H)
+#  include <ncurses/term.h>
+# elif defined(HAVE_TERM_H)
+#  include <term.h>
+# endif
+#endif
+
+#include "c.h"
+#include "colors.h"
+#include "pathnames.h"
+#include "strutils.h"
+
+#include "debug.h"
+
+/*
+ * Default behavior, may be overridden by terminal-colors.d/{enable,disable}.
+ */
+#ifdef USE_COLORS_BY_DEFAULT
+# define UL_COLORMODE_DEFAULT	UL_COLORMODE_AUTO	/* check isatty() */
+#else
+# define UL_COLORMODE_DEFAULT	UL_COLORMODE_NEVER	/* no colors by default */
+#endif
+
+/*
+ * terminal-colors.d debug stuff
+ */
+static UL_DEBUG_DEFINE_MASK(termcolors);
+UL_DEBUG_DEFINE_MASKNAMES(termcolors) = UL_DEBUG_EMPTY_MASKNAMES;
+
+#define TERMCOLORS_DEBUG_INIT	(1 << 1)
+#define TERMCOLORS_DEBUG_CONF	(1 << 2)
+#define TERMCOLORS_DEBUG_SCHEME	(1 << 3)
+#define TERMCOLORS_DEBUG_ALL	0xFFFF
+
+#define DBG(m, x)       __UL_DBG(termcolors, TERMCOLORS_DEBUG_, m, x)
+#define ON_DBG(m, x)    __UL_DBG_CALL(termcolors, TERMCOLORS_DEBUG_, m, x)
+
+/*
+ * terminal-colors.d file types
+ */
+enum {
+	UL_COLORFILE_DISABLE,		/* .disable */
+	UL_COLORFILE_ENABLE,		/* .enable */
+	UL_COLORFILE_SCHEME,		/* .scheme */
+
+	__UL_COLORFILE_COUNT
+};
+
+struct ul_color_scheme {
+	char *name;
+	char *seq;
+};
+
+/*
+ * Global colors control struct
+ *
+ * The terminal-colors.d/ evaluation is based on "scores":
+ *
+ *  filename                    score
+ *  ---------------------------------------
+ *  type			1
+ *  @termname.type		10 + 1
+ *  utilname.type		20 + 1
+ *  utilname@termname.type	20 + 10 + 1
+ *
+ * the match with higher score wins. The score is per type.
+ */
+struct ul_color_ctl {
+	const char	*utilname;	/* util name */
+	const char	*termname;	/* terminal name ($TERM) */
+
+	char		*sfile;	/* path to scheme */
+
+	struct ul_color_scheme	*schemes;	/* array with color schemes */
+	size_t			nschemes;	/* number of the items */
+	size_t			schemes_sz;	/* number of the allocated items */
+
+	int		mode;		/* UL_COLORMODE_* */
+	unsigned int	has_colors : 1,	/* based on mode and scores[] */
+			disabled   : 1, /* disable colors */
+			cs_configured : 1, /* color schemes read */
+			configured : 1; /* terminal-colors.d parsed */
+
+	int		scores[__UL_COLORFILE_COUNT];	/* the best match */
+};
+
+/*
+ * Control struct, globally shared.
+ */
+static struct ul_color_ctl ul_colors;
+
+static void colors_free_schemes(struct ul_color_ctl *cc);
+static int colors_read_schemes(struct ul_color_ctl *cc);
+
+/*
+ * qsort/bsearch buddy
+ */
+static int cmp_scheme_name(const void *a0, const void *b0)
+{
+	const struct ul_color_scheme *a = (const struct ul_color_scheme *) a0,
+				     *b = (const struct ul_color_scheme *) b0;
+	return strcmp(a->name, b->name);
+}
+
+/*
+ * Resets control struct (note that we don't allocate the struct)
+ */
+static void colors_reset(struct ul_color_ctl *cc)
+{
+	if (!cc)
+		return;
+
+	colors_free_schemes(cc);
+
+	free(cc->sfile);
+
+	cc->sfile = NULL;
+	cc->utilname = NULL;
+	cc->termname = NULL;
+	cc->mode = UL_COLORMODE_UNDEF;
+
+	memset(cc->scores, 0, sizeof(cc->scores));
+}
+
+static void colors_debug(struct ul_color_ctl *cc)
+{
+	size_t i;
+
+	if (!cc)
+		return;
+
+	printf("Colors:\n");
+	printf("\tutilname = '%s'\n", cc->utilname);
+	printf("\ttermname = '%s'\n", cc->termname);
+	printf("\tscheme file = '%s'\n", cc->sfile);
+	printf("\tmode = %s\n",
+			cc->mode == UL_COLORMODE_UNDEF ? "undefined" :
+			cc->mode == UL_COLORMODE_AUTO ?  "auto" :
+			cc->mode == UL_COLORMODE_NEVER ? "never" :
+			cc->mode == UL_COLORMODE_ALWAYS ? "always" : "???");
+	printf("\thas_colors = %d\n", cc->has_colors);
+	printf("\tdisabled = %d\n", cc->disabled);
+	printf("\tconfigured = %d\n", cc->configured);
+	printf("\tcs configured = %d\n", cc->cs_configured);
+
+	fputc('\n', stdout);
+
+	for (i = 0; i < ARRAY_SIZE(cc->scores); i++)
+		printf("\tscore %s = %d\n",
+				i == UL_COLORFILE_DISABLE ? "disable" :
+				i == UL_COLORFILE_ENABLE ? "enable" :
+				i == UL_COLORFILE_SCHEME ? "scheme" : "???",
+				cc->scores[i]);
+
+	fputc('\n', stdout);
+
+	for (i = 0; i < cc->nschemes; i++) {
+		printf("\tscheme #%02zu ", i);
+		color_scheme_enable(cc->schemes[i].name, NULL);
+		fputs(cc->schemes[i].name, stdout);
+		color_disable();
+		fputc('\n', stdout);
+	}
+	fputc('\n', stdout);
+}
+
+/*
+ * Parses [[<utilname>][@<termname>].]<type>
+ */
+static int filename_to_tokens(const char *str,
+			      const char **name, size_t *namesz,
+			      const char **term, size_t *termsz,
+			      int  *filetype)
+{
+	const char *type_start, *term_start, *p;
+
+	if (!str || !*str || *str == '.' || strlen(str) > PATH_MAX)
+		return -EINVAL;
+
+	/* parse .type */
+	p = strrchr(str, '.');
+	type_start = p ? p + 1 : str;
+
+	if (strcmp(type_start, "disable") == 0)
+		*filetype = UL_COLORFILE_DISABLE;
+	else if (strcmp(type_start, "enable") == 0)
+		*filetype = UL_COLORFILE_ENABLE;
+	else if (strcmp(type_start, "scheme") == 0)
+		*filetype = UL_COLORFILE_SCHEME;
+	else {
+		DBG(CONF, ul_debug("unknown type '%s'", type_start));
+		return 1;				/* unknown type */
+	}
+
+	if (type_start == str)
+		return 0;				/* "type" only */
+
+	/* parse @termname */
+	p = strchr(str, '@');
+	term_start = p ? p + 1 : NULL;
+	if (term_start) {
+		*term = term_start;
+		*termsz = type_start - term_start - 1;
+		if (term_start - 1 == str)
+			return 0;			/* "@termname.type" */
+	}
+
+	/* parse utilname */
+	p = term_start ? term_start : type_start;
+	*name = str;
+	*namesz = p - str - 1;
+
+	return 0;
+}
+
+/*
+ * Scans @dirname and select the best matches for UL_COLORFILE_* types.
+ * The result is stored to cc->scores. The path to the best "scheme"
+ * file is stored to cc->scheme.
+ */
+static int colors_readdir(struct ul_color_ctl *cc, const char *dirname)
+{
+	DIR *dir;
+	int rc = 0;
+	struct dirent *d;
+	char sfile[PATH_MAX] = { '\0' };
+	size_t namesz, termsz;
+
+	if (!dirname || !cc || !cc->utilname || !*cc->utilname)
+		return -EINVAL;
+
+	DBG(CONF, ul_debug("reading dir: '%s'", dirname));
+
+	dir = opendir(dirname);
+	if (!dir)
+		return -errno;
+
+	namesz = strlen(cc->utilname);
+	termsz = cc->termname ? strlen(cc->termname) : 0;
+
+	while ((d = readdir(dir))) {
+		int type, score = 1;
+		const char *tk_name = NULL, *tk_term = NULL;
+		size_t tk_namesz = 0, tk_termsz = 0;
+
+		if (*d->d_name == '.')
+			continue;
+#ifdef _DIRENT_HAVE_D_TYPE
+		if (d->d_type != DT_UNKNOWN && d->d_type != DT_LNK &&
+		    d->d_type != DT_REG)
+			continue;
+#endif
+		if (filename_to_tokens(d->d_name,
+				       &tk_name, &tk_namesz,
+				       &tk_term, &tk_termsz, &type) != 0)
+			continue;
+
+		/* count theoretical score before we check names to avoid
+		 * unnecessary strcmp() */
+		if (tk_name)
+			score += 20;
+		if (tk_term)
+			score += 10;
+
+		DBG(CONF, ul_debug("item '%s': score=%d "
+			"[cur: %d, name(%zu): %s, term(%zu): %s]",
+			d->d_name, score, cc->scores[type],
+			tk_namesz, tk_name,
+			tk_termsz, tk_term));
+
+
+		if (score < cc->scores[type])
+			continue;
+
+		/* filter out by names */
+		if (tk_namesz && (tk_namesz != namesz ||
+				 strncmp(tk_name, cc->utilname, namesz) != 0))
+			continue;
+
+		if (tk_termsz && (termsz == 0 || tk_termsz != termsz ||
+				  strncmp(tk_term, cc->termname, termsz) != 0))
+			continue;
+
+		DBG(CONF, ul_debug("setting '%s' from %d -to-> %d",
+					type == UL_COLORFILE_SCHEME ? "scheme" :
+					type == UL_COLORFILE_DISABLE ? "disable" :
+					type == UL_COLORFILE_ENABLE ? "enable" : "???",
+					cc->scores[type], score));
+		cc->scores[type] = score;
+		if (type == UL_COLORFILE_SCHEME)
+			strncpy(sfile, d->d_name, sizeof(sfile));
+	}
+
+	if (*sfile) {
+		sfile[sizeof(sfile) - 1] = '\0';
+		if (asprintf(&cc->sfile, "%s/%s", dirname, sfile) <= 0)
+			rc = -ENOMEM;
+	} else {
+		rc = -ENOENT;
+	}
+
+	closedir(dir);
+	return rc;
+}
+
+/* atexit() wrapper */
+static void colors_deinit(void)
+{
+	colors_reset(&ul_colors);
+}
+
+/*
+ * Returns path to $XDG_CONFIG_HOME/terminal-colors.d
+ */
+static char *colors_get_homedir(char *buf, size_t bufsz)
+{
+	char *p = getenv("XDG_CONFIG_HOME");
+
+	if (p) {
+		snprintf(buf, bufsz, "%s/" _PATH_TERMCOLORS_DIRNAME, p);
+		return buf;
+	}
+
+	p = getenv("HOME");
+	if (p) {
+		snprintf(buf, bufsz, "%s/.config/" _PATH_TERMCOLORS_DIRNAME, p);
+		return buf;
+	}
+
+	return NULL;
+}
+
+/*
+ * Adds one color sequence to array with color scheme.
+ * When returning success (0) this function takes ownership of
+ * @seq and @name, which have to be allocated strings.
+ */
+static int colors_add_scheme(struct ul_color_ctl *cc,
+			     char *name,
+			     char *seq0)
+{
+	struct ul_color_scheme *cs = NULL;
+	char *seq = NULL;
+	int rc;
+
+	if (!cc || !name || !*name || !seq0 || !*seq0)
+		return -EINVAL;
+
+	DBG(SCHEME, ul_debug("add '%s'", name));
+
+	seq = color_get_sequence(seq0);
+	if (!seq)
+		return -EINVAL;
+	rc = -ENOMEM;
+
+	/* enlarge the array */
+	if (cc->nschemes == cc->schemes_sz) {
+		void *tmp = realloc(cc->schemes, (cc->nschemes + 10)
+					* sizeof(struct ul_color_scheme));
+		if (!tmp)
+			goto err;
+		cc->schemes = tmp;
+		cc->schemes_sz = cc->nschemes + 10;
+	}
+
+	/* add a new item */
+	cs = &cc->schemes[cc->nschemes];
+	cs->seq = seq;
+	cs->name = strdup(name);
+	if (!cs->name)
+		goto err;
+
+	cc->nschemes++;
+	return 0;
+err:
+	if (cs) {
+		free(cs->seq);
+		free(cs->name);
+		cs->seq = cs->name = NULL;
+	} else
+		free(seq);
+	return rc;
+}
+
+/*
+ * Deallocates all regards to color schemes
+ */
+static void colors_free_schemes(struct ul_color_ctl *cc)
+{
+	size_t i;
+
+	DBG(SCHEME, ul_debug("free scheme"));
+
+	for (i = 0; i < cc->nschemes; i++) {
+		free(cc->schemes[i].name);
+		free(cc->schemes[i].seq);
+	}
+
+	free(cc->schemes);
+	cc->schemes = NULL;
+	cc->nschemes = 0;
+	cc->schemes_sz = 0;
+}
+
+/*
+ * The scheme configuration has to be sorted for bsearch
+ */
+static void colors_sort_schemes(struct ul_color_ctl *cc)
+{
+	if (!cc->nschemes)
+		return;
+
+	DBG(SCHEME, ul_debug("sort scheme"));
+
+	qsort(cc->schemes, cc->nschemes,
+	      sizeof(struct ul_color_scheme), cmp_scheme_name);
+}
+
+/*
+ * Returns just one color scheme
+ */
+static struct ul_color_scheme *colors_get_scheme(struct ul_color_ctl *cc,
+						 const char *name)
+{
+	struct ul_color_scheme key = { .name = (char *) name}, *res;
+
+	if (!cc || !name || !*name)
+		return NULL;
+
+	if (!cc->cs_configured) {
+		int rc = colors_read_schemes(cc);
+		if (rc)
+			return NULL;
+	}
+	if (!cc->nschemes)
+		return NULL;
+
+	DBG(SCHEME, ul_debug("search '%s'", name));
+
+	res = bsearch(&key, cc->schemes, cc->nschemes,
+				sizeof(struct ul_color_scheme),
+				cmp_scheme_name);
+
+	return res && res->seq ? res  : NULL;
+}
+
+/*
+ * Parses filenames in terminal-colors.d
+ */
+static int colors_read_configuration(struct ul_color_ctl *cc)
+{
+	int rc = -ENOENT;
+	char *dirname, buf[PATH_MAX];
+
+	cc->termname = getenv("TERM");
+
+	dirname = colors_get_homedir(buf, sizeof(buf));
+	if (dirname)
+		rc = colors_readdir(cc, dirname);		/* ~/.config */
+	if (rc == -EPERM || rc == -EACCES || rc == -ENOENT)
+		rc = colors_readdir(cc, _PATH_TERMCOLORS_DIR);	/* /etc */
+
+	cc->configured = 1;
+	return rc;
+}
+
+/*
+ * Reads terminal-colors.d/ scheme file into array schemes
+ */
+static int colors_read_schemes(struct ul_color_ctl *cc)
+{
+	int rc = 0;
+	FILE *f = NULL;
+	char buf[BUFSIZ],
+	     cn[129], seq[129];
+
+	if (!cc->configured)
+		rc = colors_read_configuration(cc);
+
+	cc->cs_configured = 1;
+
+	if (rc || !cc->sfile)
+		goto done;
+
+	DBG(SCHEME, ul_debug("reading file '%s'", cc->sfile));
+
+	f = fopen(cc->sfile, "r");
+	if (!f) {
+		rc = -errno;
+		goto done;
+	}
+
+	while (fgets(buf, sizeof(buf), f)) {
+		char *p = strchr(buf, '\n');
+
+		if (!p) {
+			if (feof(f))
+				p = strchr(buf, '\0');
+			else {
+				rc = -errno;
+				goto done;
+			}
+		}
+		*p = '\0';
+		p = (char *) skip_blank(buf);
+		if (*p == '\0' || *p == '#')
+			continue;
+
+		rc = sscanf(p, "%128[^ ] %128[^\n ]", cn, seq);
+		if (rc == 2 && *cn && *seq) {
+			rc = colors_add_scheme(cc, cn, seq);	/* set rc=0 on success */
+			if (rc)
+				goto done;
+		}
+	}
+	rc = 0;
+
+done:
+	if (f)
+		fclose(f);
+	colors_sort_schemes(cc);
+
+	return rc;
+}
+
+
+static void termcolors_init_debug(void)
+{
+	__UL_INIT_DEBUG_FROM_ENV(termcolors, TERMCOLORS_DEBUG_, 0, TERMINAL_COLORS_DEBUG);
+}
+
+static int colors_terminal_is_ready(void)
+{
+	int ncolors = -1;
+
+#if defined(HAVE_LIBNCURSES) || defined(HAVE_LIBNCURSESW)
+	{
+		int ret;
+
+		if (setupterm(NULL, STDOUT_FILENO, &ret) == 0 && ret == 1)
+			ncolors = tigetnum("colors");
+	}
+#endif
+	if (1 < ncolors) {
+		DBG(CONF, ul_debug("terminal is ready (supports %d colors)", ncolors));
+		return 1;
+	}
+
+	DBG(CONF, ul_debug("terminal is NOT ready (no colors)"));
+	return 0;
+}
+
+/**
+ * colors_init:
+ * @mode: UL_COLORMODE_*
+ * @name: util argv[0]
+ *
+ * Initialize private color control struct and initialize the colors
+ * status. The color schemes are parsed on demand by colors_get_scheme().
+ *
+ * Returns: >0 on success.
+ */
+int colors_init(int mode, const char *name)
+{
+	int ready = -1;
+	struct ul_color_ctl *cc = &ul_colors;
+
+	cc->utilname = name;
+
+	termcolors_init_debug();
+
+	if (mode != UL_COLORMODE_ALWAYS && !isatty(STDOUT_FILENO))
+		cc->mode = UL_COLORMODE_NEVER;
+	else
+		cc->mode = mode;
+
+	if (cc->mode == UL_COLORMODE_UNDEF
+	    && (ready = colors_terminal_is_ready())) {
+		int rc = colors_read_configuration(cc);
+		if (rc)
+			cc->mode = UL_COLORMODE_DEFAULT;
+		else {
+
+			/* evaluate scores */
+			if (cc->scores[UL_COLORFILE_DISABLE] >
+			    cc->scores[UL_COLORFILE_ENABLE])
+				cc->mode = UL_COLORMODE_NEVER;
+			else
+				cc->mode = UL_COLORMODE_DEFAULT;
+
+			atexit(colors_deinit);
+		}
+	}
+
+	switch (cc->mode) {
+	case UL_COLORMODE_AUTO:
+		cc->has_colors = ready == -1 ? colors_terminal_is_ready() : ready;
+		break;
+	case UL_COLORMODE_ALWAYS:
+		cc->has_colors = 1;
+		break;
+	case UL_COLORMODE_NEVER:
+	default:
+		cc->has_colors = 0;
+	}
+
+	ON_DBG(CONF, colors_debug(cc));
+
+	return cc->has_colors;
+}
+
+/*
+ * Temporary disable colors (this setting is independent on terminal-colors.d/)
+ */
+void colors_off(void)
+{
+	ul_colors.disabled = 1;
+}
+
+/*
+ * Enable colors
+ */
+void colors_on(void)
+{
+	ul_colors.disabled = 0;
+}
+
+/*
+ * Is terminal-colors.d/ configured to use colors?
+ */
+int colors_wanted(void)
+{
+	return ul_colors.has_colors;
+}
+
+/*
+ * Returns mode
+ */
+int colors_mode(void)
+{
+	return ul_colors.mode;
+}
+
+/*
+ * Enable @seq color
+ */
+void color_fenable(const char *seq, FILE *f)
+{
+	if (!ul_colors.disabled && ul_colors.has_colors && seq)
+		fputs(seq, f);
+}
+
+/*
+ * Returns escape sequence by logical @name, if undefined then returns @dflt.
+ */
+const char *color_scheme_get_sequence(const char *name, const char *dflt)
+{
+	struct ul_color_scheme *cs;
+
+	if (ul_colors.disabled || !ul_colors.has_colors)
+		return NULL;
+
+	cs = colors_get_scheme(&ul_colors, name);
+	return cs && cs->seq ? cs->seq : dflt;
+}
+
+/*
+ * Enable color by logical @name, if undefined enable @dflt.
+ */
+void color_scheme_fenable(const char *name, const char *dflt, FILE *f)
+{
+	const char *seq = color_scheme_get_sequence(name, dflt);
+
+	if (!seq)
+		return;
+	color_fenable(seq, f);
+}
+
+
+/*
+ * Disable previously enabled color
+ */
+void color_fdisable(FILE *f)
+{
+	if (!ul_colors.disabled && ul_colors.has_colors)
+		fputs(UL_COLOR_RESET, f);
+}
+
+/*
+ * Get reset sequence
+ */
+const char *color_get_disable_sequence(void)
+{
+	if (!ul_colors.disabled && ul_colors.has_colors)
+		return UL_COLOR_RESET;
+	else
+		return "";
+}
+
+/*
+ * Parses @str to return UL_COLORMODE_*
+ */
+int colormode_from_string(const char *str)
+{
+	size_t i;
+	static const char *modes[] = {
+		[UL_COLORMODE_AUTO]   = "auto",
+		[UL_COLORMODE_NEVER]  = "never",
+		[UL_COLORMODE_ALWAYS] = "always",
+		[UL_COLORMODE_UNDEF] = ""
+	};
+
+	if (!str || !*str)
+		return -EINVAL;
+
+	assert(ARRAY_SIZE(modes) == __UL_NCOLORMODES);
+
+	for (i = 0; i < ARRAY_SIZE(modes); i++) {
+		if (strcasecmp(str, modes[i]) == 0)
+			return i;
+	}
+
+	return -EINVAL;
+}
+
+/*
+ * Parses @str and exit(EXIT_FAILURE) on error
+ */
+int colormode_or_err(const char *str, const char *errmsg)
+{
+	const char *p = str && *str == '=' ? str + 1 : str;
+	int colormode;
+
+	colormode = colormode_from_string(p);
+	if (colormode < 0)
+		errx(EXIT_FAILURE, "%s: '%s'", errmsg, p);
+
+	return colormode;
+}
+
+#ifdef TEST_PROGRAM_COLORS
+# include <getopt.h>
+int main(int argc, char *argv[])
+{
+	static const struct option longopts[] = {
+		{ "mode",	required_argument, NULL, 'm' },
+		{ "color",	required_argument, NULL, 'c' },
+		{ "color-scheme", required_argument, NULL, 'C' },
+		{ "name",	required_argument, NULL, 'n' },
+		{ NULL, 0, NULL, 0 }
+	};
+	int c, mode = UL_COLORMODE_UNDEF;	/* default */
+	const char *color = "red", *name = NULL, *color_scheme = NULL;
+	char *seq = NULL;
+
+	while ((c = getopt_long(argc, argv, "C:c:m:n:", longopts, NULL)) != -1) {
+		switch (c) {
+		case 'c':
+			color = optarg;
+			break;
+		case 'C':
+			color_scheme = optarg;
+			break;
+		case 'm':
+			mode = colormode_or_err(optarg, "unsupported color mode");
+			break;
+		case 'n':
+			name = optarg;
+			break;
+		default:
+			fprintf(stderr, "usage: %s [options]\n"
+			" -m, --mode <auto|never|always>  default is undefined\n"
+			" -c, --color <red|blue|...>      color for the test message\n"
+			" -C, --color-scheme <name>       color for the test message\n"
+			" -n, --name <utilname>           util name\n",
+			program_invocation_short_name);
+			return EXIT_FAILURE;
+		}
+	}
+
+	colors_init(mode, name ? name : program_invocation_short_name);
+
+	if (color_is_sequence(color))
+		seq = strdup(color);
+	else
+		seq = color_get_sequence(color);
+
+	if (color_scheme)
+		color_scheme_enable(color_scheme, seq);
+	else
+		color_enable(seq);
+	printf("Hello World!");
+	color_disable();
+	fputc('\n', stdout);
+
+	free(seq);
+
+	return EXIT_SUCCESS;
+}
+#endif /* TEST_PROGRAM_COLORS */
+
diff --git a/lib/cpuset.c b/lib/cpuset.c
new file mode 100644
index 0000000..098b8e5
--- /dev/null
+++ b/lib/cpuset.c
@@ -0,0 +1,417 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * Terminology:
+ *
+ *	cpuset	- (libc) cpu_set_t data structure represents set of CPUs
+ *	cpumask	- string with hex mask (e.g. "0x00000001")
+ *	cpulist - string with CPU ranges (e.g. "0-3,5,7,8")
+ *
+ * Based on code from taskset.c and Linux kernel.
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ *
+ * Copyright (C) 2010 Karel Zak <kzak@redhat.com>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sched.h>
+#include <errno.h>
+#include <string.h>
+#include <ctype.h>
+#ifdef HAVE_SYS_SYSCALL_H
+#include <sys/syscall.h>
+#endif
+
+#include "cpuset.h"
+#include "c.h"
+
+static inline int val_to_char(int v)
+{
+	if (v >= 0 && v < 10)
+		return '0' + v;
+	if (v >= 10 && v < 16)
+		return ('a' - 10) + v;
+	return -1;
+}
+
+static inline int char_to_val(int c)
+{
+	int cl;
+
+	if (c >= '0' && c <= '9')
+		return c - '0';
+	cl = tolower(c);
+	if (cl >= 'a' && cl <= 'f')
+		return cl + (10 - 'a');
+	return -1;
+}
+
+static const char *nexttoken(const char *q,  int sep)
+{
+	if (q)
+		q = strchr(q, sep);
+	if (q)
+		q++;
+	return q;
+}
+
+/*
+ * Number of bits in a CPU bitmask on current system
+ */
+int get_max_number_of_cpus(void)
+{
+#ifdef SYS_sched_getaffinity
+	int n, cpus = 2048;
+	size_t setsize;
+	cpu_set_t *set = cpuset_alloc(cpus, &setsize, NULL);
+
+	if (!set)
+		return -1;	/* error */
+
+	for (;;) {
+		CPU_ZERO_S(setsize, set);
+
+		/* the library version does not return size of cpumask_t */
+		n = syscall(SYS_sched_getaffinity, 0, setsize, set);
+
+		if (n < 0 && errno == EINVAL && cpus < 1024 * 1024) {
+			cpuset_free(set);
+			cpus *= 2;
+			set = cpuset_alloc(cpus, &setsize, NULL);
+			if (!set)
+				return -1;	/* error */
+			continue;
+		}
+		cpuset_free(set);
+		return n * 8;
+	}
+#endif
+	return -1;
+}
+
+/*
+ * Allocates a new set for ncpus and returns size in bytes and size in bits
+ */
+cpu_set_t *cpuset_alloc(int ncpus, size_t *setsize, size_t *nbits)
+{
+	cpu_set_t *set = CPU_ALLOC(ncpus);
+
+	if (!set)
+		return NULL;
+	if (setsize)
+		*setsize = CPU_ALLOC_SIZE(ncpus);
+	if (nbits)
+		*nbits = cpuset_nbits(CPU_ALLOC_SIZE(ncpus));
+	return set;
+}
+
+void cpuset_free(cpu_set_t *set)
+{
+	CPU_FREE(set);
+}
+
+#if !HAVE_DECL_CPU_ALLOC
+/* Please, use CPU_COUNT_S() macro. This is fallback */
+int __cpuset_count_s(size_t setsize, const cpu_set_t *set)
+{
+	int s = 0;
+	const __cpu_mask *p = set->__bits;
+	const __cpu_mask *end = &set->__bits[setsize / sizeof (__cpu_mask)];
+
+	while (p < end) {
+		__cpu_mask l = *p++;
+
+		if (l == 0)
+			continue;
+# if LONG_BIT > 32
+		l = (l & 0x5555555555555555ul) + ((l >> 1) & 0x5555555555555555ul);
+		l = (l & 0x3333333333333333ul) + ((l >> 2) & 0x3333333333333333ul);
+		l = (l & 0x0f0f0f0f0f0f0f0ful) + ((l >> 4) & 0x0f0f0f0f0f0f0f0ful);
+		l = (l & 0x00ff00ff00ff00fful) + ((l >> 8) & 0x00ff00ff00ff00fful);
+		l = (l & 0x0000ffff0000fffful) + ((l >> 16) & 0x0000ffff0000fffful);
+		l = (l & 0x00000000fffffffful) + ((l >> 32) & 0x00000000fffffffful);
+# else
+		l = (l & 0x55555555ul) + ((l >> 1) & 0x55555555ul);
+		l = (l & 0x33333333ul) + ((l >> 2) & 0x33333333ul);
+		l = (l & 0x0f0f0f0ful) + ((l >> 4) & 0x0f0f0f0ful);
+		l = (l & 0x00ff00fful) + ((l >> 8) & 0x00ff00fful);
+		l = (l & 0x0000fffful) + ((l >> 16) & 0x0000fffful);
+# endif
+		s += l;
+	}
+	return s;
+}
+#endif
+
+/*
+ * Returns human readable representation of the cpuset. The output format is
+ * a list of CPUs with ranges (for example, "0,1,3-9").
+ */
+char *cpulist_create(char *str, size_t len,
+			cpu_set_t *set, size_t setsize)
+{
+	size_t i;
+	char *ptr = str;
+	int entry_made = 0;
+	size_t max = cpuset_nbits(setsize);
+
+	for (i = 0; i < max; i++) {
+		if (CPU_ISSET_S(i, setsize, set)) {
+			int rlen;
+			size_t j, run = 0;
+			entry_made = 1;
+			for (j = i + 1; j < max; j++) {
+				if (CPU_ISSET_S(j, setsize, set))
+					run++;
+				else
+					break;
+			}
+			if (!run)
+				rlen = snprintf(ptr, len, "%zu,", i);
+			else if (run == 1) {
+				rlen = snprintf(ptr, len, "%zu,%zu,", i, i + 1);
+				i++;
+			} else {
+				rlen = snprintf(ptr, len, "%zu-%zu,", i, i + run);
+				i += run;
+			}
+			if (rlen < 0 || (size_t) rlen >= len)
+				return NULL;
+			ptr += rlen;
+			len -= rlen;
+		}
+	}
+	ptr -= entry_made;
+	*ptr = '\0';
+
+	return str;
+}
+
+/*
+ * Returns string with CPU mask.
+ */
+char *cpumask_create(char *str, size_t len,
+			cpu_set_t *set, size_t setsize)
+{
+	char *ptr = str;
+	char *ret = NULL;
+	int cpu;
+
+	for (cpu = cpuset_nbits(setsize) - 4; cpu >= 0; cpu -= 4) {
+		char val = 0;
+
+		if (len == (size_t) (ptr - str))
+			break;
+
+		if (CPU_ISSET_S(cpu, setsize, set))
+			val |= 1;
+		if (CPU_ISSET_S(cpu + 1, setsize, set))
+			val |= 2;
+		if (CPU_ISSET_S(cpu + 2, setsize, set))
+			val |= 4;
+		if (CPU_ISSET_S(cpu + 3, setsize, set))
+			val |= 8;
+
+		if (!ret && val)
+			ret = ptr;
+		*ptr++ = val_to_char(val);
+	}
+	*ptr = '\0';
+	return ret ? ret : ptr - 1;
+}
+
+/*
+ * Parses string with CPUs mask.
+ */
+int cpumask_parse(const char *str, cpu_set_t *set, size_t setsize)
+{
+	int len = strlen(str);
+	const char *ptr = str + len - 1;
+	int cpu = 0;
+
+	/* skip 0x, it's all hex anyway */
+	if (len > 1 && !memcmp(str, "0x", 2L))
+		str += 2;
+
+	CPU_ZERO_S(setsize, set);
+
+	while (ptr >= str) {
+		char val;
+
+		/* cpu masks in /sys uses comma as a separator */
+		if (*ptr == ',')
+			ptr--;
+
+		val = char_to_val(*ptr);
+		if (val == (char) -1)
+			return -1;
+		if (val & 1)
+			CPU_SET_S(cpu, setsize, set);
+		if (val & 2)
+			CPU_SET_S(cpu + 1, setsize, set);
+		if (val & 4)
+			CPU_SET_S(cpu + 2, setsize, set);
+		if (val & 8)
+			CPU_SET_S(cpu + 3, setsize, set);
+		ptr--;
+		cpu += 4;
+	}
+
+	return 0;
+}
+
+static int nextnumber(const char *str, char **end, unsigned int *result)
+{
+	errno = 0;
+	if (str == NULL || *str == '\0' || !isdigit(*str))
+		return -EINVAL;
+	*result = (unsigned int) strtoul(str, end, 10);
+	if (errno)
+		return -errno;
+	if (str == *end)
+		return -EINVAL;
+	return 0;
+}
+
+/*
+ * Parses string with list of CPU ranges.
+ * Returns 0 on success.
+ * Returns 1 on error.
+ * Returns 2 if fail is set and a cpu number passed in the list doesn't fit
+ * into the cpu_set. If fail is not set cpu numbers that do not fit are
+ * ignored and 0 is returned instead.
+ */
+int cpulist_parse(const char *str, cpu_set_t *set, size_t setsize, int fail)
+{
+	size_t max = cpuset_nbits(setsize);
+	const char *p, *q;
+	char *end = NULL;
+
+	q = str;
+	CPU_ZERO_S(setsize, set);
+
+	while (p = q, q = nexttoken(q, ','), p) {
+		unsigned int a;	/* beginning of range */
+		unsigned int b;	/* end of range */
+		unsigned int s;	/* stride */
+		const char *c1, *c2;
+
+		if (nextnumber(p, &end, &a) != 0)
+			return 1;
+		b = a;
+		s = 1;
+		p = end;
+
+		c1 = nexttoken(p, '-');
+		c2 = nexttoken(p, ',');
+
+		if (c1 != NULL && (c2 == NULL || c1 < c2)) {
+			if (nextnumber(c1, &end, &b) != 0)
+				return 1;
+
+			c1 = end && *end ? nexttoken(end, ':') : NULL;
+
+			if (c1 != NULL && (c2 == NULL || c1 < c2)) {
+				if (nextnumber(c1, &end, &s) != 0)
+					return 1;
+				if (s == 0)
+					return 1;
+			}
+		}
+
+		if (!(a <= b))
+			return 1;
+		while (a <= b) {
+			if (fail && (a >= max))
+				return 2;
+			CPU_SET_S(a, setsize, set);
+			a += s;
+		}
+	}
+
+	if (end && *end)
+		return 1;
+	return 0;
+}
+
+#ifdef TEST_PROGRAM_CPUSET
+
+#include <getopt.h>
+
+int main(int argc, char *argv[])
+{
+	cpu_set_t *set;
+	size_t setsize, buflen, nbits;
+	char *buf, *mask = NULL, *range = NULL;
+	int ncpus = 2048, rc, c;
+
+	static const struct option longopts[] = {
+	    { "ncpus", 1, NULL, 'n' },
+	    { "mask",  1, NULL, 'm' },
+	    { "range", 1, NULL, 'r' },
+	    { NULL,    0, NULL, 0 }
+	};
+
+	while ((c = getopt_long(argc, argv, "n:m:r:", longopts, NULL)) != -1) {
+		switch(c) {
+		case 'n':
+			ncpus = atoi(optarg);
+			break;
+		case 'm':
+			mask = strdup(optarg);
+			break;
+		case 'r':
+			range = strdup(optarg);
+			break;
+		default:
+			goto usage_err;
+		}
+	}
+
+	if (!mask && !range)
+		goto usage_err;
+
+	set = cpuset_alloc(ncpus, &setsize, &nbits);
+	if (!set)
+		err(EXIT_FAILURE, "failed to allocate cpu set");
+
+	/*
+	fprintf(stderr, "ncpus: %d, cpuset bits: %zd, cpuset bytes: %zd\n",
+			ncpus, nbits, setsize);
+	*/
+
+	buflen = 7 * nbits;
+	buf = malloc(buflen);
+	if (!buf)
+		err(EXIT_FAILURE, "failed to allocate cpu set buffer");
+
+	if (mask)
+		rc = cpumask_parse(mask, set, setsize);
+	else
+		rc = cpulist_parse(range, set, setsize, 0);
+
+	if (rc)
+		errx(EXIT_FAILURE, "failed to parse string: %s", mask ? : range);
+
+	printf("%-15s = %15s ", mask ? : range,
+				cpumask_create(buf, buflen, set, setsize));
+	printf("[%s]\n", cpulist_create(buf, buflen, set, setsize));
+
+	free(buf);
+	free(mask);
+	free(range);
+	cpuset_free(set);
+
+	return EXIT_SUCCESS;
+
+usage_err:
+	fprintf(stderr,
+		"usage: %s [--ncpus <num>] --mask <mask> | --range <list>\n",
+		program_invocation_short_name);
+	exit(EXIT_FAILURE);
+}
+#endif
diff --git a/lib/crc32.c b/lib/crc32.c
new file mode 100644
index 0000000..824693d
--- /dev/null
+++ b/lib/crc32.c
@@ -0,0 +1,142 @@
+/*
+ *  COPYRIGHT (C) 1986 Gary S. Brown.  You may use this program, or
+ *  code or tables extracted from it, as desired without restriction.
+ *
+ *  First, the polynomial itself and its table of feedback terms.  The
+ *  polynomial is
+ *  X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0
+ *
+ *  Note that we take it "backwards" and put the highest-order term in
+ *  the lowest-order bit.  The X^32 term is "implied"; the LSB is the
+ *  X^31 term, etc.  The X^0 term (usually shown as "+1") results in
+ *  the MSB being 1.
+ *
+ *  Note that the usual hardware shift register implementation, which
+ *  is what we're using (we're merely optimizing it by doing eight-bit
+ *  chunks at a time) shifts bits into the lowest-order term.  In our
+ *  implementation, that means shifting towards the right.  Why do we
+ *  do it this way?  Because the calculated CRC must be transmitted in
+ *  order from highest-order term to lowest-order term.  UARTs transmit
+ *  characters in order from LSB to MSB.  By storing the CRC this way,
+ *  we hand it to the UART in the order low-byte to high-byte; the UART
+ *  sends each low-bit to high-bit; and the result is transmission bit
+ *  by bit from highest- to lowest-order term without requiring any bit
+ *  shuffling on our part.  Reception works similarly.
+ *
+ *  The feedback terms table consists of 256, 32-bit entries.  Notes
+ *
+ *      The table can be generated at runtime if desired; code to do so
+ *      is shown later.  It might not be obvious, but the feedback
+ *      terms simply represent the results of eight shift/xor opera-
+ *      tions for all combinations of data and CRC register values.
+ *
+ *      The values must be right-shifted by eight bits by the "updcrc"
+ *      logic; the shift must be unsigned (bring in zeroes).  On some
+ *      hardware you could probably optimize the shift in assembler by
+ *      using byte-swap instructions.
+ *      polynomial $edb88320
+ *
+ */
+
+#include <stdio.h>
+
+#include "crc32.h"
+
+
+static const uint32_t crc32_tab[] = {
+	0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
+	0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
+	0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
+	0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
+	0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
+	0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
+	0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
+	0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
+	0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
+	0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
+	0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
+	0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
+	0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
+	0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
+	0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
+	0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
+	0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
+	0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
+	0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
+	0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
+	0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
+	0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
+	0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
+	0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
+	0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
+	0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
+	0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
+	0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
+	0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
+	0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
+	0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
+	0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
+	0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
+	0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
+	0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
+	0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
+	0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
+	0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
+	0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
+	0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
+	0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
+	0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
+	0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
+	0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
+	0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
+	0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
+	0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
+	0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
+	0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
+	0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
+	0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
+	0x2d02ef8dL
+};
+
+static inline uint32_t crc32_add_char(uint32_t crc, unsigned char c)
+{
+	return crc32_tab[(crc ^ c) & 0xff] ^ (crc >> 8);
+}
+
+/*
+ * This a generic crc32() function, it takes seed as an argument,
+ * and does __not__ xor at the end. Then individual users can do
+ * whatever they need.
+ */
+uint32_t ul_crc32(uint32_t seed, const unsigned char *buf, size_t len)
+{
+	uint32_t crc = seed;
+	const unsigned char *p = buf;
+
+	while (len) {
+		crc = crc32_add_char(crc, *p++);
+		len--;
+	}
+
+	return crc;
+}
+
+uint32_t ul_crc32_exclude_offset(uint32_t seed, const unsigned char *buf, size_t len,
+			      size_t exclude_off, size_t exclude_len)
+{
+	uint32_t crc = seed;
+	const unsigned char *p = buf;
+	size_t i;
+
+	for (i = 0; i < len; i++) {
+		unsigned char x = *p++;
+
+		if (i >= exclude_off && i < exclude_off + exclude_len)
+			x = 0;
+
+		crc = crc32_add_char(crc, x);
+	}
+
+	return crc;
+}
+
diff --git a/lib/crc32c.c b/lib/crc32c.c
new file mode 100644
index 0000000..5776727
--- /dev/null
+++ b/lib/crc32c.c
@@ -0,0 +1,121 @@
+/*
+ * This code is from freebsd/sys/libkern/crc32.c
+ *
+ * Simplest table-based crc32c.  Performance is not important
+ * for checking crcs on superblocks
+ */
+
+/*-
+ *  COPYRIGHT (C) 1986 Gary S. Brown.  You may use this program, or
+ *  code or tables extracted from it, as desired without restriction.
+ */
+
+#include <assert.h>
+#include "crc32c.h"
+
+static const uint32_t crc32Table[256] = {
+	0x00000000L, 0xF26B8303L, 0xE13B70F7L, 0x1350F3F4L,
+	0xC79A971FL, 0x35F1141CL, 0x26A1E7E8L, 0xD4CA64EBL,
+	0x8AD958CFL, 0x78B2DBCCL, 0x6BE22838L, 0x9989AB3BL,
+	0x4D43CFD0L, 0xBF284CD3L, 0xAC78BF27L, 0x5E133C24L,
+	0x105EC76FL, 0xE235446CL, 0xF165B798L, 0x030E349BL,
+	0xD7C45070L, 0x25AFD373L, 0x36FF2087L, 0xC494A384L,
+	0x9A879FA0L, 0x68EC1CA3L, 0x7BBCEF57L, 0x89D76C54L,
+	0x5D1D08BFL, 0xAF768BBCL, 0xBC267848L, 0x4E4DFB4BL,
+	0x20BD8EDEL, 0xD2D60DDDL, 0xC186FE29L, 0x33ED7D2AL,
+	0xE72719C1L, 0x154C9AC2L, 0x061C6936L, 0xF477EA35L,
+	0xAA64D611L, 0x580F5512L, 0x4B5FA6E6L, 0xB93425E5L,
+	0x6DFE410EL, 0x9F95C20DL, 0x8CC531F9L, 0x7EAEB2FAL,
+	0x30E349B1L, 0xC288CAB2L, 0xD1D83946L, 0x23B3BA45L,
+	0xF779DEAEL, 0x05125DADL, 0x1642AE59L, 0xE4292D5AL,
+	0xBA3A117EL, 0x4851927DL, 0x5B016189L, 0xA96AE28AL,
+	0x7DA08661L, 0x8FCB0562L, 0x9C9BF696L, 0x6EF07595L,
+	0x417B1DBCL, 0xB3109EBFL, 0xA0406D4BL, 0x522BEE48L,
+	0x86E18AA3L, 0x748A09A0L, 0x67DAFA54L, 0x95B17957L,
+	0xCBA24573L, 0x39C9C670L, 0x2A993584L, 0xD8F2B687L,
+	0x0C38D26CL, 0xFE53516FL, 0xED03A29BL, 0x1F682198L,
+	0x5125DAD3L, 0xA34E59D0L, 0xB01EAA24L, 0x42752927L,
+	0x96BF4DCCL, 0x64D4CECFL, 0x77843D3BL, 0x85EFBE38L,
+	0xDBFC821CL, 0x2997011FL, 0x3AC7F2EBL, 0xC8AC71E8L,
+	0x1C661503L, 0xEE0D9600L, 0xFD5D65F4L, 0x0F36E6F7L,
+	0x61C69362L, 0x93AD1061L, 0x80FDE395L, 0x72966096L,
+	0xA65C047DL, 0x5437877EL, 0x4767748AL, 0xB50CF789L,
+	0xEB1FCBADL, 0x197448AEL, 0x0A24BB5AL, 0xF84F3859L,
+	0x2C855CB2L, 0xDEEEDFB1L, 0xCDBE2C45L, 0x3FD5AF46L,
+	0x7198540DL, 0x83F3D70EL, 0x90A324FAL, 0x62C8A7F9L,
+	0xB602C312L, 0x44694011L, 0x5739B3E5L, 0xA55230E6L,
+	0xFB410CC2L, 0x092A8FC1L, 0x1A7A7C35L, 0xE811FF36L,
+	0x3CDB9BDDL, 0xCEB018DEL, 0xDDE0EB2AL, 0x2F8B6829L,
+	0x82F63B78L, 0x709DB87BL, 0x63CD4B8FL, 0x91A6C88CL,
+	0x456CAC67L, 0xB7072F64L, 0xA457DC90L, 0x563C5F93L,
+	0x082F63B7L, 0xFA44E0B4L, 0xE9141340L, 0x1B7F9043L,
+	0xCFB5F4A8L, 0x3DDE77ABL, 0x2E8E845FL, 0xDCE5075CL,
+	0x92A8FC17L, 0x60C37F14L, 0x73938CE0L, 0x81F80FE3L,
+	0x55326B08L, 0xA759E80BL, 0xB4091BFFL, 0x466298FCL,
+	0x1871A4D8L, 0xEA1A27DBL, 0xF94AD42FL, 0x0B21572CL,
+	0xDFEB33C7L, 0x2D80B0C4L, 0x3ED04330L, 0xCCBBC033L,
+	0xA24BB5A6L, 0x502036A5L, 0x4370C551L, 0xB11B4652L,
+	0x65D122B9L, 0x97BAA1BAL, 0x84EA524EL, 0x7681D14DL,
+	0x2892ED69L, 0xDAF96E6AL, 0xC9A99D9EL, 0x3BC21E9DL,
+	0xEF087A76L, 0x1D63F975L, 0x0E330A81L, 0xFC588982L,
+	0xB21572C9L, 0x407EF1CAL, 0x532E023EL, 0xA145813DL,
+	0x758FE5D6L, 0x87E466D5L, 0x94B49521L, 0x66DF1622L,
+	0x38CC2A06L, 0xCAA7A905L, 0xD9F75AF1L, 0x2B9CD9F2L,
+	0xFF56BD19L, 0x0D3D3E1AL, 0x1E6DCDEEL, 0xEC064EEDL,
+	0xC38D26C4L, 0x31E6A5C7L, 0x22B65633L, 0xD0DDD530L,
+	0x0417B1DBL, 0xF67C32D8L, 0xE52CC12CL, 0x1747422FL,
+	0x49547E0BL, 0xBB3FFD08L, 0xA86F0EFCL, 0x5A048DFFL,
+	0x8ECEE914L, 0x7CA56A17L, 0x6FF599E3L, 0x9D9E1AE0L,
+	0xD3D3E1ABL, 0x21B862A8L, 0x32E8915CL, 0xC083125FL,
+	0x144976B4L, 0xE622F5B7L, 0xF5720643L, 0x07198540L,
+	0x590AB964L, 0xAB613A67L, 0xB831C993L, 0x4A5A4A90L,
+	0x9E902E7BL, 0x6CFBAD78L, 0x7FAB5E8CL, 0x8DC0DD8FL,
+	0xE330A81AL, 0x115B2B19L, 0x020BD8EDL, 0xF0605BEEL,
+	0x24AA3F05L, 0xD6C1BC06L, 0xC5914FF2L, 0x37FACCF1L,
+	0x69E9F0D5L, 0x9B8273D6L, 0x88D28022L, 0x7AB90321L,
+	0xAE7367CAL, 0x5C18E4C9L, 0x4F48173DL, 0xBD23943EL,
+	0xF36E6F75L, 0x0105EC76L, 0x12551F82L, 0xE03E9C81L,
+	0x34F4F86AL, 0xC69F7B69L, 0xD5CF889DL, 0x27A40B9EL,
+	0x79B737BAL, 0x8BDCB4B9L, 0x988C474DL, 0x6AE7C44EL,
+	0xBE2DA0A5L, 0x4C4623A6L, 0x5F16D052L, 0xAD7D5351L
+};
+
+/*
+ *This was singletable_crc32c() in bsd
+ *
+ * If you will not be passing crc back into this function to process more bytes,
+ * the answer is:
+ *
+ *    crc = crc32c(~0L, buf, size);
+ *  [ crc = crc32c(crc, buf, size); ]
+ *    crc ^= ~0L
+ *
+ */
+uint32_t
+crc32c(uint32_t crc, const void *buf, size_t size)
+{
+	const uint8_t *p = buf;
+
+	while (size--)
+		crc = crc32Table[(crc ^ *p++) & 0xff] ^ (crc >> 8);
+
+	return crc;
+}
+
+uint32_t
+ul_crc32c_exclude_offset(uint32_t crc, const unsigned char *buf, size_t size,
+			 size_t exclude_off, size_t exclude_len)
+{
+	size_t i;
+
+	assert((exclude_off + exclude_len) <= size);
+
+	crc = crc32c(crc, buf, exclude_off);
+	for (i = 0; i < exclude_len; i++) {
+		uint8_t zero = 0;
+		crc = crc32c(crc, &zero, 1);
+	}
+	crc = crc32c(crc, &buf[exclude_off + exclude_len],
+		     size - (exclude_off + exclude_len));
+	return crc;
+}
diff --git a/lib/crc64.c b/lib/crc64.c
new file mode 100644
index 0000000..f2ac38a
--- /dev/null
+++ b/lib/crc64.c
@@ -0,0 +1,366 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Library: libcrc
+ * File:    src/crc64.c
+ * Author:  Lammert Bies
+ *
+ * This file is licensed under the MIT License as stated below
+ *
+ * Copyright (c) 2016 Lammert Bies
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Description
+ * -----------
+ * The source file contains the routines which are needed to
+ * calculate a 64 bit CRC value of a sequence of bytes.
+ */
+
+#include <stdbool.h>
+#include <stdlib.h>
+
+#include "crc64.h"
+
+#define		CRC_START_64_ECMA	0x0000000000000000ull
+#define		CRC_START_64_WE		0xFFFFFFFFFFFFFFFFull
+
+const uint64_t crc_tab64[256] = {
+	0x0000000000000000ull,
+	0x42F0E1EBA9EA3693ull,
+	0x85E1C3D753D46D26ull,
+	0xC711223CFA3E5BB5ull,
+	0x493366450E42ECDFull,
+	0x0BC387AEA7A8DA4Cull,
+	0xCCD2A5925D9681F9ull,
+	0x8E224479F47CB76Aull,
+	0x9266CC8A1C85D9BEull,
+	0xD0962D61B56FEF2Dull,
+	0x17870F5D4F51B498ull,
+	0x5577EEB6E6BB820Bull,
+	0xDB55AACF12C73561ull,
+	0x99A54B24BB2D03F2ull,
+	0x5EB4691841135847ull,
+	0x1C4488F3E8F96ED4ull,
+	0x663D78FF90E185EFull,
+	0x24CD9914390BB37Cull,
+	0xE3DCBB28C335E8C9ull,
+	0xA12C5AC36ADFDE5Aull,
+	0x2F0E1EBA9EA36930ull,
+	0x6DFEFF5137495FA3ull,
+	0xAAEFDD6DCD770416ull,
+	0xE81F3C86649D3285ull,
+	0xF45BB4758C645C51ull,
+	0xB6AB559E258E6AC2ull,
+	0x71BA77A2DFB03177ull,
+	0x334A9649765A07E4ull,
+	0xBD68D2308226B08Eull,
+	0xFF9833DB2BCC861Dull,
+	0x388911E7D1F2DDA8ull,
+	0x7A79F00C7818EB3Bull,
+	0xCC7AF1FF21C30BDEull,
+	0x8E8A101488293D4Dull,
+	0x499B3228721766F8ull,
+	0x0B6BD3C3DBFD506Bull,
+	0x854997BA2F81E701ull,
+	0xC7B97651866BD192ull,
+	0x00A8546D7C558A27ull,
+	0x4258B586D5BFBCB4ull,
+	0x5E1C3D753D46D260ull,
+	0x1CECDC9E94ACE4F3ull,
+	0xDBFDFEA26E92BF46ull,
+	0x990D1F49C77889D5ull,
+	0x172F5B3033043EBFull,
+	0x55DFBADB9AEE082Cull,
+	0x92CE98E760D05399ull,
+	0xD03E790CC93A650Aull,
+	0xAA478900B1228E31ull,
+	0xE8B768EB18C8B8A2ull,
+	0x2FA64AD7E2F6E317ull,
+	0x6D56AB3C4B1CD584ull,
+	0xE374EF45BF6062EEull,
+	0xA1840EAE168A547Dull,
+	0x66952C92ECB40FC8ull,
+	0x2465CD79455E395Bull,
+	0x3821458AADA7578Full,
+	0x7AD1A461044D611Cull,
+	0xBDC0865DFE733AA9ull,
+	0xFF3067B657990C3Aull,
+	0x711223CFA3E5BB50ull,
+	0x33E2C2240A0F8DC3ull,
+	0xF4F3E018F031D676ull,
+	0xB60301F359DBE0E5ull,
+	0xDA050215EA6C212Full,
+	0x98F5E3FE438617BCull,
+	0x5FE4C1C2B9B84C09ull,
+	0x1D14202910527A9Aull,
+	0x93366450E42ECDF0ull,
+	0xD1C685BB4DC4FB63ull,
+	0x16D7A787B7FAA0D6ull,
+	0x5427466C1E109645ull,
+	0x4863CE9FF6E9F891ull,
+	0x0A932F745F03CE02ull,
+	0xCD820D48A53D95B7ull,
+	0x8F72ECA30CD7A324ull,
+	0x0150A8DAF8AB144Eull,
+	0x43A04931514122DDull,
+	0x84B16B0DAB7F7968ull,
+	0xC6418AE602954FFBull,
+	0xBC387AEA7A8DA4C0ull,
+	0xFEC89B01D3679253ull,
+	0x39D9B93D2959C9E6ull,
+	0x7B2958D680B3FF75ull,
+	0xF50B1CAF74CF481Full,
+	0xB7FBFD44DD257E8Cull,
+	0x70EADF78271B2539ull,
+	0x321A3E938EF113AAull,
+	0x2E5EB66066087D7Eull,
+	0x6CAE578BCFE24BEDull,
+	0xABBF75B735DC1058ull,
+	0xE94F945C9C3626CBull,
+	0x676DD025684A91A1ull,
+	0x259D31CEC1A0A732ull,
+	0xE28C13F23B9EFC87ull,
+	0xA07CF2199274CA14ull,
+	0x167FF3EACBAF2AF1ull,
+	0x548F120162451C62ull,
+	0x939E303D987B47D7ull,
+	0xD16ED1D631917144ull,
+	0x5F4C95AFC5EDC62Eull,
+	0x1DBC74446C07F0BDull,
+	0xDAAD56789639AB08ull,
+	0x985DB7933FD39D9Bull,
+	0x84193F60D72AF34Full,
+	0xC6E9DE8B7EC0C5DCull,
+	0x01F8FCB784FE9E69ull,
+	0x43081D5C2D14A8FAull,
+	0xCD2A5925D9681F90ull,
+	0x8FDAB8CE70822903ull,
+	0x48CB9AF28ABC72B6ull,
+	0x0A3B7B1923564425ull,
+	0x70428B155B4EAF1Eull,
+	0x32B26AFEF2A4998Dull,
+	0xF5A348C2089AC238ull,
+	0xB753A929A170F4ABull,
+	0x3971ED50550C43C1ull,
+	0x7B810CBBFCE67552ull,
+	0xBC902E8706D82EE7ull,
+	0xFE60CF6CAF321874ull,
+	0xE224479F47CB76A0ull,
+	0xA0D4A674EE214033ull,
+	0x67C58448141F1B86ull,
+	0x253565A3BDF52D15ull,
+	0xAB1721DA49899A7Full,
+	0xE9E7C031E063ACECull,
+	0x2EF6E20D1A5DF759ull,
+	0x6C0603E6B3B7C1CAull,
+	0xF6FAE5C07D3274CDull,
+	0xB40A042BD4D8425Eull,
+	0x731B26172EE619EBull,
+	0x31EBC7FC870C2F78ull,
+	0xBFC9838573709812ull,
+	0xFD39626EDA9AAE81ull,
+	0x3A28405220A4F534ull,
+	0x78D8A1B9894EC3A7ull,
+	0x649C294A61B7AD73ull,
+	0x266CC8A1C85D9BE0ull,
+	0xE17DEA9D3263C055ull,
+	0xA38D0B769B89F6C6ull,
+	0x2DAF4F0F6FF541ACull,
+	0x6F5FAEE4C61F773Full,
+	0xA84E8CD83C212C8Aull,
+	0xEABE6D3395CB1A19ull,
+	0x90C79D3FEDD3F122ull,
+	0xD2377CD44439C7B1ull,
+	0x15265EE8BE079C04ull,
+	0x57D6BF0317EDAA97ull,
+	0xD9F4FB7AE3911DFDull,
+	0x9B041A914A7B2B6Eull,
+	0x5C1538ADB04570DBull,
+	0x1EE5D94619AF4648ull,
+	0x02A151B5F156289Cull,
+	0x4051B05E58BC1E0Full,
+	0x87409262A28245BAull,
+	0xC5B073890B687329ull,
+	0x4B9237F0FF14C443ull,
+	0x0962D61B56FEF2D0ull,
+	0xCE73F427ACC0A965ull,
+	0x8C8315CC052A9FF6ull,
+	0x3A80143F5CF17F13ull,
+	0x7870F5D4F51B4980ull,
+	0xBF61D7E80F251235ull,
+	0xFD913603A6CF24A6ull,
+	0x73B3727A52B393CCull,
+	0x31439391FB59A55Full,
+	0xF652B1AD0167FEEAull,
+	0xB4A25046A88DC879ull,
+	0xA8E6D8B54074A6ADull,
+	0xEA16395EE99E903Eull,
+	0x2D071B6213A0CB8Bull,
+	0x6FF7FA89BA4AFD18ull,
+	0xE1D5BEF04E364A72ull,
+	0xA3255F1BE7DC7CE1ull,
+	0x64347D271DE22754ull,
+	0x26C49CCCB40811C7ull,
+	0x5CBD6CC0CC10FAFCull,
+	0x1E4D8D2B65FACC6Full,
+	0xD95CAF179FC497DAull,
+	0x9BAC4EFC362EA149ull,
+	0x158E0A85C2521623ull,
+	0x577EEB6E6BB820B0ull,
+	0x906FC95291867B05ull,
+	0xD29F28B9386C4D96ull,
+	0xCEDBA04AD0952342ull,
+	0x8C2B41A1797F15D1ull,
+	0x4B3A639D83414E64ull,
+	0x09CA82762AAB78F7ull,
+	0x87E8C60FDED7CF9Dull,
+	0xC51827E4773DF90Eull,
+	0x020905D88D03A2BBull,
+	0x40F9E43324E99428ull,
+	0x2CFFE7D5975E55E2ull,
+	0x6E0F063E3EB46371ull,
+	0xA91E2402C48A38C4ull,
+	0xEBEEC5E96D600E57ull,
+	0x65CC8190991CB93Dull,
+	0x273C607B30F68FAEull,
+	0xE02D4247CAC8D41Bull,
+	0xA2DDA3AC6322E288ull,
+	0xBE992B5F8BDB8C5Cull,
+	0xFC69CAB42231BACFull,
+	0x3B78E888D80FE17Aull,
+	0x7988096371E5D7E9ull,
+	0xF7AA4D1A85996083ull,
+	0xB55AACF12C735610ull,
+	0x724B8ECDD64D0DA5ull,
+	0x30BB6F267FA73B36ull,
+	0x4AC29F2A07BFD00Dull,
+	0x08327EC1AE55E69Eull,
+	0xCF235CFD546BBD2Bull,
+	0x8DD3BD16FD818BB8ull,
+	0x03F1F96F09FD3CD2ull,
+	0x41011884A0170A41ull,
+	0x86103AB85A2951F4ull,
+	0xC4E0DB53F3C36767ull,
+	0xD8A453A01B3A09B3ull,
+	0x9A54B24BB2D03F20ull,
+	0x5D45907748EE6495ull,
+	0x1FB5719CE1045206ull,
+	0x919735E51578E56Cull,
+	0xD367D40EBC92D3FFull,
+	0x1476F63246AC884Aull,
+	0x568617D9EF46BED9ull,
+	0xE085162AB69D5E3Cull,
+	0xA275F7C11F7768AFull,
+	0x6564D5FDE549331Aull,
+	0x279434164CA30589ull,
+	0xA9B6706FB8DFB2E3ull,
+	0xEB46918411358470ull,
+	0x2C57B3B8EB0BDFC5ull,
+	0x6EA7525342E1E956ull,
+	0x72E3DAA0AA188782ull,
+	0x30133B4B03F2B111ull,
+	0xF7021977F9CCEAA4ull,
+	0xB5F2F89C5026DC37ull,
+	0x3BD0BCE5A45A6B5Dull,
+	0x79205D0E0DB05DCEull,
+	0xBE317F32F78E067Bull,
+	0xFCC19ED95E6430E8ull,
+	0x86B86ED5267CDBD3ull,
+	0xC4488F3E8F96ED40ull,
+	0x0359AD0275A8B6F5ull,
+	0x41A94CE9DC428066ull,
+	0xCF8B0890283E370Cull,
+	0x8D7BE97B81D4019Full,
+	0x4A6ACB477BEA5A2Aull,
+	0x089A2AACD2006CB9ull,
+	0x14DEA25F3AF9026Dull,
+	0x562E43B4931334FEull,
+	0x913F6188692D6F4Bull,
+	0xD3CF8063C0C759D8ull,
+	0x5DEDC41A34BBEEB2ull,
+	0x1F1D25F19D51D821ull,
+	0xD80C07CD676F8394ull,
+	0x9AFCE626CE85B507ull
+};
+
+
+/*
+ * uint64_t crc_64_ecma( const unsigned char *input_str, size_t num_bytes );
+ *
+ * The function crc_64_ecma() calculates in one pass the ECMA 64 bit CRC value
+ * for a byte string that is passed to the function together with a parameter
+ * indicating the length.
+ */
+
+uint64_t ul_crc64_ecma( const unsigned char *input_str, size_t num_bytes ) {
+
+	uint64_t crc;
+	const unsigned char *ptr;
+	size_t a;
+
+	crc = CRC_START_64_ECMA;
+	ptr = input_str;
+
+	if ( ptr != NULL ) for (a=0; a<num_bytes; a++) {
+
+		crc = (crc << 8) ^ crc_tab64[ ((crc >> 56) ^ (uint64_t) *ptr++) & 0x00000000000000FFull ];
+	}
+
+	return crc;
+
+}  /* crc_64_ecma */
+
+/*
+ * uint64_t ul_crc64_we( const unsigned char *input_str, size_t num_bytes );
+ *
+ * The function crc_64_we() calculates in one pass the CRC64-WE 64 bit CRC
+ * value for a byte string that is passed to the function together with a
+ * parameter indicating the length.
+ */
+
+uint64_t ul_crc64_we( const unsigned char *input_str, size_t num_bytes ) {
+
+	uint64_t crc;
+	const unsigned char *ptr;
+	size_t a;
+
+	crc = CRC_START_64_WE;
+	ptr = input_str;
+
+	if ( ptr != NULL ) for (a=0; a<num_bytes; a++) {
+
+		crc = (crc << 8) ^ crc_tab64[ ((crc >> 56) ^ (uint64_t) *ptr++) & 0x00000000000000FFull ];
+	}
+
+	return crc ^ 0xFFFFFFFFFFFFFFFFull;
+
+}  /* crc_64_we */
+
+/*
+ * uint64_t ul_update_crc64( uint64_t crc, unsigned char c );
+ *
+ * The function update_crc_64() calculates a new CRC-64 value based on the
+ * previous value of the CRC and the next byte of the data to be checked.
+ */
+
+uint64_t ul_update_crc64( uint64_t crc, unsigned char c ) {
+
+	return (crc << 8) ^ crc_tab64[ ((crc >> 56) ^ (uint64_t) c) & 0x00000000000000FFull ];
+
+}  /* update_crc_64 */
diff --git a/lib/encode.c b/lib/encode.c
new file mode 100644
index 0000000..10b5971
--- /dev/null
+++ b/lib/encode.c
@@ -0,0 +1,79 @@
+/*
+ * Based on code from libblkid,
+ *
+ * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
+ * Copyright (C) 2009 Karel Zak <kzak@redhat.com>
+ * Copyright (C) 2020 Pali Rohár <pali.rohar@gmail.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+#include "c.h"
+#include "encode.h"
+
+size_t ul_encode_to_utf8(int enc, unsigned char *dest, size_t len,
+			const unsigned char *src, size_t count)
+{
+	size_t i, j;
+	uint32_t c;
+	uint16_t c2;
+
+	for (j = i = 0; i < count; i++) {
+		if (enc == UL_ENCODE_UTF16LE) {
+			if (i+2 > count)
+				break;
+			c = (src[i+1] << 8) | src[i];
+			i++;
+		} else if (enc == UL_ENCODE_UTF16BE) {
+			if (i+2 > count)
+				break;
+			c = (src[i] << 8) | src[i+1];
+			i++;
+		} else if (enc == UL_ENCODE_LATIN1) {
+			c = src[i];
+		} else {
+			return 0;
+		}
+		if ((enc == UL_ENCODE_UTF16LE || enc == UL_ENCODE_UTF16BE) &&
+		    c >= 0xD800 && c <= 0xDBFF && i+2 < count) {
+			if (enc == UL_ENCODE_UTF16LE)
+				c2 = (src[i+2] << 8) | src[i+1];
+			else
+				c2 = (src[i+1] << 8) | src[i+2];
+			if (c2 >= 0xDC00 && c2 <= 0xDFFF) {
+				c = 0x10000 + ((c - 0xD800) << 10) + (c2 - 0xDC00);
+				i += 2;
+			}
+		}
+		if (c == 0) {
+			dest[j] = '\0';
+			break;
+		}
+
+		if (c < 0x80) {
+			if (j+1 >= len)
+				break;
+			dest[j++] = (uint8_t) c;
+		} else if (c < 0x800) {
+			if (j+2 >= len)
+				break;
+			dest[j++] = (uint8_t) (0xc0 | (c >> 6));
+			dest[j++] = (uint8_t) (0x80 | (c & 0x3f));
+		} else if (c < 0x10000) {
+			if (j+3 >= len)
+				break;
+			dest[j++] = (uint8_t) (0xe0 | (c >> 12));
+			dest[j++] = (uint8_t) (0x80 | ((c >> 6) & 0x3f));
+			dest[j++] = (uint8_t) (0x80 | (c & 0x3f));
+		} else {
+			if (j+4 >= len)
+				break;
+			dest[j++] = (uint8_t) (0xf0 | (c >> 18));
+			dest[j++] = (uint8_t) (0x80 | ((c >> 12) & 0x3f));
+			dest[j++] = (uint8_t) (0x80 | ((c >> 6) & 0x3f));
+			dest[j++] = (uint8_t) (0x80 | (c & 0x3f));
+		}
+	}
+	dest[j] = '\0';
+	return j;
+}
diff --git a/lib/env.c b/lib/env.c
new file mode 100644
index 0000000..2b3395c
--- /dev/null
+++ b/lib/env.c
@@ -0,0 +1,264 @@
+/*
+ * environ[] array cleanup code and getenv() wrappers
+ *
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#ifdef HAVE_SYS_PRCTL_H
+#include <sys/prctl.h>
+#else
+#define PR_GET_DUMPABLE 3
+#endif
+#if (!defined(HAVE_PRCTL) && defined(linux))
+#include <sys/syscall.h>
+#endif
+#include <unistd.h>
+#include <sys/types.h>
+
+#include "env.h"
+#include "all-io.h"
+
+#ifndef HAVE_ENVIRON_DECL
+extern char **environ;
+#endif
+
+static char * const forbid[] = {
+        "BASH_ENV=",    /* GNU creeping featurism strikes again... */
+        "ENV=",
+        "HOME=",
+        "IFS=",
+        "KRB_CONF=",
+        "LD_",          /* anything with the LD_ prefix */
+        "LIBPATH=",
+        "MAIL=",
+        "NLSPATH=",
+        "PATH=",
+        "SHELL=",
+        "SHLIB_PATH=",
+        (char *) 0
+};
+
+/* these are allowed, but with no slashes inside
+   (to work around security problems in GNU gettext) */
+static char * const noslash[] = {
+        "LANG=",
+        "LANGUAGE=",
+        "LC_",          /* anything with the LC_ prefix */
+        (char *) 0
+};
+
+
+struct ul_env_list {
+	char *env;
+	struct ul_env_list *next;
+};
+
+/*
+ * Saves @name env.variable to @ls, returns pointer to the new head of the list.
+ */
+static struct ul_env_list *env_list_add(struct ul_env_list *ls0, const char *str)
+{
+	struct ul_env_list *ls;
+	char *p;
+	size_t sz = 0;
+
+	if (!str || !*str)
+		return ls0;
+
+	sz = strlen(str) + 1;
+	p = malloc(sizeof(struct ul_env_list) + sz);
+	if (!p)
+		return ls0;
+
+	ls = (struct ul_env_list *) p;
+	p += sizeof(struct ul_env_list);
+	memcpy(p, str, sz);
+	ls->env = p;
+
+	ls->next = ls0;
+	return ls;
+}
+
+/*
+ * Use env_from_fd() to read environment from @fd.
+ *
+ * @fd must be /proc/<pid>/environ file.
+*/
+struct ul_env_list *env_from_fd(int fd)
+{
+	char *buf = NULL, *p;
+	ssize_t rc = 0;
+	struct ul_env_list *ls = NULL;
+
+	if ((rc = read_all_alloc(fd, &buf)) < 1)
+		return NULL;
+	buf[rc] = '\0';
+	p = buf;
+
+	while (rc > 0) {
+		ls = env_list_add(ls, p);
+		p += strlen(p) + 1;
+		rc -= strlen(p) + 1;
+	}
+
+	free(buf);
+	return ls;
+}
+
+/*
+ * Use setenv() for all stuff in @ls.
+ *
+ * It would be possible to use putenv(), but we want to keep @ls free()-able.
+ */
+int env_list_setenv(struct ul_env_list *ls)
+{
+	int rc = 0;
+
+	while (ls && rc == 0) {
+		if (ls->env) {
+			char *val = strchr(ls->env, '=');
+			if (!val)
+				continue;
+			*val = '\0';
+			rc = setenv(ls->env, val + 1, 0);
+			*val = '=';
+		}
+		ls = ls->next;
+	}
+	return rc;
+}
+
+void env_list_free(struct ul_env_list *ls)
+{
+	while (ls) {
+		struct ul_env_list *x = ls;
+		ls = ls->next;
+		free(x);
+	}
+}
+
+/*
+ * Removes unwanted variables from environ[]. If @org is not NULL than stores
+ * unwnated variables to the list.
+ */
+void __sanitize_env(struct ul_env_list **org)
+{
+        char **envp = environ;
+        char * const *bad;
+        char **cur;
+        int last = 0;
+
+        for (cur = envp; *cur; cur++)
+                last++;
+
+        for (cur = envp; *cur; cur++) {
+                for (bad = forbid; *bad; bad++) {
+                        if (strncmp(*cur, *bad, strlen(*bad)) == 0) {
+				if (org)
+					*org = env_list_add(*org, *cur);
+                                last = remote_entry(envp, cur - envp, last);
+                                cur--;
+                                break;
+                        }
+                }
+        }
+
+        for (cur = envp; *cur; cur++) {
+                for (bad = noslash; *bad; bad++) {
+                        if (strncmp(*cur, *bad, strlen(*bad)) != 0)
+                                continue;
+                        if (!strchr(*cur, '/'))
+                                continue;  /* OK */
+			if (org)
+				*org = env_list_add(*org, *cur);
+                        last = remote_entry(envp, cur - envp, last);
+                        cur--;
+                        break;
+                }
+        }
+}
+
+void sanitize_env(void)
+{
+	__sanitize_env(NULL);
+}
+
+char *safe_getenv(const char *arg)
+{
+	if ((getuid() != geteuid()) || (getgid() != getegid()))
+		return NULL;
+#ifdef HAVE_PRCTL
+	if (prctl(PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
+		return NULL;
+#else
+#if (defined(linux) && defined(SYS_prctl))
+	if (syscall(SYS_prctl, PR_GET_DUMPABLE, 0, 0, 0, 0) == 0)
+		return NULL;
+#endif
+#endif
+#ifdef HAVE_SECURE_GETENV
+return secure_getenv(arg);
+#elif HAVE___SECURE_GETENV
+	return __secure_getenv(arg);
+#else
+	return getenv(arg);
+#endif
+}
+
+#ifdef TEST_PROGRAM
+int main(void)
+{
+	char *const *bad;
+	char copy[32];
+	char *p;
+	int retval = EXIT_SUCCESS;
+	struct ul_env_list *removed = NULL;
+
+	for (bad = forbid; *bad; bad++) {
+		strcpy(copy, *bad);
+		p = strchr(copy, '=');
+		if (p)
+			*p = '\0';
+		setenv(copy, copy, 1);
+	}
+
+	/* removed */
+	__sanitize_env(&removed);
+
+	/* check removal */
+	for (bad = forbid; *bad; bad++) {
+		strcpy(copy, *bad);
+		p = strchr(copy, '=');
+		if (p)
+			*p = '\0';
+		p = getenv(copy);
+		if (p) {
+			warnx("%s was not removed", copy);
+			retval = EXIT_FAILURE;
+		}
+	}
+
+	/* restore removed */
+	env_list_setenv(removed);
+
+	/* check restore */
+	for (bad = forbid; *bad; bad++) {
+		strcpy(copy, *bad);
+		p = strchr(copy, '=');
+		if (p)
+			*p = '\0';
+		p = getenv(copy);
+		if (!p) {
+			warnx("%s was not restored", copy);
+			retval = EXIT_FAILURE;
+		}
+	}
+
+	env_list_free(removed);
+
+	return retval;
+}
+#endif
diff --git a/lib/exec_shell.c b/lib/exec_shell.c
new file mode 100644
index 0000000..6fef6c7
--- /dev/null
+++ b/lib/exec_shell.c
@@ -0,0 +1,51 @@
+/*
+ * exec_shell() - launch a shell, else exit!
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <libgen.h>
+
+#include "nls.h"
+#include "c.h"
+#include "xalloc.h"
+
+#include "exec_shell.h"
+
+#define DEFAULT_SHELL "/bin/sh"
+
+void __attribute__((__noreturn__)) exec_shell(void)
+{
+	const char *shell = getenv("SHELL");
+	char *shellc;
+	const char *shell_basename;
+	char *arg0;
+
+	if (!shell)
+		shell = DEFAULT_SHELL;
+
+	shellc = xstrdup(shell);
+	shell_basename = basename(shellc);
+	arg0 = xmalloc(strlen(shell_basename) + 2);
+	arg0[0] = '-';
+	strcpy(arg0 + 1, shell_basename);
+
+	execl(shell, arg0, (char *)NULL);
+	errexec(shell);
+}
diff --git a/lib/fileeq.c b/lib/fileeq.c
new file mode 100644
index 0000000..af5b4e3
--- /dev/null
+++ b/lib/fileeq.c
@@ -0,0 +1,640 @@
+/*
+ * compare files content
+ *
+ * The goal is to minimize number of data we need to read from the files and be
+ * ready to compare large set of files, it means reuse the previous data if
+ * possible. It never read entire file if not necessary.
+ *
+ * The another goal is to minimize number of open files (imagine "hardlink /"),
+ * the code can open only two files and reopen the file next time if
+ * necessary.
+ *
+ * This code supports multiple comparison methods. The very basic step which is
+ * generic for all methods is to read and compare an "intro" (a few bytes from
+ * the begging of the file). This intro buffer is always cached in 'struct
+ * ul_fileeq_data', this intro buffer is addresses as block=0. This primitive
+ * thing can reduce a lot ...
+ *
+ * The next steps depend on selected method:
+ *
+ *  * memcmp method: always read data to userspace, nothing is cached, compare
+ *  directly files content; fast for small sets of the small files.
+ *
+ *  * Linux crypto API: zero-copy method based on sendfile(), data blocks are
+ *  send to the kernel hash functions (sha1, ...), and only hash digest is read
+ *  and cached in usersapce. Fast for large set of (large) files.
+ *
+ *
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Written by Karel Zak <kzak@redhat.com> [October 2021]
+ */
+
+#include <inttypes.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+/* Linux crypto */
+#ifdef HAVE_LINUX_IF_ALG_H
+# include <sys/socket.h>
+# include <linux/if_alg.h>
+# include <sys/param.h>
+# include <sys/sendfile.h>
+#endif
+
+#include "c.h"
+#include "all-io.h"
+#include "fileeq.h"
+#include "debug.h"
+
+static UL_DEBUG_DEFINE_MASK(ulfileeq);
+UL_DEBUG_DEFINE_MASKNAMES(ulfileeq) = UL_DEBUG_EMPTY_MASKNAMES;
+
+#define ULFILEEQ_DEBUG_INIT	(1 << 1)
+#define ULFILEEQ_DEBUG_CRYPTO	(1 << 2)
+#define ULFILEEQ_DEBUG_DATA	(1 << 3)
+#define ULFILEEQ_DEBUG_EQ	(1 << 4)
+
+#define DBG(m, x)       __UL_DBG(ulfileeq, ULFILEEQ_DEBUG_, m, x)
+#define ON_DBG(m, x)    __UL_DBG_CALL(ulfileeq, ULFILEEQ_DEBUG_, m, x)
+
+#define UL_DEBUG_CURRENT_MASK	UL_DEBUG_MASK(ulfileeq)
+#include "debugobj.h"
+
+static void ul_fileeq_init_debug(void)
+{
+	if (ulfileeq_debug_mask)
+		return;
+	__UL_INIT_DEBUG_FROM_ENV(ulfileeq, ULFILEEQ_DEBUG_, 0, ULFILEEQ_DEBUG);
+}
+
+enum {
+	UL_FILEEQ_MEMCMP,
+	UL_FILEEQ_SHA1,
+	UL_FILEEQ_SHA256,
+	UL_FILEEQ_CRC32
+};
+
+struct ul_fileeq_method {
+	int id;
+	const char *name;	/* name used by applications */
+	const char *kname;	/* name used by kernel crypto */
+	short digsiz;
+};
+
+static const struct ul_fileeq_method ul_eq_methods[] = {
+	[UL_FILEEQ_MEMCMP] = {
+		.id = UL_FILEEQ_MEMCMP, .name = "memcmp"
+	},
+#ifdef USE_FILEEQ_CRYPTOAPI
+	[UL_FILEEQ_SHA1] = {
+		.id = UL_FILEEQ_SHA1, .name = "sha1",
+		.digsiz = 20, .kname = "sha1"
+	},
+	[UL_FILEEQ_SHA256] = {
+		.id = UL_FILEEQ_SHA256, .name = "sha256",
+		.digsiz = 32, .kname = "sha256"
+	},
+
+	[UL_FILEEQ_CRC32] = {
+		.id = UL_FILEEQ_CRC32, .name = "crc32",
+		.digsiz = 4, .kname = "crc32c"
+	}
+#endif
+};
+
+#ifdef USE_FILEEQ_CRYPTOAPI
+static void deinit_crypto_api(struct ul_fileeq *eq)
+{
+	if (!eq)
+		return;
+
+	DBG(CRYPTO, ul_debugobj(eq, "deinit"));
+
+	if (eq->fd_cip >= 0)
+		close(eq->fd_cip);
+	if (eq->fd_api >= 0)
+		close(eq->fd_api);
+
+	eq->fd_cip = eq->fd_api = -1;
+
+}
+
+static int init_crypto_api(struct ul_fileeq *eq)
+{
+	struct sockaddr_alg sa = {
+		.salg_family = AF_ALG,
+		.salg_type   = "hash",
+	};
+
+	assert(eq->method);
+	assert(eq->method->kname);
+	assert(eq->fd_api == -1);
+	assert(eq->fd_cip == -1);
+
+	DBG(CRYPTO, ul_debugobj(eq, "init [%s]", eq->method->kname));
+
+	assert(sizeof(sa.salg_name) > strlen(eq->method->kname) + 1);
+	memcpy(&sa.salg_name, eq->method->kname, strlen(eq->method->kname) + 1);
+
+	if ((eq->fd_api = socket(AF_ALG, SOCK_SEQPACKET, 0)) < 0)
+		goto fail;
+	if (bind(eq->fd_api, (struct sockaddr *) &sa, sizeof(sa)) != 0)
+		goto fail;
+	if ((eq->fd_cip = accept(eq->fd_api, NULL, 0)) < 0)
+		goto fail;
+	return 0;
+fail:
+	deinit_crypto_api(eq);
+	return -1;
+}
+#endif
+
+int ul_fileeq_init(struct ul_fileeq *eq, const char *method)
+{
+	size_t i;
+
+	ul_fileeq_init_debug();
+	DBG(EQ, ul_debugobj(eq, "init [%s]", method));
+
+	memset(eq, 0, sizeof(*eq));
+	eq->fd_api = -1;
+	eq->fd_cip = -1;
+
+	for (i = 0; i < ARRAY_SIZE(ul_eq_methods); i++) {
+		const struct ul_fileeq_method *m = &ul_eq_methods[i];
+
+		if (strcmp(m->name, method) == 0) {
+			eq->method = m;
+			break;
+		}
+	}
+
+	if (!eq->method)
+		return -1;
+#ifdef USE_FILEEQ_CRYPTOAPI
+	if (eq->method->id != UL_FILEEQ_MEMCMP
+	    && init_crypto_api(eq) != 0)
+		return -1;
+#endif
+	return 0;
+}
+
+void ul_fileeq_deinit(struct ul_fileeq *eq)
+{
+	if (!eq)
+		return;
+
+	DBG(EQ, ul_debugobj(eq, "deinit"));
+#ifdef USE_FILEEQ_CRYPTOAPI
+	deinit_crypto_api(eq);
+#endif
+	free(eq->buf_a);
+	free(eq->buf_b);
+}
+
+void ul_fileeq_data_close_file(struct ul_fileeq_data *data)
+{
+	assert(data);
+
+	if (data->fd >= 0) {
+		DBG(DATA, ul_debugobj(data, "close"));
+		close(data->fd);
+	}
+	data->fd = -1;
+}
+
+void ul_fileeq_data_init(struct ul_fileeq_data *data)
+{
+	DBG(DATA, ul_debugobj(data, "init"));
+	memset(data, 0, sizeof(*data));
+	data->fd = -1;
+}
+
+void ul_fileeq_data_deinit(struct ul_fileeq_data *data)
+{
+	assert(data);
+
+	DBG(DATA, ul_debugobj(data, "deinit"));
+	free(data->blocks);
+	data->blocks = NULL;
+	data->nblocks = 0;
+	data->maxblocks = 0;
+	data->is_eof = 0;
+	data->name = NULL;
+
+	ul_fileeq_data_close_file(data);
+}
+
+int ul_fileeq_data_associated(struct ul_fileeq_data *data)
+{
+	return data->name != NULL;
+}
+
+void ul_fileeq_data_set_file(struct ul_fileeq_data *data, const char *name)
+{
+	assert(data);
+	assert(name);
+
+	DBG(DATA, ul_debugobj(data, "set file: %s", name));
+	ul_fileeq_data_init(data);
+	data->name = name;
+}
+
+size_t ul_fileeq_set_size(struct ul_fileeq *eq, uint64_t filesiz,
+			 size_t readsiz, size_t memsiz)
+{
+	uint64_t nreads, maxdigs;
+	size_t digsiz;
+
+	assert(eq);
+
+	eq->filesiz = filesiz;
+
+	switch (eq->method->id) {
+	case UL_FILEEQ_MEMCMP:
+		/* align file size */
+		filesiz = (filesiz + readsiz) / readsiz * readsiz;
+		break;
+	default:
+		digsiz = eq->method->digsiz;
+		if (readsiz < digsiz)
+			readsiz = digsiz;
+		/* align file size */
+		filesiz = (filesiz + readsiz) / readsiz * readsiz;
+		/* calculate limits */
+		maxdigs = memsiz / digsiz;
+		if (maxdigs == 0)
+			maxdigs = 1;
+		nreads = filesiz / readsiz;
+		/* enlarge readsize for large files */
+		if (nreads > maxdigs)
+			readsiz = filesiz / maxdigs;
+		break;
+	}
+
+	eq->readsiz = readsiz;
+	eq->blocksmax = filesiz / readsiz;
+
+	DBG(EQ, ul_debugobj(eq, "set sizes: filesiz=%ju, maxblocks=%" PRIu64 ", readsiz=%zu",
+				eq->filesiz, eq->blocksmax, eq->readsiz));
+	return eq->blocksmax;
+}
+
+static unsigned char *get_buffer(struct ul_fileeq *eq)
+{
+	if (!eq->buf_a)
+		eq->buf_a = malloc(eq->readsiz);
+	if (!eq->buf_b)
+		eq->buf_b = malloc(eq->readsiz);
+
+	if (!eq->buf_a || !eq->buf_b)
+		return NULL;
+
+	if (eq->buf_last == eq->buf_b)
+		eq->buf_last = eq->buf_a;
+	else
+		eq->buf_last = eq->buf_b;
+
+	return eq->buf_last;
+}
+
+#define get_cached_nblocks(_d) \
+			((_d)->nblocks ? (_d)->nblocks - 1 : 0)
+
+#define get_cached_offset(_e, _d) \
+			((_d)->nblocks == 0 ? 0 : \
+				sizeof((_d)->intro) \
+				+ (get_cached_nblocks(_d) * (_e)->readsiz))
+
+
+static int get_fd(struct ul_fileeq *eq, struct ul_fileeq_data *data, off_t *off)
+{
+	off_t o = get_cached_offset(eq, data);
+
+	assert(eq);
+	assert(data);
+
+
+	if (data->fd < 0) {
+		DBG(DATA, ul_debugobj(data, "open: %s", data->name));
+		data->fd = open(data->name, O_RDONLY);
+		if (data->fd < 0)
+			return data->fd;
+
+#if defined(POSIX_FADV_SEQUENTIAL) && defined(HAVE_POSIX_FADVISE)
+	        ignore_result( posix_fadvise(data->fd, o, 0, POSIX_FADV_SEQUENTIAL) );
+#endif
+		if (o) {
+			DBG(DATA, ul_debugobj(data, "lseek off=%ju", (uintmax_t) o));
+			lseek(data->fd, o, SEEK_SET);
+		}
+	}
+
+	if (off)
+		*off = o;
+
+	return data->fd;
+}
+
+static void memcmp_reset(struct ul_fileeq *eq, struct ul_fileeq_data *data)
+{
+	/* only intro[] is cached */
+	if (data->nblocks)
+		data->nblocks = 1;
+	/* reset file possition */
+	if (data->fd >= 0)
+		lseek(data->fd, get_cached_offset(eq, data), SEEK_SET);
+	data->is_eof = 0;
+}
+
+static ssize_t read_block(struct ul_fileeq *eq, struct ul_fileeq_data *data,
+				size_t n, unsigned char **block)
+{
+	int fd;
+	off_t off = 0;
+	ssize_t rsz;
+
+	if (data->is_eof || n > eq->blocksmax)
+		return 0;
+
+	fd = get_fd(eq, data, &off);
+	if (fd < 0)
+		return fd;
+
+	DBG(DATA, ul_debugobj(data, " read block off=%ju", (uintmax_t) off));
+
+	*block = get_buffer(eq);
+	if (!*block)
+		return -ENOMEM;
+
+	rsz = read_all(data->fd, (char *) *block, eq->readsiz);
+	if (rsz < 0) {
+		DBG(DATA, ul_debugobj(data, "  read failed"));
+		return rsz;
+	}
+	off += rsz;
+	data->nblocks++;
+
+	if (rsz == 0 || (uint64_t) off >= eq->filesiz) {
+		data->is_eof = 1;
+		ul_fileeq_data_close_file(data);
+	}
+
+	DBG(DATA, ul_debugobj(data, "  read sz=%zu", rsz));
+	return rsz;
+}
+
+#ifdef USE_FILEEQ_CRYPTOAPI
+static ssize_t get_digest(struct ul_fileeq *eq, struct ul_fileeq_data *data,
+				size_t n, unsigned char **block)
+{
+	off_t off = 0;
+	ssize_t rsz;
+	size_t sz;
+	int fd;
+
+	if (n > eq->blocksmax)
+		return 0;
+
+	/* return already cached if alvalable */
+	if (n < get_cached_nblocks(data)) {
+		DBG(DATA, ul_debugobj(data, " digest cached"));
+		assert(data->blocks);
+		*block = data->blocks + (n * eq->method->digsiz);
+		return eq->method->digsiz;
+	}
+
+	if (data->is_eof) {
+		DBG(DATA, ul_debugobj(data, " file EOF"));
+		return 0;
+	}
+
+	/* read new block */
+	fd = get_fd(eq, data, &off);
+	if (fd < 0)
+		return fd;
+
+	DBG(DATA, ul_debugobj(data, " read digest off=%ju", (uintmax_t) off));
+
+	sz = eq->method->digsiz;
+
+	if (!data->blocks) {
+		DBG(DATA, ul_debugobj(data, "  alloc cache %" PRIu64, eq->blocksmax * sz));
+		data->blocks = malloc(eq->blocksmax * sz);
+		if (!data->blocks)
+			return -ENOMEM;
+	}
+
+	assert(n <= eq->blocksmax);
+
+	rsz = sendfile(eq->fd_cip, data->fd, NULL, eq->readsiz);
+	DBG(DATA, ul_debugobj(data, "  sent %zu [%zu wanted] to cipher", rsz, eq->readsiz));
+
+	if (rsz < 0)
+		return rsz;
+
+	off += rsz;
+
+	/* get block digest (note 1st block is data->intro */
+	*block = data->blocks + (n * eq->method->digsiz);
+	rsz = read_all(eq->fd_cip, (char *) *block, sz);
+
+	if (rsz > 0)
+		data->nblocks++;
+	if (rsz == 0 || (uint64_t) off >= eq->filesiz) {
+		data->is_eof = 1;
+		ul_fileeq_data_close_file(data);
+	}
+	DBG(DATA, ul_debugobj(data, "  get %zuB digest", rsz));
+	return rsz;
+}
+#endif
+
+static ssize_t get_intro(struct ul_fileeq *eq, struct ul_fileeq_data *data,
+				unsigned char **block)
+{
+	if (data->nblocks == 0) {
+		int fd = get_fd(eq, data, NULL);
+		ssize_t rsz;
+
+		if (fd < 0)
+			return -1;
+		rsz = read_all(fd, (char *) data->intro, sizeof(data->intro));
+		DBG(DATA, ul_debugobj(data, " read %zu bytes intro", sizeof(data->intro)));
+		if (rsz <= 0)
+			return -1;
+		data->nblocks = 1;
+	}
+
+	DBG(DATA, ul_debugobj(data, " return intro"));
+	*block = data->intro;
+	return sizeof(data->intro);
+}
+
+static ssize_t get_cmp_data(struct ul_fileeq *eq, struct ul_fileeq_data *data,
+				size_t blockno, unsigned char **block)
+{
+	if (blockno == 0)
+		return get_intro(eq, data, block);
+
+	blockno--;
+
+	switch (eq->method->id) {
+	case UL_FILEEQ_MEMCMP:
+		return read_block(eq, data, blockno, block);
+	default:
+		break;
+	}
+#ifdef USE_FILEEQ_CRYPTOAPI
+	return get_digest(eq, data, blockno, block);
+#else
+	return -1;
+#endif
+}
+
+#define CMP(a, b) ((a) > (b) ? 1 : ((a) < (b) ? -1 : 0))
+
+int ul_fileeq(struct ul_fileeq *eq,
+	      struct ul_fileeq_data *a, struct ul_fileeq_data *b)
+{
+	int cmp;
+	size_t n = 0;
+
+	DBG(EQ, ul_debugobj(eq, "--> compare %s %s", a->name, b->name));
+
+	if (eq->method->id == UL_FILEEQ_MEMCMP) {
+		memcmp_reset(eq, a);
+		memcmp_reset(eq, b);
+	}
+
+	do {
+		unsigned char *da, *db;
+		ssize_t ca, cb;
+
+		DBG(EQ, ul_debugobj(eq, "compare block #%zu", n));
+
+		ca = get_cmp_data(eq, a, n, &da);
+		if (ca < 0)
+			goto done;
+		cb = get_cmp_data(eq, b, n, &db);
+		if (cb < 0)
+			goto done;
+		if (ca != cb || ca == 0) {
+			cmp = CMP(ca, cb);
+			break;
+
+		}
+		cmp = memcmp(da, db, ca);
+		DBG(EQ, ul_debugobj(eq, "#%zu=%s", n, cmp == 0 ? "match" : "not-match"));
+		n++;
+	} while (cmp == 0);
+
+	if (cmp == 0) {
+		if (!a->is_eof || !b->is_eof)
+			goto done; /* filesize chnaged? */
+
+		DBG(EQ, ul_debugobj(eq, "<-- MATCH"));
+		return 1;
+	}
+done:
+	DBG(EQ, ul_debugobj(eq, " <-- NOT-MATCH"));
+	return 0;
+}
+
+#ifdef TEST_PROGRAM_FILEEQ
+# include <getopt.h>
+# include <err.h>
+
+int main(int argc, char *argv[])
+{
+	struct ul_fileeq eq;
+	struct ul_fileeq_data a, b, c;
+	const char *method = "sha1";
+	static const struct option longopts[] = {
+		{ "method", required_argument, NULL, 'm' },
+		{ "help", no_argument, NULL, 'h' },
+		{ NULL, 0, NULL, 0 }
+	};
+	int ch, rc;
+	const char *file_a = NULL, *file_b = NULL, *file_c = NULL;
+	struct stat st_a, st_b, st_c;
+
+	while ((ch = getopt_long(argc, argv, "m:", longopts, NULL)) != -1) {
+		switch (ch) {
+		case 'm':
+			method = optarg;
+			break;
+		case 'h':
+			printf("usage: %s [options] <file> <file>\n"
+				" -m, --method <memcmp|sha1|crc32>    compare method\n",
+				program_invocation_short_name);
+			return EXIT_FAILURE;
+		}
+	}
+
+	if (optind < argc)
+		file_a = argv[optind++];
+	if (optind < argc)
+		file_b = argv[optind++];
+	if (optind < argc)
+		file_c = argv[optind++];
+
+	if (!file_a || !file_b)
+		errx(EXIT_FAILURE, "no files specified, see --help");
+
+	if (stat(file_a, &st_a) != 0 || !S_ISREG(st_a.st_mode))
+		errx(EXIT_FAILURE, "%s: wrong file", file_a);
+	if (stat(file_b, &st_b) != 0 || !S_ISREG(st_b.st_mode))
+		errx(EXIT_FAILURE, "%s: wrong file", file_b);
+	if (file_c && (stat(file_c, &st_c) != 0 || !S_ISREG(st_c.st_mode)))
+		errx(EXIT_FAILURE, "%s: wrong file", file_c);
+
+
+	if (st_a.st_size != st_b.st_size ||
+	    (file_c && st_a.st_size != st_c.st_size))
+		errx(EXIT_FAILURE, "size of the files does not match");
+
+
+	rc = ul_fileeq_init(&eq, method);
+	if (rc != 0 && strcmp(method, "memcmp") != 0) {
+		method = "memcmp";
+		rc = ul_fileeq_init(&eq, method);
+	}
+	if (rc < 0)
+		err(EXIT_FAILURE, "failed to initialize files comparior");
+
+	ul_fileeq_data_set_file(&a, file_a);
+	ul_fileeq_data_set_file(&b, file_b);
+
+	/* 3rd is optional */
+	if (file_c)
+		ul_fileeq_data_set_file(&c, file_c);
+
+	/*                     filesiz,      readsiz,   memsiz */
+	ul_fileeq_set_size(&eq, st_a.st_size, 1024*1024, 4*1024);
+
+	rc = ul_fileeq(&eq, &a, &b);
+
+	printf("1st vs. 2nd: %s\n", rc == 1 ? "MATCH" : "NOT-MATCH");
+	if (file_c) {
+		rc = ul_fileeq(&eq, &a, &c);
+		printf("1st vs. 3rd: %s\n", rc == 1 ? "MATCH" : "NOT-MATCH");
+
+		rc = ul_fileeq(&eq, &b, &c);
+		printf("2st vs. 3rd: %s\n", rc == 1 ? "MATCH" : "NOT-MATCH");
+	}
+
+	ul_fileeq_data_deinit(&a);
+	ul_fileeq_data_deinit(&b);
+
+	if (file_c)
+		ul_fileeq_data_deinit(&c);
+
+	ul_fileeq_deinit(&eq);
+	return EXIT_FAILURE;
+}
+#endif /* TEST_PROGRAM_FILEEQ */
diff --git a/lib/fileutils.c b/lib/fileutils.c
new file mode 100644
index 0000000..7779e10
--- /dev/null
+++ b/lib/fileutils.c
@@ -0,0 +1,313 @@
+/*
+ * This code is in the public domain; do with it what you wish.
+ *
+ * Copyright (C) 2012 Sami Kerola <kerolasa@iki.fi>
+ * Copyright (C) 2012-2020 Karel Zak <kzak@redhat.com>
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <string.h>
+
+#include "c.h"
+#include "all-io.h"
+#include "fileutils.h"
+#include "pathnames.h"
+
+int mkstemp_cloexec(char *template)
+{
+#ifdef HAVE_MKOSTEMP
+	return mkostemp(template, O_RDWR|O_CREAT|O_EXCL|O_CLOEXEC);
+#else
+	int fd, old_flags, errno_save;
+
+	fd = mkstemp(template);
+	if (fd < 0)
+		return fd;
+
+	old_flags = fcntl(fd, F_GETFD, 0);
+	if (old_flags < 0)
+		goto unwind;
+	if (fcntl(fd, F_SETFD, old_flags | O_CLOEXEC) < 0)
+		goto unwind;
+
+	return fd;
+
+unwind:
+	errno_save = errno;
+	unlink(template);
+	close(fd);
+	errno = errno_save;
+
+	return -1;
+#endif
+}
+
+/* Create open temporary file in safe way.  Please notice that the
+ * file permissions are -rw------- by default. */
+int xmkstemp(char **tmpname, const char *dir, const char *prefix)
+{
+	char *localtmp;
+	const char *tmpenv;
+	mode_t old_mode;
+	int fd, rc;
+
+	/* Some use cases must be capable of being moved atomically
+	 * with rename(2), which is the reason why dir is here.  */
+	tmpenv = dir ? dir : getenv("TMPDIR");
+	if (!tmpenv)
+		tmpenv = _PATH_TMP;
+
+	rc = asprintf(&localtmp, "%s/%s.XXXXXX", tmpenv, prefix);
+	if (rc < 0)
+		return -1;
+
+	old_mode = umask(077);
+	fd = mkstemp_cloexec(localtmp);
+	umask(old_mode);
+	if (fd == -1) {
+		free(localtmp);
+		localtmp = NULL;
+	}
+	*tmpname = localtmp;
+	return fd;
+}
+
+#ifdef F_DUPFD_CLOEXEC
+int dup_fd_cloexec(int oldfd, int lowfd)
+#else
+int dup_fd_cloexec(int oldfd, int lowfd  __attribute__((__unused__)))
+#endif
+{
+	int fd, flags, errno_save;
+
+#ifdef F_DUPFD_CLOEXEC
+	fd = fcntl(oldfd, F_DUPFD_CLOEXEC, lowfd);
+	if (fd >= 0)
+		return fd;
+#endif
+
+	fd = dup(oldfd);
+	if (fd < 0)
+		return fd;
+
+	flags = fcntl(fd, F_GETFD);
+	if (flags < 0)
+		goto unwind;
+	if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) < 0)
+		goto unwind;
+
+	return fd;
+
+unwind:
+	errno_save = errno;
+	close(fd);
+	errno = errno_save;
+
+	return -1;
+}
+
+/*
+ * portable getdtablesize()
+ */
+unsigned int get_fd_tabsize(void)
+{
+	int m;
+
+#if defined(HAVE_GETDTABLESIZE)
+	m = getdtablesize();
+#elif defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
+	struct rlimit rl;
+
+	getrlimit(RLIMIT_NOFILE, &rl);
+	m = rl.rlim_cur;
+#elif defined(HAVE_SYSCONF) && defined(_SC_OPEN_MAX)
+	m = sysconf(_SC_OPEN_MAX);
+#else
+	m = OPEN_MAX;
+#endif
+	return m;
+}
+
+void ul_close_all_fds(unsigned int first, unsigned int last)
+{
+	struct dirent *d;
+	DIR *dir;
+
+	dir = opendir(_PATH_PROC_FDDIR);
+	if (dir) {
+		while ((d = xreaddir(dir))) {
+			char *end;
+			unsigned int fd;
+			int dfd;
+
+			errno = 0;
+			fd = strtoul(d->d_name, &end, 10);
+
+			if (errno || end == d->d_name || !end || *end)
+				continue;
+			dfd = dirfd(dir);
+			if (dfd < 0)
+				continue;
+			if ((unsigned int)dfd == fd)
+				continue;
+			if (fd < first || last < fd)
+				continue;
+			close(fd);
+		}
+		closedir(dir);
+	} else {
+		unsigned fd, tbsz = get_fd_tabsize();
+
+		for (fd = 0; fd < tbsz; fd++) {
+			if (first <= fd && fd <= last)
+				close(fd);
+		}
+	}
+}
+
+#ifdef TEST_PROGRAM_FILEUTILS
+int main(int argc, char *argv[])
+{
+	if (argc < 2)
+		errx(EXIT_FAILURE, "Usage %s --{mkstemp,close-fds,copy-file}", argv[0]);
+
+	if (strcmp(argv[1], "--mkstemp") == 0) {
+		FILE *f;
+		char *tmpname = NULL;
+
+		f = xfmkstemp(&tmpname, NULL, "test");
+		unlink(tmpname);
+		free(tmpname);
+		fclose(f);
+
+	} else if (strcmp(argv[1], "--close-fds") == 0) {
+		ignore_result( dup(STDIN_FILENO) );
+		ignore_result( dup(STDIN_FILENO) );
+		ignore_result( dup(STDIN_FILENO) );
+
+# ifdef HAVE_CLOSE_RANGE
+		if (close_range(STDERR_FILENO + 1, ~0U, 0) < 0)
+# endif
+			ul_close_all_fds(STDERR_FILENO + 1, ~0U);
+
+	} else if (strcmp(argv[1], "--copy-file") == 0) {
+		int ret = ul_copy_file(STDIN_FILENO, STDOUT_FILENO);
+		if (ret == UL_COPY_READ_ERROR)
+			err(EXIT_FAILURE, "read");
+		else if (ret == UL_COPY_WRITE_ERROR)
+			err(EXIT_FAILURE, "write");
+	}
+	return EXIT_SUCCESS;
+}
+#endif
+
+
+int ul_mkdir_p(const char *path, mode_t mode)
+{
+	char *p, *dir;
+	int rc = 0;
+
+	if (!path || !*path)
+		return -EINVAL;
+
+	dir = p = strdup(path);
+	if (!dir)
+		return -ENOMEM;
+
+	if (*p == '/')
+		p++;
+
+	while (p && *p) {
+		char *e = strchr(p, '/');
+		if (e)
+			*e = '\0';
+		if (*p) {
+			rc = mkdir(dir, mode);
+			if (rc && errno != EEXIST)
+				break;
+			rc = 0;
+		}
+		if (!e)
+			break;
+		*e = '/';
+		p = e + 1;
+	}
+
+	free(dir);
+	return rc;
+}
+
+/* returns basename and keeps dirname in the @path, if @path is "/" (root)
+ * then returns empty string */
+char *stripoff_last_component(char *path)
+{
+	char *p = path ? strrchr(path, '/') : NULL;
+
+	if (!p)
+		return NULL;
+	*p = '\0';
+	return p + 1;
+}
+
+static int copy_file_simple(int from, int to)
+{
+	ssize_t nr;
+	char buf[BUFSIZ];
+
+	while ((nr = read_all(from, buf, sizeof(buf))) > 0)
+		if (write_all(to, buf, nr) == -1)
+			return UL_COPY_WRITE_ERROR;
+	if (nr < 0)
+		return UL_COPY_READ_ERROR;
+#ifdef HAVE_EXPLICIT_BZERO
+	explicit_bzero(buf, sizeof(buf));
+#endif
+	return 0;
+}
+
+/* Copies the contents of a file. Returns -1 on read error, -2 on write error. */
+int ul_copy_file(int from, int to)
+{
+#ifdef HAVE_SENDFILE
+	struct stat st;
+	ssize_t nw;
+
+	if (fstat(from, &st) == -1)
+		return UL_COPY_READ_ERROR;
+	if (!S_ISREG(st.st_mode))
+		return copy_file_simple(from, to);
+	if (sendfile_all(to, from, NULL, st.st_size) < 0)
+		return copy_file_simple(from, to);
+	/* ensure we either get an EOF or an error */
+	while ((nw = sendfile_all(to, from, NULL, 16*1024*1024)) != 0)
+		if (nw < 0)
+			return copy_file_simple(from, to);
+	return 0;
+#else
+	return copy_file_simple(from, to);
+#endif
+}
+
+int ul_reopen(int fd, int flags)
+{
+	ssize_t ssz;
+	char buf[PATH_MAX];
+	char fdpath[ sizeof(_PATH_PROC_FDDIR) + sizeof(stringify_value(INT_MAX)) ];
+
+	snprintf(fdpath, sizeof(fdpath), _PATH_PROC_FDDIR "/%d", fd);
+
+	ssz = readlink(fdpath, buf, sizeof(buf) - 1);
+	if (ssz < 0)
+		return -errno;
+
+	assert(ssz > 0);
+
+	buf[ssz] = '\0';
+
+	return open(buf, flags);
+}
diff --git a/lib/idcache.c b/lib/idcache.c
new file mode 100644
index 0000000..fa77e7b
--- /dev/null
+++ b/lib/idcache.c
@@ -0,0 +1,125 @@
+/*
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Written by Karel Zak <kzak@redhat.com>
+ */
+#include <wchar.h>
+#include <pwd.h>
+#include <grp.h>
+#include <sys/types.h>
+
+#include "c.h"
+#include "idcache.h"
+
+struct identry *get_id(struct idcache *ic, unsigned long int id)
+{
+	struct identry *ent;
+
+	if (!ic)
+		return NULL;
+
+	for (ent = ic->ent; ent; ent = ent->next) {
+		if (ent->id == id)
+			return ent;
+	}
+
+	return NULL;
+}
+
+struct idcache *new_idcache(void)
+{
+	return calloc(1, sizeof(struct idcache));
+}
+
+void free_idcache(struct idcache *ic)
+{
+	struct identry *ent;
+
+	if (!ic)
+		return;
+
+	ent = ic->ent;
+
+	while (ent) {
+		struct identry *next = ent->next;
+		free(ent->name);
+		free(ent);
+		ent = next;
+	}
+
+	free(ic);
+}
+
+static void add_id(struct idcache *ic, char *name, unsigned long int id)
+{
+	struct identry *ent, *x;
+	int w = 0;
+
+	if (!ic)
+		return;
+
+	ent = calloc(1, sizeof(struct identry));
+	if (!ent)
+		return;
+	ent->id = id;
+
+	if (name) {
+#ifdef HAVE_WIDECHAR
+		wchar_t wc[LOGIN_NAME_MAX + 1];
+
+		if (mbstowcs(wc, name, LOGIN_NAME_MAX) > 0) {
+			wc[LOGIN_NAME_MAX] = '\0';
+			w = wcswidth(wc, LOGIN_NAME_MAX);
+		}
+		else
+#endif
+			w = strlen(name);
+	}
+
+	/* note, we ignore names with non-printable widechars */
+	if (w > 0) {
+		ent->name = strdup(name);
+		if (!ent->name) {
+			free(ent);
+			return;
+		}
+	} else {
+		if (asprintf(&ent->name, "%lu", id) < 0) {
+			free(ent);
+			return;
+		}
+	}
+
+	for (x = ic->ent; x && x->next; x = x->next);
+
+	if (x)
+		x->next = ent;
+	else
+		ic->ent = ent;
+
+	if (w <= 0)
+		w = ent->name ? strlen(ent->name) : 0;
+	ic->width = ic->width < w ? w : ic->width;
+}
+
+void add_uid(struct idcache *cache, unsigned long int id)
+{
+	struct identry *ent = get_id(cache, id);
+
+	if (!ent) {
+		struct passwd *pw = getpwuid((uid_t) id);
+		add_id(cache, pw ? pw->pw_name : NULL, id);
+	}
+}
+
+void add_gid(struct idcache *cache, unsigned long int id)
+{
+	struct identry *ent = get_id(cache, id);
+
+	if (!ent) {
+		struct group *gr = getgrgid((gid_t) id);
+		add_id(cache, gr ? gr->gr_name : NULL, id);
+	}
+}
+
diff --git a/lib/ismounted.c b/lib/ismounted.c
new file mode 100644
index 0000000..31be71a
--- /dev/null
+++ b/lib/ismounted.c
@@ -0,0 +1,396 @@
+/*
+ * ismounted.c --- Check to see if the filesystem was mounted
+ *
+ * Copyright (C) 1995,1996,1997,1998,1999,2000,2008 Theodore Ts'o.
+ *
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
+ */
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <fcntl.h>
+#ifdef HAVE_MNTENT_H
+#include <mntent.h>
+#endif
+#include <string.h>
+#include <sys/stat.h>
+#include <ctype.h>
+#include <sys/param.h>
+
+#ifndef __linux__
+# ifdef HAVE_SYS_UCRED_H
+#  include <sys/ucred.h>
+# endif
+# ifdef HAVE_SYS_MOUNT_H
+#  include <sys/mount.h>
+# endif
+#endif
+
+#include "pathnames.h"
+#include "strutils.h"
+#include "ismounted.h"
+#include "c.h"
+#ifdef __linux__
+# include "loopdev.h"
+#endif
+
+
+
+#ifdef HAVE_MNTENT_H
+/*
+ * Helper function which checks a file in /etc/mtab format to see if a
+ * filesystem is mounted.  Returns an error if the file doesn't exist
+ * or can't be opened.
+ */
+static int check_mntent_file(const char *mtab_file, const char *file,
+				   int *mount_flags, char *mtpt, int mtlen)
+{
+	struct mntent	*mnt;
+	struct stat	st_buf;
+	int		retval = 0;
+	dev_t		file_dev=0, file_rdev=0;
+	ino_t		file_ino=0;
+	FILE		*f;
+	int		fd;
+
+	*mount_flags = 0;
+	if ((f = setmntent (mtab_file, "r")) == NULL)
+		return errno;
+
+	if (stat(file, &st_buf) == 0) {
+		if (S_ISBLK(st_buf.st_mode)) {
+#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
+			file_rdev = st_buf.st_rdev;
+#endif	/* __GNU__ */
+		} else {
+			file_dev = st_buf.st_dev;
+			file_ino = st_buf.st_ino;
+		}
+	}
+
+	while ((mnt = getmntent (f)) != NULL) {
+		if (mnt->mnt_fsname[0] != '/')
+			continue;
+		if (strcmp(file, mnt->mnt_fsname) == 0)
+			break;
+		if (stat(mnt->mnt_fsname, &st_buf) != 0)
+			continue;
+
+		if (S_ISBLK(st_buf.st_mode)) {
+#ifndef __GNU__
+			if (file_rdev && file_rdev == st_buf.st_rdev)
+				break;
+#ifdef __linux__
+			/* maybe the file is loopdev backing file */
+			if (file_dev
+			    && major(st_buf.st_rdev) == LOOPDEV_MAJOR
+			    && loopdev_is_used(mnt->mnt_fsname, file, 0, 0, 0))
+				break;
+#endif /* __linux__ */
+#endif	/* __GNU__ */
+		} else {
+			if (file_dev && ((file_dev == st_buf.st_dev) &&
+					 (file_ino == st_buf.st_ino)))
+				break;
+		}
+	}
+
+	if (mnt == NULL) {
+#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
+		/*
+		 * Do an extra check to see if this is the root device.  We
+		 * can't trust /etc/mtab, and /proc/mounts will only list
+		 * /dev/root for the root filesystem.  Argh.  Instead we
+		 * check if the given device has the same major/minor number
+		 * as the device that the root directory is on.
+		 */
+		if (file_rdev && stat("/", &st_buf) == 0 &&
+		    st_buf.st_dev == file_rdev) {
+			*mount_flags = MF_MOUNTED;
+			if (mtpt)
+				xstrncpy(mtpt, "/", mtlen);
+			goto is_root;
+		}
+#endif	/* __GNU__ */
+		goto errout;
+	}
+#ifndef __GNU__ /* The GNU hurd is deficient; what else is new? */
+	/* Validate the entry in case /etc/mtab is out of date */
+	/*
+	 * We need to be paranoid, because some broken distributions
+	 * (read: Slackware) don't initialize /etc/mtab before checking
+	 * all of the non-root filesystems on the disk.
+	 */
+	if (stat(mnt->mnt_dir, &st_buf) < 0) {
+		retval = errno;
+		if (retval == ENOENT) {
+#ifdef DEBUG
+			printf("Bogus entry in %s!  (%s does not exist)\n",
+			       mtab_file, mnt->mnt_dir);
+#endif /* DEBUG */
+			retval = 0;
+		}
+		goto errout;
+	}
+	if (file_rdev && (st_buf.st_dev != file_rdev)) {
+#ifdef DEBUG
+		printf("Bogus entry in %s!  (%s not mounted on %s)\n",
+		       mtab_file, file, mnt->mnt_dir);
+#endif /* DEBUG */
+		goto errout;
+	}
+#endif /* __GNU__ */
+	*mount_flags = MF_MOUNTED;
+
+#ifdef MNTOPT_RO
+	/* Check to see if the ro option is set */
+	if (hasmntopt(mnt, MNTOPT_RO))
+		*mount_flags |= MF_READONLY;
+#endif
+
+	if (mtpt)
+		xstrncpy(mtpt, mnt->mnt_dir, mtlen);
+	/*
+	 * Check to see if we're referring to the root filesystem.
+	 * If so, do a manual check to see if we can open /etc/mtab
+	 * read/write, since if the root is mounted read/only, the
+	 * contents of /etc/mtab may not be accurate.
+	 */
+	if (!strcmp(mnt->mnt_dir, "/")) {
+is_root:
+#define TEST_FILE "/.ismount-test-file"
+		*mount_flags |= MF_ISROOT;
+		fd = open(TEST_FILE, O_RDWR|O_CREAT|O_CLOEXEC, 0600);
+		if (fd < 0) {
+			if (errno == EROFS)
+				*mount_flags |= MF_READONLY;
+		} else
+			close(fd);
+		(void) unlink(TEST_FILE);
+	}
+	retval = 0;
+errout:
+	endmntent (f);
+	return retval;
+}
+
+static int check_mntent(const char *file, int *mount_flags,
+			      char *mtpt, int mtlen)
+{
+	int	retval;
+
+#ifdef DEBUG
+	retval = check_mntent_file("/tmp/mtab", file, mount_flags,
+				   mtpt, mtlen);
+	if (retval == 0)
+		return 0;
+#endif /* DEBUG */
+#ifdef __linux__
+	retval = check_mntent_file("/proc/mounts", file, mount_flags,
+				   mtpt, mtlen);
+	if (retval == 0 && (*mount_flags != 0))
+		return 0;
+	if (access("/proc/mounts", R_OK) == 0) {
+		*mount_flags = 0;
+		return retval;
+	}
+#endif /* __linux__ */
+#if defined(MOUNTED) || defined(_PATH_MOUNTED)
+#ifndef MOUNTED
+#define MOUNTED _PATH_MOUNTED
+#endif /* MOUNTED */
+	retval = check_mntent_file(MOUNTED, file, mount_flags, mtpt, mtlen);
+	return retval;
+#else
+	*mount_flags = 0;
+	return 0;
+#endif /* defined(MOUNTED) || defined(_PATH_MOUNTED) */
+}
+
+#else
+#if defined(HAVE_GETMNTINFO)
+
+static int check_getmntinfo(const char *file, int *mount_flags,
+				  char *mtpt, int mtlen)
+{
+	struct statfs *mp;
+        int    len, n;
+        const  char   *s1;
+	char	*s2;
+
+        n = getmntinfo(&mp, MNT_NOWAIT);
+        if (n == 0)
+		return errno;
+
+        len = sizeof(_PATH_DEV) - 1;
+        s1 = file;
+        if (strncmp(_PATH_DEV, s1, len) == 0)
+                s1 += len;
+
+	*mount_flags = 0;
+        while (--n >= 0) {
+                s2 = mp->f_mntfromname;
+                if (strncmp(_PATH_DEV, s2, len) == 0) {
+                        s2 += len - 1;
+                        *s2 = 'r';
+                }
+                if (strcmp(s1, s2) == 0 || strcmp(s1, &s2[1]) == 0) {
+			*mount_flags = MF_MOUNTED;
+			break;
+		}
+                ++mp;
+	}
+	if (mtpt && n >= 0)
+		xstrncpy(mtpt, mp->f_mntonname, mtlen);
+	return 0;
+}
+#endif /* HAVE_GETMNTINFO */
+#endif /* HAVE_MNTENT_H */
+
+/*
+ * Check to see if we're dealing with the swap device.
+ */
+static int is_swap_device(const char *file)
+{
+	FILE		*f;
+	char		buf[1024], *cp;
+	dev_t		file_dev;
+	struct stat	st_buf;
+	int		ret = 0;
+
+	file_dev = 0;
+#ifndef __GNU__ /* The GNU hurd is broken with respect to stat devices */
+	if ((stat(file, &st_buf) == 0) &&
+	    S_ISBLK(st_buf.st_mode))
+		file_dev = st_buf.st_rdev;
+#endif	/* __GNU__ */
+
+	if (!(f = fopen("/proc/swaps", "r" UL_CLOEXECSTR)))
+		return 0;
+	/* Skip the first line */
+	if (!fgets(buf, sizeof(buf), f))
+		goto leave;
+	if (*buf && strncmp(buf, "Filename\t", 9) != 0)
+		/* Linux <=2.6.19 contained a bug in the /proc/swaps
+		 * code where the header would not be displayed
+		 */
+		goto valid_first_line;
+
+	while (fgets(buf, sizeof(buf), f)) {
+valid_first_line:
+		if ((cp = strchr(buf, ' ')) != NULL)
+			*cp = 0;
+		if ((cp = strchr(buf, '\t')) != NULL)
+			*cp = 0;
+		if (strcmp(buf, file) == 0) {
+			ret++;
+			break;
+		}
+#ifndef __GNU__
+		if (file_dev && (stat(buf, &st_buf) == 0) &&
+		    S_ISBLK(st_buf.st_mode) &&
+		    file_dev == st_buf.st_rdev) {
+			ret++;
+			break;
+		}
+#endif	/* __GNU__ */
+	}
+
+leave:
+	fclose(f);
+	return ret;
+}
+
+
+/*
+ * check_mount_point() determines if the device is mounted or otherwise
+ * busy, and fills in mount_flags with one or more of the following flags:
+ * MF_MOUNTED, MF_ISROOT, MF_READONLY, MF_SWAP, and MF_BUSY.  If mtpt is
+ * non-NULL, the directory where the device is mounted is copied to where mtpt
+ * is pointing, up to mtlen characters.
+ */
+#ifdef __TURBOC__
+ #pragma argsused
+#endif
+int check_mount_point(const char *device, int *mount_flags,
+				  char *mtpt, int mtlen)
+{
+	int	retval = 0;
+
+	if (is_swap_device(device)) {
+		*mount_flags = MF_MOUNTED | MF_SWAP;
+		if (mtpt && mtlen)
+			xstrncpy(mtpt, "[SWAP]", mtlen);
+	} else {
+#ifdef HAVE_MNTENT_H
+		retval = check_mntent(device, mount_flags, mtpt, mtlen);
+#else
+#ifdef HAVE_GETMNTINFO
+		retval = check_getmntinfo(device, mount_flags, mtpt, mtlen);
+#else
+#ifdef __GNUC__
+ #warning "Can't use getmntent or getmntinfo to check for mounted filesystems!"
+#endif
+		*mount_flags = 0;
+#endif /* HAVE_GETMNTINFO */
+#endif /* HAVE_MNTENT_H */
+	}
+	if (retval)
+		return retval;
+
+#ifdef __linux__ /* This only works on Linux 2.6+ systems */
+	{
+		struct stat st_buf;
+		int fd;
+		if ((stat(device, &st_buf) != 0) ||
+		    !S_ISBLK(st_buf.st_mode))
+			return 0;
+		fd = open(device, O_RDONLY|O_EXCL|O_CLOEXEC|O_NONBLOCK);
+		if (fd < 0) {
+			if (errno == EBUSY)
+				*mount_flags |= MF_BUSY;
+		} else
+			close(fd);
+	}
+#endif
+
+	return 0;
+}
+
+int is_mounted(const char *file)
+{
+	int	retval;
+	int	mount_flags = 0;
+
+	retval = check_mount_point(file, &mount_flags, NULL, 0);
+	if (retval)
+		return 0;
+	return mount_flags & MF_MOUNTED;
+}
+
+#ifdef TEST_PROGRAM_ISMOUNTED
+int main(int argc, char **argv)
+{
+	int flags = 0;
+	char devname[PATH_MAX];
+
+	if (argc < 2) {
+		fprintf(stderr, "Usage: %s device\n", argv[0]);
+		return EXIT_FAILURE;
+	}
+
+	if (check_mount_point(argv[1], &flags, devname, sizeof(devname)) == 0 &&
+	    (flags & MF_MOUNTED)) {
+		if (flags & MF_SWAP)
+			printf("used swap device\n");
+		else
+			printf("mounted on %s\n", devname);
+		return EXIT_SUCCESS;
+	}
+
+	printf("not mounted\n");
+	return EXIT_FAILURE;
+}
+#endif /* DEBUG */
diff --git a/lib/jsonwrt.c b/lib/jsonwrt.c
new file mode 100644
index 0000000..8ca1d4d
--- /dev/null
+++ b/lib/jsonwrt.c
@@ -0,0 +1,229 @@
+/*
+ * JSON output formatting functions.
+ *
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Written by Karel Zak <kzak@redhat.com>
+ */
+#include <stdio.h>
+#include <inttypes.h>
+#include <ctype.h>
+#include <cctype.h>
+
+#include "c.h"
+#include "jsonwrt.h"
+
+/*
+ * Requirements enumerated via testing (V8, Firefox, IE11):
+ *
+ * var charsToEscape = [];
+ * for (var i = 0; i < 65535; i += 1) {
+ *	try {
+ *		JSON.parse('{"sample": "' + String.fromCodePoint(i) + '"}');
+ *	} catch (e) {
+ *		charsToEscape.push(i);
+ *	}
+ * }
+ */
+static void fputs_quoted_case_json(const char *data, FILE *out, int dir)
+{
+	const char *p;
+
+	fputc('"', out);
+	for (p = data; p && *p; p++) {
+
+		const unsigned int c = (unsigned int) *p;
+
+		/* From http://www.json.org
+		 *
+		 * The double-quote and backslashes would break out a string or
+		 * init an escape sequence if not escaped.
+		 *
+		 * Note that single-quotes and forward slashes, while they're
+		 * in the JSON spec, don't break double-quoted strings.
+		 */
+		if (c == '"' || c == '\\') {
+			fputc('\\', out);
+			fputc(c, out);
+			continue;
+		}
+
+		/* All non-control characters OK; do the case swap as required. */
+		if (c >= 0x20) {
+			/*
+			 * Don't use locale sensitive ctype.h functions for regular
+			 * ASCII chars, because for example with Turkish locale
+			 * (aka LANG=tr_TR.UTF-8) toupper('I') returns 'I'.
+			 */
+			if (c <= 127)
+				fputc(dir ==  1 ? c_toupper(c) :
+				      dir == -1 ? c_tolower(c) : *p, out);
+			else
+				fputc(dir ==  1 ? toupper(c) :
+				      dir == -1 ? tolower(c) : *p, out);
+			continue;
+		}
+
+		/* In addition, all chars under ' ' break Node's/V8/Chrome's, and
+		 * Firefox's JSON.parse function
+		 */
+		switch (c) {
+			/* Handle short-hand cases to reduce output size.  C
+			 * has most of the same stuff here, so if there's an
+			 * "Escape for C" function somewhere in the STL, we
+			 * should probably be using it.
+			 */
+			case '\b':
+				fputs("\\b", out);
+				break;
+			case '\t':
+				fputs("\\t", out);
+				break;
+			case '\n':
+				fputs("\\n", out);
+				break;
+			case '\f':
+				fputs("\\f", out);
+				break;
+			case '\r':
+				fputs("\\r", out);
+				break;
+			default:
+				/* Other assorted control characters */
+				fprintf(out, "\\u00%02x", c);
+				break;
+		}
+	}
+	fputc('"', out);
+}
+
+#define fputs_quoted_json(_d, _o)       fputs_quoted_case_json(_d, _o, 0)
+#define fputs_quoted_json_upper(_d, _o) fputs_quoted_case_json(_d, _o, 1)
+#define fputs_quoted_json_lower(_d, _o) fputs_quoted_case_json(_d, _o, -1)
+
+void ul_jsonwrt_init(struct ul_jsonwrt *fmt, FILE *out, int indent)
+{
+	fmt->out = out;
+	fmt->indent = indent;
+	fmt->after_close = 0;
+}
+
+int ul_jsonwrt_is_ready(struct ul_jsonwrt *fmt)
+{
+	return fmt->out == NULL ? 0 : 1;
+}
+
+void ul_jsonwrt_indent(struct ul_jsonwrt *fmt)
+{
+	int i;
+
+	for (i = 0; i < fmt->indent; i++)
+		fputs("   ", fmt->out);
+}
+
+void ul_jsonwrt_open(struct ul_jsonwrt *fmt, const char *name, int type)
+{
+	if (name) {
+		if (fmt->after_close)
+			fputs(",\n", fmt->out);
+		ul_jsonwrt_indent(fmt);
+		fputs_quoted_json_lower(name, fmt->out);
+	} else {
+		if (fmt->after_close)
+			fputs(",", fmt->out);
+		else
+			ul_jsonwrt_indent(fmt);
+	}
+
+	switch (type) {
+	case UL_JSON_OBJECT:
+		fputs(name ? ": {\n" : "{\n", fmt->out);
+		fmt->indent++;
+		break;
+	case UL_JSON_ARRAY:
+		fputs(name ? ": [\n" : "[\n", fmt->out);
+		fmt->indent++;
+		break;
+	case UL_JSON_VALUE:
+		fputs(name ? ": " : " ", fmt->out);
+		break;
+	}
+	fmt->after_close = 0;
+}
+
+void ul_jsonwrt_close(struct ul_jsonwrt *fmt, int type)
+{
+	if (fmt->indent == 1) {
+		fputs("\n}\n", fmt->out);
+		fmt->indent--;
+		fmt->after_close = 1;
+		return;
+	}
+	assert(fmt->indent > 0);
+
+	switch (type) {
+	case UL_JSON_OBJECT:
+		fmt->indent--;
+		fputc('\n', fmt->out);
+		ul_jsonwrt_indent(fmt);
+		fputs("}", fmt->out);
+		break;
+	case UL_JSON_ARRAY:
+		fmt->indent--;
+		fputc('\n', fmt->out);
+		ul_jsonwrt_indent(fmt);
+		fputs("]", fmt->out);
+		break;
+	case UL_JSON_VALUE:
+		break;
+	}
+
+	fmt->after_close = 1;
+}
+
+void ul_jsonwrt_value_raw(struct ul_jsonwrt *fmt,
+			const char *name, const char *data)
+{
+	ul_jsonwrt_value_open(fmt, name);
+	if (data && *data)
+		fputs(data, fmt->out);
+	else
+		fputs("null", fmt->out);
+	ul_jsonwrt_value_close(fmt);
+}
+
+void ul_jsonwrt_value_s(struct ul_jsonwrt *fmt,
+			const char *name, const char *data)
+{
+	ul_jsonwrt_value_open(fmt, name);
+	if (data && *data)
+		fputs_quoted_json(data, fmt->out);
+	else
+		fputs("null", fmt->out);
+	ul_jsonwrt_value_close(fmt);
+}
+
+void ul_jsonwrt_value_u64(struct ul_jsonwrt *fmt,
+			const char *name, uint64_t data)
+{
+	ul_jsonwrt_value_open(fmt, name);
+	fprintf(fmt->out, "%"PRIu64, data);
+	ul_jsonwrt_value_close(fmt);
+}
+
+void ul_jsonwrt_value_boolean(struct ul_jsonwrt *fmt,
+			const char *name, int data)
+{
+	ul_jsonwrt_value_open(fmt, name);
+	fputs(data ? "true" : "false", fmt->out);
+	ul_jsonwrt_value_close(fmt);
+}
+
+void ul_jsonwrt_value_null(struct ul_jsonwrt *fmt,
+			const char *name)
+{
+	ul_jsonwrt_value_open(fmt, name);
+	fputs("null", fmt->out);
+	ul_jsonwrt_value_close(fmt);
+}
diff --git a/lib/langinfo.c b/lib/langinfo.c
new file mode 100644
index 0000000..a200085
--- /dev/null
+++ b/lib/langinfo.c
@@ -0,0 +1,124 @@
+/*
+ * This is callback solution for systems without nl_langinfo(), this function
+ * returns hardcoded and on locale setting indepndent value.
+ *
+ * See langinfo.h man page for more details.
+ *
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Copyright (C) 2010 Karel Zak <kzak@redhat.com>
+ */
+#include "nls.h"
+
+char *langinfo_fallback(nl_item item)
+{
+	switch (item) {
+	case CODESET:
+		return "ISO-8859-1";
+	case THOUSEP:
+		return ",";
+	case D_T_FMT:
+	case ERA_D_T_FMT:
+		return "%a %b %e %H:%M:%S %Y";
+	case D_FMT:
+	case ERA_D_FMT:
+		return "%m/%d/%y";
+	case T_FMT:
+	case ERA_T_FMT:
+		return "%H:%M:%S";
+	case T_FMT_AMPM:
+		return "%I:%M:%S %p";
+	case AM_STR:
+		return "AM";
+	case PM_STR:
+		return "PM";
+	case DAY_1:
+		return "Sunday";
+	case DAY_2:
+		return "Monday";
+	case DAY_3:
+		return "Tuesday";
+	case DAY_4:
+		return "Wednesday";
+	case DAY_5:
+		return "Thursday";
+	case DAY_6:
+		return "Friday";
+	case DAY_7:
+		return "Saturday";
+	case ABDAY_1:
+		return "Sun";
+	case ABDAY_2:
+		return "Mon";
+	case ABDAY_3:
+		return "Tue";
+	case ABDAY_4:
+		return "Wed";
+	case ABDAY_5:
+		return "Thu";
+	case ABDAY_6:
+		return "Fri";
+	case ABDAY_7:
+		return "Sat";
+	case MON_1:
+		return "January";
+	case MON_2:
+		return "February";
+	case MON_3:
+		return "March";
+	case MON_4:
+		return "April";
+	case MON_5:
+		return "May";
+	case MON_6:
+		return "June";
+	case MON_7:
+		return "July";
+	case MON_8:
+		return "August";
+	case MON_9:
+		return "September";
+	case MON_10:
+		return "October";
+	case MON_11:
+		return "November";
+	case MON_12:
+		return "December";
+	case ABMON_1:
+		return "Jan";
+	case ABMON_2:
+		return "Feb";
+	case ABMON_3:
+		return "Mar";
+	case ABMON_4:
+		return "Apr";
+	case ABMON_5:
+		return "May";
+	case ABMON_6:
+		return "Jun";
+	case ABMON_7:
+		return "Jul";
+	case ABMON_8:
+		return "Aug";
+	case ABMON_9:
+		return "Sep";
+	case ABMON_10:
+		return "Oct";
+	case ABMON_11:
+		return "Nov";
+	case ABMON_12:
+		return "Dec";
+	case ALT_DIGITS:
+		return "\0\0\0\0\0\0\0\0\0\0";
+	case CRNCYSTR:
+		return "-";
+	case YESEXPR:
+		return "^[yY]";
+	case NOEXPR:
+		return "^[nN]";
+	default:
+		return "";
+	}
+}
+
diff --git a/lib/linux_version.c b/lib/linux_version.c
new file mode 100644
index 0000000..119869e
--- /dev/null
+++ b/lib/linux_version.c
@@ -0,0 +1,75 @@
+/*
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ */
+#include <stdio.h>
+#include <sys/utsname.h>
+
+#include "c.h"
+#include "linux_version.h"
+
+int get_linux_version (void)
+{
+	static int kver = -1;
+	struct utsname uts;
+	int x = 0, y = 0, z = 0;
+	int n;
+
+	if (kver != -1)
+		return kver;
+	if (uname(&uts))
+		return kver = 0;
+
+	n = sscanf(uts.release, "%d.%d.%d", &x, &y, &z);
+	if (n < 1 || n > 3)
+		return kver = 0;
+
+	return kver = KERNEL_VERSION(x, y, z);
+}
+
+#ifdef TEST_PROGRAM_LINUXVERSION
+# include <stdlib.h>
+int main(int argc, char *argv[])
+{
+	int rc = EXIT_FAILURE;
+
+	if (argc == 1) {
+		printf("Linux version: %d\n", get_linux_version());
+		rc = EXIT_SUCCESS;
+
+	} else if (argc == 5) {
+		const char *oper = argv[1];
+
+		int x = atoi(argv[2]),
+		    y = atoi(argv[3]),
+		    z = atoi(argv[4]);
+		int kver = get_linux_version();
+		int uver = KERNEL_VERSION(x, y, z);
+
+		if (strcmp(oper, "==") == 0)
+			rc = kver == uver;
+		else if (strcmp(oper, "<=") == 0)
+			rc = kver <= uver;
+		else if (strcmp(oper, ">=") == 0)
+			rc = kver >= uver;
+		else
+			errx(EXIT_FAILURE, "unsupported operator");
+
+		if (rc)
+			printf("match\n");
+		else
+			printf("not-match [%d %s %d, x.y.z: %d.%d.%d]\n",
+					kver, oper, uver, x, y, z);
+
+		rc = rc ? EXIT_SUCCESS : EXIT_FAILURE;
+
+	} else
+		 fprintf(stderr, "Usage:\n"
+				 "   %s [<oper> <x> <y> <z>]\n"
+				 "supported operators:\n"
+				 "   ==, <=, >=\n",
+				 program_invocation_short_name);
+
+	return rc;
+}
+#endif
diff --git a/lib/logindefs.c b/lib/logindefs.c
new file mode 100644
index 0000000..9563122
--- /dev/null
+++ b/lib/logindefs.c
@@ -0,0 +1,609 @@
+/*
+ * Copyright (C) 2003, 2004, 2005 Thorsten Kukuk
+ * Author: Thorsten Kukuk <kukuk@suse.de>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain any existing copyright
+ *    notice, and this entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ *
+ * 2. Redistributions in binary form must reproduce all prior and current
+ *    copyright notices, this list of conditions, and the following
+ *    disclaimer in the documentation and/or other materials provided
+ *    with the distribution.
+ *
+ * 3. The name of any author may not be used to endorse or promote
+ *    products derived from this software without their specific prior
+ *   written permission.
+ */
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/syslog.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <pwd.h>
+
+#include "c.h"
+#include "closestream.h"
+#include "logindefs.h"
+#include "nls.h"
+#include "pathnames.h"
+#include "xalloc.h"
+
+
+static void (*logindefs_loader)(void *) = NULL;
+static void *logindefs_loader_data = NULL;
+
+void logindefs_set_loader(void (*loader)(void *data), void *data)
+{
+	logindefs_loader = loader;
+	logindefs_loader_data = data;
+}
+
+#ifndef HAVE_LIBECONF
+
+struct item {
+	char *name;		/* name of the option.  */
+	char *value;		/* value of the option.  */
+	char *path;		/* name of config file for this option.  */
+
+	struct item *next;	/* pointer to next option.  */
+};
+
+static struct item *list = NULL;
+
+void free_getlogindefs_data(void)
+{
+	struct item *ptr;
+
+	ptr = list;
+	while (ptr) {
+		struct item *tmp = ptr->next;
+
+		free(ptr->path);
+		free(ptr->name);
+		free(ptr->value);
+		free(ptr);
+		ptr = tmp;
+	}
+
+	list = NULL;
+}
+
+static void store(const char *name, const char *value, const char *path)
+{
+	struct item *new = xmalloc(sizeof(struct item));
+
+	if (!name)
+		abort();
+
+	new->name = xstrdup(name);
+	new->value = value && *value ? xstrdup(value) : NULL;
+	new->path = xstrdup(path);
+	new->next = list;
+	list = new;
+}
+
+void logindefs_load_file(const char *filename)
+{
+	FILE *f;
+	char buf[BUFSIZ];
+
+	f = fopen(filename, "r");
+	if (!f)
+		return;
+
+	while (fgets(buf, sizeof(buf), f)) {
+
+		char *p, *name, *data = NULL;
+
+		if (*buf == '#' || *buf == '\n')
+			continue;	/* only comment or empty line */
+
+		p = strchr(buf, '#');
+		if (p)
+			*p = '\0';
+		else {
+			size_t n = strlen(buf);
+			if (n && *(buf + n - 1) == '\n')
+				*(buf + n - 1) = '\0';
+		}
+
+		if (!*buf)
+			continue;	/* empty line */
+
+		/* ignore space at begin of the line */
+		name = buf;
+		while (*name && isspace((unsigned)*name))
+			name++;
+
+		/* go to the end of the name */
+		data = name;
+		while (*data && !(isspace((unsigned)*data) || *data == '='))
+			data++;
+		if (data > name && *data)
+			*data++ = '\0';
+
+		if (!*name || data == name)
+			continue;
+
+		/* go to the begin of the value */
+		while (*data
+		       && (isspace((unsigned)*data) || *data == '='
+			   || *data == '"'))
+			data++;
+
+		/* remove space at the end of the value */
+		p = data + strlen(data);
+		if (p > data)
+			p--;
+		while (p > data && (isspace((unsigned)*p) || *p == '"'))
+			*p-- = '\0';
+
+		store(name, data, filename);
+	}
+
+	fclose(f);
+}
+
+static void load_defaults(void)
+{
+	if (logindefs_loader)
+		logindefs_loader(logindefs_loader_data);
+	else
+		logindefs_load_file(_PATH_LOGINDEFS);
+}
+
+static struct item *search(const char *name)
+{
+	struct item *ptr;
+
+	if (!list)
+		load_defaults();
+
+	ptr = list;
+	while (ptr != NULL) {
+		if (strcasecmp(name, ptr->name) == 0)
+			return ptr;
+		ptr = ptr->next;
+	}
+
+	return NULL;
+}
+
+static const char *search_config(const char *name)
+{
+	struct item *ptr;
+
+	ptr = list;
+	while (ptr != NULL) {
+		if (strcasecmp(name, ptr->name) == 0)
+			return ptr->path;
+		ptr = ptr->next;
+	}
+
+	return NULL;
+}
+
+int getlogindefs_bool(const char *name, int dflt)
+{
+	struct item *ptr = search(name);
+	return ptr && ptr->value ? (strcasecmp(ptr->value, "yes") == 0) : dflt;
+}
+
+unsigned long getlogindefs_num(const char *name, unsigned long dflt)
+{
+	struct item *ptr = search(name);
+	char *end = NULL;
+	unsigned long retval;
+
+	if (!ptr || !ptr->value)
+		return dflt;
+
+	errno = 0;
+	retval = strtoul(ptr->value, &end, 0);
+	if (end && *end == '\0' && !errno)
+		return retval;
+
+	syslog(LOG_NOTICE, _("%s: %s contains invalid numerical value: %s"),
+	       search_config(name), name, ptr->value);
+	return dflt;
+}
+
+/*
+ * Returns:
+ *	@dflt		if @name not found
+ *	""		(empty string) if found, but value not defined
+ *	"string"	if found
+ */
+const char *getlogindefs_str(const char *name, const char *dflt)
+{
+	struct item *ptr = search(name);
+
+	if (!ptr)
+		return dflt;
+	if (!ptr->value)
+		return "";
+	return ptr->value;
+}
+
+#else /* !HAVE_LIBECONF */
+
+#include <libeconf.h>
+
+static econf_file *file = NULL;
+
+void free_getlogindefs_data(void)
+{
+	econf_free (file);
+	file = NULL;
+}
+
+static void load_defaults(void)
+{
+	econf_err error;
+
+	if (file != NULL)
+	        free_getlogindefs_data();
+
+	error = econf_readDirs(&file,
+#if USE_VENDORDIR
+			_PATH_VENDORDIR,
+#else
+			NULL,
+#endif
+			"/etc", "login", "defs", "= \t", "#");
+
+	if (error)
+	  syslog(LOG_NOTICE, _("Error reading login.defs: %s"),
+		 econf_errString(error));
+
+	if (logindefs_loader)
+		logindefs_loader(logindefs_loader_data);
+
+}
+
+void logindefs_load_file(const char *filename)
+{
+	econf_file *file_l = NULL, *file_m = NULL;
+	char *path;
+
+	logindefs_loader = NULL; /* No recursion */
+
+#if USE_VENDORDIR
+	xasprintf(&path, _PATH_VENDORDIR"/%s", filename);
+
+	if (!econf_readFile(&file_l, path, "= \t", "#")) {
+	        if (file == NULL)
+		        file = file_l;
+	        else if (!econf_mergeFiles(&file_m, file, file_l)) {
+		        econf_free(file);
+			file = file_m;
+			econf_free(file_l);
+		}
+	}
+	free (path);
+#endif
+
+	xasprintf(&path, "/etc/%s", filename);
+
+	if (!econf_readFile(&file_l, path, "= \t", "#")) {
+	        if (file == NULL)
+		        file = file_l;
+	        else if (!econf_mergeFiles(&file_m, file, file_l)) {
+	                econf_free(file);
+			file = file_m;
+			econf_free(file_l);
+		}
+
+	/* Try original filename, could be relative */
+	} else if (!econf_readFile(&file_l, filename, "= \t", "#")) {
+		if (file == NULL)
+			file = file_l;
+		else if (!econf_mergeFiles(&file_m, file, file_l)) {
+			econf_free(file);
+			file = file_m;
+			econf_free(file_l);
+		}
+	}
+	free (path);
+}
+
+int getlogindefs_bool(const char *name, int dflt)
+{
+        bool value;
+	econf_err error;
+
+	if (!file)
+	        load_defaults();
+
+	if (!file)
+		return dflt;
+
+	if ((error = econf_getBoolValue(file, NULL, name, &value))) {
+	        if (error != ECONF_NOKEY)
+	                syslog(LOG_NOTICE, _("couldn't fetch %s: %s"), name,
+			       econf_errString(error));
+		return dflt;
+	}
+	return value;
+}
+
+unsigned long getlogindefs_num(const char *name, unsigned long dflt)
+{
+	uint64_t value;
+	econf_err error;
+
+	if (!file)
+	        load_defaults();
+
+	if (!file)
+		return dflt;
+
+	if ((error = econf_getUInt64Value(file, NULL, name, &value))) {
+	        if (error != ECONF_NOKEY)
+		        syslog(LOG_NOTICE, _("couldn't fetch %s: %s"), name,
+			       econf_errString(error));
+		return dflt;
+	}
+	return value;
+}
+
+/*
+ * Returns:
+ *	@dflt		if @name not found
+ *	""		(empty string) if found, but value not defined
+ *	"string"	if found
+ */
+const char *getlogindefs_str(const char *name, const char *dflt)
+{
+        char *value;
+	econf_err error;
+
+	if (!file)
+	        load_defaults();
+
+	if (!file)
+		return dflt;
+
+	if ((error = econf_getStringValue(file, NULL, name, &value))) {
+	        if (error != ECONF_NOKEY)
+		  syslog(LOG_NOTICE, _("couldn't fetch %s: %s"), name,
+			 econf_errString(error));
+		return dflt;
+	}
+	if (value)
+		return value;
+
+	return xstrdup("");
+}
+#endif /* !HAVE_LIBECONF */
+
+/*
+ * For compatibility with shadow-utils we have to support additional
+ * syntax for environment variables in login.defs(5) file. The standard
+ * syntax is:
+ *
+ *	ENV_FOO   data
+ *
+ * but shadow-utils supports also
+ *
+ *	ENV_FOO FOO=data
+ *
+ * the FOO= prefix has to be remove before we call setenv().
+ */
+int logindefs_setenv(const char *name, const char *conf, const char *dflt)
+{
+	const char *val = getlogindefs_str(conf, dflt);
+	const char *p;
+
+	if (!val)
+		return -1;
+
+	p = strchr(val, '=');
+	if (p) {
+		size_t sz = strlen(name);
+
+		if (strncmp(val, name, sz) == 0 && *(p + 1)) {
+			val = p + 1;
+			if (*val == '"')
+				val++;
+			if (!*val)
+				val = dflt;
+		}
+	}
+
+	return val ? setenv(name, val, 1) : -1;
+}
+
+/*
+ * We need to check the effective UID/GID. For example, $HOME could be on a
+ * root-squashed NFS or on an NFS with UID mapping, and access(2) uses the
+ * real UID/GID.  Then open(2) seems as the surest solution.
+ * -- kzak@redhat.com (10-Apr-2009)
+ */
+int effective_access(const char *path, int mode)
+{
+	int fd = open(path, mode);
+	if (fd != -1)
+		close(fd);
+	return fd == -1 ? -1 : 0;
+}
+
+/*
+ * Check the per-account or the global hush-login setting.
+ *
+ * Hushed mode is enabled:
+ *
+ * a) if a global (e.g. /etc/hushlogins) hush file exists:
+ *     1) for ALL ACCOUNTS if the file is empty
+ *     2) for the current user if the username or shell is found in the file
+ *
+ * b) if a ~/.hushlogin file exists
+ *
+ * The ~/.hushlogin file is ignored if the global hush file exists.
+ *
+ * The HUSHLOGIN_FILE login.def variable overrides the default hush filename.
+ *
+ * Note that shadow-utils login(1) does not support "a1)". The "a1)" is
+ * necessary if you want to use PAM for "Last login" message.
+ *
+ * -- Karel Zak <kzak@redhat.com> (26-Aug-2011)
+ *
+ *
+ * The per-account check requires some explanation: As root we may not be able
+ * to read the directory of the user if it is on an NFS-mounted filesystem. We
+ * temporarily set our effective uid to the user-uid, making sure that we keep
+ * root privileges in the real uid.
+ *
+ * A portable solution would require a fork(), but we rely on Linux having the
+ * BSD setreuid().
+ */
+
+int get_hushlogin_status(struct passwd *pwd, int force_check)
+{
+	const char *files[] = { _PATH_HUSHLOGINS, _PATH_HUSHLOGIN, NULL };
+	const char *file;
+	char buf[BUFSIZ];
+	int i;
+
+	file = getlogindefs_str("HUSHLOGIN_FILE", NULL);
+	if (file) {
+		if (!*file)
+			return 0;	/* empty HUSHLOGIN_FILE defined */
+
+		files[0] = file;
+		files[1] = NULL;
+	}
+
+	for (i = 0; files[i]; i++) {
+		int ok = 0;
+
+		file = files[i];
+
+		/* global hush-file */
+		if (*file == '/') {
+			struct stat st;
+			FILE *f;
+
+			if (stat(file, &st) != 0)
+				continue;	/* file does not exist */
+
+			if (st.st_size == 0)
+				return 1;	/* for all accounts */
+
+			f = fopen(file, "r");
+			if (!f)
+				continue;	/* ignore errors... */
+
+			while (ok == 0 && fgets(buf, sizeof(buf), f)) {
+				if (buf[0] != '\0')
+					buf[strlen(buf) - 1] = '\0';
+				ok = !strcmp(buf, *buf == '/' ? pwd->pw_shell :
+								pwd->pw_name);
+			}
+			fclose(f);
+			if (ok)
+				return 1;	/* found username/shell */
+
+			return 0;		/* ignore per-account files */
+		}
+
+		/* per-account setting */
+		if (strlen(pwd->pw_dir) + strlen(file) + 2 > sizeof(buf))
+			continue;
+
+		if (snprintf(buf, sizeof(buf), "%s/%s", pwd->pw_dir, file) < 0)
+			continue;
+
+		if (force_check) {
+			uid_t ruid = getuid();
+			gid_t egid = getegid();
+
+			if (setregid(-1, pwd->pw_gid) == 0 &&
+			    setreuid(0, pwd->pw_uid) == 0)
+				ok = effective_access(buf, O_RDONLY) == 0;
+
+			if (setuid(0) != 0 ||
+			    setreuid(ruid, 0) != 0 ||
+			    setregid(-1, egid) != 0) {
+				syslog(LOG_ALERT, _("hush login status: restore original IDs failed"));
+				exit(EXIT_FAILURE);
+			}
+			if (ok)
+				return 1;	/* enabled by user */
+		}
+		else {
+			int rc;
+			rc = effective_access(buf, O_RDONLY);
+			if (rc == 0)
+				return 1;
+
+			if (rc == -1 && errno == EACCES)
+				return -1;
+		}
+
+	}
+
+	return 0;
+}
+#ifdef TEST_PROGRAM
+int main(int argc, char *argv[])
+{
+	char *name, *type;
+	close_stdout_atexit();
+
+	if (argc <= 1)
+		errx(EXIT_FAILURE, "usage: %s <filename> "
+		     "[<str|num|bool> <valname>]", argv[0]);
+
+	logindefs_load_file(argv[1]);
+
+	if (argc != 4) {	/* list all */
+#ifdef HAVE_LIBECONF
+		int i;
+		char *keys[] = {"END", "EMPTY", "CRAZY3", "CRAZY2", "CRAZY1",
+				"BOOLEAN", "NUMBER", "STRING", "HELLO_WORLD",
+				NULL};
+
+		for (i = 0; keys[i] != NULL; i++) {
+		  	char *value = NULL;
+
+			econf_getStringValue(file, NULL, keys[i], &value);
+		        printf ("%s: $%s: '%s'\n", argv[1], keys[i], value);
+		}
+
+		econf_free (file);
+
+#else
+		struct item *ptr;
+
+		for (ptr = list; ptr; ptr = ptr->next)
+			printf("%s: $%s: '%s'\n", ptr->path, ptr->name,
+			       ptr->value);
+#endif
+		return EXIT_SUCCESS;
+	}
+
+	type = argv[2];
+	name = argv[3];
+
+	if (strcmp(type, "str") == 0)
+		printf("$%s: '%s'\n", name, getlogindefs_str(name, "DEFAULT"));
+	else if (strcmp(type, "num") == 0)
+		printf("$%s: '%ld'\n", name, getlogindefs_num(name, 0));
+	else if (strcmp(type, "bool") == 0)
+		printf("$%s: '%s'\n", name,
+		       getlogindefs_bool(name, 0) ? "Y" : "N");
+
+	return EXIT_SUCCESS;
+}
+#endif
diff --git a/lib/loopdev.c b/lib/loopdev.c
new file mode 100644
index 0000000..dd9ead3
--- /dev/null
+++ b/lib/loopdev.c
@@ -0,0 +1,1935 @@
+
+/*
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Written by Karel Zak <kzak@redhat.com>
+ *
+ * -- based on mount/losetup.c
+ *
+ * Simple library for work with loop devices.
+ *
+ *  - requires kernel 2.6.x
+ *  - reads info from /sys/block/loop<N>/loop/<attr> (new kernels)
+ *  - reads info by ioctl
+ *  - supports *unlimited* number of loop devices
+ *  - supports /dev/loop<N> as well as /dev/loop/<N>
+ *  - minimize overhead (fd, loopinfo, ... are shared for all operations)
+ *  - setup (associate device and backing file)
+ *  - delete (dis-associate file)
+ *  - old LOOP_{SET,GET}_STATUS (32bit) ioctls are unsupported
+ *  - extendible
+ */
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <ctype.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <inttypes.h>
+#include <dirent.h>
+
+#include "linux_version.h"
+#include "c.h"
+#include "sysfs.h"
+#include "pathnames.h"
+#include "loopdev.h"
+#include "canonicalize.h"
+#include "blkdev.h"
+#include "debug.h"
+#include "fileutils.h"
+
+#define LOOPDEV_MAX_TRIES	10
+
+/*
+ * Debug stuff (based on include/debug.h)
+ */
+static UL_DEBUG_DEFINE_MASK(loopdev);
+UL_DEBUG_DEFINE_MASKNAMES(loopdev) = UL_DEBUG_EMPTY_MASKNAMES;
+
+#define LOOPDEV_DEBUG_INIT	(1 << 1)
+#define LOOPDEV_DEBUG_CXT	(1 << 2)
+#define LOOPDEV_DEBUG_ITER	(1 << 3)
+#define LOOPDEV_DEBUG_SETUP	(1 << 4)
+
+#define DBG(m, x)       __UL_DBG(loopdev, LOOPDEV_DEBUG_, m, x)
+#define ON_DBG(m, x)    __UL_DBG_CALL(loopdev, LOOPDEV_DEBUG_, m, x)
+
+#define UL_DEBUG_CURRENT_MASK	UL_DEBUG_MASK(loopdev)
+#include "debugobj.h"
+
+static void loopdev_init_debug(void)
+{
+	if (loopdev_debug_mask)
+		return;
+	__UL_INIT_DEBUG_FROM_ENV(loopdev, LOOPDEV_DEBUG_, 0, LOOPDEV_DEBUG);
+}
+
+/*
+ * see loopcxt_init()
+ */
+#define loopcxt_ioctl_enabled(_lc)	(!((_lc)->flags & LOOPDEV_FL_NOIOCTL))
+#define loopcxt_sysfs_available(_lc)	(!((_lc)->flags & LOOPDEV_FL_NOSYSFS)) \
+					 && !loopcxt_ioctl_enabled(_lc)
+
+/*
+ * Calls @x and repeat on EAGAIN
+ */
+#define repeat_on_eagain(x) __extension__ ({			\
+		int _c = 0, _e;					\
+		do {						\
+			errno = 0;				\
+			_e = x;					\
+			if (_e == 0 || errno != EAGAIN)		\
+				break;				\
+			if (_c >= LOOPDEV_MAX_TRIES)		\
+				break;				\
+			xusleep(250000);			\
+			_c++;					\
+		} while (1);					\
+		_e == 0 ? 0 : errno ? -errno : -1;		\
+	})
+
+/*
+ * @lc: context
+ * @device: device name, absolute device path or NULL to reset the current setting
+ *
+ * Sets device, absolute paths (e.g. "/dev/loop<N>") are unchanged, device
+ * names ("loop<N>") are converted to the path (/dev/loop<N> or to
+ * /dev/loop/<N>)
+ *
+ * This sets the device name, but does not check if the device exists!
+ *
+ * Returns: <0 on error, 0 on success
+ */
+int loopcxt_set_device(struct loopdev_cxt *lc, const char *device)
+{
+	if (!lc)
+		return -EINVAL;
+
+	if (lc->fd >= 0) {
+		close(lc->fd);
+		DBG(CXT, ul_debugobj(lc, "closing old open fd"));
+	}
+	lc->fd = -1;
+	lc->mode = 0;
+	lc->blocksize = 0;
+	lc->has_info = 0;
+	lc->info_failed = 0;
+	*lc->device = '\0';
+	memset(&lc->config, 0, sizeof(lc->config));
+
+	/* set new */
+	if (device) {
+		if (*device != '/') {
+			const char *dir = _PATH_DEV;
+
+			/* compose device name for /dev/loop<n> or /dev/loop/<n> */
+			if (lc->flags & LOOPDEV_FL_DEVSUBDIR) {
+				if (strlen(device) < 5)
+					return -1;
+				device += 4;
+				dir = _PATH_DEV_LOOP "/";	/* _PATH_DEV uses tailing slash */
+			}
+			snprintf(lc->device, sizeof(lc->device), "%s%s",
+				dir, device);
+		} else
+			xstrncpy(lc->device, device, sizeof(lc->device));
+
+		DBG(CXT, ul_debugobj(lc, "%s name assigned", device));
+	}
+
+	ul_unref_path(lc->sysfs);
+	lc->sysfs = NULL;
+	return 0;
+}
+
+int loopcxt_has_device(struct loopdev_cxt *lc)
+{
+	return lc && *lc->device;
+}
+
+/*
+ * @lc: context
+ * @flags: LOOPDEV_FL_* flags
+ *
+ * Initialize loop handler.
+ *
+ * We have two sets of the flags:
+ *
+ *	* LOOPDEV_FL_* flags control loopcxt_* API behavior
+ *
+ *	* LO_FLAGS_* are kernel flags used for LOOP_{SET,GET}_STAT64 ioctls
+ *
+ * Note about LOOPDEV_FL_{RDONLY,RDWR} flags. These flags are used for open(2)
+ * syscall to open loop device. By default is the device open read-only.
+ *
+ * The exception is loopcxt_setup_device(), where the device is open read-write
+ * if LO_FLAGS_READ_ONLY flags is not set (see loopcxt_set_flags()).
+ *
+ * Returns: <0 on error, 0 on success.
+ */
+int loopcxt_init(struct loopdev_cxt *lc, int flags)
+{
+	int rc;
+	struct stat st;
+	struct loopdev_cxt dummy = UL_LOOPDEVCXT_EMPTY;
+
+	if (!lc)
+		return -EINVAL;
+
+	loopdev_init_debug();
+	DBG(CXT, ul_debugobj(lc, "initialize context"));
+
+	memcpy(lc, &dummy, sizeof(dummy));
+	lc->flags = flags;
+
+	rc = loopcxt_set_device(lc, NULL);
+	if (rc)
+		return rc;
+
+	if (stat(_PATH_SYS_BLOCK, &st) || !S_ISDIR(st.st_mode)) {
+		lc->flags |= LOOPDEV_FL_NOSYSFS;
+		lc->flags &= ~LOOPDEV_FL_NOIOCTL;
+		DBG(CXT, ul_debugobj(lc, "init: disable /sys usage"));
+	}
+
+	if (!(lc->flags & LOOPDEV_FL_NOSYSFS) &&
+	    get_linux_version() >= KERNEL_VERSION(2,6,37)) {
+		/*
+		 * Use only sysfs for basic information about loop devices
+		 */
+		lc->flags |= LOOPDEV_FL_NOIOCTL;
+		DBG(CXT, ul_debugobj(lc, "init: ignore ioctls"));
+	}
+
+	if (!(lc->flags & LOOPDEV_FL_CONTROL) && !stat(_PATH_DEV_LOOPCTL, &st)) {
+		lc->flags |= LOOPDEV_FL_CONTROL;
+		DBG(CXT, ul_debugobj(lc, "init: loop-control detected "));
+	}
+
+	return 0;
+}
+
+/*
+ * @lc: context
+ *
+ * Deinitialize loop context
+ */
+void loopcxt_deinit(struct loopdev_cxt *lc)
+{
+	int errsv = errno;
+
+	if (!lc)
+		return;
+
+	DBG(CXT, ul_debugobj(lc, "de-initialize"));
+
+	free(lc->filename);
+	lc->filename = NULL;
+
+	ignore_result( loopcxt_set_device(lc, NULL) );
+	loopcxt_deinit_iterator(lc);
+
+	errno = errsv;
+}
+
+/*
+ * @lc: context
+ *
+ * Returns newly allocated device path.
+ */
+char *loopcxt_strdup_device(struct loopdev_cxt *lc)
+{
+	if (!lc || !*lc->device)
+		return NULL;
+	return strdup(lc->device);
+}
+
+/*
+ * @lc: context
+ *
+ * Returns pointer device name in the @lc struct.
+ */
+const char *loopcxt_get_device(struct loopdev_cxt *lc)
+{
+	return lc && *lc->device ? lc->device : NULL;
+}
+
+/*
+ * @lc: context
+ *
+ * Returns pointer to the sysfs context (see lib/sysfs.c)
+ */
+static struct path_cxt *loopcxt_get_sysfs(struct loopdev_cxt *lc)
+{
+	if (!lc || !*lc->device || (lc->flags & LOOPDEV_FL_NOSYSFS))
+		return NULL;
+
+	if (!lc->sysfs) {
+		dev_t devno = sysfs_devname_to_devno(lc->device);
+		if (!devno) {
+			DBG(CXT, ul_debugobj(lc, "sysfs: failed devname to devno"));
+			return NULL;
+		}
+
+		lc->sysfs = ul_new_sysfs_path(devno, NULL, NULL);
+		if (!lc->sysfs)
+			DBG(CXT, ul_debugobj(lc, "sysfs: init failed"));
+	}
+
+	return lc->sysfs;
+}
+
+/*
+ * @lc: context
+ *
+ * Returns: file descriptor to the open loop device or <0 on error. The mode
+ *          depends on LOOPDEV_FL_{RDWR,RDONLY} context flags. Default is
+ *          read-only.
+ */
+int loopcxt_get_fd(struct loopdev_cxt *lc)
+{
+	if (!lc || !*lc->device)
+		return -EINVAL;
+
+	if (lc->fd < 0) {
+		lc->mode = lc->flags & LOOPDEV_FL_RDWR ? O_RDWR : O_RDONLY;
+		lc->fd = open(lc->device, lc->mode | O_CLOEXEC);
+		DBG(CXT, ul_debugobj(lc, "open %s [%s]: %m", lc->device,
+				lc->flags & LOOPDEV_FL_RDWR ? "rw" : "ro"));
+	}
+	return lc->fd;
+}
+
+int loopcxt_set_fd(struct loopdev_cxt *lc, int fd, int mode)
+{
+	if (!lc)
+		return -EINVAL;
+
+	lc->fd = fd;
+	lc->mode = mode;
+	return 0;
+}
+
+/*
+ * @lc: context
+ * @flags: LOOPITER_FL_* flags
+ *
+ * Iterator can be used to scan list of the free or used loop devices.
+ *
+ * Returns: <0 on error, 0 on success
+ */
+int loopcxt_init_iterator(struct loopdev_cxt *lc, int flags)
+{
+	struct loopdev_iter *iter;
+	struct stat st;
+
+	if (!lc)
+		return -EINVAL;
+
+
+	iter = &lc->iter;
+	DBG(ITER, ul_debugobj(iter, "initialize"));
+
+	/* always zeroize
+	 */
+	memset(iter, 0, sizeof(*iter));
+	iter->ncur = -1;
+	iter->flags = flags;
+	iter->default_check = 1;
+
+	if (!lc->extra_check) {
+		/*
+		 * Check for /dev/loop/<N> subdirectory
+		 */
+		if (!(lc->flags & LOOPDEV_FL_DEVSUBDIR) &&
+		    stat(_PATH_DEV_LOOP, &st) == 0 && S_ISDIR(st.st_mode))
+			lc->flags |= LOOPDEV_FL_DEVSUBDIR;
+
+		lc->extra_check = 1;
+	}
+	return 0;
+}
+
+/*
+ * @lc: context
+ *
+ * Returns: <0 on error, 0 on success
+ */
+int loopcxt_deinit_iterator(struct loopdev_cxt *lc)
+{
+	struct loopdev_iter *iter;
+
+	if (!lc)
+		return -EINVAL;
+
+	iter = &lc->iter;
+	DBG(ITER, ul_debugobj(iter, "de-initialize"));
+
+	free(iter->minors);
+	if (iter->proc)
+		fclose(iter->proc);
+	if (iter->sysblock)
+		closedir(iter->sysblock);
+
+	memset(iter, 0, sizeof(*iter));
+	return 0;
+}
+
+/*
+ * Same as loopcxt_set_device, but also checks if the device is
+ * associated with any file.
+ *
+ * Returns: <0 on error, 0 on success, 1 device does not match with
+ *         LOOPITER_FL_{USED,FREE} flags.
+ */
+static int loopiter_set_device(struct loopdev_cxt *lc, const char *device)
+{
+	int rc = loopcxt_set_device(lc, device);
+	int used;
+
+	if (rc)
+		return rc;
+
+	if (!(lc->iter.flags & LOOPITER_FL_USED) &&
+	    !(lc->iter.flags & LOOPITER_FL_FREE))
+		return 0;	/* caller does not care about device status */
+
+	if (!is_loopdev(lc->device)) {
+		DBG(ITER, ul_debugobj(&lc->iter, "%s does not exist", lc->device));
+		return -errno;
+	}
+
+	DBG(ITER, ul_debugobj(&lc->iter, "%s exist", lc->device));
+
+	used = loopcxt_get_offset(lc, NULL) == 0;
+
+	if ((lc->iter.flags & LOOPITER_FL_USED) && used)
+		return 0;
+
+	if ((lc->iter.flags & LOOPITER_FL_FREE) && !used)
+		return 0;
+
+	DBG(ITER, ul_debugobj(&lc->iter, "failed to use %s device", lc->device));
+
+	ignore_result( loopcxt_set_device(lc, NULL) );
+	return 1;
+}
+
+static int cmpnum(const void *p1, const void *p2)
+{
+	return (((* (const int *) p1) > (* (const int *) p2)) -
+			((* (const int *) p1) < (* (const int *) p2)));
+}
+
+/*
+ * The classic scandir() is more expensive and less portable.
+ * We needn't full loop device names -- loop numbers (loop<N>)
+ * are enough.
+ */
+static int loop_scandir(const char *dirname, int **ary, int hasprefix)
+{
+	DIR *dir;
+	struct dirent *d;
+	unsigned int n, count = 0, arylen = 0;
+
+	if (!dirname || !ary)
+		return 0;
+
+	DBG(ITER, ul_debug("scan dir: %s", dirname));
+
+	dir = opendir(dirname);
+	if (!dir)
+		return 0;
+	free(*ary);
+	*ary = NULL;
+
+	while((d = readdir(dir))) {
+#ifdef _DIRENT_HAVE_D_TYPE
+		if (d->d_type != DT_BLK && d->d_type != DT_UNKNOWN &&
+		    d->d_type != DT_LNK)
+			continue;
+#endif
+		if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
+			continue;
+
+		if (hasprefix) {
+			/* /dev/loop<N> */
+			if (sscanf(d->d_name, "loop%u", &n) != 1)
+				continue;
+		} else {
+			/* /dev/loop/<N> */
+			char *end = NULL;
+
+			errno = 0;
+			n = strtol(d->d_name, &end, 10);
+			if (d->d_name == end || (end && *end) || errno)
+				continue;
+		}
+		if (n < LOOPDEV_DEFAULT_NNODES)
+			continue;			/* ignore loop<0..7> */
+
+		if (count + 1 > arylen) {
+			int *tmp;
+
+			arylen += 1;
+
+			tmp = realloc(*ary, arylen * sizeof(int));
+			if (!tmp) {
+				free(*ary);
+				*ary = NULL;
+				closedir(dir);
+				return -1;
+			}
+			*ary = tmp;
+		}
+		if (*ary)
+			(*ary)[count++] = n;
+	}
+	if (count && *ary)
+		qsort(*ary, count, sizeof(int), cmpnum);
+
+	closedir(dir);
+	return count;
+}
+
+/*
+ * Set the next *used* loop device according to /proc/partitions.
+ *
+ * Loop devices smaller than 512 bytes are invisible for this function.
+ */
+static int loopcxt_next_from_proc(struct loopdev_cxt *lc)
+{
+	struct loopdev_iter *iter = &lc->iter;
+	char buf[BUFSIZ];
+
+	DBG(ITER, ul_debugobj(iter, "scan /proc/partitions"));
+
+	if (!iter->proc)
+		iter->proc = fopen(_PATH_PROC_PARTITIONS, "r" UL_CLOEXECSTR);
+	if (!iter->proc)
+		return 1;
+
+	while (fgets(buf, sizeof(buf), iter->proc)) {
+		unsigned int m;
+		char name[128 + 1];
+
+
+		if (sscanf(buf, " %u %*s %*s %128[^\n ]",
+			   &m, name) != 2 || m != LOOPDEV_MAJOR)
+			continue;
+
+		DBG(ITER, ul_debugobj(iter, "checking %s", name));
+
+		if (loopiter_set_device(lc, name) == 0)
+			return 0;
+	}
+
+	return 1;
+}
+
+/*
+ * Set the next *used* loop device according to
+ * /sys/block/loopN/loop/backing_file (kernel >= 2.6.37 is required).
+ *
+ * This is preferred method.
+ */
+static int loopcxt_next_from_sysfs(struct loopdev_cxt *lc)
+{
+	struct loopdev_iter *iter = &lc->iter;
+	struct dirent *d;
+	int fd;
+
+	DBG(ITER, ul_debugobj(iter, "scanning /sys/block"));
+
+	if (!iter->sysblock)
+		iter->sysblock = opendir(_PATH_SYS_BLOCK);
+
+	if (!iter->sysblock)
+		return 1;
+
+	fd = dirfd(iter->sysblock);
+
+	while ((d = readdir(iter->sysblock))) {
+		char name[NAME_MAX + 18 + 1];
+		struct stat st;
+
+		DBG(ITER, ul_debugobj(iter, "check %s", d->d_name));
+
+		if (strcmp(d->d_name, ".") == 0
+		    || strcmp(d->d_name, "..") == 0
+		    || strncmp(d->d_name, "loop", 4) != 0)
+			continue;
+
+		snprintf(name, sizeof(name), "%s/loop/backing_file", d->d_name);
+		if (fstatat(fd, name, &st, 0) != 0)
+			continue;
+
+		if (loopiter_set_device(lc, d->d_name) == 0)
+			return 0;
+	}
+
+	return 1;
+}
+
+/*
+ * @lc: context, has to initialized by loopcxt_init_iterator()
+ *
+ * Returns: 0 on success, < 0 on error, 1 at the end of scanning. The details
+ *          about the current loop device are available by
+ *          loopcxt_get_{fd,backing_file,device,offset, ...} functions.
+ */
+int loopcxt_next(struct loopdev_cxt *lc)
+{
+	struct loopdev_iter *iter;
+
+	if (!lc)
+		return -EINVAL;
+
+
+	iter = &lc->iter;
+	if (iter->done)
+		return 1;
+
+	DBG(ITER, ul_debugobj(iter, "next"));
+
+	/* A) Look for used loop devices in /proc/partitions ("losetup -a" only)
+	 */
+	if (iter->flags & LOOPITER_FL_USED) {
+		int rc;
+
+		if (loopcxt_sysfs_available(lc))
+			rc = loopcxt_next_from_sysfs(lc);
+		else
+			rc = loopcxt_next_from_proc(lc);
+		if (rc == 0)
+			return 0;
+		goto done;
+	}
+
+	/* B) Classic way, try first eight loop devices (default number
+	 *    of loop devices). This is enough for 99% of all cases.
+	 */
+	if (iter->default_check) {
+		DBG(ITER, ul_debugobj(iter, "next: default check"));
+		for (++iter->ncur; iter->ncur < LOOPDEV_DEFAULT_NNODES;
+							iter->ncur++) {
+			char name[16];
+			snprintf(name, sizeof(name), "loop%d", iter->ncur);
+
+			if (loopiter_set_device(lc, name) == 0)
+				return 0;
+		}
+		iter->default_check = 0;
+	}
+
+	/* C) the worst possibility, scan whole /dev or /dev/loop/<N>
+	 */
+	if (!iter->minors) {
+		DBG(ITER, ul_debugobj(iter, "next: scanning /dev"));
+		iter->nminors = (lc->flags & LOOPDEV_FL_DEVSUBDIR) ?
+			loop_scandir(_PATH_DEV_LOOP, &iter->minors, 0) :
+			loop_scandir(_PATH_DEV, &iter->minors, 1);
+		iter->ncur = -1;
+	}
+	for (++iter->ncur; iter->ncur < iter->nminors; iter->ncur++) {
+		char name[16];
+		snprintf(name, sizeof(name), "loop%d", iter->minors[iter->ncur]);
+
+		if (loopiter_set_device(lc, name) == 0)
+			return 0;
+	}
+done:
+	loopcxt_deinit_iterator(lc);
+	return 1;
+}
+
+/*
+ * @device: path to device
+ */
+int is_loopdev(const char *device)
+{
+	struct stat st;
+	int rc = 0;
+
+	if (!device || stat(device, &st) != 0 || !S_ISBLK(st.st_mode))
+		rc = 0;
+	else if (major(st.st_rdev) == LOOPDEV_MAJOR)
+		rc = 1;
+	else if (sysfs_devno_is_wholedisk(st.st_rdev)) {
+		/* It's possible that kernel creates a device with a different
+		 * major number ... check by /sys it's really loop device.
+		 */
+		char name[PATH_MAX], *cn, *p = NULL;
+
+		snprintf(name, sizeof(name), _PATH_SYS_DEVBLOCK "/%d:%d",
+				major(st.st_rdev), minor(st.st_rdev));
+		cn = canonicalize_path(name);
+		if (cn)
+			p = stripoff_last_component(cn);
+		rc = p && startswith(p, "loop");
+		free(cn);
+	}
+
+	if (rc == 0)
+		errno = ENODEV;
+	return rc;
+}
+
+/*
+ * @lc: context
+ *
+ * Returns result from LOOP_GET_STAT64 ioctl or NULL on error.
+ */
+struct loop_info64 *loopcxt_get_info(struct loopdev_cxt *lc)
+{
+	int fd;
+
+	if (!lc || lc->info_failed) {
+		errno = EINVAL;
+		return NULL;
+	}
+	errno = 0;
+	if (lc->has_info)
+		return &lc->config.info;
+
+	fd = loopcxt_get_fd(lc);
+	if (fd < 0)
+		return NULL;
+
+	if (ioctl(fd, LOOP_GET_STATUS64, &lc->config.info) == 0) {
+		lc->has_info = 1;
+		lc->info_failed = 0;
+		DBG(CXT, ul_debugobj(lc, "reading loop_info64 OK"));
+		return &lc->config.info;
+	}
+
+	lc->info_failed = 1;
+	DBG(CXT, ul_debugobj(lc, "reading loop_info64 FAILED"));
+
+	return NULL;
+}
+
+/*
+ * @lc: context
+ *
+ * Returns (allocated) string with path to the file associated
+ * with the current loop device.
+ */
+char *loopcxt_get_backing_file(struct loopdev_cxt *lc)
+{
+	struct path_cxt *sysfs = loopcxt_get_sysfs(lc);
+	char *res = NULL;
+
+	if (sysfs)
+		/*
+		 * This is always preferred, the loop_info64
+		 * has too small buffer for the filename.
+		 */
+		ul_path_read_string(sysfs, &res, "loop/backing_file");
+
+	if (!res && loopcxt_ioctl_enabled(lc)) {
+		struct loop_info64 *lo = loopcxt_get_info(lc);
+
+		if (lo) {
+			lo->lo_file_name[LO_NAME_SIZE - 2] = '*';
+			lo->lo_file_name[LO_NAME_SIZE - 1] = '\0';
+			res = strdup((char *) lo->lo_file_name);
+		}
+	}
+
+	DBG(CXT, ul_debugobj(lc, "get_backing_file [%s]", res));
+	return res;
+}
+
+/*
+ * @lc: context
+ * @offset: returns offset number for the given device
+ *
+ * Returns: <0 on error, 0 on success
+ */
+int loopcxt_get_offset(struct loopdev_cxt *lc, uint64_t *offset)
+{
+	struct path_cxt *sysfs = loopcxt_get_sysfs(lc);
+	int rc = -EINVAL;
+
+	if (sysfs)
+		if (ul_path_read_u64(sysfs, offset, "loop/offset") == 0)
+			rc = 0;
+
+	if (rc && loopcxt_ioctl_enabled(lc)) {
+		struct loop_info64 *lo = loopcxt_get_info(lc);
+		if (lo) {
+			if (offset)
+				*offset = lo->lo_offset;
+			rc = 0;
+		} else
+			rc = -errno;
+	}
+
+	DBG(CXT, ul_debugobj(lc, "get_offset [rc=%d]", rc));
+	return rc;
+}
+
+/*
+ * @lc: context
+ * @blocksize: returns logical blocksize for the given device
+ *
+ * Returns: <0 on error, 0 on success
+ */
+int loopcxt_get_blocksize(struct loopdev_cxt *lc, uint64_t *blocksize)
+{
+	struct path_cxt *sysfs = loopcxt_get_sysfs(lc);
+	int rc = -EINVAL;
+
+	if (sysfs)
+		if (ul_path_read_u64(sysfs, blocksize, "queue/logical_block_size") == 0)
+			rc = 0;
+
+	/* Fallback based on BLKSSZGET ioctl */
+	if (rc) {
+		int fd = loopcxt_get_fd(lc);
+		int sz = 0;
+
+		if (fd < 0)
+			return -EINVAL;
+		rc = blkdev_get_sector_size(fd, &sz);
+		if (rc)
+			return rc;
+
+		*blocksize = sz;
+	}
+
+	DBG(CXT, ul_debugobj(lc, "get_blocksize [rc=%d]", rc));
+	return rc;
+}
+
+/*
+ * @lc: context
+ * @sizelimit: returns size limit for the given device
+ *
+ * Returns: <0 on error, 0 on success
+ */
+int loopcxt_get_sizelimit(struct loopdev_cxt *lc, uint64_t *size)
+{
+	struct path_cxt *sysfs = loopcxt_get_sysfs(lc);
+	int rc = -EINVAL;
+
+	if (sysfs)
+		if (ul_path_read_u64(sysfs, size, "loop/sizelimit") == 0)
+			rc = 0;
+
+	if (rc && loopcxt_ioctl_enabled(lc)) {
+		struct loop_info64 *lo = loopcxt_get_info(lc);
+		if (lo) {
+			if (size)
+				*size = lo->lo_sizelimit;
+			rc = 0;
+		} else
+			rc = -errno;
+	}
+
+	DBG(CXT, ul_debugobj(lc, "get_sizelimit [rc=%d]", rc));
+	return rc;
+}
+
+/*
+ * @lc: context
+ * @devno: returns encryption type
+ *
+ * Cryptoloop is DEPRECATED!
+ *
+ * Returns: <0 on error, 0 on success
+ */
+int loopcxt_get_encrypt_type(struct loopdev_cxt *lc, uint32_t *type)
+{
+	struct loop_info64 *lo = loopcxt_get_info(lc);
+	int rc;
+
+	/* not provided by sysfs */
+	if (lo) {
+		if (type)
+			*type = lo->lo_encrypt_type;
+		rc = 0;
+	} else
+		rc = -errno;
+
+	DBG(CXT, ul_debugobj(lc, "get_encrypt_type [rc=%d]", rc));
+	return rc;
+}
+
+/*
+ * @lc: context
+ * @devno: returns crypt name
+ *
+ * Cryptoloop is DEPRECATED!
+ *
+ * Returns: <0 on error, 0 on success
+ */
+const char *loopcxt_get_crypt_name(struct loopdev_cxt *lc)
+{
+	struct loop_info64 *lo = loopcxt_get_info(lc);
+
+	if (lo)
+		return (char *) lo->lo_crypt_name;
+
+	DBG(CXT, ul_debugobj(lc, "get_crypt_name failed"));
+	return NULL;
+}
+
+/*
+ * @lc: context
+ * @devno: returns backing file devno
+ *
+ * Returns: <0 on error, 0 on success
+ */
+int loopcxt_get_backing_devno(struct loopdev_cxt *lc, dev_t *devno)
+{
+	struct loop_info64 *lo = loopcxt_get_info(lc);
+	int rc;
+
+	if (lo) {
+		if (devno)
+			*devno = lo->lo_device;
+		rc = 0;
+	} else
+		rc = -errno;
+
+	DBG(CXT, ul_debugobj(lc, "get_backing_devno [rc=%d]", rc));
+	return rc;
+}
+
+/*
+ * @lc: context
+ * @ino: returns backing file inode
+ *
+ * Returns: <0 on error, 0 on success
+ */
+int loopcxt_get_backing_inode(struct loopdev_cxt *lc, ino_t *ino)
+{
+	struct loop_info64 *lo = loopcxt_get_info(lc);
+	int rc;
+
+	if (lo) {
+		if (ino)
+			*ino = lo->lo_inode;
+		rc = 0;
+	} else
+		rc = -errno;
+
+	DBG(CXT, ul_debugobj(lc, "get_backing_inode [rc=%d]", rc));
+	return rc;
+}
+
+/*
+ * Check if the kernel supports partitioned loop devices.
+ *
+ * Notes:
+ *   - kernels < 3.2 support partitioned loop devices and PT scanning
+ *     only if max_part= module parameter is non-zero
+ *
+ *   - kernels >= 3.2 always support partitioned loop devices
+ *
+ *   - kernels >= 3.2 always support BLKPG_{ADD,DEL}_PARTITION ioctls
+ *
+ *   - kernels >= 3.2 enable PT scanner only if max_part= is non-zero or if the
+ *     LO_FLAGS_PARTSCAN flag is set for the device. The PT scanner is disabled
+ *     by default.
+ *
+ *  See kernel commit e03c8dd14915fabc101aa495828d58598dc5af98.
+ */
+int loopmod_supports_partscan(void)
+{
+	int rc, ret = 0;
+	FILE *f;
+
+	if (get_linux_version() >= KERNEL_VERSION(3,2,0))
+		return 1;
+
+	f = fopen("/sys/module/loop/parameters/max_part", "r" UL_CLOEXECSTR);
+	if (!f)
+		return 0;
+	rc = fscanf(f, "%d", &ret);
+	fclose(f);
+	return rc == 1 ? ret : 0;
+}
+
+/*
+ * @lc: context
+ *
+ * Returns: 1 if the partscan flags is set *or* (for old kernels) partitions
+ * scanning is enabled for all loop devices.
+ */
+int loopcxt_is_partscan(struct loopdev_cxt *lc)
+{
+	struct path_cxt *sysfs = loopcxt_get_sysfs(lc);
+
+	if (sysfs) {
+		/* kernel >= 3.2 */
+		int fl;
+		if (ul_path_read_s32(sysfs, &fl, "loop/partscan") == 0)
+			return fl;
+	}
+
+	/* old kernels (including kernels without loopN/loop/<flags> directory */
+	return loopmod_supports_partscan();
+}
+
+/*
+ * @lc: context
+ *
+ * Returns: 1 if the autoclear flags is set.
+ */
+int loopcxt_is_autoclear(struct loopdev_cxt *lc)
+{
+	struct path_cxt *sysfs = loopcxt_get_sysfs(lc);
+
+	if (sysfs) {
+		int fl;
+		if (ul_path_read_s32(sysfs, &fl, "loop/autoclear") == 0)
+			return fl;
+	}
+
+	if (loopcxt_ioctl_enabled(lc)) {
+		struct loop_info64 *lo = loopcxt_get_info(lc);
+		if (lo)
+			return lo->lo_flags & LO_FLAGS_AUTOCLEAR;
+	}
+	return 0;
+}
+
+/*
+ * @lc: context
+ *
+ * Returns: 1 if the readonly flags is set.
+ */
+int loopcxt_is_readonly(struct loopdev_cxt *lc)
+{
+	struct path_cxt *sysfs = loopcxt_get_sysfs(lc);
+
+	if (sysfs) {
+		int fl;
+		if (ul_path_read_s32(sysfs, &fl, "ro") == 0)
+			return fl;
+	}
+
+	if (loopcxt_ioctl_enabled(lc)) {
+		struct loop_info64 *lo = loopcxt_get_info(lc);
+		if (lo)
+			return lo->lo_flags & LO_FLAGS_READ_ONLY;
+	}
+	return 0;
+}
+
+/*
+ * @lc: context
+ *
+ * Returns: 1 if the dio flags is set.
+ */
+int loopcxt_is_dio(struct loopdev_cxt *lc)
+{
+	struct path_cxt *sysfs = loopcxt_get_sysfs(lc);
+
+	if (sysfs) {
+		int fl;
+		if (ul_path_read_s32(sysfs, &fl, "loop/dio") == 0)
+			return fl;
+	}
+	if (loopcxt_ioctl_enabled(lc)) {
+		struct loop_info64 *lo = loopcxt_get_info(lc);
+		if (lo)
+			return lo->lo_flags & LO_FLAGS_DIRECT_IO;
+	}
+	return 0;
+}
+
+/*
+ * @lc: context
+ * @st: backing file stat or NULL
+ * @backing_file: filename
+ * @offset: offset (use LOOPDEV_FL_OFFSET if specified)
+ * @sizelimit: size limit (use LOOPDEV_FL_SIZELIMIT if specified)
+ * @flags: LOOPDEV_FL_{OFFSET,SIZELIMIT}
+ *
+ * Returns 1 if the current @lc loopdev is associated with the given backing
+ * file. Note that the preferred way is to use devno and inode number rather
+ * than filename. The @backing_file filename is poor solution usable in case
+ * that you don't have rights to call stat().
+ *
+ * LOOPDEV_FL_SIZELIMIT requires LOOPDEV_FL_OFFSET being set as well.
+ *
+ * Don't forget that old kernels provide very restricted (in size) backing
+ * filename by LOOP_GET_STAT64 ioctl only.
+ */
+int loopcxt_is_used(struct loopdev_cxt *lc,
+		    struct stat *st,
+		    const char *backing_file,
+		    uint64_t offset,
+		    uint64_t sizelimit,
+		    int flags)
+{
+	ino_t ino = 0;
+	dev_t dev = 0;
+
+	if (!lc)
+		return 0;
+
+	DBG(CXT, ul_debugobj(lc, "checking %s vs. %s",
+				loopcxt_get_device(lc),
+				backing_file));
+
+	if (st && loopcxt_get_backing_inode(lc, &ino) == 0 &&
+		  loopcxt_get_backing_devno(lc, &dev) == 0) {
+
+		if (ino == st->st_ino && dev == st->st_dev)
+			goto found;
+
+		/* don't use filename if we have devno and inode */
+		return 0;
+	}
+
+	/* poor man's solution */
+	if (backing_file) {
+		char *name = loopcxt_get_backing_file(lc);
+		int rc = name && strcmp(name, backing_file) == 0;
+
+		free(name);
+		if (rc)
+			goto found;
+	}
+
+	return 0;
+found:
+	if (flags & LOOPDEV_FL_OFFSET) {
+		uint64_t off = 0;
+
+		int rc = loopcxt_get_offset(lc, &off) == 0 && off == offset;
+
+		if (rc && flags & LOOPDEV_FL_SIZELIMIT) {
+			uint64_t sz = 0;
+
+			return loopcxt_get_sizelimit(lc, &sz) == 0 && sz == sizelimit;
+		}
+		return rc;
+	}
+	return 1;
+}
+
+/*
+ * The setting is removed by loopcxt_set_device() loopcxt_next()!
+ */
+int loopcxt_set_offset(struct loopdev_cxt *lc, uint64_t offset)
+{
+	if (!lc)
+		return -EINVAL;
+	lc->config.info.lo_offset = offset;
+
+	DBG(CXT, ul_debugobj(lc, "set offset=%jd", offset));
+	return 0;
+}
+
+/*
+ * The setting is removed by loopcxt_set_device() loopcxt_next()!
+ */
+int loopcxt_set_sizelimit(struct loopdev_cxt *lc, uint64_t sizelimit)
+{
+	if (!lc)
+		return -EINVAL;
+	lc->config.info.lo_sizelimit = sizelimit;
+
+	DBG(CXT, ul_debugobj(lc, "set sizelimit=%jd", sizelimit));
+	return 0;
+}
+
+/*
+ * The blocksize will be used by loopcxt_set_device(). For already exiting
+ * devices use  loopcxt_ioctl_blocksize().
+ *
+ * The setting is removed by loopcxt_set_device() loopcxt_next()!
+ */
+int loopcxt_set_blocksize(struct loopdev_cxt *lc, uint64_t blocksize)
+{
+	if (!lc)
+		return -EINVAL;
+	lc->blocksize = blocksize;
+
+	DBG(CXT, ul_debugobj(lc, "set blocksize=%jd", blocksize));
+	return 0;
+}
+
+/*
+ * @lc: context
+ * @flags: kernel LO_FLAGS_{READ_ONLY,USE_AOPS,AUTOCLEAR} flags
+ *
+ * The setting is removed by loopcxt_set_device() loopcxt_next()!
+ *
+ * Returns: 0 on success, <0 on error.
+ */
+int loopcxt_set_flags(struct loopdev_cxt *lc, uint32_t flags)
+{
+	if (!lc)
+		return -EINVAL;
+	lc->config.info.lo_flags = flags;
+
+	DBG(CXT, ul_debugobj(lc, "set flags=%u", (unsigned) flags));
+	return 0;
+}
+
+/*
+ * @lc: context
+ * @filename: backing file path (the path will be canonicalized)
+ *
+ * The setting is removed by loopcxt_set_device() loopcxt_next()!
+ *
+ * Returns: 0 on success, <0 on error.
+ */
+int loopcxt_set_backing_file(struct loopdev_cxt *lc, const char *filename)
+{
+	if (!lc)
+		return -EINVAL;
+
+	lc->filename = canonicalize_path(filename);
+	if (!lc->filename)
+		return -errno;
+
+	xstrncpy((char *)lc->config.info.lo_file_name, lc->filename, LO_NAME_SIZE);
+
+	DBG(CXT, ul_debugobj(lc, "set backing file=%s", lc->config.info.lo_file_name));
+	return 0;
+}
+
+/*
+ * In kernels prior to v3.9, if the offset or sizelimit options
+ * are used, the block device's size won't be synced automatically.
+ * blockdev --getsize64 and filesystems will use the backing
+ * file size until the block device has been re-opened or the
+ * LOOP_SET_CAPACITY ioctl is called to sync the sizes.
+ *
+ * Since mount -oloop uses the LO_FLAGS_AUTOCLEAR option and passes
+ * the open file descriptor to the mount system call, we need to use
+ * the ioctl. Calling losetup directly doesn't have this problem since
+ * it closes the device when it exits and whatever consumes the device
+ * next will re-open it, causing the resync.
+ */
+static int loopcxt_check_size(struct loopdev_cxt *lc, int file_fd)
+{
+	uint64_t size, expected_size;
+	int dev_fd;
+	struct stat st;
+
+	if (!lc->config.info.lo_offset && !lc->config.info.lo_sizelimit)
+		return 0;
+
+	if (fstat(file_fd, &st)) {
+		DBG(CXT, ul_debugobj(lc, "failed to fstat backing file"));
+		return -errno;
+	}
+	if (S_ISBLK(st.st_mode)) {
+		if (blkdev_get_size(file_fd,
+				(unsigned long long *) &expected_size)) {
+			DBG(CXT, ul_debugobj(lc, "failed to determine device size"));
+			return -errno;
+		}
+	} else
+		expected_size = st.st_size;
+
+	if (expected_size == 0 || expected_size <= lc->config.info.lo_offset) {
+		DBG(CXT, ul_debugobj(lc, "failed to determine expected size"));
+		return 0;	/* ignore this error */
+	}
+
+	if (lc->config.info.lo_offset > 0)
+		expected_size -= lc->config.info.lo_offset;
+
+	if (lc->config.info.lo_sizelimit > 0 && lc->config.info.lo_sizelimit < expected_size)
+		expected_size = lc->config.info.lo_sizelimit;
+
+	dev_fd = loopcxt_get_fd(lc);
+	if (dev_fd < 0) {
+		DBG(CXT, ul_debugobj(lc, "failed to get loop FD"));
+		return -errno;
+	}
+
+	if (blkdev_get_size(dev_fd, (unsigned long long *) &size)) {
+		DBG(CXT, ul_debugobj(lc, "failed to determine loopdev size"));
+		return -errno;
+	}
+
+	/* It's block device, so, align to 512-byte sectors */
+	if (expected_size % 512) {
+		DBG(CXT, ul_debugobj(lc, "expected size misaligned to 512-byte sectors"));
+		expected_size = (expected_size >> 9) << 9;
+	}
+
+	if (expected_size != size) {
+		DBG(CXT, ul_debugobj(lc, "warning: loopdev and expected "
+				      "size mismatch (%ju/%ju)",
+				      size, expected_size));
+
+		if (loopcxt_ioctl_capacity(lc)) {
+			/* ioctl not available */
+			if (errno == ENOTTY || errno == EINVAL)
+				errno = ERANGE;
+			return -errno;
+		}
+
+		if (blkdev_get_size(dev_fd, (unsigned long long *) &size))
+			return -errno;
+
+		if (expected_size != size) {
+			errno = ERANGE;
+			DBG(CXT, ul_debugobj(lc, "failed to set loopdev size, "
+					"size: %ju, expected: %ju",
+					size, expected_size));
+			return -errno;
+		}
+	}
+
+	return 0;
+}
+
+
+/*
+ * @lc: context
+ *
+ * Associate the current device (see loopcxt_{set,get}_device()) with
+ * a file (see loopcxt_set_backing_file()).
+ *
+ * The device is initialized read-write by default. If you want read-only
+ * device then set LO_FLAGS_READ_ONLY by loopcxt_set_flags(). The LOOPDEV_FL_*
+ * flags are ignored and modified according to LO_FLAGS_*.
+ *
+ * If the device is already open by loopcxt_get_fd() then this setup device
+ * function will re-open the device to fix read/write mode.
+ *
+ * The device is also initialized read-only if the backing file is not
+ * possible to open read-write (e.g. read-only FS).
+ *
+ * Returns: <0 on error, 0 on success.
+ */
+int loopcxt_setup_device(struct loopdev_cxt *lc)
+{
+	int file_fd, dev_fd, mode = O_RDWR, flags = O_CLOEXEC;
+	int rc = -1, cnt = 0;
+	int errsv = 0;
+	int fallback = 0;
+
+	if (!lc || !*lc->device || !lc->filename)
+		return -EINVAL;
+
+	DBG(SETUP, ul_debugobj(lc, "device setup requested"));
+
+	/*
+	 * Open backing file and device
+	 */
+	if (lc->config.info.lo_flags & LO_FLAGS_READ_ONLY)
+		mode = O_RDONLY;
+
+	if (lc->config.info.lo_flags & LO_FLAGS_DIRECT_IO)
+		flags |= O_DIRECT;
+
+	if ((file_fd = open(lc->filename, mode | flags)) < 0) {
+		if (mode != O_RDONLY && (errno == EROFS || errno == EACCES))
+			file_fd = open(lc->filename, (mode = O_RDONLY) | flags);
+
+		if (file_fd < 0) {
+			DBG(SETUP, ul_debugobj(lc, "open backing file failed: %m"));
+			return -errno;
+		}
+	}
+	DBG(SETUP, ul_debugobj(lc, "backing file open: OK"));
+
+	if (lc->fd != -1 && lc->mode != mode) {
+		DBG(SETUP, ul_debugobj(lc, "closing already open device (mode mismatch)"));
+		close(lc->fd);
+		lc->fd = -1;
+		lc->mode = 0;
+	}
+
+	if (mode == O_RDONLY) {
+		lc->flags |= LOOPDEV_FL_RDONLY;			/* open() mode */
+		lc->config.info.lo_flags |= LO_FLAGS_READ_ONLY;	/* kernel loopdev mode */
+	} else {
+		lc->flags |= LOOPDEV_FL_RDWR;			/* open() mode */
+		lc->config.info.lo_flags &= ~LO_FLAGS_READ_ONLY;
+		lc->flags &= ~LOOPDEV_FL_RDONLY;
+	}
+
+	do {
+		errno = 0;
+		dev_fd = loopcxt_get_fd(lc);
+		if (dev_fd >= 0 || lc->control_ok == 0)
+			break;
+		if (errno != EACCES && errno != ENOENT)
+			break;
+		/* We have permissions to open /dev/loop-control, but open
+		 * /dev/loopN failed with EACCES, it's probably because udevd
+		 * does not applied chown yet. Let's wait a moment. */
+		xusleep(25000);
+	} while (cnt++ < 16);
+
+	if (dev_fd < 0) {
+		rc = -errno;
+		goto err;
+	}
+
+	DBG(SETUP, ul_debugobj(lc, "device open: OK"));
+
+	/*
+	 * Atomic way to configure all by one ioctl call
+	 * -- since Linux v5.8-rc1, commit 3448914e8cc550ba792d4ccc74471d1ca4293aae
+	 */
+	lc->config.fd = file_fd;
+	if (lc->blocksize > 0)
+		lc->config.block_size = lc->blocksize;
+
+	rc = repeat_on_eagain( ioctl(dev_fd, LOOP_CONFIGURE, &lc->config) );
+	if (rc != 0) {
+		errsv = errno;
+		if (errno != EINVAL && errno != ENOTTY && errno != ENOSYS) {
+			DBG(SETUP, ul_debugobj(lc, "LOOP_CONFIGURE failed: %m"));
+			goto err;
+		}
+		fallback = 1;
+	} else {
+		DBG(SETUP, ul_debugobj(lc, "LOOP_CONFIGURE: OK"));
+	}
+
+	/*
+	 * Old deprecated way; first assign backing file FD and then in the
+	 * second step set loop device properties.
+	 */
+	if (fallback) {
+		if (ioctl(dev_fd, LOOP_SET_FD, file_fd) < 0) {
+			rc = -errno;
+			errsv = errno;
+			DBG(SETUP, ul_debugobj(lc, "LOOP_SET_FD failed: %m"));
+			goto err;
+		}
+
+		DBG(SETUP, ul_debugobj(lc, "LOOP_SET_FD: OK"));
+
+		if (lc->blocksize > 0
+			&& (rc = loopcxt_ioctl_blocksize(lc, lc->blocksize)) < 0) {
+			errsv = -rc;
+			goto err;
+		}
+
+		if ((rc = loopcxt_ioctl_status(lc)) < 0) {
+			errsv = -rc;
+			goto err;
+		}
+	}
+
+	if ((rc = loopcxt_check_size(lc, file_fd)))
+		goto err;
+
+	close(file_fd);
+
+	memset(&lc->config, 0, sizeof(lc->config));
+	lc->has_info = 0;
+	lc->info_failed = 0;
+
+	DBG(SETUP, ul_debugobj(lc, "success [rc=0]"));
+	return 0;
+err:
+	if (file_fd >= 0)
+		close(file_fd);
+	if (dev_fd >= 0 && rc != -EBUSY)
+		ioctl(dev_fd, LOOP_CLR_FD, 0);
+	if (errsv)
+		errno = errsv;
+
+	DBG(SETUP, ul_debugobj(lc, "failed [rc=%d]", rc));
+	return rc;
+}
+
+
+/*
+ * @lc: context
+ *
+ * Update status of the current device (see loopcxt_{set,get}_device()).
+ *
+ * Note that once initialized, kernel accepts only selected changes:
+ * LO_FLAGS_AUTOCLEAR and LO_FLAGS_PARTSCAN
+ * For more see linux/drivers/block/loop.c:loop_set_status()
+ *
+ * Returns: <0 on error, 0 on success.
+ */
+int loopcxt_ioctl_status(struct loopdev_cxt *lc)
+{
+	int dev_fd, rc;
+
+	errno = 0;
+	dev_fd = loopcxt_get_fd(lc);
+
+	if (dev_fd < 0)
+		return -errno;
+
+	DBG(SETUP, ul_debugobj(lc, "calling LOOP_SET_STATUS64"));
+
+	rc = repeat_on_eagain( ioctl(dev_fd, LOOP_SET_STATUS64, &lc->config.info) );
+	if (rc != 0) {
+		DBG(SETUP, ul_debugobj(lc, "LOOP_SET_STATUS64 failed: %m"));
+		return rc;
+	}
+
+	DBG(SETUP, ul_debugobj(lc, "LOOP_SET_STATUS64: OK"));
+	return 0;
+}
+
+int loopcxt_ioctl_capacity(struct loopdev_cxt *lc)
+{
+	int rc, fd = loopcxt_get_fd(lc);
+
+	if (fd < 0)
+		return -EINVAL;
+
+	DBG(SETUP, ul_debugobj(lc, "calling LOOP_SET_CAPACITY"));
+
+	/* Kernels prior to v2.6.30 don't support this ioctl */
+	rc = repeat_on_eagain( ioctl(fd, LOOP_SET_CAPACITY, 0) );
+	if (rc != 0) {
+		DBG(CXT, ul_debugobj(lc, "LOOP_SET_CAPACITY failed: %m"));
+		return rc;
+	}
+
+	DBG(CXT, ul_debugobj(lc, "capacity set"));
+	return 0;
+}
+
+int loopcxt_ioctl_dio(struct loopdev_cxt *lc, unsigned long use_dio)
+{
+	int rc, fd = loopcxt_get_fd(lc);
+
+	if (fd < 0)
+		return -EINVAL;
+
+	DBG(SETUP, ul_debugobj(lc, "calling LOOP_SET_DIRECT_IO"));
+
+	/* Kernels prior to v4.4 don't support this ioctl */
+	rc = repeat_on_eagain( ioctl(fd, LOOP_SET_DIRECT_IO, use_dio) );
+	if (rc != 0) {
+		DBG(CXT, ul_debugobj(lc, "LOOP_SET_DIRECT_IO failed: %m"));
+		return rc;
+	}
+
+	DBG(CXT, ul_debugobj(lc, "direct io set"));
+	return 0;
+}
+
+/*
+ * Kernel uses "unsigned long" as ioctl arg, but we use u64 for all sizes to
+ * keep loopdev internal API simple.
+ */
+int loopcxt_ioctl_blocksize(struct loopdev_cxt *lc, uint64_t blocksize)
+{
+	int rc, fd = loopcxt_get_fd(lc);
+
+	if (fd < 0)
+		return -EINVAL;
+
+	DBG(SETUP, ul_debugobj(lc, "calling LOOP_SET_BLOCK_SIZE"));
+
+	rc = repeat_on_eagain(
+		ioctl(fd, LOOP_SET_BLOCK_SIZE, (unsigned long) blocksize) );
+	if (rc != 0) {
+		DBG(CXT, ul_debugobj(lc, "LOOP_SET_BLOCK_SIZE failed: %m"));
+		return rc;
+	}
+
+	DBG(CXT, ul_debugobj(lc, "logical block size set"));
+	return 0;
+}
+
+int loopcxt_delete_device(struct loopdev_cxt *lc)
+{
+	int rc, fd = loopcxt_get_fd(lc);
+
+	if (fd < 0)
+		return -EINVAL;
+
+	DBG(SETUP, ul_debugobj(lc, "calling LOOP_SET_CLR_FD"));
+
+	rc = repeat_on_eagain( ioctl(fd, LOOP_CLR_FD, 0) );
+	if (rc != 0) {
+		DBG(CXT, ul_debugobj(lc, "LOOP_CLR_FD failed: %m"));
+		return rc;
+	}
+
+	DBG(CXT, ul_debugobj(lc, "device removed"));
+	return 0;
+}
+
+int loopcxt_add_device(struct loopdev_cxt *lc)
+{
+	int rc = -EINVAL;
+	int ctl, nr = -1;
+	const char *p, *dev = loopcxt_get_device(lc);
+
+	if (!dev)
+		goto done;
+
+	if (!(lc->flags & LOOPDEV_FL_CONTROL)) {
+		rc = -ENOSYS;
+		goto done;
+	}
+
+	p = strrchr(dev, '/');
+	if (!p || (sscanf(p, "/loop%d", &nr) != 1 && sscanf(p, "/%d", &nr) != 1)
+	       || nr < 0)
+		goto done;
+
+	ctl = open(_PATH_DEV_LOOPCTL, O_RDWR|O_CLOEXEC);
+	if (ctl >= 0) {
+		DBG(CXT, ul_debugobj(lc, "add_device %d", nr));
+		rc = ioctl(ctl, LOOP_CTL_ADD, nr);
+		close(ctl);
+	}
+	lc->control_ok = rc >= 0 ? 1 : 0;
+done:
+	DBG(CXT, ul_debugobj(lc, "add_device done [rc=%d]", rc));
+	return rc;
+}
+
+/*
+ * Note that LOOP_CTL_GET_FREE ioctl is supported since kernel 3.1. In older
+ * kernels we have to check all loop devices to found unused one.
+ *
+ * See kernel commit 770fe30a46a12b6fb6b63fbe1737654d28e8484.
+ *
+ * Returns: 0 = success, < 0 error
+ */
+int loopcxt_find_unused(struct loopdev_cxt *lc)
+{
+	int rc = -1;
+
+	DBG(CXT, ul_debugobj(lc, "find_unused requested"));
+
+	if (lc->flags & LOOPDEV_FL_CONTROL) {
+		int ctl;
+
+		DBG(CXT, ul_debugobj(lc, "using loop-control"));
+
+		ctl = open(_PATH_DEV_LOOPCTL, O_RDWR|O_CLOEXEC);
+		if (ctl >= 0)
+			rc = ioctl(ctl, LOOP_CTL_GET_FREE);
+		else
+			rc = -errno;
+		if (rc >= 0) {
+			char name[16];
+			snprintf(name, sizeof(name), "loop%d", rc);
+
+			rc = loopiter_set_device(lc, name);
+		}
+		lc->control_ok = ctl >= 0 && rc == 0 ? 1 : 0;
+		if (ctl >= 0)
+			close(ctl);
+		DBG(CXT, ul_debugobj(lc, "find_unused by loop-control [rc=%d]", rc));
+	}
+
+	if (rc < 0) {
+		DBG(CXT, ul_debugobj(lc, "using loop scan"));
+		rc = loopcxt_init_iterator(lc, LOOPITER_FL_FREE);
+		if (rc)
+			return rc;
+
+		rc = loopcxt_next(lc);
+		loopcxt_deinit_iterator(lc);
+		DBG(CXT, ul_debugobj(lc, "find_unused by scan [rc=%d]", rc));
+		if (rc)
+			return -ENOENT;
+	}
+	return rc;
+}
+
+
+
+/*
+ * Return: TRUE/FALSE
+ */
+int loopdev_is_autoclear(const char *device)
+{
+	struct loopdev_cxt lc;
+	int rc;
+
+	if (!device)
+		return 0;
+
+	rc = loopcxt_init(&lc, 0);
+	if (!rc)
+		rc = loopcxt_set_device(&lc, device);
+	if (!rc)
+		rc = loopcxt_is_autoclear(&lc);
+
+	loopcxt_deinit(&lc);
+	return rc;
+}
+
+char *loopdev_get_backing_file(const char *device)
+{
+	struct loopdev_cxt lc;
+	char *res = NULL;
+
+	if (!device)
+		return NULL;
+	if (loopcxt_init(&lc, 0))
+		return NULL;
+	if (loopcxt_set_device(&lc, device) == 0)
+		res = loopcxt_get_backing_file(&lc);
+
+	loopcxt_deinit(&lc);
+	return res;
+}
+
+/*
+ * Returns: TRUE/FALSE
+ */
+int loopdev_has_backing_file(const char *device)
+{
+	char *tmp = loopdev_get_backing_file(device);
+
+	if (tmp) {
+		free(tmp);
+		return 1;
+	}
+	return 0;
+}
+
+/*
+ * Returns: TRUE/FALSE
+ */
+int loopdev_is_used(const char *device, const char *filename,
+		    uint64_t offset, uint64_t sizelimit, int flags)
+{
+	struct loopdev_cxt lc;
+	struct stat st;
+	int rc = 0;
+
+	if (!device || !filename)
+		return 0;
+
+	rc = loopcxt_init(&lc, 0);
+	if (!rc)
+		rc = loopcxt_set_device(&lc, device);
+	if (rc)
+		return rc;
+
+	rc = !stat(filename, &st);
+	rc = loopcxt_is_used(&lc, rc ? &st : NULL, filename, offset, sizelimit, flags);
+
+	loopcxt_deinit(&lc);
+	return rc;
+}
+
+/*
+ * Returns: 0 = success, < 0 error
+ */
+int loopdev_delete(const char *device)
+{
+	struct loopdev_cxt lc;
+	int rc;
+
+	if (!device)
+		return -EINVAL;
+
+	rc = loopcxt_init(&lc, 0);
+	if (!rc)
+		rc = loopcxt_set_device(&lc, device);
+	if (!rc)
+		rc = loopcxt_delete_device(&lc);
+	loopcxt_deinit(&lc);
+	return rc;
+}
+
+/*
+ * Returns: 0 = success, < 0 error, 1 not found
+ */
+int loopcxt_find_by_backing_file(struct loopdev_cxt *lc, const char *filename,
+				 uint64_t offset, uint64_t sizelimit, int flags)
+{
+	int rc, hasst;
+	struct stat st;
+
+	if (!filename)
+		return -EINVAL;
+
+	hasst = !stat(filename, &st);
+
+	rc = loopcxt_init_iterator(lc, LOOPITER_FL_USED);
+	if (rc)
+		return rc;
+
+	while ((rc = loopcxt_next(lc)) == 0) {
+
+		if (loopcxt_is_used(lc, hasst ? &st : NULL,
+				    filename, offset, sizelimit, flags))
+			break;
+	}
+
+	loopcxt_deinit_iterator(lc);
+	return rc;
+}
+
+/*
+ * Returns: 0 = not found, < 0 error, 1 found, 2 found full size and offset match
+ */
+int loopcxt_find_overlap(struct loopdev_cxt *lc, const char *filename,
+			   uint64_t offset, uint64_t sizelimit)
+{
+	int rc, hasst;
+	struct stat st;
+
+	if (!filename)
+		return -EINVAL;
+
+	DBG(CXT, ul_debugobj(lc, "find_overlap requested"));
+	hasst = !stat(filename, &st);
+
+	rc = loopcxt_init_iterator(lc, LOOPITER_FL_USED);
+	if (rc)
+		return rc;
+
+	while ((rc = loopcxt_next(lc)) == 0) {
+		uint64_t lc_sizelimit, lc_offset;
+
+		rc = loopcxt_is_used(lc, hasst ? &st : NULL,
+				     filename, offset, sizelimit, 0);
+		/*
+		 * Either the loopdev is unused or we've got an error which can
+		 * happen when we are racing with device autoclear. Just ignore
+		 * this loopdev...
+		 */
+		if (rc <= 0)
+			continue;
+
+		DBG(CXT, ul_debugobj(lc, "found %s backed by %s",
+			loopcxt_get_device(lc), filename));
+
+		rc = loopcxt_get_offset(lc, &lc_offset);
+		if (rc) {
+			DBG(CXT, ul_debugobj(lc, "failed to get offset for device %s",
+				loopcxt_get_device(lc)));
+			continue;
+		}
+		rc = loopcxt_get_sizelimit(lc, &lc_sizelimit);
+		if (rc) {
+			DBG(CXT, ul_debugobj(lc, "failed to get sizelimit for device %s",
+				loopcxt_get_device(lc)));
+			continue;
+		}
+
+		/* full match */
+		if (lc_sizelimit == sizelimit && lc_offset == offset) {
+			DBG(CXT, ul_debugobj(lc, "overlapping loop device %s (full match)",
+						loopcxt_get_device(lc)));
+			rc = 2;
+			goto found;
+		}
+
+		/* overlap */
+		if (lc_sizelimit != 0 && offset >= lc_offset + lc_sizelimit)
+			continue;
+		if (sizelimit != 0 && offset + sizelimit <= lc_offset)
+			continue;
+
+		DBG(CXT, ul_debugobj(lc, "overlapping loop device %s",
+			loopcxt_get_device(lc)));
+			rc = 1;
+			goto found;
+	}
+
+	if (rc == 1)
+		rc = 0;	/* not found */
+found:
+	loopcxt_deinit_iterator(lc);
+	DBG(CXT, ul_debugobj(lc, "find_overlap done [rc=%d]", rc));
+	return rc;
+}
+
+/*
+ * Returns allocated string with device name
+ */
+char *loopdev_find_by_backing_file(const char *filename, uint64_t offset, uint64_t sizelimit, int flags)
+{
+	struct loopdev_cxt lc;
+	char *res = NULL;
+
+	if (!filename)
+		return NULL;
+
+	if (loopcxt_init(&lc, 0))
+		return NULL;
+	if (loopcxt_find_by_backing_file(&lc, filename, offset, sizelimit, flags) == 0)
+		res = loopcxt_strdup_device(&lc);
+	loopcxt_deinit(&lc);
+
+	return res;
+}
+
+/*
+ * Returns number of loop devices associated with @file, if only one loop
+ * device is associated with the given @filename and @loopdev is not NULL then
+ * @loopdev returns name of the device.
+ */
+int loopdev_count_by_backing_file(const char *filename, char **loopdev)
+{
+	struct loopdev_cxt lc;
+	int count = 0, rc;
+
+	if (!filename)
+		return -1;
+
+	rc = loopcxt_init(&lc, 0);
+	if (rc)
+		return rc;
+	if (loopcxt_init_iterator(&lc, LOOPITER_FL_USED))
+		return -1;
+
+	while(loopcxt_next(&lc) == 0) {
+		char *backing = loopcxt_get_backing_file(&lc);
+
+		if (!backing || strcmp(backing, filename) != 0) {
+			free(backing);
+			continue;
+		}
+
+		free(backing);
+		if (loopdev && count == 0)
+			*loopdev = loopcxt_strdup_device(&lc);
+		count++;
+	}
+
+	loopcxt_deinit(&lc);
+
+	if (loopdev && count > 1) {
+		free(*loopdev);
+		*loopdev = NULL;
+	}
+	return count;
+}
+
+#ifdef TEST_PROGRAM_LOOPDEV
+int main(int argc, char *argv[])
+{
+	if (argc < 2)
+		goto usage;
+
+	if (strcmp(argv[1], "--is-loopdev") == 0 && argc == 3)
+		printf("%s: %s\n", argv[2], is_loopdev(argv[2]) ? "OK" : "FAIL");
+	else
+		goto usage;
+
+	return EXIT_SUCCESS;
+usage:
+	fprintf(stderr, "usage: %1$s --is-loopdev <dev>\n",
+			program_invocation_short_name);
+	return EXIT_FAILURE;
+}
+#endif
+
diff --git a/lib/mangle.c b/lib/mangle.c
new file mode 100644
index 0000000..1a3b89a
--- /dev/null
+++ b/lib/mangle.c
@@ -0,0 +1,169 @@
+/*
+ * Functions for \oct encoding used in mtab/fstab/swaps/etc.
+ *
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Copyright (C) 2010 Karel Zak <kzak@redhat.com>
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+#include "mangle.h"
+#include "c.h"
+
+#define isoctal(a)		(((a) & ~7) == '0')
+
+#define from_hex(c)		(isdigit(c) ? c - '0' : tolower(c) - 'a' + 10)
+
+#define is_unwanted_char(x)	(strchr(" \t\n\\", (unsigned int) x) != NULL)
+
+
+char *mangle(const char *s)
+{
+	char *ss, *sp;
+
+	if (!s)
+		return NULL;
+
+	ss = sp = malloc(4 * strlen(s) + 1);
+	if (!sp)
+		return NULL;
+	while(1) {
+		if (!*s) {
+			*sp = '\0';
+			break;
+		}
+		if (is_unwanted_char(*s)) {
+			*sp++ = '\\';
+			*sp++ = '0' + ((*s & 0300) >> 6);
+			*sp++ = '0' + ((*s & 070) >> 3);
+			*sp++ = '0' + (*s & 07);
+		} else
+			*sp++ = *s;
+		s++;
+	}
+	return ss;
+}
+
+
+void unmangle_to_buffer(const char *s, char *buf, size_t len)
+{
+	size_t sz = 0;
+
+	if (!s)
+		return;
+
+	while(*s && sz < len - 1) {
+		if (*s == '\\' && sz + 3 < len - 1 && isoctal(s[1]) &&
+		    isoctal(s[2]) && isoctal(s[3])) {
+
+			*buf++ = 64*(s[1] & 7) + 8*(s[2] & 7) + (s[3] & 7);
+			s += 4;
+			sz += 4;
+		} else {
+			*buf++ = *s++;
+			sz++;
+		}
+	}
+	*buf = '\0';
+}
+
+size_t unhexmangle_to_buffer(const char *s, char *buf, size_t len)
+{
+	size_t sz = 0;
+	const char *buf0 = buf;
+
+	if (!s)
+		return 0;
+
+	while(*s && sz < len - 1) {
+		if (*s == '\\' && sz + 3 < len - 1 && s[1] == 'x' &&
+		    isxdigit(s[2]) && isxdigit(s[3])) {
+
+			*buf++ = from_hex(s[2]) << 4 | from_hex(s[3]);
+			s += 4;
+			sz += 4;
+		} else {
+			*buf++ = *s++;
+			sz++;
+		}
+	}
+	*buf = '\0';
+	return buf - buf0 + 1;
+}
+
+static inline const char *skip_nonspaces(const char *s)
+{
+	while (s && *s && !(*s == ' ' || *s == '\t'))
+		s++;
+	return s;
+}
+
+/*
+ * Returns mallocated buffer or NULL in case of error.
+ */
+char *unmangle(const char *s, const char **end)
+{
+	char *buf;
+	const char *e;
+	size_t sz;
+
+	if (!s)
+		return NULL;
+
+	e = skip_nonspaces(s);
+	sz = e - s + 1;
+
+	if (end)
+		*end = e;
+	if (e == s)
+		return NULL;	/* empty string */
+
+	buf = malloc(sz);
+	if (!buf)
+		return NULL;
+
+	unmangle_to_buffer(s, buf, sz);
+	return buf;
+}
+
+#ifdef TEST_PROGRAM_MANGLE
+#include <errno.h>
+int main(int argc, char *argv[])
+{
+	char *p = NULL;
+	if (argc < 3) {
+		fprintf(stderr, "usage: %s --mangle|unmangle <string>\n",
+						program_invocation_short_name);
+		return EXIT_FAILURE;
+	}
+
+	if (!strcmp(argv[1], "--mangle")) {
+		p = mangle(argv[2]);
+		printf("mangled: '%s'\n", p);
+		free(p);
+	}
+
+	else if (!strcmp(argv[1], "--unmangle")) {
+		char *x = unmangle(argv[2], NULL);
+
+		if (x) {
+			printf("unmangled: '%s'\n", x);
+			free(x);
+		}
+
+		x = strdup(argv[2]);
+		if (x) {
+			unmangle_to_buffer(x, x, strlen(x) + 1);
+
+			printf("self-unmangled: '%s'\n", x);
+			free(x);
+		}
+	}
+
+	return EXIT_SUCCESS;
+}
+#endif /* TEST_PROGRAM_MANGLE */
diff --git a/lib/match.c b/lib/match.c
new file mode 100644
index 0000000..a286a19
--- /dev/null
+++ b/lib/match.c
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2011 Karel Zak <kzak@redhat.com>
+ *
+ * This file may be redistributed under the terms of the
+ * GNU Lesser General Public License.
+ */
+
+#include <string.h>
+
+#include "match.h"
+
+/*
+ * match_fstype:
+ * @type: filesystem type
+ * @pattern: filesystem name or comma delimited list of names
+ *
+ * The @pattern list of filesystem can be prefixed with a global
+ * "no" prefix to invert matching of the whole list. The "no" could
+ * also be used for individual items in the @pattern list. So,
+ * "nofoo,bar" has the same meaning as "nofoo,nobar".
+ */
+int match_fstype(const char *type, const char *pattern)
+{
+	int no = 0;		/* negated types list */
+	int len;
+	const char *p;
+
+	if (!pattern && !type)
+		return 1;
+	if (!pattern)
+		return 0;
+
+	if (!strncmp(pattern, "no", 2)) {
+		no = 1;
+		pattern += 2;
+	}
+
+	/* Does type occur in types, separated by commas? */
+	len = strlen(type);
+	p = pattern;
+	while(1) {
+		if (!strncmp(p, "no", 2) && !strncasecmp(p+2, type, len) &&
+		    (p[len+2] == 0 || p[len+2] == ','))
+			return 0;
+		if (strncasecmp(p, type, len) == 0 && (p[len] == 0 || p[len] == ','))
+			return !no;
+		p = strchr(p,',');
+		if (!p)
+			break;
+		p++;
+	}
+	return no;
+}
diff --git a/lib/mbsalign.c b/lib/mbsalign.c
new file mode 100644
index 0000000..7b8f5a6
--- /dev/null
+++ b/lib/mbsalign.c
@@ -0,0 +1,621 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * Align/Truncate a string in a given screen width
+ * Copyright (C) 2009-2010 Free Software Foundation, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 2.1 of the License, or (at your
+ * option) any later version.
+ *
+ * Written by Pádraig Brady.
+ */
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <limits.h>
+#include <ctype.h>
+
+#include "c.h"
+#include "mbsalign.h"
+#include "strutils.h"
+#include "widechar.h"
+
+/*
+ * Counts number of cells in multibyte string. All control and
+ * non-printable chars are ignored.
+ *
+ * Returns: number of cells.
+ */
+size_t mbs_nwidth(const char *buf, size_t bufsz)
+{
+	const char *p = buf, *last = buf;
+	size_t width = 0;
+
+#ifdef HAVE_WIDECHAR
+	mbstate_t st;
+	memset(&st, 0, sizeof(st));
+#endif
+	if (p && *p && bufsz)
+		last = p + (bufsz - 1);
+
+	while (p && *p && p <= last) {
+		if (iscntrl((unsigned char) *p)) {
+			p++;
+
+			/* try detect "\e[x;ym" and skip on success */
+			if (*p && *p == '[') {
+				const char *e = p;
+				while (*e && e < last && *e != 'm')
+					e++;
+				if (*e == 'm')
+					p = e + 1;
+			}
+			continue;
+		}
+#ifdef HAVE_WIDECHAR
+		wchar_t wc;
+		size_t len = mbrtowc(&wc, p, MB_CUR_MAX, &st);
+
+		if (len == 0)
+			break;
+		if (len > 0 && iswprint(wc)) {
+			int x = wcwidth(wc);
+			if (x > 0)
+				width += x;
+		} else if (len == (size_t) -1 || len == (size_t) -2)
+			len = 1;
+		p += len;
+#else
+		if (isprint((unsigned char) *p))
+			width++;
+		p++;
+#endif
+	}
+
+	return width;
+}
+
+size_t mbs_width(const char *s)
+{
+	if (!s || !*s)
+		return 0;
+	return mbs_nwidth(s, strlen(s));
+}
+
+/*
+ * Counts number of cells in multibyte string. For all control and
+ * non-printable chars is the result width enlarged to store \x?? hex
+ * sequence. See mbs_safe_encode().
+ *
+ * Returns: number of cells, @sz returns number of bytes.
+ */
+size_t mbs_safe_nwidth(const char *buf, size_t bufsz, size_t *sz)
+{
+	const char *p = buf, *last = buf;
+	size_t width = 0, bytes = 0;
+
+#ifdef HAVE_WIDECHAR
+	mbstate_t st;
+	memset(&st, 0, sizeof(st));
+#endif
+	if (p && *p && bufsz)
+		last = p + (bufsz - 1);
+
+	while (p && *p && p <= last) {
+		if ((p < last && *p == '\\' && *(p + 1) == 'x')
+		    || iscntrl((unsigned char) *p)) {
+			width += 4, bytes += 4;		/* *p encoded to \x?? */
+			p++;
+		}
+#ifdef HAVE_WIDECHAR
+		else {
+			wchar_t wc;
+			size_t len = mbrtowc(&wc, p, MB_CUR_MAX, &st);
+
+			if (len == 0)
+				break;
+
+			if (len == (size_t) -1 || len == (size_t) -2) {
+				len = 1;
+				if (isprint((unsigned char) *p))
+					width += 1, bytes += 1;
+				else
+					width += 4, bytes += 4;
+
+			} else if (!iswprint(wc)) {
+				width += len * 4;	/* hex encode whole sequence */
+				bytes += len * 4;
+			} else {
+				width += wcwidth(wc);	/* number of cells */
+				bytes += len;		/* number of bytes */
+			}
+			p += len;
+		}
+#else
+		else if (!isprint((unsigned char) *p)) {
+			width += 4, bytes += 4;		/* *p encoded to \x?? */
+			p++;
+		} else {
+			width++, bytes++;
+			p++;
+		}
+#endif
+	}
+
+	if (sz)
+		*sz = bytes;
+	return width;
+}
+
+size_t mbs_safe_width(const char *s)
+{
+	if (!s || !*s)
+		return 0;
+	return mbs_safe_nwidth(s, strlen(s), NULL);
+}
+
+/*
+ * Copy @s to @buf and replace control and non-printable chars with
+ * \x?? hex sequence. The @width returns number of cells. The @safechars
+ * are not encoded.
+ *
+ * The @buf has to be big enough to store mbs_safe_encode_size(strlen(s)))
+ * bytes.
+ */
+char *mbs_safe_encode_to_buffer(const char *s, size_t *width, char *buf, const char *safechars)
+{
+	const char *p = s;
+	char *r;
+	size_t sz = s ? strlen(s) : 0;
+
+#ifdef HAVE_WIDECHAR
+	mbstate_t st;
+	memset(&st, 0, sizeof(st));
+#endif
+	if (!sz || !buf)
+		return NULL;
+
+	r = buf;
+	*width = 0;
+
+	while (p && *p) {
+		if (safechars && strchr(safechars, *p)) {
+			*r++ = *p++;
+			continue;
+		}
+
+		if ((*p == '\\' && *(p + 1) == 'x')
+		    || iscntrl((unsigned char) *p)) {
+			sprintf(r, "\\x%02x", (unsigned char) *p);
+			r += 4;
+			*width += 4;
+			p++;
+		}
+#ifdef HAVE_WIDECHAR
+		else {
+			wchar_t wc;
+			size_t len = mbrtowc(&wc, p, MB_CUR_MAX, &st);
+
+			if (len == 0)
+				break;		/* end of string */
+
+			if (len == (size_t) -1 || len == (size_t) -2) {
+				len = 1;
+				/*
+				 * Not valid multibyte sequence -- maybe it's
+				 * printable char according to the current locales.
+				 */
+				if (!isprint((unsigned char) *p)) {
+					sprintf(r, "\\x%02x", (unsigned char) *p);
+					r += 4;
+					*width += 4;
+				} else {
+					(*width)++;
+					*r++ = *p;
+				}
+			} else if (!iswprint(wc)) {
+				size_t i;
+				for (i = 0; i < len; i++) {
+					sprintf(r, "\\x%02x", (unsigned char) p[i]);
+					r += 4;
+					*width += 4;
+				}
+			} else {
+				memcpy(r, p, len);
+				r += len;
+				*width += wcwidth(wc);
+			}
+			p += len;
+		}
+#else
+		else if (!isprint((unsigned char) *p)) {
+			sprintf(r, "\\x%02x", (unsigned char) *p);
+			p++;
+			r += 4;
+			*width += 4;
+		} else {
+			*r++ = *p++;
+			(*width)++;
+		}
+#endif
+	}
+
+	*r = '\0';
+	return buf;
+}
+
+/*
+ * Copy @s to @buf and replace broken sequences to \x?? hex sequence. The
+ * @width returns number of cells. The @safechars are not encoded.
+ *
+ * The @buf has to be big enough to store mbs_safe_encode_size(strlen(s)))
+ * bytes.
+ */
+char *mbs_invalid_encode_to_buffer(const char *s, size_t *width, char *buf)
+{
+	const char *p = s;
+	char *r;
+	size_t sz = s ? strlen(s) : 0;
+
+#ifdef HAVE_WIDECHAR
+	mbstate_t st;
+	memset(&st, 0, sizeof(st));
+#endif
+	if (!sz || !buf)
+		return NULL;
+
+	r = buf;
+	*width = 0;
+
+	while (p && *p) {
+#ifdef HAVE_WIDECHAR
+		wchar_t wc;
+		size_t len = mbrtowc(&wc, p, MB_CUR_MAX, &st);
+#else
+		size_t len = 1;
+#endif
+
+		if (len == 0)
+			break;		/* end of string */
+
+		if (len == (size_t) -1 || len == (size_t) -2) {
+			len = 1;
+			/*
+			 * Not valid multibyte sequence -- maybe it's
+			 * printable char according to the current locales.
+			 */
+			if (!isprint((unsigned char) *p)) {
+				sprintf(r, "\\x%02x", (unsigned char) *p);
+				r += 4;
+				*width += 4;
+			} else {
+				(*width)++;
+				*r++ = *p;
+			}
+		} else if (*p == '\\' && *(p + 1) == 'x') {
+			sprintf(r, "\\x%02x", (unsigned char) *p);
+			r += 4;
+			*width += 4;
+		} else {
+			r = mempcpy(r, p, len);
+			*width += wcwidth(wc);
+		}
+		p += len;
+	}
+
+	*r = '\0';
+	return buf;
+}
+
+size_t mbs_safe_encode_size(size_t bytes)
+{
+	return (bytes * 4) + 1;
+}
+
+/*
+ * Returns allocated string where all control and non-printable chars are
+ * replaced with \x?? hex sequence.
+ */
+char *mbs_safe_encode(const char *s, size_t *width)
+{
+	size_t sz = s ? strlen(s) : 0;
+	char *buf, *ret = NULL;
+
+	if (!sz)
+		return NULL;
+	buf = malloc(mbs_safe_encode_size(sz));
+	if (buf)
+		ret = mbs_safe_encode_to_buffer(s, width, buf, NULL);
+	if (!ret)
+		free(buf);
+	return ret;
+}
+
+/*
+ * Returns allocated string where all broken widechars chars are
+ * replaced with \x?? hex sequence.
+ */
+char *mbs_invalid_encode(const char *s, size_t *width)
+{
+	size_t sz = s ? strlen(s) : 0;
+	char *buf, *ret = NULL;
+
+	if (!sz)
+		return NULL;
+	buf = malloc(mbs_safe_encode_size(sz));
+	if (buf)
+		ret = mbs_invalid_encode_to_buffer(s, width, buf);
+	if (!ret)
+		free(buf);
+	return ret;
+}
+
+#ifdef HAVE_WIDECHAR
+
+static bool
+wc_ensure_printable (wchar_t *wchars)
+{
+  bool replaced = false;
+  wchar_t *wc = wchars;
+  while (*wc)
+    {
+      if (!iswprint ((wint_t) *wc))
+        {
+          *wc = 0xFFFD; /* L'\uFFFD' (replacement char) */
+          replaced = true;
+        }
+      wc++;
+    }
+  return replaced;
+}
+
+/* Truncate wchar string to width cells.
+ * Returns number of cells used.  */
+
+static size_t
+wc_truncate (wchar_t *wc, size_t width)
+{
+  size_t cells = 0;
+  int next_cells = 0;
+
+  while (*wc)
+    {
+      next_cells = wcwidth (*wc);
+      if (next_cells == -1) /* non printable */
+        {
+          *wc = 0xFFFD; /* L'\uFFFD' (replacement char) */
+          next_cells = 1;
+        }
+      if (cells + next_cells > width)
+        break;
+
+      cells += next_cells;
+      wc++;
+    }
+  *wc = L'\0';
+  return cells;
+}
+
+static int
+rpl_wcswidth (const wchar_t *s, size_t n)
+{
+  int ret = 0;
+
+  while (n-- > 0 && *s != L'\0')
+    {
+      int nwidth = wcwidth (*s++);
+      if (nwidth == -1)             /* non printable */
+        return -1;
+      if (ret > (INT_MAX - nwidth)) /* overflow */
+        return -1;
+      ret += nwidth;
+    }
+
+  return ret;
+}
+#endif /* HAVE_WIDECHAR */
+
+/* Truncate multi-byte string to @width and returns number of
+ * bytes of the new string @str, and in @width returns number
+ * of cells.
+ */
+size_t
+mbs_truncate(char *str, size_t *width)
+{
+	ssize_t bytes = strlen(str);
+#ifdef HAVE_WIDECHAR
+	ssize_t sz = mbstowcs(NULL, str, 0);
+	wchar_t *wcs = NULL;
+
+	if (sz == (ssize_t) -1)
+		goto done;
+
+	wcs = calloc(1, (sz + 1) * sizeof(wchar_t));
+	if (!wcs)
+		goto done;
+
+	if (!mbstowcs(wcs, str, sz))
+		goto done;
+	*width = wc_truncate(wcs, *width);
+	bytes = wcstombs(str, wcs, bytes);
+done:
+	free(wcs);
+#else
+	if (bytes >= 0 && *width < (size_t) bytes)
+		bytes = *width;
+#endif
+	if (bytes >= 0)
+		str[bytes] = '\0';
+	return bytes;
+}
+
+/* Write N_SPACES space characters to DEST while ensuring
+   nothing is written beyond DEST_END. A terminating NUL
+   is always added to DEST.
+   A pointer to the terminating NUL is returned.  */
+
+static char*
+mbs_align_pad (char *dest, const char* dest_end, size_t n_spaces, int padchar)
+{
+  for (/* nothing */; n_spaces && (dest < dest_end); n_spaces--)
+    *dest++ = padchar;
+  *dest = '\0';
+  return dest;
+}
+
+size_t
+mbsalign (const char *src, char *dest, size_t dest_size,
+          size_t *width, mbs_align_t align, int flags)
+{
+	return mbsalign_with_padding(src, dest, dest_size, width, align, flags, ' ');
+}
+
+/* Align a string, SRC, in a field of *WIDTH columns, handling multi-byte
+   characters; write the result into the DEST_SIZE-byte buffer, DEST.
+   ALIGNMENT specifies whether to left- or right-justify or to center.
+   If SRC requires more than *WIDTH columns, truncate it to fit.
+   When centering, the number of trailing spaces may be one less than the
+   number of leading spaces. The FLAGS parameter is unused at present.
+   Return the length in bytes required for the final result, not counting
+   the trailing NUL.  A return value of DEST_SIZE or larger means there
+   wasn't enough space.  DEST will be NUL terminated in any case.
+   Return (size_t) -1 upon error (invalid multi-byte sequence in SRC,
+   or malloc failure), unless MBA_UNIBYTE_FALLBACK is specified.
+   Update *WIDTH to indicate how many columns were used before padding.  */
+
+size_t
+mbsalign_with_padding (const char *src, char *dest, size_t dest_size,
+	               size_t *width, mbs_align_t align,
+#ifdef HAVE_WIDECHAR
+		       int flags,
+#else
+		       int flags __attribute__((__unused__)),
+#endif
+		       int padchar)
+{
+  size_t ret = -1;
+  size_t src_size = strlen (src) + 1;
+  char *newstr = NULL;
+  wchar_t *str_wc = NULL;
+  const char *str_to_print = src;
+  size_t n_cols = src_size - 1;
+  size_t n_used_bytes = n_cols; /* Not including NUL */
+  size_t n_spaces = 0, space_left;
+
+#ifdef HAVE_WIDECHAR
+  bool conversion = false;
+  bool wc_enabled = false;
+
+  /* In multi-byte locales convert to wide characters
+     to allow easy truncation. Also determine number
+     of screen columns used.  */
+  if (MB_CUR_MAX > 1)
+    {
+      size_t src_chars = mbstowcs (NULL, src, 0);
+      if (src_chars == (size_t) -1)
+        {
+          if (flags & MBA_UNIBYTE_FALLBACK)
+            goto mbsalign_unibyte;
+          else
+            goto mbsalign_cleanup;
+        }
+      src_chars += 1; /* make space for NUL */
+      str_wc = malloc (src_chars * sizeof (wchar_t));
+      if (str_wc == NULL)
+        {
+          if (flags & MBA_UNIBYTE_FALLBACK)
+            goto mbsalign_unibyte;
+          else
+            goto mbsalign_cleanup;
+        }
+      if (mbstowcs (str_wc, src, src_chars) != 0)
+        {
+          str_wc[src_chars - 1] = L'\0';
+          wc_enabled = true;
+          conversion = wc_ensure_printable (str_wc);
+          n_cols = rpl_wcswidth (str_wc, src_chars);
+        }
+    }
+
+  /* If we transformed or need to truncate the source string
+     then create a modified copy of it.  */
+  if (wc_enabled && (conversion || (n_cols > *width)))
+    {
+        if (conversion)
+          {
+             /* May have increased the size by converting
+                \t to \uFFFD for example.  */
+            src_size = wcstombs(NULL, str_wc, 0) + 1;
+          }
+        newstr = malloc (src_size);
+        if (newstr == NULL)
+        {
+          if (flags & MBA_UNIBYTE_FALLBACK)
+            goto mbsalign_unibyte;
+          else
+            goto mbsalign_cleanup;
+        }
+        str_to_print = newstr;
+        n_cols = wc_truncate (str_wc, *width);
+        n_used_bytes = wcstombs (newstr, str_wc, src_size);
+    }
+
+mbsalign_unibyte:
+#endif
+
+  if (n_cols > *width) /* Unibyte truncation required.  */
+    {
+      n_cols = *width;
+      n_used_bytes = n_cols;
+    }
+
+  if (*width > n_cols) /* Padding required.  */
+    n_spaces = *width - n_cols;
+
+  /* indicate to caller how many cells needed (not including padding).  */
+  *width = n_cols;
+
+  /* indicate to caller how many bytes needed (not including NUL).  */
+  ret = n_used_bytes + (n_spaces * 1);
+
+  /* Write as much NUL terminated output to DEST as possible.  */
+  if (dest_size != 0)
+    {
+      char *dest_end = dest + dest_size - 1;
+      size_t start_spaces;
+      size_t end_spaces;
+
+      switch (align)
+        {
+        case MBS_ALIGN_CENTER:
+          start_spaces = n_spaces / 2 + n_spaces % 2;
+          end_spaces = n_spaces / 2;
+          break;
+        case MBS_ALIGN_LEFT:
+          start_spaces = 0;
+          end_spaces = n_spaces;
+          break;
+        case MBS_ALIGN_RIGHT:
+          start_spaces = n_spaces;
+          end_spaces = 0;
+          break;
+	default:
+	  abort();
+        }
+
+      dest = mbs_align_pad (dest, dest_end, start_spaces, padchar);
+      space_left = dest_end - dest;
+      dest = mempcpy (dest, str_to_print, min (n_used_bytes, space_left));
+      mbs_align_pad (dest, dest_end, end_spaces, padchar);
+    }
+#ifdef HAVE_WIDECHAR
+mbsalign_cleanup:
+#endif
+  free (str_wc);
+  free (newstr);
+
+  return ret;
+}
diff --git a/lib/mbsedit.c b/lib/mbsedit.c
new file mode 100644
index 0000000..ecfa9f4
--- /dev/null
+++ b/lib/mbsedit.c
@@ -0,0 +1,227 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * Very simple multibyte buffer editor. Allows to maintaine the current
+ * position in the string, add and remove chars on the current position.
+ *
+ * This file may be distributed under the terms of the
+ * GNU Lesser General Public License.
+ *
+ * Copyright (C) 2017 Karel Zak <kzak@redhat.com>
+ */
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <stdio.h>
+
+#include "mbsalign.h"
+#include "mbsedit.h"
+
+struct mbs_editor *mbs_new_edit(char *buf, size_t bufsz, size_t ncells)
+{
+	struct mbs_editor *edit = calloc(1, sizeof(*edit));
+
+	if (edit) {
+		edit->buf = buf;
+		edit->max_bytes = bufsz;
+		edit->max_cells = ncells;
+		edit->cur_cells = mbs_safe_width(buf);
+		edit->cur_bytes = strlen(buf);
+	}
+	return edit;
+}
+
+char *mbs_free_edit(struct mbs_editor *edit)
+{
+	char *ret = edit ? edit->buf : NULL;
+
+	free(edit);
+	return ret;
+}
+
+static size_t mbs_next(const char *str, size_t *ncells)
+{
+#ifdef HAVE_WIDECHAR
+	wchar_t wc;
+	size_t n = 0;
+
+	if (!str || !*str)
+		return 0;
+
+	n = mbrtowc(&wc, str, MB_CUR_MAX, NULL);
+	*ncells = wcwidth(wc);
+	return n;
+#else
+	if (!str || !*str)
+		return 0;
+	*ncells = 1;
+	return 1;
+#endif
+}
+
+static size_t mbs_prev(const char *start, const char *end, size_t *ncells)
+{
+#ifdef HAVE_WIDECHAR
+	wchar_t wc = 0;
+	const char *p, *prev;
+	size_t n = 0;
+
+	if (!start || !end || start == end || !*start)
+		return 0;
+
+	prev = p = start;
+	while (p < end) {
+		n = mbrtowc(&wc, p, MB_CUR_MAX, NULL);
+		prev = p;
+
+		if (n == (size_t) -1 || n == (size_t) -2)
+			p++;
+		else
+			p += n;
+	}
+
+	if (prev == end)
+		return 0;
+	*ncells = wcwidth(wc);
+	return n;
+#else
+	if (!start || !end || start == end || !*start)
+		return 0;
+	*ncells = 1;
+	return 1;
+#endif
+}
+
+int mbs_edit_goto(struct mbs_editor *edit, int where)
+{
+	switch (where) {
+	case MBS_EDIT_LEFT:
+		if (edit->cursor == 0)
+			return 1;
+		else {
+			size_t n, cells;
+			n = mbs_prev(edit->buf, edit->buf + edit->cursor, &cells);
+			if (n) {
+				edit->cursor -= n;
+				edit->cursor_cells -= cells;
+			}
+		}
+		break;
+	case MBS_EDIT_RIGHT:
+		if (edit->cursor_cells >= edit->cur_cells)
+			return 1;
+		else {
+			size_t n, cells;
+			n = mbs_next(edit->buf + edit->cursor, &cells);
+			if (n) {
+				edit->cursor += n;
+				edit->cursor_cells += cells;
+			}
+		}
+		break;
+	case MBS_EDIT_HOME:
+		edit->cursor = 0;
+		edit->cursor_cells = 0;
+		break;
+	case MBS_EDIT_END:
+		edit->cursor = edit->cur_bytes;
+		edit->cursor_cells = edit->cur_cells;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+/* Remove next MB from @str, returns number of removed bytes */
+static size_t remove_next(char *str, size_t *ncells)
+{
+	/* all in bytes! */
+	size_t bytes, move_bytes, n;
+
+	n          = mbs_next(str, ncells);
+	bytes      = strlen(str);
+	move_bytes = bytes - n;
+
+	memmove(str, str + n, move_bytes);
+	str[bytes - n] = '\0';
+	return n;
+}
+
+static size_t mbs_insert(char *str, wint_t c, size_t *ncells)
+{
+	/* all in bytes! */
+	size_t n = 1, bytes;
+	char *in;
+
+#ifdef HAVE_WIDECHAR
+	wchar_t wc = (wchar_t) c;
+	char in_buf[MB_CUR_MAX];
+
+	n = wctomb(in_buf, wc);
+	if (n == (size_t) -1)
+		return n;
+	*ncells = wcwidth(wc);
+	in = in_buf;
+#else
+	*ncells = 1;
+	in = (char *) &c;
+#endif
+	bytes       = strlen(str);
+
+	memmove(str + n, str, bytes);
+	memcpy(str, in, n);
+	str[bytes + n] = '\0';
+	return n;
+}
+
+static int mbs_edit_remove(struct mbs_editor *edit)
+{
+	size_t n, ncells;
+
+	if (edit->cur_cells == 0 || edit->cursor >= edit->cur_bytes)
+		return 1;
+
+	n = remove_next(edit->buf + edit->cursor, &ncells);
+	if (n == (size_t)-1)
+		return 1;
+
+	edit->cur_bytes -= n;
+	edit->cur_cells = mbs_safe_width(edit->buf);
+	return 0;
+}
+
+int mbs_edit_delete(struct mbs_editor *edit)
+{
+	if (edit->cursor >= edit->cur_bytes
+	    && mbs_edit_goto(edit, MBS_EDIT_LEFT) == 1)
+		return 1;
+
+	return mbs_edit_remove(edit);
+}
+
+int mbs_edit_backspace(struct mbs_editor *edit)
+{
+	if (mbs_edit_goto(edit, MBS_EDIT_LEFT) == 0)
+		return mbs_edit_remove(edit);
+	return 1;
+}
+
+int mbs_edit_insert(struct mbs_editor *edit, wint_t c)
+{
+	size_t n, ncells;
+
+	if (edit->cur_bytes + MB_CUR_MAX > edit->max_bytes)
+		return 1;
+
+	n = mbs_insert(edit->buf + edit->cursor, c, &ncells);
+	if (n == (size_t)-1)
+		return 1;
+
+	edit->cursor += n;
+	edit->cursor_cells += ncells;
+	edit->cur_bytes += n;
+	edit->cur_cells = mbs_safe_width(edit->buf);
+	return 0;
+}
diff --git a/lib/md5.c b/lib/md5.c
new file mode 100644
index 0000000..eedc71b
--- /dev/null
+++ b/lib/md5.c
@@ -0,0 +1,257 @@
+/*
+ * This code implements the MD5 message-digest algorithm.
+ * The algorithm is due to Ron Rivest.  This code was
+ * written by Colin Plumb in 1993, no copyright is claimed.
+ * This code is in the public domain; do with it what you wish.
+ *
+ * Equivalent code is available from RSA Data Security, Inc.
+ * This code has been tested against that, and is equivalent,
+ * except that you don't need to include two pages of legalese
+ * with every copy.
+ *
+ * To compute the message digest of a chunk of bytes, declare an
+ * MD5Context structure, pass it to MD5Init, call MD5Update as
+ * needed on buffers full of bytes, and then call MD5Final, which
+ * will fill a supplied 16-byte array with the digest.
+ */
+#include <string.h>		/* for memcpy() */
+
+#include "md5.h"
+
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+# define byteReverse(buf, len)	/* Nothing */
+#else
+static void byteReverse(unsigned char *buf, unsigned longs);
+
+#ifndef ASM_MD5
+/*
+ * Note: this code is harmless on little-endian machines.
+ */
+static void byteReverse(unsigned char *buf, unsigned longs)
+{
+    uint32_t t;
+    do {
+	t = (uint32_t) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
+	    ((unsigned) buf[1] << 8 | buf[0]);
+	*(uint32_t *) buf = t;
+	buf += 4;
+    } while (--longs);
+}
+#endif /* !ASM_MD5 */
+#endif /* __ORDER_LITTLE_ENDIAN__ */
+
+/*
+ * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
+ * initialization constants.
+ */
+void ul_MD5Init(struct UL_MD5Context *ctx)
+{
+    ctx->buf[0] = 0x67452301;
+    ctx->buf[1] = 0xefcdab89;
+    ctx->buf[2] = 0x98badcfe;
+    ctx->buf[3] = 0x10325476;
+
+    ctx->bits[0] = 0;
+    ctx->bits[1] = 0;
+}
+
+/*
+ * Update context to reflect the concatenation of another buffer full
+ * of bytes.
+ */
+void ul_MD5Update(struct UL_MD5Context *ctx, unsigned char const *buf, unsigned len)
+{
+    uint32_t t;
+
+    /* Update bitcount */
+
+    t = ctx->bits[0];
+    if ((ctx->bits[0] = t + ((uint32_t) len << 3)) < t)
+	ctx->bits[1]++;		/* Carry from low to high */
+    ctx->bits[1] += len >> 29;
+
+    t = (t >> 3) & 0x3f;	/* Bytes already in shsInfo->data */
+
+    /* Handle any leading odd-sized chunks */
+
+    if (t) {
+	unsigned char *p = (unsigned char *) ctx->in + t;
+
+	t = 64 - t;
+	if (len < t) {
+	    memcpy(p, buf, len);
+	    return;
+	}
+	memcpy(p, buf, t);
+	byteReverse(ctx->in, 16);
+	ul_MD5Transform(ctx->buf, (uint32_t *) ctx->in);
+	buf += t;
+	len -= t;
+    }
+    /* Process data in 64-byte chunks */
+
+    while (len >= 64) {
+	memcpy(ctx->in, buf, 64);
+	byteReverse(ctx->in, 16);
+	ul_MD5Transform(ctx->buf, (uint32_t *) ctx->in);
+	buf += 64;
+	len -= 64;
+    }
+
+    /* Handle any remaining bytes of data. */
+
+    memcpy(ctx->in, buf, len);
+}
+
+/*
+ * Final wrapup - pad to 64-byte boundary with the bit pattern
+ * 1 0* (64-bit count of bits processed, MSB-first)
+ */
+void ul_MD5Final(unsigned char digest[UL_MD5LENGTH], struct UL_MD5Context *ctx)
+{
+    unsigned count;
+    unsigned char *p;
+
+    /* Compute number of bytes mod 64 */
+    count = (ctx->bits[0] >> 3) & 0x3F;
+
+    /* Set the first char of padding to 0x80.  This is safe since there is
+       always at least one byte free */
+    p = ctx->in + count;
+    *p++ = 0x80;
+
+    /* Bytes of padding needed to make 64 bytes */
+    count = 64 - 1 - count;
+
+    /* Pad out to 56 mod 64 */
+    if (count < 8) {
+	/* Two lots of padding:  Pad the first block to 64 bytes */
+	memset(p, 0, count);
+	byteReverse(ctx->in, 16);
+	ul_MD5Transform(ctx->buf, (uint32_t *) ctx->in);
+
+	/* Now fill the next block with 56 bytes */
+	memset(ctx->in, 0, 56);
+    } else {
+	/* Pad block to 56 bytes */
+	memset(p, 0, count - 8);
+    }
+    byteReverse(ctx->in, 14);
+
+    /* Append length in bits and transform.
+     * Use memcpy to avoid aliasing problems.  On most systems,
+     * this will be optimized away to the same code.
+     */
+    memcpy(&ctx->in[14 * sizeof(uint32_t)], &ctx->bits[0], 4);
+    memcpy(&ctx->in[15 * sizeof(uint32_t)], &ctx->bits[1], 4);
+
+    ul_MD5Transform(ctx->buf, (uint32_t *) ctx->in);
+    byteReverse((unsigned char *) ctx->buf, 4);
+    memcpy(digest, ctx->buf, UL_MD5LENGTH);
+    memset(ctx, 0, sizeof(*ctx));	/* In case it's sensitive */
+}
+
+#ifndef ASM_MD5
+
+/* The four core functions - F1 is optimized somewhat */
+
+/* #define F1(x, y, z) (x & y | ~x & z) */
+#define F1(x, y, z) (z ^ (x & (y ^ z)))
+#define F2(x, y, z) F1(z, x, y)
+#define F3(x, y, z) (x ^ y ^ z)
+#define F4(x, y, z) (y ^ (x | ~z))
+
+/* This is the central step in the MD5 algorithm. */
+#define MD5STEP(f, w, x, y, z, data, s) \
+	( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )
+
+/*
+ * The core of the MD5 algorithm, this alters an existing MD5 hash to
+ * reflect the addition of 16 longwords of new data.  MD5Update blocks
+ * the data and converts bytes into longwords for this routine.
+ */
+void ul_MD5Transform(uint32_t buf[4], uint32_t const in[16])
+{
+    register uint32_t a, b, c, d;
+
+    a = buf[0];
+    b = buf[1];
+    c = buf[2];
+    d = buf[3];
+
+    MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
+    MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
+    MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
+    MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
+    MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
+    MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
+    MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
+    MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
+    MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
+    MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
+    MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
+    MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
+    MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
+    MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
+    MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
+    MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
+
+    MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
+    MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
+    MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
+    MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
+    MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
+    MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
+    MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
+    MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
+    MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
+    MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
+    MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
+    MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
+    MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
+    MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
+    MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
+    MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
+
+    MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
+    MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
+    MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
+    MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
+    MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
+    MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
+    MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
+    MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
+    MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
+    MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
+    MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
+    MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
+    MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
+    MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
+    MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
+    MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
+
+    MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
+    MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
+    MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
+    MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
+    MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
+    MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
+    MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
+    MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
+    MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
+    MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
+    MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
+    MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
+    MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
+    MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
+    MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
+    MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
+
+    buf[0] += a;
+    buf[1] += b;
+    buf[2] += c;
+    buf[3] += d;
+}
+
+#endif
+
diff --git a/lib/meson.build b/lib/meson.build
new file mode 100644
index 0000000..58d5da4
--- /dev/null
+++ b/lib/meson.build
@@ -0,0 +1,108 @@
+lib_common_sources = '''
+	blkdev.c
+	buffer.c
+	canonicalize.c
+	color-names.c
+	crc32.c
+	crc32c.c
+        crc64.c
+	c_strtod.c
+	encode.c
+	env.c
+	fileutils.c
+	idcache.c
+	jsonwrt.c
+	mangle.c
+	match.c
+	mbsalign.c
+	mbsedit.c
+	md5.c
+	procfs.c
+	pwdutils.c
+	randutils.c
+	sha1.c
+	sha256.c
+	signames.c
+	strutils.c
+	strv.c
+	timeutils.c
+	ttyutils.c
+	xxhash.c
+'''.split()
+
+idcache_c = files('idcache.c')
+randutils_c = files('randutils.c')
+md5_c = files('md5.c')
+sha1_c = files('sha1.c')
+strutils_c = files('strutils.c')
+strv_c = files('strv.c')
+pager_c = files('pager.c')
+
+lib_common_sources += [idcache_c,
+                       randutils_c,
+                       md5_c,
+                       sha1_c,
+                       strutils_c,
+                       strv_c]
+
+monotonic_c = files('monotonic.c')
+timer_c = files('timer.c')
+swapprober_c = files('swapprober.c')
+pty_session_c = files('pty-session.c')
+ismounted_c = files('ismounted.c')
+exec_shell_c = files('exec_shell.c')
+fileeq_c = files('fileeq.c')
+logindefs_c = static_library('logindefs',
+  sources : ['logindefs.c'],
+  include_directories : dir_include,
+  dependencies : lib_econf,
+)
+selinux_utils_c = files('selinux-utils.c')
+
+if LINUX
+  lib_common_sources += '''
+    caputils.c
+    linux_version.c
+    loopdev.c
+'''.split()
+endif
+
+if build_plymouth_support
+  lib_common_sources += '''
+        plymouth-ctrl.c
+'''.split()
+endif
+
+if conf.get('HAVE_LANGINFO_H') not in [1]
+  lib_common_sources += 'langinfo.c'
+endif
+
+if conf.get('HAVE_CPU_SET_T') in [1]
+  lib_common_sources += 'cpuset.c'
+endif
+
+if conf.get('HAVE_OPENAT') in [1] and conf.get('HAVE_DIRFD') in [1]
+  lib_common_sources += '''
+    path.c
+    procfs.c
+    sysfs.c
+'''.split()
+endif
+
+lib_common = static_library(
+  'common',
+  lib_common_sources,
+  include_directories : dir_include)
+
+
+lib_color_sources = files('''
+  colors.c
+  color-names.c
+'''.split())
+# colors.h include/color-names.h
+
+lib_tcolors = static_library(
+  'tcolors',
+  lib_color_sources,
+  include_directories : dir_include,
+  dependencies : curses_libs)
diff --git a/lib/monotonic.c b/lib/monotonic.c
new file mode 100644
index 0000000..cd554dd
--- /dev/null
+++ b/lib/monotonic.c
@@ -0,0 +1,81 @@
+/*
+ * Please, don't add this file to libcommon because clock_gettime() requires
+ * -lrt on systems with old libc.
+ *
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ */
+#include <time.h>
+#include <signal.h>
+#ifdef HAVE_SYSINFO
+#include <sys/sysinfo.h>
+#endif
+#include <sys/time.h>
+
+#include "c.h"
+#include "monotonic.h"
+
+int get_boot_time(struct timeval *boot_time)
+{
+#ifdef CLOCK_BOOTTIME
+	struct timespec hires_uptime;
+	struct timeval lores_uptime;
+#endif
+	struct timeval now;
+#ifdef HAVE_SYSINFO
+	struct sysinfo info;
+#endif
+
+	if (gettimeofday(&now, NULL) != 0)
+		return -errno;
+#ifdef CLOCK_BOOTTIME
+	if (clock_gettime(CLOCK_BOOTTIME, &hires_uptime) == 0) {
+		TIMESPEC_TO_TIMEVAL(&lores_uptime, &hires_uptime);
+		timersub(&now, &lores_uptime, boot_time);
+		return 0;
+	}
+#endif
+#ifdef HAVE_SYSINFO
+	/* fallback */
+	if (sysinfo(&info) != 0)
+		return -errno;
+
+	boot_time->tv_sec = now.tv_sec - info.uptime;
+	boot_time->tv_usec = 0;
+	return 0;
+#else
+	return -ENOSYS;
+#endif
+}
+
+usec_t get_suspended_time(void)
+{
+#if defined(CLOCK_BOOTTIME) && defined(CLOCK_MONOTONIC)
+	struct timespec boot, mono;
+
+	if (clock_gettime(CLOCK_BOOTTIME, &boot) == 0 &&
+	    clock_gettime(CLOCK_MONOTONIC, &mono) == 0)
+		return timespec_to_usec(&boot) - timespec_to_usec(&mono);
+#endif
+	return 0;
+}
+
+int gettime_monotonic(struct timeval *tv)
+{
+#ifdef CLOCK_MONOTONIC
+	/* Can slew only by ntp and adjtime */
+	int ret;
+	struct timespec ts;
+
+	/* Linux specific, can't slew */
+	if (!(ret = clock_gettime(UL_CLOCK_MONOTONIC, &ts))) {
+		tv->tv_sec = ts.tv_sec;
+		tv->tv_usec = ts.tv_nsec / 1000;
+	}
+	return ret;
+#else
+	return gettimeofday(tv, NULL);
+#endif
+}
+
+
diff --git a/lib/pager.c b/lib/pager.c
new file mode 100644
index 0000000..9429032
--- /dev/null
+++ b/lib/pager.c
@@ -0,0 +1,323 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * This file may be redistributed under the terms of the GNU Public
+ * License.
+ *
+ * Based on linux-perf/git scm
+ *
+ * Some modifications and simplifications for util-linux
+ * by Davidlohr Bueso <dave@xxxxxxx> - March 2012.
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <err.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <signal.h>
+
+#include "c.h"
+#include "xalloc.h"
+#include "nls.h"
+#include "ttyutils.h"
+#include "pager.h"
+
+#define NULL_DEVICE	"/dev/null"
+
+static const char *pager_argv[] = { "sh", "-c", NULL, NULL };
+
+struct child_process {
+	const char **argv;
+	pid_t pid;
+	int in;
+	int out;
+	int err;
+
+	int org_err;
+	int org_out;
+	struct sigaction orig_sigint;
+	struct sigaction orig_sighup;
+	struct sigaction orig_sigterm;
+	struct sigaction orig_sigquit;
+	struct sigaction orig_sigpipe;
+
+	unsigned no_stdin:1;
+	void (*preexec_cb)(void);
+};
+static struct child_process pager_process;
+
+static inline void close_pair(int fd[2])
+{
+	close(fd[0]);
+	close(fd[1]);
+}
+
+static int start_command(struct child_process *cmd)
+{
+	int need_in;
+	int fdin[2];
+
+	/*
+	 * In case of errors we must keep the promise to close FDs
+	 * that have been passed in via ->in and ->out.
+	 */
+	need_in = !cmd->no_stdin && cmd->in < 0;
+	if (need_in) {
+		if (pipe(fdin) < 0) {
+			if (cmd->out > 0)
+				close(cmd->out);
+			return -1;
+		}
+		cmd->in = fdin[1];
+	}
+
+	fflush(NULL);
+	cmd->pid = fork();
+	if (!cmd->pid) {
+		if (need_in) {
+			dup2(fdin[0], STDIN_FILENO);
+			close_pair(fdin);
+		} else if (cmd->in > 0) {
+			dup2(cmd->in, STDIN_FILENO);
+			close(cmd->in);
+		}
+
+		cmd->preexec_cb();
+		execvp(cmd->argv[0], (char *const*) cmd->argv);
+		errexec(cmd->argv[0]);
+	}
+
+	if (cmd->pid < 0) {
+		if (need_in)
+			close_pair(fdin);
+		else if (0 <= cmd->in)
+			close(cmd->in);
+		return -1;
+	}
+
+	if (need_in)
+		close(fdin[0]);
+	else if (0 <= cmd->in)
+		close(cmd->in);
+	return 0;
+}
+
+static int wait_or_whine(pid_t pid)
+{
+	for (;;) {
+		int status, code;
+		pid_t waiting = waitpid(pid, &status, 0);
+
+		if (waiting < 0) {
+			if (errno == EINTR)
+				continue;
+			ul_sig_err(EXIT_FAILURE, "waitpid failed");
+		}
+		if (waiting != pid)
+			return -1;
+		if (WIFSIGNALED(status))
+			return -1;
+
+		if (!WIFEXITED(status))
+			return -1;
+		code = WEXITSTATUS(status);
+		switch (code) {
+		case 127:
+			return -1;
+		case 0:
+			return 0;
+		default:
+			return -1;
+		}
+	}
+}
+
+static int finish_command(struct child_process *cmd)
+{
+	return wait_or_whine(cmd->pid);
+}
+
+static void pager_preexec(void)
+{
+	/*
+	 * Work around bug in "less" by not starting it until we
+	 * have real input
+	 */
+	fd_set in, ex;
+
+	FD_ZERO(&in);
+	FD_SET(STDIN_FILENO, &in);
+	ex = in;
+
+	select(STDIN_FILENO + 1, &in, NULL, &ex, NULL);
+
+	if (setenv("LESS", "FRSX", 0) != 0)
+		warn(_("failed to set the %s environment variable"), "LESS");
+}
+
+static void wait_for_pager(void)
+{
+	if (pager_process.pid == 0)
+		return;
+
+	/* signal EOF to pager */
+	close(STDOUT_FILENO);
+	close(STDERR_FILENO);
+	finish_command(&pager_process);
+}
+
+static void wait_for_pager_signal(int signo)
+{
+	wait_for_pager();
+	raise(signo);
+}
+
+static int has_command(const char *cmd)
+{
+	const char *path;
+	char *p, *s;
+	int rc = 0;
+
+	if (!cmd)
+		goto done;
+	if (*cmd == '/') {
+		rc = access(cmd, X_OK) == 0;
+		goto done;
+	}
+
+	path = getenv("PATH");
+	if (!path)
+		goto done;
+	p = xstrdup(path);
+	if (!p)
+		goto done;
+
+	for(s = strtok(p, ":"); s; s = strtok(NULL, ":")) {
+		int fd = open(s, O_RDONLY|O_CLOEXEC);
+		if (fd < 0)
+			continue;
+		rc = faccessat(fd, cmd, X_OK, 0) == 0;
+		close(fd);
+		if (rc)
+			break;
+	}
+	free(p);
+done:
+	/*fprintf(stderr, "has PAGER %s rc=%d\n", cmd, rc);*/
+	return rc;
+}
+
+static void __setup_pager(void)
+{
+	const char *pager = getenv("PAGER");
+	struct sigaction sa;
+
+	if (!isatty(STDOUT_FILENO))
+		return;
+
+	if (!pager)
+		pager = "less";
+	else if (!*pager || !strcmp(pager, "cat"))
+		return;
+
+	if (!has_command(pager))
+		return;
+
+	/* spawn the pager */
+	pager_argv[2] = pager;
+	pager_process.argv = pager_argv;
+	pager_process.in = -1;
+	pager_process.preexec_cb = pager_preexec;
+
+	if (start_command(&pager_process))
+		return;
+
+	/* original process continues, but writes to the pipe */
+	dup2(pager_process.in, STDOUT_FILENO);
+	setvbuf(stdout, NULL, _IOLBF, 0);
+	if (isatty(STDERR_FILENO)) {
+		dup2(pager_process.in, STDERR_FILENO);
+		setvbuf(stderr, NULL, _IOLBF, 0);
+	}
+	close(pager_process.in);
+
+	memset(&sa, 0, sizeof(sa));
+	sa.sa_handler = wait_for_pager_signal;
+
+	/* this makes sure that the parent terminates after the pager */
+	sigaction(SIGINT,  &sa, &pager_process.orig_sigint);
+	sigaction(SIGHUP,  &sa, &pager_process.orig_sighup);
+	sigaction(SIGTERM, &sa, &pager_process.orig_sigterm);
+	sigaction(SIGQUIT, &sa, &pager_process.orig_sigquit);
+	sigaction(SIGPIPE, &sa, &pager_process.orig_sigpipe);
+}
+
+/* Setup pager and redirects output to the $PAGER. The pager is closed at exit.
+ */
+void pager_redirect(void)
+{
+	if (pager_process.pid)
+		return;		/* already running */
+
+	__setup_pager();
+
+	atexit(wait_for_pager);
+}
+
+/* Setup pager and redirect output, the pager may be closed by pager_close().
+ */
+void pager_open(void)
+{
+	if (pager_process.pid)
+		return;		/* already running */
+
+	pager_process.org_out = dup(STDOUT_FILENO);
+	pager_process.org_err = dup(STDERR_FILENO);
+
+	__setup_pager();
+}
+
+/* Close pager and restore original std{out,err}.
+ */
+void pager_close(void)
+{
+	if (pager_process.pid == 0)
+		return;
+
+	wait_for_pager();
+
+	/* restore original output */
+	dup2(pager_process.org_out, STDOUT_FILENO);
+	dup2(pager_process.org_err, STDERR_FILENO);
+
+	close(pager_process.org_out);
+	close(pager_process.org_err);
+
+	/* restore original segnals setting */
+	sigaction(SIGINT,  &pager_process.orig_sigint, NULL);
+	sigaction(SIGHUP,  &pager_process.orig_sighup, NULL);
+	sigaction(SIGTERM, &pager_process.orig_sigterm, NULL);
+	sigaction(SIGQUIT, &pager_process.orig_sigquit, NULL);
+	sigaction(SIGPIPE, &pager_process.orig_sigpipe, NULL);
+
+	memset(&pager_process, 0, sizeof(pager_process));
+}
+
+#ifdef TEST_PROGRAM_PAGER
+
+#define MAX 255
+
+int main(int argc __attribute__ ((__unused__)),
+	 char *argv[] __attribute__ ((__unused__)))
+{
+	int i;
+
+	pager_redirect();
+	for (i = 0; i < MAX; i++)
+		printf("%d\n", i);
+	return EXIT_SUCCESS;
+}
+#endif /* TEST_PROGRAM_PAGER */
diff --git a/lib/path.c b/lib/path.c
new file mode 100644
index 0000000..4aceda1
--- /dev/null
+++ b/lib/path.c
@@ -0,0 +1,1295 @@
+/*
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Copyright (C) 2018 Karel Zak <kzak@redhat.com>
+ *
+ *
+ * Simple functions to access files. Paths can be globally prefixed to read
+ * data from an alternative source (e.g. a /proc dump for regression tests).
+ *
+ * The paths is possible to format by printf-like way for functions with "f"
+ * postfix in the name (e.g. readf, openf, ... ul_path_readf_u64()).
+ *
+ * The ul_path_read_* API is possible to use without path_cxt handler. In this
+ * case is not possible to use global prefix and printf-like formatting.
+ */
+#include <stdarg.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <inttypes.h>
+#include <errno.h>
+
+#include "c.h"
+#include "fileutils.h"
+#include "all-io.h"
+#include "path.h"
+#include "debug.h"
+#include "strutils.h"
+
+/*
+ * Debug stuff (based on include/debug.h)
+ */
+static UL_DEBUG_DEFINE_MASK(ulpath);
+UL_DEBUG_DEFINE_MASKNAMES(ulpath) = UL_DEBUG_EMPTY_MASKNAMES;
+
+#define ULPATH_DEBUG_INIT	(1 << 1)
+#define ULPATH_DEBUG_CXT	(1 << 2)
+
+#define DBG(m, x)       __UL_DBG(ulpath, ULPATH_DEBUG_, m, x)
+#define ON_DBG(m, x)    __UL_DBG_CALL(ulpath, ULPATH_DEBUG_, m, x)
+
+#define UL_DEBUG_CURRENT_MASK	UL_DEBUG_MASK(ulpath)
+#include "debugobj.h"
+
+void ul_path_init_debug(void)
+{
+	if (ulpath_debug_mask)
+		return;
+	__UL_INIT_DEBUG_FROM_ENV(ulpath, ULPATH_DEBUG_, 0, ULPATH_DEBUG);
+}
+
+struct path_cxt *ul_new_path(const char *dir, ...)
+{
+	struct path_cxt *pc = calloc(1, sizeof(*pc));
+
+	if (!pc)
+		return NULL;
+
+	DBG(CXT, ul_debugobj(pc, "alloc"));
+
+	pc->refcount = 1;
+	pc->dir_fd = -1;
+
+	if (dir) {
+		int rc;
+		va_list ap;
+
+		va_start(ap, dir);
+		rc = vasprintf(&pc->dir_path, dir, ap);
+		va_end(ap);
+
+		if (rc < 0 || !pc->dir_path)
+			goto fail;
+	}
+	return pc;
+fail:
+	ul_unref_path(pc);
+	return NULL;
+}
+
+void ul_ref_path(struct path_cxt *pc)
+{
+	if (pc)
+		pc->refcount++;
+}
+
+void ul_unref_path(struct path_cxt *pc)
+{
+	if (!pc)
+		return;
+
+	pc->refcount--;
+
+	if (pc->refcount <= 0) {
+		DBG(CXT, ul_debugobj(pc, "dealloc"));
+		if (pc->dialect)
+			pc->free_dialect(pc);
+		ul_path_close_dirfd(pc);
+		free(pc->dir_path);
+		free(pc->prefix);
+		free(pc);
+	}
+}
+
+int ul_path_set_prefix(struct path_cxt *pc, const char *prefix)
+{
+	char *p = NULL;
+
+	assert(pc->dir_fd < 0);
+
+	if (prefix) {
+		p = strdup(prefix);
+		if (!p)
+			return -ENOMEM;
+	}
+
+	free(pc->prefix);
+	pc->prefix = p;
+	DBG(CXT, ul_debugobj(pc, "new prefix: '%s'", p));
+	return 0;
+}
+
+const char *ul_path_get_prefix(struct path_cxt *pc)
+{
+	return pc ? pc->prefix : NULL;
+}
+
+int ul_path_set_dir(struct path_cxt *pc, const char *dir)
+{
+	char *p = NULL;
+
+	if (dir) {
+		p = strdup(dir);
+		if (!p)
+			return -ENOMEM;
+	}
+
+	if (pc->dir_fd >= 0) {
+		close(pc->dir_fd);
+		pc->dir_fd = -1;
+	}
+
+	free(pc->dir_path);
+	pc->dir_path = p;
+	DBG(CXT, ul_debugobj(pc, "new dir: '%s'", p));
+	return 0;
+}
+
+const char *ul_path_get_dir(struct path_cxt *pc)
+{
+	return pc ? pc->dir_path : NULL;
+}
+
+int ul_path_set_dialect(struct path_cxt *pc, void *data, void free_data(struct path_cxt *))
+{
+	pc->dialect = data;
+	pc->free_dialect = free_data;
+	DBG(CXT, ul_debugobj(pc, "(re)set dialect"));
+	return 0;
+}
+
+void *ul_path_get_dialect(struct path_cxt *pc)
+{
+	return pc ? pc->dialect : NULL;
+}
+
+int ul_path_set_enoent_redirect(struct path_cxt *pc, int (*func)(struct path_cxt *, const char *, int *))
+{
+	pc->redirect_on_enoent = func;
+	return 0;
+}
+
+static const char *get_absdir(struct path_cxt *pc)
+{
+	int rc;
+	const char *dirpath;
+
+	if (!pc->prefix)
+		return pc->dir_path;
+
+	dirpath = pc->dir_path;
+	if (!dirpath)
+		return pc->prefix;
+	if (*dirpath == '/')
+		dirpath++;
+
+	rc = snprintf(pc->path_buffer, sizeof(pc->path_buffer), "%s/%s", pc->prefix, dirpath);
+	if (rc < 0)
+		return NULL;
+	if ((size_t)rc >= sizeof(pc->path_buffer)) {
+		errno = ENAMETOOLONG;
+		return NULL;
+	}
+
+	return pc->path_buffer;
+}
+
+int ul_path_is_accessible(struct path_cxt *pc)
+{
+	const char *path;
+	assert(pc);
+
+	if (pc->dir_fd >= 0)
+		return 1;
+
+	path = get_absdir(pc);
+	if (!path)
+		return 0;
+	return access(path, F_OK) == 0;
+}
+
+int ul_path_get_dirfd(struct path_cxt *pc)
+{
+	assert(pc);
+	assert(pc->dir_path);
+
+	if (pc->dir_fd < 0) {
+		const char *path = get_absdir(pc);
+		if (!path)
+			return -errno;
+
+		DBG(CXT, ul_debugobj(pc, "opening dir: '%s'", path));
+		pc->dir_fd = open(path, O_RDONLY|O_CLOEXEC);
+	}
+
+	return pc->dir_fd;
+}
+
+/* Note that next ul_path_get_dirfd() will reopen the directory */
+void ul_path_close_dirfd(struct path_cxt *pc)
+{
+	assert(pc);
+
+	if (pc->dir_fd >= 0) {
+		DBG(CXT, ul_debugobj(pc, "closing dir"));
+		close(pc->dir_fd);
+		pc->dir_fd = -1;
+	}
+}
+
+int ul_path_isopen_dirfd(struct path_cxt *pc)
+{
+	return pc && pc->dir_fd >= 0;
+}
+
+static const char *ul_path_mkpath(struct path_cxt *pc, const char *path, va_list ap)
+{
+	int rc;
+
+	errno = 0;
+
+	rc = vsnprintf(pc->path_buffer, sizeof(pc->path_buffer), path, ap);
+	if (rc < 0) {
+		if (!errno)
+			errno = EINVAL;
+		return NULL;
+	}
+
+	if ((size_t)rc >= sizeof(pc->path_buffer)) {
+		errno = ENAMETOOLONG;
+		return NULL;
+	}
+
+	return pc->path_buffer;
+}
+
+char *ul_path_get_abspath(struct path_cxt *pc, char *buf, size_t bufsz, const char *path, ...)
+{
+	if (path) {
+		int rc;
+		va_list ap;
+		const char *tail = NULL, *dirpath = pc->dir_path;
+
+		va_start(ap, path);
+		tail = ul_path_mkpath(pc, path, ap);
+		va_end(ap);
+
+		if (dirpath && *dirpath == '/')
+			dirpath++;
+		if (tail && *tail == '/')
+			tail++;
+
+		rc = snprintf(buf, bufsz, "%s/%s/%s",
+				pc->prefix ? pc->prefix : "",
+				dirpath ? dirpath : "",
+				tail ? tail : "");
+
+		if ((size_t)rc >= bufsz) {
+			errno = ENAMETOOLONG;
+			return NULL;
+		}
+	} else {
+		const char *tmp = get_absdir(pc);
+
+		if (!tmp)
+			return NULL;
+		xstrncpy(buf, tmp, bufsz);
+	}
+
+	return buf;
+}
+
+
+int ul_path_access(struct path_cxt *pc, int mode, const char *path)
+{
+	int rc;
+
+	if (!pc) {
+		rc = access(path, mode);
+		DBG(CXT, ul_debug("access '%s' [no context, rc=%d]", path, rc));
+	} else {
+		int dir = ul_path_get_dirfd(pc);
+		if (dir < 0)
+			return dir;
+		if (*path == '/')
+			path++;
+
+		rc = faccessat(dir, path, mode, 0);
+
+		if (rc && errno == ENOENT
+		    && pc->redirect_on_enoent
+		    && pc->redirect_on_enoent(pc, path, &dir) == 0)
+			rc = faccessat(dir, path, mode, 0);
+
+		DBG(CXT, ul_debugobj(pc, "access: '%s' [rc=%d]", path, rc));
+	}
+	return rc;
+}
+
+int ul_path_accessf(struct path_cxt *pc, int mode, const char *path, ...)
+{
+	va_list ap;
+	const char *p;
+
+	va_start(ap, path);
+	p = ul_path_mkpath(pc, path, ap);
+	va_end(ap);
+
+	return !p ? -errno : ul_path_access(pc, mode, p);
+}
+
+int ul_path_stat(struct path_cxt *pc, struct stat *sb, int flags, const char *path)
+{
+	int rc;
+
+	if (!pc) {
+		rc = path ? stat(path, sb) : -EINVAL;
+		DBG(CXT, ul_debug("stat '%s' [no context, rc=%d]", path, rc));
+	} else {
+		int dir = ul_path_get_dirfd(pc);
+		if (dir < 0)
+			return dir;
+		if (path) {
+			if  (*path == '/')
+				path++;
+			rc = fstatat(dir, path, sb, flags);
+
+		} else
+			rc = fstat(dir, sb);	/* dir itself */
+
+		if (rc && errno == ENOENT
+		    && path
+		    && pc->redirect_on_enoent
+		    && pc->redirect_on_enoent(pc, path, &dir) == 0)
+			rc = fstatat(dir, path, sb, 0);
+
+		DBG(CXT, ul_debugobj(pc, "stat '%s' [rc=%d]", path, rc));
+	}
+	return rc;
+}
+
+int ul_path_open(struct path_cxt *pc, int flags, const char *path)
+{
+	int fd;
+
+	if (!path)
+		return -EINVAL;
+	if (!pc) {
+		fd = open(path, flags);
+		DBG(CXT, ul_debug("opening '%s' [no context]", path));
+	} else {
+		int fdx;
+		int dir = ul_path_get_dirfd(pc);
+		if (dir < 0)
+			return dir;
+
+		if (*path == '/')
+			path++;
+
+		fdx = fd = openat(dir, path, flags);
+
+		if (fd < 0 && errno == ENOENT
+		    && pc->redirect_on_enoent
+		    && pc->redirect_on_enoent(pc, path, &dir) == 0)
+			fd = openat(dir, path, flags);
+
+		DBG(CXT, ul_debugobj(pc, "opening '%s'%s", path, fdx != fd ? " [redirected]" : ""));
+	}
+	return fd;
+}
+
+int ul_path_vopenf(struct path_cxt *pc, int flags, const char *path, va_list ap)
+{
+	const char *p = ul_path_mkpath(pc, path, ap);
+
+	return !p ? -errno : ul_path_open(pc, flags, p);
+}
+
+int ul_path_openf(struct path_cxt *pc, int flags, const char *path, ...)
+{
+	va_list ap;
+	int rc;
+
+	va_start(ap, path);
+	rc = ul_path_vopenf(pc, flags, path, ap);
+	va_end(ap);
+
+	return rc;
+}
+
+/*
+ * Maybe stupid, but good enough ;-)
+ */
+static int mode2flags(const char *mode)
+{
+	int flags = 0;
+	const char *p;
+
+	for (p = mode; p && *p; p++) {
+		if (*p == 'r' && *(p + 1) == '+')
+			flags |= O_RDWR;
+		else if (*p == 'r')
+			flags |= O_RDONLY;
+
+		else if (*p == 'w' && *(p + 1) == '+')
+			flags |= O_RDWR | O_TRUNC;
+		else if (*p == 'w')
+			flags |= O_WRONLY | O_TRUNC;
+
+		else if (*p == 'a' && *(p + 1) == '+')
+			flags |= O_RDWR | O_APPEND;
+		else if (*p == 'a')
+			flags |= O_WRONLY | O_APPEND;
+#ifdef O_CLOEXEC
+		else if (*p == *UL_CLOEXECSTR)
+			flags |= O_CLOEXEC;
+#endif
+	}
+
+	return flags;
+}
+
+FILE *ul_path_fopen(struct path_cxt *pc, const char *mode, const char *path)
+{
+	int flags = mode2flags(mode);
+	int fd = ul_path_open(pc, flags, path);
+
+	if (fd < 0)
+		return NULL;
+
+	return fdopen(fd, mode);
+}
+
+
+FILE *ul_path_vfopenf(struct path_cxt *pc, const char *mode, const char *path, va_list ap)
+{
+	const char *p = ul_path_mkpath(pc, path, ap);
+
+	return !p ? NULL : ul_path_fopen(pc, mode, p);
+}
+
+FILE *ul_path_fopenf(struct path_cxt *pc, const char *mode, const char *path, ...)
+{
+	FILE *f;
+	va_list ap;
+
+	va_start(ap, path);
+	f = ul_path_vfopenf(pc, mode, path, ap);
+	va_end(ap);
+
+	return f;
+}
+
+/*
+ * Open directory @path in read-only mode. If the path is NULL then duplicate FD
+ * to the directory addressed by @pc.
+ */
+DIR *ul_path_opendir(struct path_cxt *pc, const char *path)
+{
+	DIR *dir;
+	int fd = -1;
+
+	if (path)
+		fd = ul_path_open(pc, O_RDONLY|O_CLOEXEC, path);
+	else if (pc->dir_path) {
+		int dirfd;
+
+		DBG(CXT, ul_debugobj(pc, "duplicate dir path"));
+		dirfd = ul_path_get_dirfd(pc);
+		if (dirfd >= 0)
+			fd = dup_fd_cloexec(dirfd, STDERR_FILENO + 1);
+	}
+
+	if (fd < 0)
+		return NULL;
+
+	dir = fdopendir(fd);
+	if (!dir) {
+		close(fd);
+		return NULL;
+	}
+	if (!path)
+		 rewinddir(dir);
+	return dir;
+}
+
+
+/*
+ * Open directory @path in read-only mode. If the path is NULL then duplicate FD
+ * to the directory addressed by @pc.
+ */
+DIR *ul_path_vopendirf(struct path_cxt *pc, const char *path, va_list ap)
+{
+	const char *p = ul_path_mkpath(pc, path, ap);
+
+	return !p ? NULL : ul_path_opendir(pc, p);
+}
+
+/*
+ * Open directory @path in read-only mode. If the path is NULL then duplicate FD
+ * to the directory addressed by @pc.
+ */
+DIR *ul_path_opendirf(struct path_cxt *pc, const char *path, ...)
+{
+	va_list ap;
+	DIR *dir;
+
+	va_start(ap, path);
+	dir = ul_path_vopendirf(pc, path, ap);
+	va_end(ap);
+
+	return dir;
+}
+
+/*
+ * If @path is NULL then readlink is called on @pc directory.
+ */
+ssize_t ul_path_readlink(struct path_cxt *pc, char *buf, size_t bufsiz, const char *path)
+{
+	int dirfd;
+	ssize_t ssz;
+
+	if (!path) {
+		const char *p = get_absdir(pc);
+		if (!p)
+			return -errno;
+		ssz = readlink(p, buf, bufsiz - 1);
+	} else {
+		dirfd = ul_path_get_dirfd(pc);
+		if (dirfd < 0)
+			return dirfd;
+
+		if (*path == '/')
+			path++;
+
+		ssz = readlinkat(dirfd, path, buf, bufsiz - 1);
+	}
+
+	if (ssz >= 0)
+		buf[ssz] = '\0';
+	return ssz;
+}
+
+/*
+ * If @path is NULL then readlink is called on @pc directory.
+ */
+ssize_t ul_path_readlinkf(struct path_cxt *pc, char *buf, size_t bufsiz, const char *path, ...)
+{
+	const char *p;
+	va_list ap;
+
+	va_start(ap, path);
+	p = ul_path_mkpath(pc, path, ap);
+	va_end(ap);
+
+	return !p ? -errno : ul_path_readlink(pc, buf, bufsiz, p);
+}
+
+int ul_path_read(struct path_cxt *pc, char *buf, size_t len, const char *path)
+{
+	int rc, errsv;
+	int fd;
+
+	fd = ul_path_open(pc, O_RDONLY|O_CLOEXEC, path);
+	if (fd < 0)
+		return -errno;
+
+	DBG(CXT, ul_debug(" reading '%s'", path));
+	rc = read_all(fd, buf, len);
+
+	errsv = errno;
+	close(fd);
+	errno = errsv;
+	return rc;
+}
+
+int ul_path_vreadf(struct path_cxt *pc, char *buf, size_t len, const char *path, va_list ap)
+{
+	const char *p = ul_path_mkpath(pc, path, ap);
+
+	return !p ? -errno : ul_path_read(pc, buf, len, p);
+}
+
+int ul_path_readf(struct path_cxt *pc, char *buf, size_t len, const char *path, ...)
+{
+	va_list ap;
+	int rc;
+
+	va_start(ap, path);
+	rc = ul_path_vreadf(pc, buf, len, path, ap);
+	va_end(ap);
+
+	return rc;
+}
+
+
+/*
+ * Returns newly allocated buffer with data from file. Maximal size is BUFSIZ
+ * (send patch if you need something bigger;-)
+ *
+ * Returns size of the string without \0, nothing is allocated if returns <= 0.
+ */
+int ul_path_read_string(struct path_cxt *pc, char **str, const char *path)
+{
+	char buf[BUFSIZ];
+	int rc;
+
+	if (!str)
+		return -EINVAL;
+
+	*str = NULL;
+	rc = ul_path_read(pc, buf, sizeof(buf) - 1, path);
+	if (rc < 0)
+		return rc;
+
+	/* Remove trailing newline (usual in sysfs) */
+	if (rc > 0 && *(buf + rc - 1) == '\n')
+		--rc;
+	if (rc == 0)
+		return 0;
+
+	buf[rc] = '\0';
+	*str = strdup(buf);
+	if (!*str)
+		rc = -ENOMEM;
+
+	return rc;
+}
+
+int ul_path_readf_string(struct path_cxt *pc, char **str, const char *path, ...)
+{
+	const char *p;
+	va_list ap;
+
+	va_start(ap, path);
+	p = ul_path_mkpath(pc, path, ap);
+	va_end(ap);
+
+	return !p ? -errno : ul_path_read_string(pc, str, p);
+}
+
+int ul_path_read_buffer(struct path_cxt *pc, char *buf, size_t bufsz, const char *path)
+{
+	int rc = ul_path_read(pc, buf, bufsz - 1, path);
+
+	if (rc == 0)
+		buf[0] = '\0';
+
+	else if (rc > 0) {
+		/* Remove trailing newline (usual in sysfs) */
+		if (*(buf + rc - 1) == '\n')
+			buf[--rc] = '\0';
+		else
+			buf[rc - 1] = '\0';
+	}
+
+	return rc;
+}
+
+int ul_path_readf_buffer(struct path_cxt *pc, char *buf, size_t bufsz, const char *path, ...)
+{
+	const char *p;
+	va_list ap;
+
+	va_start(ap, path);
+	p = ul_path_mkpath(pc, path, ap);
+	va_end(ap);
+
+	return !p ? -errno : ul_path_read_buffer(pc, buf, bufsz, p);
+}
+
+int ul_path_scanf(struct path_cxt *pc, const char *path, const char *fmt, ...)
+{
+	FILE *f;
+	va_list fmt_ap;
+	int rc;
+
+	f = ul_path_fopen(pc, "r" UL_CLOEXECSTR, path);
+	if (!f)
+		return -EINVAL;
+
+	DBG(CXT, ul_debug(" fscanf [%s] '%s'", fmt, path));
+
+	va_start(fmt_ap, fmt);
+	rc = vfscanf(f, fmt, fmt_ap);
+	va_end(fmt_ap);
+
+	fclose(f);
+	return rc;
+}
+
+int ul_path_scanff(struct path_cxt *pc, const char *path, va_list ap, const char *fmt, ...)
+{
+	FILE *f;
+	va_list fmt_ap;
+	int rc;
+
+	f = ul_path_vfopenf(pc, "r" UL_CLOEXECSTR, path, ap);
+	if (!f)
+		return -EINVAL;
+
+	va_start(fmt_ap, fmt);
+	rc = vfscanf(f, fmt, fmt_ap);
+	va_end(fmt_ap);
+
+	fclose(f);
+	return rc;
+}
+
+
+int ul_path_read_s64(struct path_cxt *pc, int64_t *res, const char *path)
+{
+	int64_t x = 0;
+	int rc;
+
+	rc = ul_path_scanf(pc, path, "%"SCNd64, &x);
+	if (rc != 1)
+		return -1;
+	if (res)
+		*res = x;
+	return 0;
+}
+
+int ul_path_readf_s64(struct path_cxt *pc, int64_t *res, const char *path, ...)
+{
+	const char *p;
+	va_list ap;
+
+	va_start(ap, path);
+	p = ul_path_mkpath(pc, path, ap);
+	va_end(ap);
+
+	return !p ? -errno : ul_path_read_s64(pc, res, p);
+}
+
+int ul_path_read_u64(struct path_cxt *pc, uint64_t *res, const char *path)
+{
+	uint64_t x = 0;
+	int rc;
+
+	rc = ul_path_scanf(pc, path, "%"SCNu64, &x);
+	if (rc != 1)
+		return -1;
+	if (res)
+		*res = x;
+	return 0;
+}
+
+int ul_path_readf_u64(struct path_cxt *pc, uint64_t *res, const char *path, ...)
+{
+	const char *p;
+	va_list ap;
+
+	va_start(ap, path);
+	p = ul_path_mkpath(pc, path, ap);
+	va_end(ap);
+
+	return !p ? -errno : ul_path_read_u64(pc, res, p);
+}
+
+int ul_path_read_s32(struct path_cxt *pc, int *res, const char *path)
+{
+	int rc, x = 0;
+
+	rc = ul_path_scanf(pc, path, "%d", &x);
+	if (rc != 1)
+		return -1;
+	if (res)
+		*res = x;
+	return 0;
+}
+
+int ul_path_readf_s32(struct path_cxt *pc, int *res, const char *path, ...)
+{
+	const char *p;
+	va_list ap;
+
+	va_start(ap, path);
+	p = ul_path_mkpath(pc, path, ap);
+	va_end(ap);
+
+	return !p ? -errno : ul_path_read_s32(pc, res, p);
+}
+
+int ul_path_read_u32(struct path_cxt *pc, unsigned int *res, const char *path)
+{
+	int rc;
+	unsigned int x = 0;
+
+	rc = ul_path_scanf(pc, path, "%u", &x);
+	if (rc != 1)
+		return -1;
+	if (res)
+		*res = x;
+	return 0;
+}
+
+int ul_path_readf_u32(struct path_cxt *pc, unsigned int *res, const char *path, ...)
+{
+	const char *p;
+	va_list ap;
+
+	va_start(ap, path);
+	p = ul_path_mkpath(pc, path, ap);
+	va_end(ap);
+
+	return !p ? -errno : ul_path_read_u32(pc, res, p);
+}
+
+int ul_path_read_majmin(struct path_cxt *pc, dev_t *res, const char *path)
+{
+	int rc, maj = 0, min = 0;
+
+	rc = ul_path_scanf(pc, path, "%d:%d", &maj, &min);
+	if (rc != 2)
+		return -1;
+	if (res)
+		*res = makedev(maj, min);
+	return 0;
+}
+
+int ul_path_readf_majmin(struct path_cxt *pc, dev_t *res, const char *path, ...)
+{
+	const char *p;
+	va_list ap;
+
+	va_start(ap, path);
+	p = ul_path_mkpath(pc, path, ap);
+	va_end(ap);
+
+	return !p ? -errno : ul_path_read_majmin(pc, res, p);
+}
+
+int ul_path_write_string(struct path_cxt *pc, const char *str, const char *path)
+{
+	int rc, errsv;
+	int fd;
+
+	fd = ul_path_open(pc, O_WRONLY|O_CLOEXEC, path);
+	if (fd < 0)
+		return -errno;
+
+	rc = write_all(fd, str, strlen(str));
+
+	errsv = errno;
+	close(fd);
+	errno = errsv;
+	return rc;
+}
+
+int ul_path_writef_string(struct path_cxt *pc, const char *str, const char *path, ...)
+{
+	const char *p;
+	va_list ap;
+
+	va_start(ap, path);
+	p = ul_path_mkpath(pc, path, ap);
+	va_end(ap);
+
+	return !p ? -errno : ul_path_write_string(pc, str, p);
+}
+
+int ul_path_write_s64(struct path_cxt *pc, int64_t num, const char *path)
+{
+	char buf[sizeof(stringify_value(LLONG_MAX))];
+	int rc, errsv;
+	int fd, len;
+
+	fd = ul_path_open(pc, O_WRONLY|O_CLOEXEC, path);
+	if (fd < 0)
+		return -errno;
+
+	len = snprintf(buf, sizeof(buf), "%" PRId64, num);
+	if (len < 0 || (size_t) len >= sizeof(buf))
+		rc = len < 0 ? -errno : -E2BIG;
+	else
+		rc = write_all(fd, buf, len);
+
+	errsv = errno;
+	close(fd);
+	errno = errsv;
+	return rc;
+}
+
+int ul_path_write_u64(struct path_cxt *pc, uint64_t num, const char *path)
+{
+	char buf[sizeof(stringify_value(ULLONG_MAX))];
+	int rc, errsv;
+	int fd, len;
+
+	fd = ul_path_open(pc, O_WRONLY|O_CLOEXEC, path);
+	if (fd < 0)
+		return -errno;
+
+	len = snprintf(buf, sizeof(buf), "%" PRIu64, num);
+	if (len < 0 || (size_t) len >= sizeof(buf))
+		rc = len < 0 ? -errno : -E2BIG;
+	else
+		rc = write_all(fd, buf, len);
+
+	errsv = errno;
+	close(fd);
+	errno = errsv;
+	return rc;
+}
+
+int ul_path_writef_u64(struct path_cxt *pc, uint64_t num, const char *path, ...)
+{
+	const char *p;
+	va_list ap;
+
+	va_start(ap, path);
+	p = ul_path_mkpath(pc, path, ap);
+	va_end(ap);
+
+	return !p ? -errno : ul_path_write_u64(pc, num, p);
+
+}
+
+int ul_path_count_dirents(struct path_cxt *pc, const char *path)
+{
+	DIR *dir;
+	int r = 0;
+
+	dir = ul_path_opendir(pc, path);
+	if (!dir)
+		return 0;
+
+	while (xreaddir(dir)) r++;
+
+	closedir(dir);
+	return r;
+}
+
+int ul_path_countf_dirents(struct path_cxt *pc, const char *path, ...)
+{
+	const char *p;
+	va_list ap;
+
+	va_start(ap, path);
+	p = ul_path_mkpath(pc, path, ap);
+	va_end(ap);
+
+	return !p ? -errno : ul_path_count_dirents(pc, p);
+}
+
+/* first call (when @sub is NULL) opens the directory, last call closes the directory */
+int ul_path_next_dirent(struct path_cxt *pc, DIR **sub, const char *dirname, struct dirent **d)
+{
+	if (!pc || !sub || !d)
+		return -EINVAL;
+
+	if (!*sub) {
+		*sub = ul_path_opendir(pc, dirname);
+		if (!*sub)
+			return -errno;
+	}
+
+	*d = xreaddir(*sub);
+	if (*d)
+		return 0;
+
+	closedir(*sub);
+	*sub = NULL;
+	return 1;
+}
+
+/*
+ * Like fopen() but, @path is always prefixed by @prefix. This function is
+ * useful in case when ul_path_* API is overkill.
+ */
+FILE *ul_prefix_fopen(const char *prefix, const char *path, const char *mode)
+{
+	char buf[PATH_MAX];
+
+	if (!path)
+		return NULL;
+	if (!prefix)
+		return fopen(path, mode);
+	if (*path == '/')
+		path++;
+
+	snprintf(buf, sizeof(buf), "%s/%s", prefix, path);
+	return fopen(buf, mode);
+}
+
+#ifdef HAVE_CPU_SET_T
+static int ul_path_cpuparse(struct path_cxt *pc, cpu_set_t **set, int maxcpus, int islist, const char *path, va_list ap)
+{
+	FILE *f;
+	size_t setsize, len = maxcpus * 7;
+	char buf[len];
+	int rc;
+
+	*set = NULL;
+
+	f = ul_path_vfopenf(pc, "r" UL_CLOEXECSTR, path, ap);
+	if (!f)
+		return -errno;
+
+	if (fgets(buf, len, f) == NULL) {
+		errno = EIO;
+		rc = -errno;
+	} else
+		rc = 0;
+
+	fclose(f);
+
+	if (rc)
+		return rc;
+
+	len = strlen(buf);
+	if (len > 0 && buf[len - 1] == '\n')
+		buf[len - 1] = '\0';
+
+	*set = cpuset_alloc(maxcpus, &setsize, NULL);
+	if (!*set)
+		return -ENOMEM;
+
+	if (islist) {
+		if (cpulist_parse(buf, *set, setsize, 0)) {
+			cpuset_free(*set);
+			errno = EINVAL;
+			rc = -errno;
+			return rc;
+		}
+	} else {
+		if (cpumask_parse(buf, *set, setsize)) {
+			cpuset_free(*set);
+			errno = EINVAL;
+			rc = -errno;
+			return rc;
+		}
+	}
+	return 0;
+}
+
+int ul_path_readf_cpuset(struct path_cxt *pc, cpu_set_t **set, int maxcpus, const char *path, ...)
+{
+	va_list ap;
+	int rc = 0;
+
+	va_start(ap, path);
+	rc = ul_path_cpuparse(pc, set, maxcpus, 0, path, ap);
+	va_end(ap);
+
+	return rc;
+}
+
+int ul_path_readf_cpulist(struct path_cxt *pc, cpu_set_t **set, int maxcpus, const char *path, ...)
+{
+	va_list ap;
+	int rc = 0;
+
+	va_start(ap, path);
+	rc = ul_path_cpuparse(pc, set, maxcpus, 1, path, ap);
+	va_end(ap);
+
+	return rc;
+}
+
+#endif /* HAVE_CPU_SET_T */
+
+
+#ifdef TEST_PROGRAM_PATH
+#include <getopt.h>
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+	fprintf(stdout, " %s [options] <dir> <command>\n\n", program_invocation_short_name);
+	fputs(" -p, --prefix <dir>      redirect hardcoded paths to <dir>\n", stdout);
+
+	fputs(" Commands:\n", stdout);
+	fputs(" read-u64 <file>            read uint64_t from file\n", stdout);
+	fputs(" read-s64 <file>            read  int64_t from file\n", stdout);
+	fputs(" read-u32 <file>            read uint32_t from file\n", stdout);
+	fputs(" read-s32 <file>            read  int32_t from file\n", stdout);
+	fputs(" read-string <file>         read string  from file\n", stdout);
+	fputs(" read-majmin <file>         read devno from file\n", stdout);
+	fputs(" read-link <file>           read symlink\n", stdout);
+	fputs(" write-string <file> <str>  write string from file\n", stdout);
+	fputs(" write-u64 <file> <str>     write uint64_t from file\n", stdout);
+
+	exit(EXIT_SUCCESS);
+}
+
+int main(int argc, char *argv[])
+{
+	int c;
+	const char *prefix = NULL, *dir, *file, *command;
+	struct path_cxt *pc = NULL;
+
+	static const struct option longopts[] = {
+		{ "prefix",	1, NULL, 'p' },
+		{ "help",       0, NULL, 'h' },
+		{ NULL, 0, NULL, 0 },
+	};
+
+	while((c = getopt_long(argc, argv, "p:h", longopts, NULL)) != -1) {
+		switch(c) {
+		case 'p':
+			prefix = optarg;
+			break;
+		case 'h':
+			usage();
+			break;
+		default:
+			err(EXIT_FAILURE, "try --help");
+		}
+	}
+
+	if (optind == argc)
+		errx(EXIT_FAILURE, "<dir> not defined");
+	dir = argv[optind++];
+
+	ul_path_init_debug();
+
+	pc = ul_new_path("%s", dir);
+	if (!pc)
+		err(EXIT_FAILURE, "failed to initialize path context");
+	if (prefix)
+		ul_path_set_prefix(pc, prefix);
+
+	if (optind == argc)
+		errx(EXIT_FAILURE, "<command> not defined");
+	command = argv[optind++];
+
+	if (strcmp(command, "read-u32") == 0) {
+		uint32_t res;
+
+		if (optind == argc)
+			errx(EXIT_FAILURE, "<file> not defined");
+		file = argv[optind++];
+
+		if (ul_path_read_u32(pc, &res, file) != 0)
+			err(EXIT_FAILURE, "read u64 failed");
+		printf("read:  %s: %u\n", file, res);
+
+		if (ul_path_readf_u32(pc, &res, "%s", file) != 0)
+			err(EXIT_FAILURE, "readf u64 failed");
+		printf("readf: %s: %u\n", file, res);
+
+	} else if (strcmp(command, "read-s32") == 0) {
+		int32_t res;
+
+		if (optind == argc)
+			errx(EXIT_FAILURE, "<file> not defined");
+		file = argv[optind++];
+
+		if (ul_path_read_s32(pc, &res, file) != 0)
+			err(EXIT_FAILURE, "read u64 failed");
+		printf("read:  %s: %d\n", file, res);
+
+		if (ul_path_readf_s32(pc, &res, "%s", file) != 0)
+			err(EXIT_FAILURE, "readf u64 failed");
+		printf("readf: %s: %d\n", file, res);
+
+	} else if (strcmp(command, "read-u64") == 0) {
+		uint64_t res;
+
+		if (optind == argc)
+			errx(EXIT_FAILURE, "<file> not defined");
+		file = argv[optind++];
+
+		if (ul_path_read_u64(pc, &res, file) != 0)
+			err(EXIT_FAILURE, "read u64 failed");
+		printf("read:  %s: %" PRIu64 "\n", file, res);
+
+		if (ul_path_readf_u64(pc, &res, "%s", file) != 0)
+			err(EXIT_FAILURE, "readf u64 failed");
+		printf("readf: %s: %" PRIu64 "\n", file, res);
+
+	} else if (strcmp(command, "read-s64") == 0) {
+		int64_t res;
+
+		if (optind == argc)
+			errx(EXIT_FAILURE, "<file> not defined");
+		file = argv[optind++];
+
+		if (ul_path_read_s64(pc, &res, file) != 0)
+			err(EXIT_FAILURE, "read u64 failed");
+		printf("read:  %s: %" PRIu64 "\n", file, res);
+
+		if (ul_path_readf_s64(pc, &res, "%s", file) != 0)
+			err(EXIT_FAILURE, "readf u64 failed");
+		printf("readf: %s: %" PRIu64 "\n", file, res);
+
+	} else if (strcmp(command, "read-majmin") == 0) {
+		dev_t res;
+
+		if (optind == argc)
+			errx(EXIT_FAILURE, "<file> not defined");
+		file = argv[optind++];
+
+		if (ul_path_read_majmin(pc, &res, file) != 0)
+			err(EXIT_FAILURE, "read maj:min failed");
+		printf("read:  %s: %d\n", file, (int) res);
+
+		if (ul_path_readf_majmin(pc, &res, "%s", file) != 0)
+			err(EXIT_FAILURE, "readf maj:min failed");
+		printf("readf: %s: %d\n", file, (int) res);
+
+	} else if (strcmp(command, "read-string") == 0) {
+		char *res;
+
+		if (optind == argc)
+			errx(EXIT_FAILURE, "<file> not defined");
+		file = argv[optind++];
+
+		if (ul_path_read_string(pc, &res, file) <= 0)
+			err(EXIT_FAILURE, "read string failed");
+		printf("read:  %s: %s\n", file, res);
+
+		if (ul_path_readf_string(pc, &res, "%s", file) <= 0)
+			err(EXIT_FAILURE, "readf string failed");
+		printf("readf: %s: %s\n", file, res);
+
+	} else if (strcmp(command, "read-link") == 0) {
+		char res[PATH_MAX];
+
+		if (optind == argc)
+			errx(EXIT_FAILURE, "<file> not defined");
+		file = argv[optind++];
+
+		if (ul_path_readlink(pc, res, sizeof(res), file) < 0)
+			err(EXIT_FAILURE, "read symlink failed");
+		printf("read:  %s: %s\n", file, res);
+
+		if (ul_path_readlinkf(pc, res, sizeof(res), "%s", file) < 0)
+			err(EXIT_FAILURE, "readf symlink failed");
+		printf("readf: %s: %s\n", file, res);
+
+	} else if (strcmp(command, "write-string") == 0) {
+		char *str;
+
+		if (optind + 1 == argc)
+			errx(EXIT_FAILURE, "<file> <string> not defined");
+		file = argv[optind++];
+		str = argv[optind++];
+
+		if (ul_path_write_string(pc, str, file) != 0)
+			err(EXIT_FAILURE, "write string failed");
+		if (ul_path_writef_string(pc, str, "%s", file) != 0)
+			err(EXIT_FAILURE, "writef string failed");
+
+	} else if (strcmp(command, "write-u64") == 0) {
+		uint64_t num;
+
+		if (optind + 1 == argc)
+			errx(EXIT_FAILURE, "<file> <num> not defined");
+		file = argv[optind++];
+		num = strtoumax(argv[optind++], NULL, 0);
+
+		if (ul_path_write_u64(pc, num, file) != 0)
+			err(EXIT_FAILURE, "write u64 failed");
+		if (ul_path_writef_u64(pc, num, "%s", file) != 0)
+			err(EXIT_FAILURE, "writef u64 failed");
+	}
+
+	ul_unref_path(pc);
+	return EXIT_SUCCESS;
+}
+#endif /* TEST_PROGRAM_PATH */
+
diff --git a/lib/plymouth-ctrl.c b/lib/plymouth-ctrl.c
new file mode 100644
index 0000000..2d3deda
--- /dev/null
+++ b/lib/plymouth-ctrl.c
@@ -0,0 +1,144 @@
+/*
+ * plymouth-ctrl.c	Simply communications with plymouthd
+ *			to avoid forked sub processes and/or
+ *			missed plymouth send commands tool
+ *			due a plymouthd replacement.
+ *
+ * Copyright (c) 2016 SUSE Linux GmbH, All rights reserved.
+ * Copyright (c) 2016 Werner Fink <werner@suse.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program (see the file COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ *
+ * Author: Werner Fink <werner@suse.de>
+ */
+
+#include <errno.h>
+#include <limits.h>
+#include <poll.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/un.h>
+#include <unistd.h>
+
+#include "all-io.h"
+#include "c.h"
+#include "nls.h"
+#include "plymouth-ctrl.h"
+
+static int can_read(int fd, const long timeout)
+{
+	struct pollfd fds = {
+		.fd = fd,
+		.events = POLLIN|POLLPRI,
+		.revents = 0,
+	};
+	int ret;
+
+	do {
+		ret = poll(&fds, 1, timeout);
+	} while ((ret < 0) && (errno == EINTR));
+
+	return (ret == 1) && (fds.revents & (POLLIN|POLLPRI));
+}
+
+static int open_un_socket_and_connect(void)
+{
+	/* The abstract UNIX socket of plymouth */
+	struct sockaddr_un su = {
+		.sun_family = AF_UNIX,
+		.sun_path = PLYMOUTH_SOCKET_PATH,
+	};
+	const int one = 1;
+	int fd, ret;
+
+	fd = socket(PF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
+	if (fd < 0) {
+		warnx(_("cannot open UNIX socket"));
+		goto err;
+	}
+
+	ret = setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
+	if (ret < 0) {
+		warnx(_("cannot set option for UNIX socket"));
+		close(fd);
+		fd = -1;
+		goto err;
+	}
+
+	/* Note, the abstract PLYMOUTH_SOCKET_PATH has a leading NULL byte */
+	ret = connect(fd, (struct sockaddr *) &su,
+		offsetof(struct sockaddr_un, sun_path) + 1 + strlen(su.sun_path+1));
+	if (ret < 0) {
+		if (errno != ECONNREFUSED)
+			warnx(_("cannot connect on UNIX socket"));
+		close(fd);
+		fd = -1;
+		goto err;
+	}
+err:
+	return fd;
+}
+
+int plymouth_command(int cmd, ...)
+{
+	uint8_t answer[2], command[2];
+	struct sigaction sp, op;
+	int fdsock = -1, ret = 0;
+
+	sigemptyset (&sp.sa_mask);
+	sp.sa_handler = SIG_IGN;
+	sp.sa_flags = SA_RESTART;
+	sigaction(SIGPIPE, &sp, &op);
+
+	/* The plymouthd does read at least two bytes. */
+	command[1] = '\0';
+	switch (cmd) {
+	case MAGIC_PING:
+		fdsock = open_un_socket_and_connect();
+		if (fdsock >= 0) {
+			command[0] = cmd;
+			write_all(fdsock, command, sizeof(command));
+		}
+		break;
+	case MAGIC_QUIT:
+		fdsock = open_un_socket_and_connect();
+		if (fdsock >= 0) {
+			command[0] = cmd;
+			write_all(fdsock, command, sizeof(command));
+		}
+		break;
+	default:
+		warnx(_("the plymouth request %c is not implemented"), cmd);
+	case '?':
+		goto err;
+	}
+
+	answer[0] = '\0';
+	if (fdsock >= 0) {
+		if (can_read(fdsock, 1000))
+			read_all(fdsock, (char *) &answer[0], sizeof(answer));
+		close(fdsock);
+	}
+	sigaction(SIGPIPE, &op, NULL);
+	ret = (answer[0] == ANSWER_ACK) ? 1 : 0;
+err:
+	return ret;
+}
+
diff --git a/lib/procfs.c b/lib/procfs.c
new file mode 100644
index 0000000..aff20fb
--- /dev/null
+++ b/lib/procfs.c
@@ -0,0 +1,640 @@
+/*
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Copyright (C) 2021 Karel Zak <kzak@redhat.com>
+ */
+#include <ctype.h>
+#include <unistd.h>
+#include <errno.h>
+
+#ifdef HAVE_SYS_VFS_H
+# include <sys/vfs.h>
+# include "statfs_magic.h"
+#endif
+
+#include "c.h"
+#include "pathnames.h"
+#include "procfs.h"
+#include "fileutils.h"
+#include "all-io.h"
+#include "debug.h"
+#include "strutils.h"
+
+static void procfs_process_deinit_path(struct path_cxt *pc);
+
+/*
+ * Debug stuff (based on include/debug.h)
+ */
+static UL_DEBUG_DEFINE_MASK(ulprocfs);
+UL_DEBUG_DEFINE_MASKNAMES(ulprocfs) = UL_DEBUG_EMPTY_MASKNAMES;
+
+#define ULPROCFS_DEBUG_INIT	(1 << 1)
+#define ULPROCFS_DEBUG_CXT	(1 << 2)
+
+#define DBG(m, x)       __UL_DBG(ulprocfs, ULPROCFS_DEBUG_, m, x)
+#define ON_DBG(m, x)    __UL_DBG_CALL(ulprocfs, ULPROCFS_DEBUG_, m, x)
+
+#define UL_DEBUG_CURRENT_MASK	UL_DEBUG_MASK(ulprocfs)
+#include "debugobj.h"
+
+void ul_procfs_init_debug(void)
+{
+	if (ulprocfs_debug_mask)
+		return;
+	__UL_INIT_DEBUG_FROM_ENV(ulprocfs, ULPROCFS_DEBUG_, 0, ULPROCFS_DEBUG);
+}
+
+struct path_cxt *ul_new_procfs_path(pid_t pid, const char *prefix)
+{
+	struct path_cxt *pc = ul_new_path(NULL);
+
+	if (!pc)
+		return NULL;
+	if (prefix)
+		ul_path_set_prefix(pc, prefix);
+
+	if (procfs_process_init_path(pc, pid) != 0) {
+		ul_unref_path(pc);
+		return NULL;
+	}
+
+	DBG(CXT, ul_debugobj(pc, "alloc"));
+	return pc;
+}
+
+/*
+ * procfs_blkdev_* is procfs extension to ul_path_* API to read info about process.
+ *
+ * The function is possible to call in loop and without sysfs_procfs_deinit_path().
+ * The procfs_process_deinit_path() is automatically called by ul_unref_path().
+ *
+ */
+int procfs_process_init_path(struct path_cxt *pc, pid_t pid)
+{
+	struct procfs_process *prc;
+	int rc;
+	char buf[sizeof(_PATH_PROC) + sizeof(stringify_value(UINT32_MAX)) + 2];
+
+	/* define path to pid stuff */
+	snprintf(buf, sizeof(buf), _PATH_PROC "/%zu", (size_t) pid);
+	rc = ul_path_set_dir(pc, buf);
+	if (rc)
+		return rc;
+
+	/* make sure path exists */
+	rc = ul_path_get_dirfd(pc);
+	if (rc < 0)
+		return rc;
+
+	/* initialize procfs specific stuff */
+	prc = ul_path_get_dialect(pc);
+	if (!prc) {
+		DBG(CXT, ul_debugobj(pc, "alloc new procfs handler"));
+		prc = calloc(1, sizeof(struct procfs_process));
+		if (!prc)
+			return -ENOMEM;
+
+		ul_path_set_dialect(pc, prc, procfs_process_deinit_path);
+	}
+
+	DBG(CXT, ul_debugobj(pc, "init procfs stuff"));
+
+	prc->pid = pid;
+	return 0;
+}
+
+static void procfs_process_deinit_path(struct path_cxt *pc)
+{
+	struct procfs_process *prc;
+
+	if (!pc)
+		return;
+
+	DBG(CXT, ul_debugobj(pc, "deinit"));
+
+	prc = ul_path_get_dialect(pc);
+	if (!prc)
+		return;
+
+	free(prc);
+	ul_path_set_dialect(pc, NULL, NULL);
+}
+
+static ssize_t read_procfs_file(int fd, char *buf, size_t bufsz)
+{
+	ssize_t sz = 0;
+	size_t i;
+
+	if (fd < 0)
+		return -EINVAL;
+
+	sz = read_all(fd, buf, bufsz);
+	if (sz <= 0)
+		return sz;
+
+	for (i = 0; i < (size_t) sz; i++) {
+		if (buf[i] == '\0')
+			buf[i] = ' ';
+	}
+	buf[sz - 1] = '\0';
+	return sz;
+}
+
+static ssize_t procfs_process_get_data_for(struct path_cxt *pc, char *buf, size_t bufsz,
+					    const char *fname)
+{
+	int fd = ul_path_open(pc, O_RDONLY|O_CLOEXEC, fname);
+
+	if (fd >= 0) {
+		ssize_t sz = read_procfs_file(fd, buf, bufsz);
+		close(fd);
+		return sz;
+	}
+	return -errno;
+}
+
+ssize_t procfs_process_get_cmdline(struct path_cxt *pc, char *buf, size_t bufsz)
+{
+	return procfs_process_get_data_for(pc, buf, bufsz, "cmdline");
+}
+
+ssize_t procfs_process_get_cmdname(struct path_cxt *pc, char *buf, size_t bufsz)
+{
+	return procfs_process_get_data_for(pc, buf, bufsz, "comm");
+}
+
+ssize_t procfs_process_get_stat(struct path_cxt *pc, char *buf, size_t bufsz)
+{
+	return procfs_process_get_data_for(pc, buf, bufsz, "stat");
+}
+
+int procfs_process_get_stat_nth(struct path_cxt *pc, int n, uintmax_t *re)
+{
+	ssize_t rc;
+	char *key = NULL, *tok, *p;
+	char buf[BUFSIZ];
+	int i;
+
+	if (n == 2 || n == 3)		/* process name and status (strings) */
+		return -EINVAL;
+
+	rc = procfs_process_get_data_for(pc, buf, sizeof(buf), "stat");
+	if (rc < 0)
+		return rc;
+
+	for (i = 0, tok = strtok_r(buf, " ", &key); tok;
+	     tok = strtok_r(NULL, " ", &key)) {
+
+		i++;
+		if (i == n)
+			return ul_strtou64(tok, re, 10);
+
+		/* skip rest of the process name */
+		if (i == 2 && (p = strrchr(key, ')')))
+			key = p + 2;
+	}
+
+	return -EINVAL;
+}
+
+int procfs_process_get_uid(struct path_cxt *pc, uid_t *uid)
+{
+	struct stat sb;
+	int rc;
+
+	if ((rc = ul_path_stat(pc, &sb, 0, NULL)) == 0)
+		*uid = sb.st_uid;
+	return rc;
+}
+
+/*
+ * returns the next task TID, the @sub is automatically initialized
+ * when called first time and closed after last call or you can
+ * call closedir()* when you need to break the loop.
+ *
+ * Returns: <0 on error, 0 on success, >1 done
+ *
+ * Example:
+ *
+ * pid_t tid;
+ * DIR *sub = NULL;
+ * path_cxt *pc = ul_new_procfs_path(123, NULL);
+ *
+ * while (procfs_process_next_tid(pc, &sub, &tid) == 0)
+ *	printf("task: %d", (int) tid);
+ *
+ */
+int procfs_process_next_tid(struct path_cxt *pc, DIR **sub, pid_t *tid)
+{
+	struct dirent *d;
+
+	if (!pc || !sub || !tid)
+		return -EINVAL;
+
+	if (!*sub) {
+		*sub = ul_path_opendir(pc, "task");
+		if (!*sub)
+			return -errno;
+	}
+
+	while ((d = xreaddir(*sub))) {
+		if (procfs_dirent_get_pid(d, tid) == 0)
+			return 0;
+	}
+
+	closedir(*sub);
+	*sub = NULL;
+	return 1;
+}
+
+int procfs_process_next_fd(struct path_cxt *pc, DIR **sub, int *fd)
+{
+	struct dirent *d;
+
+	if (!pc || !sub || !fd)
+		return -EINVAL;
+
+	if (!*sub) {
+		*sub = ul_path_opendir(pc, "fd");
+		if (!*sub)
+			return -errno;
+	}
+
+	while ((d = xreaddir(*sub))) {
+		uint64_t num;
+#ifdef _DIRENT_HAVE_D_TYPE
+		if (d->d_type != DT_LNK && d->d_type != DT_UNKNOWN)
+			continue;
+#endif
+		if (ul_strtou64(d->d_name, &num, 10) < 0)
+			continue;
+		*fd = num;
+		return 0;
+	}
+
+	closedir(*sub);
+	*sub = NULL;
+	return 1;
+}
+
+/*
+ * Simple 'dirent' based stuff for use-cases where procfs_process_* API is overkill
+ */
+
+/* stupid, but good enough as a basic filter */
+int procfs_dirent_is_process(struct dirent *d)
+{
+#ifdef _DIRENT_HAVE_D_TYPE
+	if (d->d_type != DT_DIR && d->d_type != DT_UNKNOWN)
+		return 0;
+#endif
+	if (!isdigit((unsigned char) *d->d_name))
+		return 0;
+
+	return 1;
+}
+
+int procfs_dirent_get_pid(struct dirent *d, pid_t *pid)
+{
+	uint64_t num;
+
+	if (!procfs_dirent_is_process(d))
+		return -EINVAL;
+
+	if (ul_strtou64(d->d_name, &num, 10) < 0)
+		return -EINVAL;
+
+	*pid = (pid_t) num;
+	return 0;
+}
+
+int procfs_dirent_get_uid(DIR *procfs, struct dirent *d, uid_t *uid)
+{
+	struct stat st;
+
+	if (!procfs_dirent_is_process(d))
+		return -EINVAL;
+
+	if (fstatat(dirfd(procfs), d->d_name, &st, 0))
+		return -EINVAL;
+
+	*uid = st.st_uid;
+	return 0;
+}
+
+int procfs_dirent_match_uid(DIR *procfs, struct dirent *d, uid_t uid)
+{
+	uid_t x;
+
+	if (procfs_dirent_get_uid(procfs, d, &x) == 0)
+		return x == uid;
+
+	return 0;
+}
+
+/* "name" of process; may be truncated, see prctl(2) and PR_SET_NAME.
+ * The minimal of the @buf has to be 32 bytes. */
+int procfs_dirent_get_name(DIR *procfs, struct dirent *d, char *buf, size_t bufsz)
+{
+	FILE *f;
+	size_t sz;
+	char tmp[1024], *p, *end = NULL;
+
+	if (bufsz < 32)
+		return -EINVAL;
+	if (!procfs_dirent_is_process(d))
+		return -EINVAL;
+
+	snprintf(tmp, sizeof(tmp), "%s/stat", d->d_name);
+	f = fopen_at(dirfd(procfs), tmp, O_CLOEXEC|O_RDONLY, "r");
+	if (!f)
+		return -errno;
+
+	p = fgets(tmp, sizeof(tmp), f);
+	fclose(f);
+	if (!p)
+		return -errno;
+
+	/* skip PID */
+	while (*p && *p != '(')
+		p++;
+
+	/* skip extra '(' */
+	while (*p && *p == '(')
+		p++;
+
+	end = p;
+	while (*end && *end != ')')
+		end++;
+
+	sz = end - p;
+	if (sz >= bufsz)
+		sz = bufsz - 1;
+
+	memcpy(buf, p, sz);
+	buf[sz] = '\0';
+
+	return 0;
+}
+
+int procfs_dirent_match_name(DIR *procfs, struct dirent *d, const char *name)
+{
+	char buf[33];
+
+	if (procfs_dirent_get_name(procfs, d, buf, sizeof(buf)) == 0)
+		return strcmp(name, buf) == 0;
+
+	return 0;
+}
+
+#ifdef HAVE_SYS_VFS_H
+/* checks if fd is file in a procfs;
+ * returns 1 if true, 0 if false or couldn't determine */
+int fd_is_procfs(int fd)
+{
+	struct statfs st;
+	int ret;
+
+	do {
+		errno = 0;
+		ret = fstatfs(fd, &st);
+
+		if (ret < 0) {
+			if (errno != EINTR && errno != EAGAIN)
+				return 0;
+			xusleep(250000);
+		}
+	} while (ret != 0);
+
+	return st.f_type == STATFS_PROC_MAGIC;
+	return 0;
+}
+#else
+int fd_is_procfs(int fd __attribute__((__unused__)))
+{
+	return 0;
+}
+#endif
+
+static char *strdup_procfs_file(pid_t pid, const char *name)
+{
+	char buf[BUFSIZ];
+	char *re = NULL;
+	int fd;
+
+	snprintf(buf, sizeof(buf), _PATH_PROC "/%d/%s", (int) pid, name);
+	fd = open(buf, O_CLOEXEC|O_RDONLY);
+	if (fd < 0)
+		return NULL;
+
+	if (read_procfs_file(fd, buf, sizeof(buf)) > 0)
+		re = strdup(buf);
+	close(fd);
+	return re;
+}
+
+char *pid_get_cmdname(pid_t pid)
+{
+	return strdup_procfs_file(pid, "comm");
+}
+
+char *pid_get_cmdline(pid_t pid)
+{
+	return strdup_procfs_file(pid, "cmdline");
+}
+
+#ifdef TEST_PROGRAM_PROCFS
+
+static int test_tasks(int argc, char *argv[], const char *prefix)
+{
+	DIR *sub = NULL;
+	struct path_cxt *pc;
+	pid_t tid = 0, pid;
+
+	if (argc != 2)
+		return EXIT_FAILURE;
+
+	pid = strtol(argv[1], (char **) NULL, 10);
+	printf("PID=%d, TIDs:", pid);
+
+	pc = ul_new_procfs_path(pid, prefix);
+	if (!pc)
+		err(EXIT_FAILURE, "alloc procfs handler failed");
+
+	while (procfs_process_next_tid(pc, &sub, &tid) == 0)
+		printf(" %d", tid);
+
+	printf("\n");
+        ul_unref_path(pc);
+	return EXIT_SUCCESS;
+}
+
+static int test_fds(int argc, char *argv[], const char *prefix)
+{
+	DIR *sub = NULL;
+	struct path_cxt *pc;
+	pid_t pid;
+	int fd = -1;
+
+	if (argc != 2)
+		return EXIT_FAILURE;
+
+	pid = strtol(argv[1], (char **) NULL, 10);
+	printf("PID=%d, FDs:", pid);
+
+	pc = ul_new_procfs_path(pid, prefix);
+	if (!pc)
+		err(EXIT_FAILURE, "alloc procfs handler failed");
+
+	while (procfs_process_next_fd(pc, &sub, &fd) == 0)
+		printf(" %d", fd);
+
+	fputc('\n', stdout);
+        ul_unref_path(pc);
+	return EXIT_SUCCESS;
+}
+
+static int test_processes(int argc, char *argv[])
+{
+	DIR *dir;
+	struct dirent *d;
+	char *name = NULL;
+	uid_t uid = (uid_t) -1;
+	char buf[128];
+
+	if (argc >= 3 && strcmp(argv[1], "--name") == 0)
+		name = argv[2];
+	if (argc >= 3 && strcmp(argv[1], "--uid") == 0)
+		uid = (uid_t) atol(argv[2]);
+
+	dir = opendir(_PATH_PROC);
+	if (!dir)
+		err(EXIT_FAILURE, "cannot open proc");
+
+	while ((d = xreaddir(dir))) {
+		pid_t pid = 0;
+
+		if (procfs_dirent_get_pid(d, &pid) != 0)
+			continue;
+		if (name && !procfs_dirent_match_name(dir, d, name))
+			continue;
+		if (uid != (uid_t) -1 && !procfs_dirent_match_uid(dir, d, uid))
+			continue;
+		procfs_dirent_get_name(dir, d, buf, sizeof(buf));
+		printf(" %d [%s]", pid, buf);
+	}
+
+	fputc('\n', stdout);
+	closedir(dir);
+	return EXIT_SUCCESS;
+}
+
+static int test_one_process(int argc, char *argv[], const char *prefix)
+{
+	pid_t pid;
+	struct path_cxt *pc;
+	char buf[BUFSIZ];
+	uid_t uid = (uid_t) -1;
+
+	if (argc != 2)
+		return EXIT_FAILURE;
+	pid = strtol(argv[1], (char **) NULL, 10);
+
+	pc = ul_new_procfs_path(pid, prefix);
+	if (!pc)
+		err(EXIT_FAILURE, "cannot alloc procfs handler");
+
+	printf("%d\n", (int) pid);
+
+	procfs_process_get_uid(pc, &uid);
+	printf("   UID: %zu\n", (size_t) uid);
+
+	procfs_process_get_cmdline(pc, buf, sizeof(buf));
+	printf("   CMDLINE: '%s'\n", buf);
+
+	procfs_process_get_cmdname(pc, buf, sizeof(buf));
+	printf("   COMM: '%s'\n", buf);
+
+	ul_unref_path(pc);
+	return EXIT_SUCCESS;
+}
+
+static int test_isprocfs(int argc, char *argv[])
+{
+	const char *name = argc > 1 ? argv[1] : "/proc";
+	int fd = open(name, O_RDONLY);
+	int is = 0;
+
+	if (fd >= 0) {
+		is = fd_is_procfs(fd);
+		close(fd);
+	} else
+		err(EXIT_FAILURE, "cannot open %s", name);
+
+	printf("%s: %s procfs\n", name, is ? "is" : "is NOT");
+	return is ? EXIT_SUCCESS : EXIT_FAILURE;
+}
+
+static int test_process_stat_nth(int argc, char *argv[], const char *prefix)
+{
+	pid_t pid;
+	struct path_cxt *pc;
+	uintmax_t num = 0;
+	int n, ret;
+
+	if (argc != 3)
+		return EXIT_FAILURE;
+	pid = strtol(argv[1], (char **) NULL, 10);
+	n = strtol(argv[2], (char **) NULL, 10);
+
+	pc = ul_new_procfs_path(pid, prefix);
+	if (!pc)
+		err(EXIT_FAILURE, "cannot alloc procfs handler");
+
+	ret = procfs_process_get_stat_nth(pc, n, &num);
+	if (ret)
+		errx(EXIT_FAILURE, "read %dth number failed: %s", n, strerror(-ret));
+
+	printf("%d: %dth %ju\n", (int) pid, n, num);
+	ul_unref_path(pc);
+	return EXIT_SUCCESS;
+}
+
+int main(int argc, char *argv[])
+{
+	const char *prefix = NULL;
+
+	if (argc > 2 && strcmp(argv[1], "--prefix") == 0) {
+		prefix = argv[2];
+		argc -= 2;
+		argv += 2;
+	}
+
+	if (argc < 2) {
+		fprintf(stderr, "usage: %1$s [--prefix <prefix>] --tasks <pid>\n"
+				"       %1$s [--prefix <prefix>] --fds <pid>\n"
+				"       %1$s --is-procfs [<dir>]\n"
+				"       %1$s --processes [--name <name>] [--uid <uid>]\n"
+				"       %1$s [--prefix <prefix>] --one <pid>\n"
+				"       %1$s [--prefix <prefix>] --stat-nth <pid> <n>\n",
+				program_invocation_short_name);
+		return EXIT_FAILURE;
+	}
+
+	if (strcmp(argv[1], "--tasks") == 0)
+		return test_tasks(argc - 1, argv + 1, prefix);
+	if (strcmp(argv[1], "--fds") == 0)
+		return test_fds(argc - 1, argv + 1, prefix);
+	if (strcmp(argv[1], "--processes") == 0)
+		return test_processes(argc - 1, argv + 1);
+	if (strcmp(argv[1], "--is-procfs") == 0)
+		return test_isprocfs(argc - 1, argv + 1);
+	if (strcmp(argv[1], "--one") == 0)
+		return test_one_process(argc - 1, argv + 1, prefix);
+	if (strcmp(argv[1], "--stat-nth") == 0)
+		return test_process_stat_nth(argc - 1, argv + 1, prefix);
+
+	return EXIT_FAILURE;
+}
+#endif /* TEST_PROGRAM_PROCUTILS */
diff --git a/lib/pty-session.c b/lib/pty-session.c
new file mode 100644
index 0000000..3849065
--- /dev/null
+++ b/lib/pty-session.c
@@ -0,0 +1,861 @@
+/*
+ * This is pseudo-terminal container for child process where parent creates a
+ * proxy between the current std{in,out,etrr} and the child's pty. Advantages:
+ *
+ * - child has no access to parent's terminal (e.g. su --pty)
+ * - parent can log all traffic between user and child's terminal (e.g. script(1))
+ * - it's possible to start commands on terminal although parent has no terminal
+ *
+ * This code is in the public domain; do with it what you wish.
+ *
+ * Written by Karel Zak <kzak@redhat.com> in Jul 2019
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <pty.h>
+#include <poll.h>
+#include <sys/signalfd.h>
+#include <paths.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <inttypes.h>
+
+#include "c.h"
+#include "all-io.h"
+#include "ttyutils.h"
+#include "pty-session.h"
+#include "monotonic.h"
+#include "debug.h"
+
+static UL_DEBUG_DEFINE_MASK(ulpty);
+UL_DEBUG_DEFINE_MASKNAMES(ulpty) = UL_DEBUG_EMPTY_MASKNAMES;
+
+#define ULPTY_DEBUG_INIT	(1 << 1)
+#define ULPTY_DEBUG_SETUP	(1 << 2)
+#define ULPTY_DEBUG_SIG		(1 << 3)
+#define ULPTY_DEBUG_IO		(1 << 4)
+#define ULPTY_DEBUG_DONE	(1 << 5)
+#define ULPTY_DEBUG_ALL		0xFFFF
+
+#define DBG(m, x)       __UL_DBG(ulpty, ULPTY_DEBUG_, m, x)
+#define ON_DBG(m, x)    __UL_DBG_CALL(ulpty, ULPTY_DEBUG_, m, x)
+
+#define UL_DEBUG_CURRENT_MASK   UL_DEBUG_MASK(ulpty)
+#include "debugobj.h"
+
+void ul_pty_init_debug(int mask)
+{
+	if (ulpty_debug_mask)
+		return;
+	__UL_INIT_DEBUG_FROM_ENV(ulpty, ULPTY_DEBUG_, mask, ULPTY_DEBUG);
+}
+
+struct ul_pty *ul_new_pty(int is_stdin_tty)
+{
+	struct ul_pty *pty = calloc(1, sizeof(*pty));
+
+	if (!pty)
+		return NULL;
+
+	DBG(SETUP, ul_debugobj(pty, "alloc handler"));
+	pty->isterm = is_stdin_tty;
+	pty->master = -1;
+	pty->slave = -1;
+	pty->sigfd = -1;
+	pty->child = (pid_t) -1;
+
+	return pty;
+}
+
+void ul_free_pty(struct ul_pty *pty)
+{
+	struct ul_pty_child_buffer *hd;
+
+	while ((hd = pty->child_buffer_head)) {
+		pty->child_buffer_head = hd->next;
+		free(hd);
+	}
+
+	while ((hd = pty->free_buffers)) {
+		pty->free_buffers = hd->next;
+		free(hd);
+	}
+	free(pty);
+}
+
+void ul_pty_slave_echo(struct ul_pty *pty, int enable)
+{
+	assert(pty);
+	pty->slave_echo = enable ? 1 : 0;
+}
+
+int ul_pty_get_delivered_signal(struct ul_pty *pty)
+{
+	assert(pty);
+	return pty->delivered_signal;
+}
+
+struct ul_pty_callbacks *ul_pty_get_callbacks(struct ul_pty *pty)
+{
+	assert(pty);
+	return &pty->callbacks;
+}
+
+void ul_pty_set_callback_data(struct ul_pty *pty, void *data)
+{
+	assert(pty);
+	pty->callback_data = data;
+}
+
+void ul_pty_set_child(struct ul_pty *pty, pid_t child)
+{
+	assert(pty);
+	pty->child = child;
+}
+
+int ul_pty_get_childfd(struct ul_pty *pty)
+{
+	assert(pty);
+	return pty->master;
+}
+
+pid_t ul_pty_get_child(struct ul_pty *pty)
+{
+	assert(pty);
+	return pty->child;
+}
+
+/* it's active when signals are redirected to sigfd */
+int ul_pty_is_running(struct ul_pty *pty)
+{
+	assert(pty);
+	return pty->sigfd >= 0;
+}
+
+void ul_pty_set_mainloop_time(struct ul_pty *pty, struct timeval *tv)
+{
+	assert(pty);
+	if (!tv) {
+		DBG(IO, ul_debugobj(pty, "mainloop time: clear"));
+		timerclear(&pty->next_callback_time);
+	} else {
+		pty->next_callback_time.tv_sec = tv->tv_sec;
+		pty->next_callback_time.tv_usec = tv->tv_usec;
+		DBG(IO, ul_debugobj(pty, "mainloop time: %"PRId64".%06"PRId64,
+				(int64_t) tv->tv_sec, (int64_t) tv->tv_usec));
+	}
+}
+
+static void pty_signals_cleanup(struct ul_pty *pty)
+{
+	if (pty->sigfd != -1)
+		close(pty->sigfd);
+	pty->sigfd = -1;
+
+	/* restore original setting */
+	sigprocmask(SIG_SETMASK, &pty->orgsig, NULL);
+}
+
+/* call me before fork() */
+int ul_pty_setup(struct ul_pty *pty)
+{
+	struct termios attrs;
+	int rc = 0;
+
+	assert(pty->sigfd == -1);
+
+	/* save the current signals setting (to make ul_pty_cleanup() usable,
+	 * otherwise see ul_pty_signals_setup() */
+	sigprocmask(0, NULL, &pty->orgsig);
+
+	if (pty->isterm) {
+	        DBG(SETUP, ul_debugobj(pty, "create for terminal"));
+
+		/* original setting of the current terminal */
+		if (tcgetattr(STDIN_FILENO, &pty->stdin_attrs) != 0) {
+			rc = -errno;
+			goto done;
+		}
+
+		attrs = pty->stdin_attrs;
+		if (pty->slave_echo)
+			attrs.c_lflag |= ECHO;
+		else
+			attrs.c_lflag &= ~ECHO;
+
+		ioctl(STDIN_FILENO, TIOCGWINSZ, (char *)&pty->win);
+		/* create master+slave */
+		rc = openpty(&pty->master, &pty->slave, NULL, &attrs, &pty->win);
+		if (rc)
+			goto done;
+
+		/* set the current terminal to raw mode; pty_cleanup() reverses this change on exit */
+		cfmakeraw(&attrs);
+		tcsetattr(STDIN_FILENO, TCSANOW, &attrs);
+	} else {
+		DBG(SETUP, ul_debugobj(pty, "create for non-terminal"));
+
+		rc = openpty(&pty->master, &pty->slave, NULL, NULL, NULL);
+		if (rc)
+			goto done;
+
+		tcgetattr(pty->slave, &attrs);
+
+		if (pty->slave_echo)
+			attrs.c_lflag |= ECHO;
+		else
+			attrs.c_lflag &= ~ECHO;
+
+		tcsetattr(pty->slave, TCSANOW, &attrs);
+	}
+
+	fcntl(pty->master, F_SETFL, O_NONBLOCK);
+
+done:
+	if (rc)
+		ul_pty_cleanup(pty);
+
+	DBG(SETUP, ul_debugobj(pty, "pty setup done [master=%d, slave=%d, rc=%d]",
+				pty->master, pty->slave, rc));
+	return rc;
+}
+
+/* call me before fork() */
+int ul_pty_signals_setup(struct ul_pty *pty)
+{
+	sigset_t ourset;
+	int rc = 0;
+
+	assert(pty->sigfd == -1);
+
+	/* save the current signals setting */
+	sigprocmask(0, NULL, &pty->orgsig);
+
+	sigfillset(&ourset);
+	if (sigprocmask(SIG_BLOCK, &ourset, NULL)) {
+		rc = -errno;
+		goto done;
+	}
+
+	sigemptyset(&ourset);
+	sigaddset(&ourset, SIGCHLD);
+	sigaddset(&ourset, SIGWINCH);
+	sigaddset(&ourset, SIGALRM);
+	sigaddset(&ourset, SIGTERM);
+	sigaddset(&ourset, SIGINT);
+	sigaddset(&ourset, SIGQUIT);
+
+	if (pty->callbacks.flush_logs)
+		sigaddset(&ourset, SIGUSR1);
+
+	if ((pty->sigfd = signalfd(-1, &ourset, SFD_CLOEXEC)) < 0)
+		rc = -errno;
+done:
+	if (rc)
+		ul_pty_cleanup(pty);
+
+	DBG(SETUP, ul_debugobj(pty, "pty signals setup done [rc=%d]", rc));
+	return rc;
+}
+
+/* cleanup in parent process */
+void ul_pty_cleanup(struct ul_pty *pty)
+{
+	struct termios rtt;
+
+	pty_signals_cleanup(pty);
+
+	if (pty->master == -1 || !pty->isterm)
+		return;
+
+	DBG(DONE, ul_debugobj(pty, "cleanup"));
+	rtt = pty->stdin_attrs;
+	tcsetattr(STDIN_FILENO, TCSADRAIN, &rtt);
+}
+
+int ul_pty_chownmod_slave(struct ul_pty *pty, uid_t uid, gid_t gid, mode_t mode)
+{
+	if (fchown(pty->slave, uid, gid))
+		return -errno;
+	if (fchmod(pty->slave, mode))
+		return -errno;
+	return 0;
+}
+
+/* call me in child process */
+void ul_pty_init_slave(struct ul_pty *pty)
+{
+	DBG(SETUP, ul_debugobj(pty, "initialize slave"));
+
+	setsid();
+
+	ioctl(pty->slave, TIOCSCTTY, 1);
+	close(pty->master);
+
+	dup2(pty->slave, STDIN_FILENO);
+	dup2(pty->slave, STDOUT_FILENO);
+	dup2(pty->slave, STDERR_FILENO);
+
+	close(pty->slave);
+
+	if (pty->sigfd >= 0)
+		close(pty->sigfd);
+
+	pty->slave = -1;
+	pty->master = -1;
+	pty->sigfd = -1;
+
+	sigprocmask(SIG_SETMASK, &pty->orgsig, NULL);
+
+	DBG(SETUP, ul_debugobj(pty, "... initialize slave done"));
+}
+
+static int write_output(char *obuf, ssize_t bytes)
+{
+	DBG(IO, ul_debug(" writing output"));
+
+	if (write_all(STDOUT_FILENO, obuf, bytes)) {
+		DBG(IO, ul_debug("  writing output *failed*"));
+		return -errno;
+	}
+
+	return 0;
+}
+
+static int schedule_child_write(struct ul_pty *pty, char *buf, size_t bufsz, int final)
+{
+	struct ul_pty_child_buffer *stash;
+
+	if (pty->free_buffers) {
+		stash = pty->free_buffers;
+		pty->free_buffers = stash->next;
+		memset(stash, 0, sizeof(*stash));
+	} else
+		stash = calloc(1, sizeof(*stash));
+	if (!stash)
+		return -1;
+
+	assert(bufsz <= sizeof(stash->buf));
+
+	memcpy(stash->buf, buf, bufsz);
+	stash->size = bufsz;
+	stash->final_input = final ? 1 : 0;
+
+	if (pty->child_buffer_head)
+		pty->child_buffer_tail = pty->child_buffer_tail->next = stash;
+	else
+		pty->child_buffer_head = pty->child_buffer_tail = stash;
+	return 0;
+}
+
+/*
+ * The pty is usually faster than shell, so it's a good idea to wait until
+ * the previous message has been already read by shell from slave before we
+ * write to master. This is necessary especially for EOF situation when we can
+ * send EOF to master before shell is fully initialized, to workaround this
+ * problem we wait until slave is empty. For example:
+ *
+ *   echo "date" | su --pty
+ *
+ * Unfortunately, the child (usually shell) can ignore stdin at all, so we
+ * don't wait forever to avoid dead locks...
+ *
+ * Note that su --pty is primarily designed for interactive sessions as it
+ * maintains master+slave tty stuff within the session. Use pipe to write to
+ * pty and assume non-interactive (tee-like) behavior is NOT well supported.
+ */
+static void drain_child_buffers(struct ul_pty *pty)
+{
+	unsigned int tries = 0;
+	struct pollfd fd = { .fd = pty->slave, .events = POLLIN };
+
+	DBG(IO, ul_debugobj(pty, " waiting for empty slave"));
+	while (poll(&fd, 1, 10) == 1 && tries < 8) {
+		DBG(IO, ul_debugobj(pty, "   slave is not empty"));
+		xusleep(250000);
+		tries++;
+	}
+	if (tries < 8)
+		DBG(IO, ul_debugobj(pty, "   slave is empty now"));
+
+	DBG(IO, ul_debugobj(pty, " sending EOF to master"));
+}
+
+static int flush_child_buffers(struct ul_pty *pty, int *anything)
+{
+	int rc = 0, any = 0;
+
+	while (pty->child_buffer_head) {
+		struct ul_pty_child_buffer *hd = pty->child_buffer_head;
+		ssize_t ret;
+
+		if (hd->final_input)
+			drain_child_buffers(pty);
+
+		DBG(IO, ul_debugobj(hd, " stdin --> master trying %zu bytes", hd->size - hd->cursor));
+
+		ret = write(pty->master, hd->buf + hd->cursor, hd->size - hd->cursor);
+		if (ret == -1) {
+			DBG(IO, ul_debugobj(hd, "   EAGAIN"));
+			if (!(errno == EINTR || errno == EAGAIN))
+				rc = -errno;
+			goto out;
+		}
+		DBG(IO, ul_debugobj(hd, "   wrote %zd", ret));
+		any = 1;
+		hd->cursor += ret;
+
+		if (hd->cursor == hd->size) {
+			pty->child_buffer_head = hd->next;
+			if (!hd->next)
+				pty->child_buffer_tail = NULL;
+
+			hd->next = pty->free_buffers;
+			pty->free_buffers = hd;
+		}
+	}
+out:
+	/* without sync write_output() will write both input &
+	 * shell output that looks like double echoing */
+	if (any)
+		fdatasync(pty->master);
+
+	if (anything)
+		*anything = any;
+	return rc;
+}
+
+void ul_pty_write_eof_to_child(struct ul_pty *pty)
+{
+	char c = DEF_EOF;
+	schedule_child_write(pty, &c, sizeof(char), 1);
+}
+
+static int mainloop_callback(struct ul_pty *pty)
+{
+	int rc;
+
+	if (!pty->callbacks.mainloop)
+		return 0;
+
+	DBG(IO, ul_debugobj(pty, "calling mainloop callback"));
+	rc = pty->callbacks.mainloop(pty->callback_data);
+
+	DBG(IO, ul_debugobj(pty, " callback done [rc=%d]", rc));
+	return rc;
+}
+
+static int handle_io(struct ul_pty *pty, int fd, int *eof)
+{
+	char buf[BUFSIZ];
+	ssize_t bytes;
+	int rc = 0;
+	sigset_t set;
+
+	DBG(IO, ul_debugobj(pty, " handle I/O on fd=%d", fd));
+	*eof = 0;
+
+	sigemptyset(&set);
+	sigaddset(&set, SIGTTIN);
+	sigprocmask(SIG_UNBLOCK, &set, NULL);
+	/* read from active FD */
+	bytes = read(fd, buf, sizeof(buf));
+	sigprocmask(SIG_BLOCK, &set, NULL);
+	if (bytes == -1) {
+		if (errno == EAGAIN || errno == EINTR)
+			return 0;
+		return -errno;
+	}
+
+	if (bytes == 0) {
+		*eof = 1;
+		return 0;
+	}
+
+	/* from stdin (user) to command */
+	if (fd == STDIN_FILENO) {
+		DBG(IO, ul_debugobj(pty, " stdin --> master %zd bytes queued", bytes));
+
+		if (schedule_child_write(pty, buf, bytes, 0))
+			return -errno;
+
+	/* from command (master) to stdout */
+	} else if (fd == pty->master) {
+		DBG(IO, ul_debugobj(pty, " master --> stdout %zd bytes", bytes));
+		write_output(buf, bytes);
+	}
+
+	if (pty->callbacks.log_stream_activity)
+		rc = pty->callbacks.log_stream_activity(
+					pty->callback_data, fd, buf, bytes);
+
+	return rc;
+}
+
+void ul_pty_wait_for_child(struct ul_pty *pty)
+{
+	int status;
+	pid_t pid;
+	int options = 0;
+
+	if (pty->child == (pid_t) -1)
+		return;
+
+	DBG(SIG, ul_debug("waiting for child [child=%d]", (int) pty->child));
+
+	if (ul_pty_is_running(pty)) {
+		/* wait for specific child */
+		options = WNOHANG;
+		for (;;) {
+			pid = waitpid(pty->child, &status, options);
+			DBG(SIG, ul_debug(" waitpid done [rc=%d]", (int) pid));
+			if (pid != (pid_t) - 1) {
+				if (pty->callbacks.child_die)
+					pty->callbacks.child_die(
+							pty->callback_data,
+							pty->child, status);
+				ul_pty_set_child(pty, (pid_t) -1);
+			} else
+				break;
+		}
+	} else {
+		/* final wait */
+		while ((pid = waitpid(-1, &status, options)) > 0) {
+			DBG(SIG, ul_debug(" waitpid done [rc=%d]", (int) pid));
+			if (pid == pty->child) {
+				if (pty->callbacks.child_die)
+					pty->callbacks.child_die(
+							pty->callback_data,
+							pty->child, status);
+				ul_pty_set_child(pty, (pid_t) -1);
+			}
+		}
+	}
+}
+
+static int handle_signal(struct ul_pty *pty, int fd)
+{
+	struct signalfd_siginfo info;
+	ssize_t bytes;
+	int rc = 0;
+
+	DBG(SIG, ul_debugobj(pty, " handle signal on fd=%d", fd));
+
+	bytes = read(fd, &info, sizeof(info));
+	if (bytes != sizeof(info)) {
+		if (bytes < 0 && (errno == EAGAIN || errno == EINTR))
+			return 0;
+		return -errno;
+	}
+
+	switch (info.ssi_signo) {
+	case SIGCHLD:
+		DBG(SIG, ul_debugobj(pty, " get signal SIGCHLD"));
+
+		if (info.ssi_code == CLD_EXITED
+		    || info.ssi_code == CLD_KILLED
+		    || info.ssi_code == CLD_DUMPED) {
+
+			if (pty->callbacks.child_wait)
+				pty->callbacks.child_wait(pty->callback_data,
+							  pty->child);
+			else
+				ul_pty_wait_for_child(pty);
+
+		} else if (info.ssi_status == SIGSTOP && pty->child > 0) {
+			pty->callbacks.child_sigstop(pty->callback_data,
+						     pty->child);
+		}
+
+		if (pty->child <= 0) {
+			DBG(SIG, ul_debugobj(pty, " no child, setting leaving timeout"));
+			pty->poll_timeout = 10;
+			timerclear(&pty->next_callback_time);
+		}
+		return 0;
+	case SIGWINCH:
+		DBG(SIG, ul_debugobj(pty, " get signal SIGWINCH"));
+		if (pty->isterm) {
+			ioctl(STDIN_FILENO, TIOCGWINSZ, (char *)&pty->win);
+			ioctl(pty->slave, TIOCSWINSZ, (char *)&pty->win);
+
+			if (pty->callbacks.log_signal)
+				rc = pty->callbacks.log_signal(pty->callback_data,
+							&info, (void *) &pty->win);
+		}
+		break;
+	case SIGTERM:
+		/* fallthrough */
+	case SIGINT:
+		/* fallthrough */
+	case SIGQUIT:
+		DBG(SIG, ul_debugobj(pty, " get signal SIG{TERM,INT,QUIT}"));
+		pty->delivered_signal = info.ssi_signo;
+                /* Child termination is going to generate SIGCHLD (see above) */
+		if (pty->child > 0)
+	                kill(pty->child, SIGTERM);
+
+		if (pty->callbacks.log_signal)
+			rc = pty->callbacks.log_signal(pty->callback_data,
+					&info, (void *) &pty->win);
+		break;
+	case SIGUSR1:
+		DBG(SIG, ul_debugobj(pty, " get signal SIGUSR1"));
+		if (pty->callbacks.flush_logs)
+			rc = pty->callbacks.flush_logs(pty->callback_data);
+		break;
+	default:
+		abort();
+	}
+
+	return rc;
+}
+
+/* loop in parent */
+int ul_pty_proxy_master(struct ul_pty *pty)
+{
+	int rc = 0, ret, eof = 0;
+	enum {
+		POLLFD_SIGNAL = 0,
+		POLLFD_MASTER,
+		POLLFD_STDIN
+
+	};
+	struct pollfd pfd[] = {
+		[POLLFD_SIGNAL] = { .fd = -1,		.events = POLLIN | POLLERR | POLLHUP },
+		[POLLFD_MASTER] = { .fd = pty->master,  .events = POLLIN | POLLERR | POLLHUP },
+		[POLLFD_STDIN]	= { .fd = STDIN_FILENO, .events = POLLIN | POLLERR | POLLHUP }
+	};
+
+	/* We use signalfd, and standard signals by handlers are completely blocked */
+	assert(pty->sigfd >= 0);
+
+	pfd[POLLFD_SIGNAL].fd = pty->sigfd;
+	pty->poll_timeout = -1;
+
+	while (!pty->delivered_signal) {
+		size_t i;
+		int errsv, timeout;
+
+		DBG(IO, ul_debugobj(pty, "--poll() loop--"));
+
+		/* note, callback usually updates @next_callback_time */
+		if (timerisset(&pty->next_callback_time)) {
+			struct timeval now;
+
+			DBG(IO, ul_debugobj(pty, " callback requested"));
+			gettime_monotonic(&now);
+			if (timercmp(&now, &pty->next_callback_time, >)) {
+				rc = mainloop_callback(pty);
+				if (rc)
+					break;
+			}
+		}
+
+		/* set timeout */
+		if (timerisset(&pty->next_callback_time)) {
+			struct timeval now, rest;
+
+			gettime_monotonic(&now);
+			timersub(&pty->next_callback_time, &now, &rest);
+			timeout = (rest.tv_sec * 1000) +  (rest.tv_usec / 1000);
+		} else
+			timeout = pty->poll_timeout;
+
+		/* use POLLOUT (aka "writing is now possible") if data queued */
+		if (pty->child_buffer_head)
+			pfd[POLLFD_MASTER].events |= POLLOUT;
+		else
+			pfd[POLLFD_MASTER].events &= ~POLLOUT;
+
+		/* wait for input, signal or timeout */
+		DBG(IO, ul_debugobj(pty, "calling poll() [timeout=%dms]", timeout));
+		ret = poll(pfd, ARRAY_SIZE(pfd), timeout);
+
+		errsv = errno;
+		DBG(IO, ul_debugobj(pty, "poll() rc=%d", ret));
+
+		/* error */
+		if (ret < 0) {
+			if (errsv == EAGAIN)
+				continue;
+			rc = -errno;
+			break;
+		}
+
+		/* timeout */
+		if (ret == 0) {
+			if (timerisset(&pty->next_callback_time)) {
+				rc = mainloop_callback(pty);
+				if (rc == 0)
+					continue;
+			} else {
+				rc = 0;
+			}
+
+			DBG(IO, ul_debugobj(pty, "leaving poll() loop [timeout=%d, rc=%d]", timeout, rc));
+			break;
+		}
+		/* event */
+		for (i = 0; i < ARRAY_SIZE(pfd); i++) {
+			if (pfd[i].revents == 0)
+				continue;
+
+			DBG(IO, ul_debugobj(pty, " active pfd[%s].fd=%d %s %s %s %s %s",
+						i == POLLFD_STDIN  ? "stdin" :
+						i == POLLFD_MASTER ? "master" :
+						i == POLLFD_SIGNAL ? "signal" : "???",
+						pfd[i].fd,
+						pfd[i].revents & POLLIN  ? "POLLIN" : "",
+						pfd[i].revents & POLLOUT ? "POLLOUT" : "",
+						pfd[i].revents & POLLHUP ? "POLLHUP" : "",
+						pfd[i].revents & POLLERR ? "POLLERR" : "",
+						pfd[i].revents & POLLNVAL ? "POLLNVAL" : ""));
+
+			if (i == POLLFD_SIGNAL)
+				rc = handle_signal(pty, pfd[i].fd);
+			else {
+				if (pfd[i].revents & POLLIN)
+					rc = handle_io(pty, pfd[i].fd, &eof); /* data */
+				if (pfd[i].revents & POLLOUT) /* i == POLLFD_MASTER */
+					rc = flush_child_buffers(pty, NULL);
+			}
+
+			if (rc) {
+				int anything = 1;
+
+				ul_pty_write_eof_to_child(pty);
+				for (anything = 1; anything;)
+					flush_child_buffers(pty, &anything);
+				break;
+			}
+
+			if (i == POLLFD_SIGNAL)
+				continue;
+
+			/* EOF maybe detected in two ways; they are as follows:
+			 *	A) poll() return POLLHUP event after close()
+			 *	B) read() returns 0 (no data)
+			 *
+			 * POLLNVAL means that fd is closed.
+			 */
+			if ((pfd[i].revents & POLLHUP) || (pfd[i].revents & POLLNVAL) || eof) {
+				DBG(IO, ul_debugobj(pty, " ignore FD"));
+				if (i == POLLFD_STDIN) {
+					pfd[i].fd = -1;
+					ul_pty_write_eof_to_child(pty);
+				} else /* i == POLLFD_MASTER */
+					pfd[i].revents &= ~POLLIN;
+			}
+		}
+		if (rc)
+			break;
+	}
+
+	if (rc && pty->child && pty->child != (pid_t) -1 && !pty->delivered_signal) {
+		kill(pty->child, SIGTERM);
+		sleep(2);
+		kill(pty->child, SIGKILL);
+	}
+
+	pty_signals_cleanup(pty);
+
+	DBG(IO, ul_debug("poll() done [signal=%d, rc=%d]", pty->delivered_signal, rc));
+	return rc;
+}
+
+#ifdef TEST_PROGRAM_PTY
+/*
+ * $ make test_pty
+ * $ ./test_pty
+ *
+ * ... and see for example tty(1) or "ps afu"
+ */
+static void child_sigstop(void *data __attribute__((__unused__)), pid_t child)
+{
+	kill(getpid(), SIGSTOP);
+	kill(child, SIGCONT);
+}
+
+int main(int argc, char *argv[])
+{
+	struct ul_pty_callbacks *cb;
+	const char *shell, *command = NULL, *shname = NULL;
+	int caught_signal = 0;
+	pid_t child;
+	struct ul_pty *pty;
+
+	shell = getenv("SHELL");
+	if (shell == NULL)
+		shell = _PATH_BSHELL;
+	if (argc == 2)
+		command = argv[1];
+
+	ul_pty_init_debug(0);
+
+	pty = ul_new_pty(isatty(STDIN_FILENO));
+	if (!pty)
+		err(EXIT_FAILURE, "failed to allocate PTY handler");
+
+	cb = ul_pty_get_callbacks(pty);
+	cb->child_sigstop = child_sigstop;
+
+	if (ul_pty_setup(pty))
+		err(EXIT_FAILURE, "failed to create pseudo-terminal");
+	if (ul_pty_signals_setup(pty))
+		err(EXIT_FAILURE, "failed to initialize signals handler");
+
+	fflush(stdout);			/* ??? */
+
+	switch ((int) (child = fork())) {
+	case -1: /* error */
+		ul_pty_cleanup(pty);
+		err(EXIT_FAILURE, "cannot create child process");
+		break;
+
+	case 0: /* child */
+		ul_pty_init_slave(pty);
+
+		signal(SIGTERM, SIG_DFL); /* because /etc/csh.login */
+
+		shname = strrchr(shell, '/');
+		shname = shname ? shname + 1 : shell;
+
+		if (command)
+			execl(shell, shname, "-c", command, (char *)NULL);
+		else
+			execl(shell, shname, "-i", (char *)NULL);
+		err(EXIT_FAILURE, "failed to execute %s", shell);
+		break;
+
+	default:
+		break;
+	}
+
+	/* parent */
+	ul_pty_set_child(pty, child);
+
+	/* this is the main loop */
+	ul_pty_proxy_master(pty);
+
+	/* all done; cleanup and kill */
+	caught_signal = ul_pty_get_delivered_signal(pty);
+
+	if (!caught_signal && ul_pty_get_child(pty) != (pid_t)-1)
+		ul_pty_wait_for_child(pty);	/* final wait */
+
+	if (caught_signal && ul_pty_get_child(pty) != (pid_t)-1) {
+		fprintf(stderr, "\nSession terminated, killing shell...");
+		kill(child, SIGTERM);
+		sleep(2);
+		kill(child, SIGKILL);
+		fprintf(stderr, " ...killed.\n");
+	}
+
+	ul_pty_cleanup(pty);
+	ul_free_pty(pty);
+	return EXIT_SUCCESS;
+}
+
+#endif /* TEST_PROGRAM */
+
diff --git a/lib/pwdutils.c b/lib/pwdutils.c
new file mode 100644
index 0000000..1c1f13e
--- /dev/null
+++ b/lib/pwdutils.c
@@ -0,0 +1,158 @@
+/*
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ */
+#include <stdlib.h>
+#include <assert.h>
+
+#include "c.h"
+#include "pwdutils.h"
+#include "xalloc.h"
+
+/* Returns allocated passwd and allocated pwdbuf to store passwd strings
+ * fields. In case of error returns NULL and set errno, for unknown user set
+ * errno to EINVAL
+ */
+struct passwd *xgetpwnam(const char *username, char **pwdbuf)
+{
+	struct passwd *pwd = NULL, *res = NULL;
+	int rc;
+
+	assert(pwdbuf);
+	assert(username);
+
+	*pwdbuf = xmalloc(UL_GETPW_BUFSIZ);
+	pwd = xcalloc(1, sizeof(struct passwd));
+
+	errno = 0;
+	rc = getpwnam_r(username, pwd, *pwdbuf, UL_GETPW_BUFSIZ, &res);
+	if (rc != 0) {
+		errno = rc;
+		goto failed;
+	}
+	if (!res) {
+		errno = EINVAL;
+		goto failed;
+	}
+	return pwd;
+failed:
+	free(pwd);
+	free(*pwdbuf);
+	return NULL;
+}
+
+/* Returns allocated group and allocated grpbuf to store group strings
+ * fields. In case of error returns NULL and set errno, for unknown group set
+ * errno to EINVAL
+ */
+struct group *xgetgrnam(const char *groupname, char **grpbuf)
+{
+	struct group *grp = NULL, *res = NULL;
+	int rc;
+
+	assert(grpbuf);
+	assert(groupname);
+
+	*grpbuf = xmalloc(UL_GETPW_BUFSIZ);
+	grp = xcalloc(1, sizeof(struct group));
+
+	errno = 0;
+	rc = getgrnam_r(groupname, grp, *grpbuf, UL_GETPW_BUFSIZ, &res);
+	if (rc != 0) {
+		errno = rc;
+		goto failed;
+	}
+	if (!res) {
+		errno = EINVAL;
+		goto failed;
+	}
+	return grp;
+failed:
+	free(grp);
+	free(*grpbuf);
+	return NULL;
+}
+
+struct passwd *xgetpwuid(uid_t uid, char **pwdbuf)
+{
+	struct passwd *pwd = NULL, *res = NULL;
+	int rc;
+
+	assert(pwdbuf);
+
+	*pwdbuf = xmalloc(UL_GETPW_BUFSIZ);
+	pwd = xcalloc(1, sizeof(struct passwd));
+
+	errno = 0;
+	rc = getpwuid_r(uid, pwd, *pwdbuf, UL_GETPW_BUFSIZ, &res);
+	if (rc != 0) {
+		errno = rc;
+		goto failed;
+	}
+	if (!res) {
+		errno = EINVAL;
+		goto failed;
+	}
+	return pwd;
+failed:
+	free(pwd);
+	free(*pwdbuf);
+	return NULL;
+}
+
+char *xgetlogin(void)
+{
+	struct passwd *pw = NULL;
+	uid_t ruid;
+
+	/* GNU Hurd implementation has an extension where a process can exist in a
+	 * non-conforming environment, and thus be outside the realms of POSIX
+	 * process identifiers; on this platform, getuid() fails with a status of
+	 * (uid_t)(-1) and sets errno if a program is run from a non-conforming
+	 * environment.
+	 *
+	 * http://austingroupbugs.net/view.php?id=511
+	 *
+	 * The same implementation is useful for other systems, since getlogin(3)
+	 * shouldn't be used as actual identification.
+	 */
+	errno = 0;
+	ruid = getuid();
+
+	if (errno == 0)
+		pw = getpwuid(ruid);
+	if (pw && pw->pw_name && *pw->pw_name)
+		return xstrdup(pw->pw_name);
+
+	return NULL;
+}
+
+#ifdef TEST_PROGRAM
+int main(int argc, char *argv[])
+{
+	char *buf = NULL;
+	struct passwd *pwd = NULL;
+
+	if (argc != 2) {
+		fprintf(stderr, "usage: %s <username>\n", argv[0]);
+		return EXIT_FAILURE;
+	}
+
+	pwd = xgetpwnam(argv[1], &buf);
+	if (!pwd)
+		err(EXIT_FAILURE, "failed to get %s pwd entry", argv[1]);
+
+	printf("Username: %s\n", pwd->pw_name);
+	printf("UID:      %d\n", pwd->pw_uid);
+	printf("HOME:     %s\n", pwd->pw_dir);
+	printf("GECO:     %s\n", pwd->pw_gecos);
+
+	free(pwd);
+	free(buf);
+
+	printf("Current:  %s\n", (buf = xgetlogin()));
+	free(buf);
+
+	return EXIT_SUCCESS;
+}
+#endif /* TEST_PROGRAM */
diff --git a/lib/randutils.c b/lib/randutils.c
new file mode 100644
index 0000000..15c2f78
--- /dev/null
+++ b/lib/randutils.c
@@ -0,0 +1,240 @@
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * General purpose random utilities. Based on libuuid code.
+ *
+ * This code is free software; you can redistribute it and/or modify it under
+ * the terms of the Modified BSD License. The complete text of the license is
+ * available in the Documentation/licenses/COPYING.BSD-3-Clause file.
+ */
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/time.h>
+#ifdef HAVE_SYS_SYSCALL_H
+#include <sys/syscall.h>
+#endif
+#include "c.h"
+#include "randutils.h"
+#include "nls.h"
+
+#ifdef HAVE_TLS
+#define THREAD_LOCAL static __thread
+#else
+#define THREAD_LOCAL static
+#endif
+
+#ifdef HAVE_GETRANDOM
+# include <sys/random.h>
+#elif defined (__linux__)
+# if !defined(SYS_getrandom) && defined(__NR_getrandom)
+   /* usable kernel-headers, but old glibc-headers */
+#  define SYS_getrandom __NR_getrandom
+# endif
+#endif
+
+#if !defined(HAVE_GETRANDOM) && defined(SYS_getrandom)
+/* libc without function, but we have syscall */
+#define GRND_NONBLOCK 0x01
+#define GRND_RANDOM 0x02
+static int getrandom(void *buf, size_t buflen, unsigned int flags)
+{
+	return (syscall(SYS_getrandom, buf, buflen, flags));
+}
+# define HAVE_GETRANDOM
+#endif
+
+#if defined(__linux__) && defined(__NR_gettid) && defined(HAVE_JRAND48)
+#define DO_JRAND_MIX
+THREAD_LOCAL unsigned short ul_jrand_seed[3];
+#endif
+
+int rand_get_number(int low_n, int high_n)
+{
+	return rand() % (high_n - low_n + 1) + low_n;
+}
+
+static void crank_random(void)
+{
+	int i;
+	struct timeval tv;
+	unsigned int n_pid, n_uid;
+
+	gettimeofday(&tv, NULL);
+	n_pid = getpid();
+	n_uid = getuid();
+	srand((n_pid << 16) ^ n_uid ^ tv.tv_sec ^ tv.tv_usec);
+
+#ifdef DO_JRAND_MIX
+	ul_jrand_seed[0] = getpid() ^ (tv.tv_sec & 0xFFFF);
+	ul_jrand_seed[1] = getppid() ^ (tv.tv_usec & 0xFFFF);
+	ul_jrand_seed[2] = (tv.tv_sec ^ tv.tv_usec) >> 16;
+#endif
+	/* Crank the random number generator a few times */
+	gettimeofday(&tv, NULL);
+	for (i = (tv.tv_sec ^ tv.tv_usec) & 0x1F; i > 0; i--)
+		rand();
+}
+
+int random_get_fd(void)
+{
+	int fd;
+
+	fd = open("/dev/urandom", O_RDONLY | O_CLOEXEC);
+	if (fd == -1)
+		fd = open("/dev/random", O_RDONLY | O_NONBLOCK | O_CLOEXEC);
+	crank_random();
+	return fd;
+}
+
+/*
+ * Generate a stream of random nbytes into buf.
+ * Use /dev/urandom if possible, and if not,
+ * use glibc pseudo-random functions.
+ */
+#define UL_RAND_READ_ATTEMPTS	8
+#define UL_RAND_READ_DELAY	125000	/* microseconds */
+
+/*
+ * Write @nbytes random bytes into @buf.
+ *
+ * Returns 0 for good quality of random bytes or 1 for weak quality.
+ */
+int ul_random_get_bytes(void *buf, size_t nbytes)
+{
+	unsigned char *cp = (unsigned char *)buf;
+	size_t i, n = nbytes;
+	int lose_counter = 0;
+
+#ifdef HAVE_GETRANDOM
+	while (n > 0) {
+		int x;
+
+		errno = 0;
+		x = getrandom(cp, n, GRND_NONBLOCK);
+		if (x > 0) {			/* success */
+		       n -= x;
+		       cp += x;
+		       lose_counter = 0;
+		       errno = 0;
+		} else if (errno == ENOSYS) {	/* kernel without getrandom() */
+			break;
+
+		} else if (errno == EAGAIN && lose_counter < UL_RAND_READ_ATTEMPTS) {
+			xusleep(UL_RAND_READ_DELAY);	/* no entropy, wait and try again */
+			lose_counter++;
+		} else
+			break;
+	}
+
+	if (errno == ENOSYS)
+#endif
+	/*
+	 * We've been built against headers that support getrandom, but the
+	 * running kernel does not.  Fallback to reading from /dev/{u,}random
+	 * as before
+	 */
+	{
+		int fd = random_get_fd();
+
+		lose_counter = 0;
+		if (fd >= 0) {
+			while (n > 0) {
+				ssize_t x = read(fd, cp, n);
+				if (x <= 0) {
+					if (lose_counter++ > UL_RAND_READ_ATTEMPTS)
+						break;
+					xusleep(UL_RAND_READ_DELAY);
+					continue;
+				}
+				n -= x;
+				cp += x;
+				lose_counter = 0;
+			}
+
+			close(fd);
+		}
+	}
+	/*
+	 * We do this all the time, but this is the only source of
+	 * randomness if /dev/random/urandom is out to lunch.
+	 */
+	crank_random();
+	for (cp = buf, i = 0; i < nbytes; i++)
+		*cp++ ^= (rand() >> 7) & 0xFF;
+
+#ifdef DO_JRAND_MIX
+	{
+		unsigned short tmp_seed[3];
+
+		memcpy(tmp_seed, ul_jrand_seed, sizeof(tmp_seed));
+		ul_jrand_seed[2] = ul_jrand_seed[2] ^ syscall(__NR_gettid);
+		for (cp = buf, i = 0; i < nbytes; i++)
+			*cp++ ^= (jrand48(tmp_seed) >> 7) & 0xFF;
+		memcpy(ul_jrand_seed, tmp_seed,
+		       sizeof(ul_jrand_seed)-sizeof(unsigned short));
+	}
+#endif
+
+	return n != 0;
+}
+
+
+/*
+ * Tell source of randomness.
+ */
+const char *random_tell_source(void)
+{
+#ifdef HAVE_GETRANDOM
+	return _("getrandom() function");
+#else
+	size_t i;
+	static const char *random_sources[] = {
+		"/dev/urandom",
+		"/dev/random"
+	};
+
+	for (i = 0; i < ARRAY_SIZE(random_sources); i++) {
+		if (!access(random_sources[i], R_OK))
+			return random_sources[i];
+	}
+#endif
+	return _("libc pseudo-random functions");
+}
+
+#ifdef TEST_PROGRAM_RANDUTILS
+#include <inttypes.h>
+
+int main(int argc, char *argv[])
+{
+	size_t i, n;
+	int64_t *vp, v;
+	char *buf;
+	size_t bufsz;
+
+	n = argc == 1 ? 16 : atoi(argv[1]);
+
+	printf("Multiple random calls:\n");
+	for (i = 0; i < n; i++) {
+		ul_random_get_bytes(&v, sizeof(v));
+		printf("#%02zu: %25"PRIu64"\n", i, v);
+	}
+
+
+	printf("One random call:\n");
+	bufsz = n * sizeof(*vp);
+	buf = malloc(bufsz);
+	if (!buf)
+		err(EXIT_FAILURE, "failed to allocate buffer");
+
+	ul_random_get_bytes(buf, bufsz);
+	for (i = 0; i < n; i++) {
+		vp = (int64_t *) (buf + (i * sizeof(*vp)));
+		printf("#%02zu: %25"PRIu64"\n", i, *vp);
+	}
+
+	return EXIT_SUCCESS;
+}
+#endif /* TEST_PROGRAM_RANDUTILS */
diff --git a/lib/selinux-utils.c b/lib/selinux-utils.c
new file mode 100644
index 0000000..c0df891
--- /dev/null
+++ b/lib/selinux-utils.c
@@ -0,0 +1,85 @@
+/*
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Written by Karel Zak <kzak@redhat.com> [January 2021]
+ */
+#include <selinux/context.h>
+#include <selinux/selinux.h>
+#include <selinux/label.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <errno.h>
+
+#include "selinux-utils.h"
+
+/* set the SELinux security context used for _creating_ a new file system object
+ *
+ * returns 0 on success,
+ *     or <0 on error
+ */
+int ul_setfscreatecon_from_file(char *orig_file)
+{
+	if (is_selinux_enabled() > 0) {
+		char *scontext = NULL;
+
+		if (getfilecon(orig_file, &scontext) < 0)
+			return -1;
+		if (setfscreatecon(scontext) < 0) {
+			freecon(scontext);
+			return -1;
+		}
+		freecon(scontext);
+	}
+	return 0;
+}
+
+/* returns 1 if user has access to @class and @perm ("passwd", "chfn")
+ *	or 0 on error,
+ *	or 0 if has no access -- in this case sets @user_cxt to user-context
+ */
+int ul_selinux_has_access(const char *classstr, const char *perm, char **user_cxt)
+{
+	char *user;
+	int rc;
+
+	if (user_cxt)
+		*user_cxt = NULL;
+
+	if (getprevcon(&user) != 0)
+		return 0;
+
+	rc = selinux_check_access(user, user, classstr, perm, NULL);
+	if (rc != 0 && user_cxt)
+		*user_cxt = user;
+	else
+		freecon(user);
+
+	return rc == 0 ? 1 : 0;
+}
+
+/* Gets the default context for @path and @st_mode.
+ *
+ * returns 0 on success,
+ *     or <0 on error
+ */
+int ul_selinux_get_default_context(const char *path, int st_mode, char **cxt)
+{
+	struct selabel_handle *hnd;
+	struct selinux_opt options[SELABEL_NOPT] = {};
+	int rc = 0;
+
+	*cxt = NULL;
+
+	hnd = selabel_open(SELABEL_CTX_FILE, options, SELABEL_NOPT);
+	if (!hnd)
+		return -errno;
+
+	if (selabel_lookup(hnd, cxt, path, st_mode) != 0)
+		rc = -errno
+			;
+	selabel_close(hnd);
+
+	return rc;
+}
diff --git a/lib/sha1.c b/lib/sha1.c
new file mode 100644
index 0000000..eedeaa8
--- /dev/null
+++ b/lib/sha1.c
@@ -0,0 +1,256 @@
+/*
+ * SHA-1 in C by Steve Reid <steve@edmweb.com>
+ * 100% Public Domain
+ *
+ * Test Vectors (from FIPS PUB 180-1)
+ * 1) "abc": A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
+ * 2) "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq":  84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
+ * 3) A million repetitions of "a":  34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
+ */
+
+#define UL_SHA1HANDSOFF
+
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+
+#include "sha1.h"
+
+#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
+
+/* blk0() and blk() perform the initial expand. */
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+# define blk0(i) block->l[i]
+#else
+# define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
+    |(rol(block->l[i],8)&0x00FF00FF))
+#endif
+
+#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
+    ^block->l[(i+2)&15]^block->l[i&15],1))
+
+/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
+#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
+#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
+#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
+#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
+#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
+
+/* Hash a single 512-bit block. This is the core of the algorithm. */
+
+void ul_SHA1Transform(uint32_t state[5], const unsigned char buffer[64])
+{
+	uint32_t a, b, c, d, e;
+
+	typedef union {
+		unsigned char c[64];
+		uint32_t l[16];
+	} CHAR64LONG16;
+
+#ifdef UL_SHA1HANDSOFF
+	CHAR64LONG16 block[1];	/* use array to appear as a pointer */
+
+	memcpy(block, buffer, 64);
+#else
+	/* The following had better never be used because it causes the
+	 * pointer-to-const buffer to be cast into a pointer to non-const.
+	 * And the result is written through.  I threw a "const" in, hoping
+	 * this will cause a diagnostic.
+	 */
+	CHAR64LONG16 *block = (const CHAR64LONG16 *)buffer;
+#endif
+	/* Copy context->state[] to working vars */
+	a = state[0];
+	b = state[1];
+	c = state[2];
+	d = state[3];
+	e = state[4];
+	/* 4 rounds of 20 operations each. Loop unrolled. */
+	R0(a, b, c, d, e, 0);
+	R0(e, a, b, c, d, 1);
+	R0(d, e, a, b, c, 2);
+	R0(c, d, e, a, b, 3);
+	R0(b, c, d, e, a, 4);
+	R0(a, b, c, d, e, 5);
+	R0(e, a, b, c, d, 6);
+	R0(d, e, a, b, c, 7);
+	R0(c, d, e, a, b, 8);
+	R0(b, c, d, e, a, 9);
+	R0(a, b, c, d, e, 10);
+	R0(e, a, b, c, d, 11);
+	R0(d, e, a, b, c, 12);
+	R0(c, d, e, a, b, 13);
+	R0(b, c, d, e, a, 14);
+	R0(a, b, c, d, e, 15);
+	R1(e, a, b, c, d, 16);
+	R1(d, e, a, b, c, 17);
+	R1(c, d, e, a, b, 18);
+	R1(b, c, d, e, a, 19);
+	R2(a, b, c, d, e, 20);
+	R2(e, a, b, c, d, 21);
+	R2(d, e, a, b, c, 22);
+	R2(c, d, e, a, b, 23);
+	R2(b, c, d, e, a, 24);
+	R2(a, b, c, d, e, 25);
+	R2(e, a, b, c, d, 26);
+	R2(d, e, a, b, c, 27);
+	R2(c, d, e, a, b, 28);
+	R2(b, c, d, e, a, 29);
+	R2(a, b, c, d, e, 30);
+	R2(e, a, b, c, d, 31);
+	R2(d, e, a, b, c, 32);
+	R2(c, d, e, a, b, 33);
+	R2(b, c, d, e, a, 34);
+	R2(a, b, c, d, e, 35);
+	R2(e, a, b, c, d, 36);
+	R2(d, e, a, b, c, 37);
+	R2(c, d, e, a, b, 38);
+	R2(b, c, d, e, a, 39);
+	R3(a, b, c, d, e, 40);
+	R3(e, a, b, c, d, 41);
+	R3(d, e, a, b, c, 42);
+	R3(c, d, e, a, b, 43);
+	R3(b, c, d, e, a, 44);
+	R3(a, b, c, d, e, 45);
+	R3(e, a, b, c, d, 46);
+	R3(d, e, a, b, c, 47);
+	R3(c, d, e, a, b, 48);
+	R3(b, c, d, e, a, 49);
+	R3(a, b, c, d, e, 50);
+	R3(e, a, b, c, d, 51);
+	R3(d, e, a, b, c, 52);
+	R3(c, d, e, a, b, 53);
+	R3(b, c, d, e, a, 54);
+	R3(a, b, c, d, e, 55);
+	R3(e, a, b, c, d, 56);
+	R3(d, e, a, b, c, 57);
+	R3(c, d, e, a, b, 58);
+	R3(b, c, d, e, a, 59);
+	R4(a, b, c, d, e, 60);
+	R4(e, a, b, c, d, 61);
+	R4(d, e, a, b, c, 62);
+	R4(c, d, e, a, b, 63);
+	R4(b, c, d, e, a, 64);
+	R4(a, b, c, d, e, 65);
+	R4(e, a, b, c, d, 66);
+	R4(d, e, a, b, c, 67);
+	R4(c, d, e, a, b, 68);
+	R4(b, c, d, e, a, 69);
+	R4(a, b, c, d, e, 70);
+	R4(e, a, b, c, d, 71);
+	R4(d, e, a, b, c, 72);
+	R4(c, d, e, a, b, 73);
+	R4(b, c, d, e, a, 74);
+	R4(a, b, c, d, e, 75);
+	R4(e, a, b, c, d, 76);
+	R4(d, e, a, b, c, 77);
+	R4(c, d, e, a, b, 78);
+	R4(b, c, d, e, a, 79);
+	/* Add the working vars back into context.state[] */
+	state[0] += a;
+	state[1] += b;
+	state[2] += c;
+	state[3] += d;
+	state[4] += e;
+	/* Wipe variables */
+	a = b = c = d = e = 0;
+#ifdef UL_SHA1HANDSOFF
+	memset(block, '\0', sizeof(block));
+#endif
+}
+
+/* SHA1Init - Initialize new context */
+
+void ul_SHA1Init(UL_SHA1_CTX *context)
+{
+	/* SHA1 initialization constants */
+	context->state[0] = 0x67452301;
+	context->state[1] = 0xEFCDAB89;
+	context->state[2] = 0x98BADCFE;
+	context->state[3] = 0x10325476;
+	context->state[4] = 0xC3D2E1F0;
+	context->count[0] = context->count[1] = 0;
+}
+
+/* Run your data through this. */
+
+void ul_SHA1Update(UL_SHA1_CTX *context, const unsigned char *data, uint32_t len)
+{
+	uint32_t i;
+
+	uint32_t j;
+
+	j = context->count[0];
+	if ((context->count[0] += len << 3) < j)
+		context->count[1]++;
+	context->count[1] += (len >> 29);
+	j = (j >> 3) & 63;
+	if ((j + len) > 63) {
+		memcpy(&context->buffer[j], data, (i = 64 - j));
+		ul_SHA1Transform(context->state, context->buffer);
+		for (; i + 63 < len; i += 64) {
+			ul_SHA1Transform(context->state, &data[i]);
+		}
+		j = 0;
+	} else
+		i = 0;
+	memcpy(&context->buffer[j], &data[i], len - i);
+}
+
+/* Add padding and return the message digest. */
+
+void ul_SHA1Final(unsigned char digest[20], UL_SHA1_CTX *context)
+{
+	unsigned i;
+
+	unsigned char finalcount[8];
+
+	unsigned char c;
+
+#if 0				/* untested "improvement" by DHR */
+	/* Convert context->count to a sequence of bytes
+	 * in finalcount.  Second element first, but
+	 * big-endian order within element.
+	 * But we do it all backwards.
+	 */
+	unsigned char *fcp = &finalcount[8];
+
+	for (i = 0; i < 2; i++) {
+		uint32_t t = context->count[i];
+
+		int j;
+
+		for (j = 0; j < 4; t >>= 8, j++)
+			*--fcp = (unsigned char)t}
+#else
+	for (i = 0; i < 8; i++) {
+		finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)] >> ((3 - (i & 3)) * 8)) & 255);	/* Endian independent */
+	}
+#endif
+	c = 0200;
+	ul_SHA1Update(context, &c, 1);
+	while ((context->count[0] & 504) != 448) {
+		c = 0000;
+		ul_SHA1Update(context, &c, 1);
+	}
+	ul_SHA1Update(context, finalcount, 8);	/* Should cause a SHA1Transform() */
+	for (i = 0; i < 20; i++) {
+		digest[i] = (unsigned char)
+		    ((context->state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255);
+	}
+	/* Wipe variables */
+	memset(context, '\0', sizeof(*context));
+	memset(&finalcount, '\0', sizeof(finalcount));
+}
+
+void ul_SHA1(char *hash_out, const char *str, unsigned len)
+{
+	UL_SHA1_CTX ctx;
+	unsigned int ii;
+
+	ul_SHA1Init(&ctx);
+	for (ii = 0; ii < len; ii += 1)
+		ul_SHA1Update(&ctx, (const unsigned char *)str + ii, 1);
+	ul_SHA1Final((unsigned char *)hash_out, &ctx);
+	hash_out[20] = '\0';
+}
diff --git a/lib/sha256.c b/lib/sha256.c
new file mode 100644
index 0000000..934303c
--- /dev/null
+++ b/lib/sha256.c
@@ -0,0 +1,163 @@
+/*
+ * public domain sha256 crypt implementation
+ *
+ * original sha crypt design: http://people.redhat.com/drepper/SHA-crypt.txt
+ * in this implementation at least 32bit int is assumed,
+ * key length is limited, the $5$ prefix is mandatory, '\n' and ':' is rejected
+ * in the salt and rounds= setting must contain a valid iteration count,
+ * on error "*" is returned.
+ */
+#include <ctype.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+
+#include "sha256.h"
+
+/* public domain sha256 implementation based on fips180-3 */
+
+struct sha256 {
+	uint64_t len;    /* processed message length */
+	uint32_t h[8];   /* hash state */
+	uint8_t buf[64]; /* message block buffer */
+};
+
+static uint32_t ror(uint32_t n, int k) { return (n >> k) | (n << (32-k)); }
+#define Ch(x,y,z)  (z ^ (x & (y ^ z)))
+#define Maj(x,y,z) ((x & y) | (z & (x | y)))
+#define S0(x)      (ror(x,2) ^ ror(x,13) ^ ror(x,22))
+#define S1(x)      (ror(x,6) ^ ror(x,11) ^ ror(x,25))
+#define R0(x)      (ror(x,7) ^ ror(x,18) ^ (x>>3))
+#define R1(x)      (ror(x,17) ^ ror(x,19) ^ (x>>10))
+
+static const uint32_t K[64] = {
+0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
+0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
+0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
+0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
+0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
+0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
+0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
+};
+
+static void processblock(struct sha256 *s, const uint8_t *buf)
+{
+	uint32_t W[64], t1, t2, a, b, c, d, e, f, g, h;
+	int i;
+
+	for (i = 0; i < 16; i++) {
+		W[i] = (uint32_t)buf[4*i]<<24;
+		W[i] |= (uint32_t)buf[4*i+1]<<16;
+		W[i] |= (uint32_t)buf[4*i+2]<<8;
+		W[i] |= buf[4*i+3];
+	}
+	for (; i < 64; i++)
+		W[i] = R1(W[i-2]) + W[i-7] + R0(W[i-15]) + W[i-16];
+	a = s->h[0];
+	b = s->h[1];
+	c = s->h[2];
+	d = s->h[3];
+	e = s->h[4];
+	f = s->h[5];
+	g = s->h[6];
+	h = s->h[7];
+	for (i = 0; i < 64; i++) {
+		t1 = h + S1(e) + Ch(e,f,g) + K[i] + W[i];
+		t2 = S0(a) + Maj(a,b,c);
+		h = g;
+		g = f;
+		f = e;
+		e = d + t1;
+		d = c;
+		c = b;
+		b = a;
+		a = t1 + t2;
+	}
+	s->h[0] += a;
+	s->h[1] += b;
+	s->h[2] += c;
+	s->h[3] += d;
+	s->h[4] += e;
+	s->h[5] += f;
+	s->h[6] += g;
+	s->h[7] += h;
+}
+
+static void pad(struct sha256 *s)
+{
+	unsigned r = s->len % 64;
+
+	s->buf[r++] = 0x80;
+	if (r > 56) {
+		memset(s->buf + r, 0, 64 - r);
+		r = 0;
+		processblock(s, s->buf);
+	}
+	memset(s->buf + r, 0, 56 - r);
+	s->len *= 8;
+	s->buf[56] = s->len >> 56;
+	s->buf[57] = s->len >> 48;
+	s->buf[58] = s->len >> 40;
+	s->buf[59] = s->len >> 32;
+	s->buf[60] = s->len >> 24;
+	s->buf[61] = s->len >> 16;
+	s->buf[62] = s->len >> 8;
+	s->buf[63] = s->len;
+	processblock(s, s->buf);
+}
+
+static void sha256_init(struct sha256 *s)
+{
+	s->len = 0;
+	s->h[0] = 0x6a09e667;
+	s->h[1] = 0xbb67ae85;
+	s->h[2] = 0x3c6ef372;
+	s->h[3] = 0xa54ff53a;
+	s->h[4] = 0x510e527f;
+	s->h[5] = 0x9b05688c;
+	s->h[6] = 0x1f83d9ab;
+	s->h[7] = 0x5be0cd19;
+}
+
+static void sha256_sum(struct sha256 *s, uint8_t *md)
+{
+	int i;
+
+	pad(s);
+	for (i = 0; i < 8; i++) {
+		md[4*i] = s->h[i] >> 24;
+		md[4*i+1] = s->h[i] >> 16;
+		md[4*i+2] = s->h[i] >> 8;
+		md[4*i+3] = s->h[i];
+	}
+}
+
+static void sha256_update(struct sha256 *s, const void *m, unsigned long len)
+{
+	const uint8_t *p = m;
+	unsigned r = s->len % 64;
+
+	s->len += len;
+	if (r) {
+		if (len < 64 - r) {
+			memcpy(s->buf + r, p, len);
+			return;
+		}
+		memcpy(s->buf + r, p, 64 - r);
+		len -= 64 - r;
+		p += 64 - r;
+		processblock(s, s->buf);
+	}
+	for (; len >= 64; len -= 64, p += 64)
+		processblock(s, p);
+	memcpy(s->buf, p, len);
+}
+
+void ul_SHA256(unsigned char hash_out[UL_SHA256LENGTH], const unsigned char *str, size_t len) {
+	struct sha256 state = {};
+	sha256_init(&state);
+	sha256_update(&state, str, len);
+	sha256_sum(&state, hash_out);
+}
diff --git a/lib/shells.c b/lib/shells.c
new file mode 100644
index 0000000..6693ab0
--- /dev/null
+++ b/lib/shells.c
@@ -0,0 +1,74 @@
+/*
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#include <sys/syslog.h>
+#if defined (HAVE_LIBECONF) && defined (USE_VENDORDIR)
+#include <libeconf.h>
+#endif
+
+#include "closestream.h"
+#include "shells.h"
+
+/*
+ *  is_known_shell() -- if the given shell appears in /etc/shells
+ *  or vendor defined files.
+ *  Return 1 if found and return 0 if not found.
+ */
+extern int is_known_shell(const char *shell_name)
+{
+	int ret = 0;
+
+#if defined (HAVE_LIBECONF) && defined (USE_VENDORDIR)
+	size_t size = 0;
+	econf_err error;
+	char **keys;
+	econf_file *key_file;
+
+	error = econf_readDirs(&key_file,
+			       _PATH_VENDORDIR,
+			       "/etc",
+			       "shells",
+			       NULL,
+			       "", /* key only */
+			       "#" /* comment */);
+	if (error) {
+		syslog(LOG_ALERT,
+		       _("Cannot parse shells files: %s"),
+		       econf_errString(error));
+		exit(EXIT_FAILURE);
+	}
+
+	error = econf_getKeys(key_file, NULL, &size, &keys);
+	if (error) {
+		syslog(LOG_ALERT,
+		       _("Cannot evaluate entries in shells files: %s"),
+		       econf_errString(error));
+		econf_free (key_file);
+		exit(EXIT_FAILURE);
+	}
+
+	for (size_t i = 0; i < size; i++) {
+		if (strcmp (keys[i], shell_name) == 0) {
+			ret = 1;
+			break;
+		}
+	}
+	econf_free (key_file);	
+#else
+	char *s;
+
+	if (!shell_name)
+		return 0;
+
+	setusershell();
+	while ((s = getusershell())) {
+		if (*s != '#' && strcmp(shell_name, s) == 0) {
+			ret = 1;
+			break;
+		}
+	}
+	endusershell();
+#endif
+	return ret;
+}
+
diff --git a/lib/signames.c b/lib/signames.c
new file mode 100644
index 0000000..d0d2bff
--- /dev/null
+++ b/lib/signames.c
@@ -0,0 +1,174 @@
+/*
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+
+ * Written by:
+ *  Sami Kerola <kerolasa@iki.fi>
+ *  Karel Zak <kzak@redhat.com>
+ *  Niklas Hambüchen <mail@nh2.me>
+ */
+
+#include <ctype.h>		/* for isdigit() */
+#include <signal.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+#include "c.h"
+#include "cctype.h"
+#include "strutils.h"
+#include "signames.h"
+
+static const struct ul_signal_name {
+	const char *name;
+	int val;
+} ul_signames[] = {
+	/* POSIX signals */
+	{ "HUP",	SIGHUP },	/* 1 */
+	{ "INT",	SIGINT },	/* 2 */
+	{ "QUIT",	SIGQUIT },	/* 3 */
+	{ "ILL",	SIGILL },	/* 4 */
+#ifdef SIGTRAP
+	{ "TRAP",	SIGTRAP },	/* 5 */
+#endif
+	{ "ABRT",	SIGABRT },	/* 6 */
+#ifdef SIGIOT
+	{ "IOT",	SIGIOT },	/* 6, same as SIGABRT */
+#endif
+#ifdef SIGEMT
+	{ "EMT",	SIGEMT },	/* 7 (mips,alpha,sparc*) */
+#endif
+#ifdef SIGBUS
+	{ "BUS",	SIGBUS },	/* 7 (arm,i386,m68k,ppc), 10 (mips,alpha,sparc*) */
+#endif
+	{ "FPE",	SIGFPE },	/* 8 */
+	{ "KILL",	SIGKILL },	/* 9 */
+	{ "USR1",	SIGUSR1 },	/* 10 (arm,i386,m68k,ppc), 30 (alpha,sparc*), 16 (mips) */
+	{ "SEGV",	SIGSEGV },	/* 11 */
+	{ "USR2",	SIGUSR2 },	/* 12 (arm,i386,m68k,ppc), 31 (alpha,sparc*), 17 (mips) */
+	{ "PIPE",	SIGPIPE },	/* 13 */
+	{ "ALRM",	SIGALRM },	/* 14 */
+	{ "TERM",	SIGTERM },	/* 15 */
+#ifdef SIGSTKFLT
+	{ "STKFLT",	SIGSTKFLT },	/* 16 (arm,i386,m68k,ppc) */
+#endif
+	{ "CHLD",	SIGCHLD },	/* 17 (arm,i386,m68k,ppc), 20 (alpha,sparc*), 18 (mips) */
+#ifdef SIGCLD
+	{ "CLD",	SIGCLD },	/* same as SIGCHLD (mips) */
+#endif
+	{ "CONT",	SIGCONT },	/* 18 (arm,i386,m68k,ppc), 19 (alpha,sparc*), 25 (mips) */
+	{ "STOP",	SIGSTOP },	/* 19 (arm,i386,m68k,ppc), 17 (alpha,sparc*), 23 (mips) */
+	{ "TSTP",	SIGTSTP },	/* 20 (arm,i386,m68k,ppc), 18 (alpha,sparc*), 24 (mips) */
+	{ "TTIN",	SIGTTIN },	/* 21 (arm,i386,m68k,ppc,alpha,sparc*), 26 (mips) */
+	{ "TTOU",	SIGTTOU },	/* 22 (arm,i386,m68k,ppc,alpha,sparc*), 27 (mips) */
+#ifdef SIGURG
+	{ "URG",	SIGURG },	/* 23 (arm,i386,m68k,ppc), 16 (alpha,sparc*), 21 (mips) */
+#endif
+#ifdef SIGXCPU
+	{ "XCPU",	SIGXCPU },	/* 24 (arm,i386,m68k,ppc,alpha,sparc*), 30 (mips) */
+#endif
+#ifdef SIGXFSZ
+	{ "XFSZ",	SIGXFSZ },	/* 25 (arm,i386,m68k,ppc,alpha,sparc*), 31 (mips) */
+#endif
+#ifdef SIGVTALRM
+	{ "VTALRM",	SIGVTALRM },	/* 26 (arm,i386,m68k,ppc,alpha,sparc*), 28 (mips) */
+#endif
+#ifdef SIGPROF
+	{ "PROF",	SIGPROF },	/* 27 (arm,i386,m68k,ppc,alpha,sparc*), 29 (mips) */
+#endif
+#ifdef SIGWINCH
+	{ "WINCH",	SIGWINCH },	/* 28 (arm,i386,m68k,ppc,alpha,sparc*), 20 (mips) */
+#endif
+#ifdef SIGIO
+	{ "IO",		SIGIO },	/* 29 (arm,i386,m68k,ppc), 23 (alpha,sparc*), 22 (mips) */
+#endif
+#ifdef SIGPOLL
+	{ "POLL",	SIGPOLL },	/* same as SIGIO */
+#endif
+#ifdef SIGINFO
+	{ "INFO",	SIGINFO },	/* 29 (alpha) */
+#endif
+#ifdef SIGLOST
+	{ "LOST",	SIGLOST },	/* 29 (arm,i386,m68k,ppc,sparc*) */
+#endif
+#ifdef SIGPWR
+	{ "PWR",	SIGPWR },	/* 30 (arm,i386,m68k,ppc), 29 (alpha,sparc*), 19 (mips) */
+#endif
+#ifdef SIGUNUSED
+	{ "UNUSED",	SIGUNUSED },	/* 31 (arm,i386,m68k,ppc) */
+#endif
+#ifdef SIGSYS
+	{ "SYS",	SIGSYS },	/* 31 (mips,alpha,sparc*) */
+#endif
+};
+
+#ifdef SIGRTMIN
+static int rtsig_to_signum(const char *sig)
+{
+	int num, maxi = 0;
+	char *ep = NULL;
+
+	if (c_strncasecmp(sig, "min+", 4) == 0)
+		sig += 4;
+	else if (c_strncasecmp(sig, "max-", 4) == 0) {
+		sig += 4;
+		maxi = 1;
+	}
+	if (!isdigit(*sig))
+		return -1;
+	errno = 0;
+	num = strtol(sig, &ep, 10);
+	if (!ep || sig == ep || errno || num < 0)
+		return -1;
+	num = maxi ? SIGRTMAX - num : SIGRTMIN + num;
+	if (num < SIGRTMIN || SIGRTMAX < num)
+		return -1;
+	return num;
+}
+#endif
+
+int signame_to_signum(const char *sig)
+{
+	size_t n;
+
+	if (!c_strncasecmp(sig, "sig", 3))
+		sig += 3;
+#ifdef SIGRTMIN
+	/* RT signals */
+	if (!c_strncasecmp(sig, "rt", 2))
+		return rtsig_to_signum(sig + 2);
+#endif
+	/* Normal signals */
+	for (n = 0; n < ARRAY_SIZE(ul_signames); n++) {
+		if (!c_strcasecmp(ul_signames[n].name, sig))
+			return ul_signames[n].val;
+	}
+	return -1;
+}
+
+const char *signum_to_signame(int signum)
+{
+	size_t n;
+
+	for (n = 0; n < ARRAY_SIZE(ul_signames); n++) {
+		if (ul_signames[n].val == signum) {
+			return ul_signames[n].name;
+		}
+	}
+
+	return NULL;
+}
+
+int get_signame_by_idx(size_t idx, const char **signame, int *signum)
+{
+	if (idx >= ARRAY_SIZE(ul_signames))
+		return -1;
+
+	if (signame)
+		*signame = ul_signames[idx].name;
+	if (signum)
+		*signum = ul_signames[idx].val;
+	return 0;
+
+}
+
diff --git a/lib/strutils.c b/lib/strutils.c
new file mode 100644
index 0000000..6229a6e
--- /dev/null
+++ b/lib/strutils.c
@@ -0,0 +1,1403 @@
+/*
+ * Copyright (C) 2010 Karel Zak <kzak@redhat.com>
+ * Copyright (C) 2010 Davidlohr Bueso <dave@gnu.org>
+ *
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <ctype.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <strings.h>
+#include <assert.h>
+
+#include "c.h"
+#include "nls.h"
+#include "strutils.h"
+#include "bitops.h"
+#include "pathnames.h"
+
+static int STRTOXX_EXIT_CODE = EXIT_FAILURE;
+
+void strutils_set_exitcode(int ex) {
+	STRTOXX_EXIT_CODE = ex;
+}
+
+static int do_scale_by_power (uintmax_t *x, int base, int power)
+{
+	while (power--) {
+		if (UINTMAX_MAX / base < *x)
+			return -ERANGE;
+		*x *= base;
+	}
+	return 0;
+}
+
+/*
+ * strtosize() - convert string to size (uintmax_t).
+ *
+ * Supported suffixes:
+ *
+ * XiB or X for 2^N
+ *     where X = {K,M,G,T,P,E,Z,Y}
+ *        or X = {k,m,g,t,p,e}  (undocumented for backward compatibility only)
+ * for example:
+ *		10KiB	= 10240
+ *		10K	= 10240
+ *
+ * XB for 10^N
+ *     where X = {K,M,G,T,P,E,Z,Y}
+ * for example:
+ *		10KB	= 10000
+ *
+ * The optional 'power' variable returns number associated with used suffix
+ * {K,M,G,T,P,E,Z,Y}  = {1,2,3,4,5,6,7,8}.
+ *
+ * The function also supports decimal point, for example:
+ *              0.5MB   = 500000
+ *              0.5MiB  = 512000
+ *
+ * Note that the function does not accept numbers with '-' (negative sign)
+ * prefix.
+ */
+int parse_size(const char *str, uintmax_t *res, int *power)
+{
+	const char *p;
+	char *end;
+	uintmax_t x, frac = 0;
+	int base = 1024, rc = 0, pwr = 0, frac_zeros = 0;
+
+	static const char *suf  = "KMGTPEZY";
+	static const char *suf2 = "kmgtpezy";
+	const char *sp;
+
+	*res = 0;
+
+	if (!str || !*str) {
+		rc = -EINVAL;
+		goto err;
+	}
+
+	/* Only positive numbers are acceptable
+	 *
+	 * Note that this check is not perfect, it would be better to
+	 * use lconv->negative_sign. But coreutils use the same solution,
+	 * so it's probably good enough...
+	 */
+	p = str;
+	while (isspace((unsigned char) *p))
+		p++;
+	if (*p == '-') {
+		rc = -EINVAL;
+		goto err;
+	}
+
+	errno = 0, end = NULL;
+	x = strtoumax(str, &end, 0);
+
+	if (end == str ||
+	    (errno != 0 && (x == UINTMAX_MAX || x == 0))) {
+		rc = errno ? -errno : -EINVAL;
+		goto err;
+	}
+	if (!end || !*end)
+		goto done;			/* without suffix */
+	p = end;
+
+	/*
+	 * Check size suffixes
+	 */
+check_suffix:
+	if (*(p + 1) == 'i' && (*(p + 2) == 'B' || *(p + 2) == 'b') && !*(p + 3))
+		base = 1024;			/* XiB, 2^N */
+	else if ((*(p + 1) == 'B' || *(p + 1) == 'b') && !*(p + 2))
+		base = 1000;			/* XB, 10^N */
+	else if (*(p + 1)) {
+		struct lconv const *l = localeconv();
+		const char *dp = l ? l->decimal_point : NULL;
+		size_t dpsz = dp ? strlen(dp) : 0;
+
+		if (frac == 0 && *p && dp && strncmp(dp, p, dpsz) == 0) {
+			const char *fstr = p + dpsz;
+
+			for (p = fstr; *p == '0'; p++)
+				frac_zeros++;
+			fstr = p;
+			if (isdigit(*fstr)) {
+				errno = 0, end = NULL;
+				frac = strtoumax(fstr, &end, 0);
+				if (end == fstr ||
+				    (errno != 0 && (frac == UINTMAX_MAX || frac == 0))) {
+					rc = errno ? -errno : -EINVAL;
+					goto err;
+				}
+			} else
+				end = (char *) p;
+
+			if (frac && (!end  || !*end)) {
+				rc = -EINVAL;
+				goto err;		/* without suffix, but with frac */
+			}
+			p = end;
+			goto check_suffix;
+		}
+		rc = -EINVAL;
+		goto err;			/* unexpected suffix */
+	}
+
+	sp = strchr(suf, *p);
+	if (sp)
+		pwr = (sp - suf) + 1;
+	else {
+		sp = strchr(suf2, *p);
+		if (sp)
+			pwr = (sp - suf2) + 1;
+		else {
+			rc = -EINVAL;
+			goto err;
+		}
+	}
+
+	rc = do_scale_by_power(&x, base, pwr);
+	if (power)
+		*power = pwr;
+	if (frac && pwr) {
+		int i;
+		uintmax_t frac_div = 10, frac_poz = 1, frac_base = 1;
+
+		/* mega, giga, ... */
+		do_scale_by_power(&frac_base, base, pwr);
+
+		/* maximal divisor for last digit (e.g. for 0.05 is
+		 * frac_div=100, for 0.054 is frac_div=1000, etc.)
+		 *
+		 * Reduce frac if too large.
+		 */
+		while (frac_div < frac) {
+			if (frac_div <= UINTMAX_MAX/10)
+				frac_div *= 10;
+			else
+				frac /= 10;
+		}
+
+		/* 'frac' is without zeros (5 means 0.5 as well as 0.05) */
+		for (i = 0; i < frac_zeros; i++) {
+			if (frac_div <= UINTMAX_MAX/10)
+				frac_div *= 10;
+			else
+				frac /= 10;
+		}
+
+		/*
+		 * Go backwardly from last digit and add to result what the
+		 * digit represents in the frac_base. For example 0.25G
+		 *
+		 *  5 means 1GiB / (100/5)
+		 *  2 means 1GiB / (10/2)
+		 */
+		do {
+			unsigned int seg = frac % 10;		 /* last digit of the frac */
+			uintmax_t seg_div = frac_div / frac_poz; /* what represents the segment 1000, 100, .. */
+
+			frac /= 10;	/* remove last digit from frac */
+			frac_poz *= 10;
+
+			if (seg && seg_div / seg)
+				x += frac_base / (seg_div / seg);
+		} while (frac);
+	}
+done:
+	*res = x;
+err:
+	if (rc < 0)
+		errno = -rc;
+	return rc;
+}
+
+int strtosize(const char *str, uintmax_t *res)
+{
+	return parse_size(str, res, NULL);
+}
+
+int isdigit_strend(const char *str, const char **end)
+{
+	const char *p;
+
+	for (p = str; p && *p && isdigit((unsigned char) *p); p++);
+
+	if (end)
+		*end = p;
+	return p && p > str && !*p;
+}
+
+int isxdigit_strend(const char *str, const char **end)
+{
+	const char *p;
+
+	for (p = str; p && *p && isxdigit((unsigned char) *p); p++);
+
+	if (end)
+		*end = p;
+
+	return p && p > str && !*p;
+}
+
+/*
+ *  parse_switch(argv[i], "on", "off",  "yes", "no",  NULL);
+ */
+int parse_switch(const char *arg, const char *errmesg, ...)
+{
+	const char *a, *b;
+	va_list ap;
+
+	va_start(ap, errmesg);
+	do {
+		a = va_arg(ap, char *);
+		if (!a)
+			break;
+		b = va_arg(ap, char *);
+		if (!b)
+			break;
+
+		if (strcmp(arg, a) == 0) {
+			va_end(ap);
+			return 1;
+		}
+
+		if (strcmp(arg, b) == 0) {
+			va_end(ap);
+			return 0;
+		}
+	} while (1);
+	va_end(ap);
+
+	errx(STRTOXX_EXIT_CODE, "%s: '%s'", errmesg, arg);
+}
+
+#ifndef HAVE_MEMPCPY
+void *mempcpy(void *restrict dest, const void *restrict src, size_t n)
+{
+    return ((char *)memcpy(dest, src, n)) + n;
+}
+#endif
+
+#ifndef HAVE_STRNLEN
+size_t strnlen(const char *s, size_t maxlen)
+{
+        size_t i;
+
+        for (i = 0; i < maxlen; i++) {
+                if (s[i] == '\0')
+                        return i;
+        }
+        return maxlen;
+}
+#endif
+
+#ifndef HAVE_STRNCHR
+char *strnchr(const char *s, size_t maxlen, int c)
+{
+	for (; maxlen-- && *s != '\0'; ++s)
+		if (*s == (char)c)
+			return (char *)s;
+	return NULL;
+}
+#endif
+
+#ifndef HAVE_STRNDUP
+char *strndup(const char *s, size_t n)
+{
+	size_t len = strnlen(s, n);
+	char *new = malloc((len + 1) * sizeof(char));
+	if (!new)
+		return NULL;
+	new[len] = '\0';
+	return (char *) memcpy(new, s, len);
+}
+#endif
+
+/*
+ * convert strings to numbers; returns <0 on error, and 0 on success
+ */
+int ul_strtos64(const char *str, int64_t *num, int base)
+{
+	char *end = NULL;
+
+	if (str == NULL || *str == '\0')
+		return -(errno = EINVAL);
+
+	errno = 0;
+	*num = (int64_t) strtoimax(str, &end, base);
+
+	if (errno != 0)
+		return -errno;
+	if (str == end || (end && *end))
+		return -(errno = EINVAL);
+	return 0;
+}
+
+int ul_strtou64(const char *str, uint64_t *num, int base)
+{
+	char *end = NULL;
+	int64_t tmp;
+
+	if (str == NULL || *str == '\0')
+		return -(errno = EINVAL);
+
+	/* we need to ignore negative numbers, note that for invalid negative
+	 * number strtoimax() returns negative number too, so we do not
+	 * need to check errno here */
+	errno = 0;
+	tmp = (int64_t) strtoimax(str, &end, base);
+	if (tmp < 0)
+		errno = ERANGE;
+	else {
+		errno = 0;
+		*num = strtoumax(str, &end, base);
+	}
+
+	if (errno != 0)
+		return -errno;
+	if (str == end || (end && *end))
+		return -(errno = EINVAL);
+	return 0;
+}
+
+int ul_strtos32(const char *str, int32_t *num, int base)
+{
+	int64_t tmp;
+	int rc;
+
+	rc = ul_strtos64(str, &tmp, base);
+	if (rc == 0 && (tmp < INT32_MIN || tmp > INT32_MAX))
+		rc = -(errno = ERANGE);
+	if (rc == 0)
+		*num = (int32_t) tmp;
+	return rc;
+}
+
+int ul_strtou32(const char *str, uint32_t *num, int base)
+{
+	uint64_t tmp;
+	int rc;
+
+	rc = ul_strtou64(str, &tmp, base);
+	if (rc == 0 && tmp > UINT32_MAX)
+		rc = -(errno = ERANGE);
+	if (rc == 0)
+		*num = (uint32_t) tmp;
+	return rc;
+}
+
+/*
+ * Convert strings to numbers in defined range and print message on error.
+ *
+ * These functions are used when we read input from users (getopt() etc.). It's
+ * better to consolidate the code and keep it all based on 64-bit numbers than
+ * implement it for 32 and 16-bit numbers too.
+ */
+int64_t str2num_or_err(const char *str, int base, const char *errmesg,
+			     int64_t low, int64_t up)
+{
+	int64_t num = 0;
+	int rc;
+
+	rc = ul_strtos64(str, &num, base);
+	if (rc == 0 && ((low && num < low) || (up && num > up)))
+		rc = -(errno = ERANGE);
+
+	if (rc) {
+		if (errno == ERANGE)
+			err(STRTOXX_EXIT_CODE, "%s: '%s'", errmesg, str);
+		errx(STRTOXX_EXIT_CODE, "%s: '%s'", errmesg, str);
+	}
+	return num;
+}
+
+uint64_t str2unum_or_err(const char *str, int base, const char *errmesg, uint64_t up)
+{
+	uint64_t num = 0;
+	int rc;
+
+	rc = ul_strtou64(str, &num, base);
+	if (rc == 0 && (up && num > up))
+		rc = -(errno = ERANGE);
+
+	if (rc) {
+		if (errno == ERANGE)
+			err(STRTOXX_EXIT_CODE, "%s: '%s'", errmesg, str);
+		errx(STRTOXX_EXIT_CODE, "%s: '%s'", errmesg, str);
+	}
+	return num;
+}
+
+double strtod_or_err(const char *str, const char *errmesg)
+{
+	double num;
+	char *end = NULL;
+
+	errno = 0;
+	if (str == NULL || *str == '\0')
+		goto err;
+	num = strtod(str, &end);
+
+	if (errno || str == end || (end && *end))
+		goto err;
+
+	return num;
+err:
+	if (errno == ERANGE)
+		err(STRTOXX_EXIT_CODE, "%s: '%s'", errmesg, str);
+
+	errx(STRTOXX_EXIT_CODE, "%s: '%s'", errmesg, str);
+}
+
+long double strtold_or_err(const char *str, const char *errmesg)
+{
+	double num;
+	char *end = NULL;
+
+	errno = 0;
+	if (str == NULL || *str == '\0')
+		goto err;
+	num = strtold(str, &end);
+
+	if (errno || str == end || (end && *end))
+		goto err;
+
+	return num;
+err:
+	if (errno == ERANGE)
+		err(STRTOXX_EXIT_CODE, "%s: '%s'", errmesg, str);
+
+	errx(STRTOXX_EXIT_CODE, "%s: '%s'", errmesg, str);
+}
+
+uintmax_t strtosize_or_err(const char *str, const char *errmesg)
+{
+	uintmax_t num;
+
+	if (strtosize(str, &num) == 0)
+		return num;
+
+	if (errno)
+		err(STRTOXX_EXIT_CODE, "%s: '%s'", errmesg, str);
+
+	errx(STRTOXX_EXIT_CODE, "%s: '%s'", errmesg, str);
+}
+
+
+void strtotimeval_or_err(const char *str, struct timeval *tv, const char *errmesg)
+{
+	long double user_input;
+
+	user_input = strtold_or_err(str, errmesg);
+	tv->tv_sec = (time_t) user_input;
+	tv->tv_usec = (suseconds_t)((user_input - tv->tv_sec) * 1000000);
+}
+
+void strtotimespec_or_err(const char *str, struct timespec *ts, const char *errmesg)
+{
+	long double user_input;
+
+	user_input = strtold_or_err(str, errmesg);
+	ts->tv_sec = (time_t) user_input;
+	ts->tv_nsec = (long)((user_input - ts->tv_sec) * 1000000000);
+}
+
+time_t strtotime_or_err(const char *str, const char *errmesg)
+{
+	int64_t user_input;
+
+	user_input = strtos64_or_err(str, errmesg);
+	return (time_t) user_input;
+}
+
+/*
+ * Converts stat->st_mode to ls(1)-like mode string. The size of "str" must
+ * be 11 bytes.
+ */
+char *xstrmode(mode_t mode, char *str)
+{
+	unsigned short i = 0;
+
+	if (S_ISDIR(mode))
+		str[i++] = 'd';
+	else if (S_ISLNK(mode))
+		str[i++] = 'l';
+	else if (S_ISCHR(mode))
+		str[i++] = 'c';
+	else if (S_ISBLK(mode))
+		str[i++] = 'b';
+	else if (S_ISSOCK(mode))
+		str[i++] = 's';
+	else if (S_ISFIFO(mode))
+		str[i++] = 'p';
+	else if (S_ISREG(mode))
+		str[i++] = '-';
+
+	str[i++] = mode & S_IRUSR ? 'r' : '-';
+	str[i++] = mode & S_IWUSR ? 'w' : '-';
+	str[i++] = (mode & S_ISUID
+		? (mode & S_IXUSR ? 's' : 'S')
+		: (mode & S_IXUSR ? 'x' : '-'));
+	str[i++] = mode & S_IRGRP ? 'r' : '-';
+	str[i++] = mode & S_IWGRP ? 'w' : '-';
+	str[i++] = (mode & S_ISGID
+		? (mode & S_IXGRP ? 's' : 'S')
+		: (mode & S_IXGRP ? 'x' : '-'));
+	str[i++] = mode & S_IROTH ? 'r' : '-';
+	str[i++] = mode & S_IWOTH ? 'w' : '-';
+	str[i++] = (mode & S_ISVTX
+		? (mode & S_IXOTH ? 't' : 'T')
+		: (mode & S_IXOTH ? 'x' : '-'));
+	str[i] = '\0';
+
+	return str;
+}
+
+/*
+ * returns exponent (2^x=n) in range KiB..EiB (2^10..2^60)
+ */
+static int get_exp(uint64_t n)
+{
+	int shft;
+
+	for (shft = 10; shft <= 60; shft += 10) {
+		if (n < (1ULL << shft))
+			break;
+	}
+	return shft - 10;
+}
+
+char *size_to_human_string(int options, uint64_t bytes)
+{
+	char buf[32];
+	int dec, exp;
+	uint64_t frac;
+	const char *letters = "BKMGTPE";
+	char suffix[sizeof(" KiB")], *psuf = suffix;
+	char c;
+
+	if (options & SIZE_SUFFIX_SPACE)
+		*psuf++ = ' ';
+
+
+	exp  = get_exp(bytes);
+	c    = *(letters + (exp ? exp / 10 : 0));
+	dec  = exp ? bytes / (1ULL << exp) : bytes;
+	frac = exp ? bytes % (1ULL << exp) : 0;
+
+	*psuf++ = c;
+
+	if ((options & SIZE_SUFFIX_3LETTER) && (c != 'B')) {
+		*psuf++ = 'i';
+		*psuf++ = 'B';
+	}
+
+	*psuf = '\0';
+
+	/* fprintf(stderr, "exp: %d, unit: %c, dec: %d, frac: %jd\n",
+	 *                 exp, suffix[0], dec, frac);
+	 */
+
+	/* round */
+	if (frac) {
+		/* get 3 digits after decimal point */
+		if (frac >= UINT64_MAX / 1000)
+			frac = ((frac / 1024) * 1000) / (1ULL << (exp - 10)) ;
+		else
+			frac = (frac * 1000) / (1ULL << (exp)) ;
+
+		if (options & SIZE_DECIMAL_2DIGITS) {
+			/* round 4/5 and keep 2 digits after decimal point */
+			frac = (frac + 5) / 10 ;
+		} else {
+			/* round 4/5 and keep 1 digit after decimal point */
+			frac = ((frac + 50) / 100) * 10 ;
+		}
+
+		/* rounding could have overflowed */
+		if (frac == 100) {
+			dec++;
+			frac = 0;
+		}
+	}
+
+	if (frac) {
+		struct lconv const *l = localeconv();
+		char *dp = l ? l->decimal_point : NULL;
+		int len;
+
+		if (!dp || !*dp)
+			dp = ".";
+
+		len = snprintf(buf, sizeof(buf), "%d%s%02" PRIu64, dec, dp, frac);
+		if (len > 0 && (size_t) len < sizeof(buf)) {
+			/* remove potential extraneous zero */
+			if (buf[len - 1] == '0')
+				buf[len--] = '\0';
+			/* append suffix */
+			xstrncpy(buf+len, suffix, sizeof(buf) - len);
+		} else
+			*buf = '\0';	/* snprintf error */
+	} else
+		snprintf(buf, sizeof(buf), "%d%s", dec, suffix);
+
+	return strdup(buf);
+}
+
+/*
+ * Parses comma delimited list to array with IDs, for example:
+ *
+ * "aaa,bbb,ccc" --> ary[0] = FOO_AAA;
+ *                   ary[1] = FOO_BBB;
+ *                   ary[3] = FOO_CCC;
+ *
+ * The function name2id() provides conversion from string to ID.
+ *
+ * Returns: >= 0  : number of items added to ary[]
+ *            -1  : parse error or unknown item
+ *            -2  : arysz reached
+ */
+int string_to_idarray(const char *list, int ary[], size_t arysz,
+			int (name2id)(const char *, size_t))
+{
+	const char *begin = NULL, *p;
+	size_t n = 0;
+
+	if (!list || !*list || !ary || !arysz || !name2id)
+		return -1;
+
+	for (p = list; p && *p; p++) {
+		const char *end = NULL;
+		int id;
+
+		if (n >= arysz)
+			return -2;
+		if (!begin)
+			begin = p;		/* begin of the column name */
+		if (*p == ',')
+			end = p;		/* terminate the name */
+		if (*(p + 1) == '\0')
+			end = p + 1;		/* end of string */
+		if (!begin || !end)
+			continue;
+		if (end <= begin)
+			return -1;
+
+		id = name2id(begin, end - begin);
+		if (id == -1)
+			return -1;
+		ary[ n++ ] = id;
+		begin = NULL;
+		if (end && !*end)
+			break;
+	}
+	return n;
+}
+
+/*
+ * Parses the array like string_to_idarray but if format is "+aaa,bbb"
+ * it adds fields to array instead of replacing them.
+ */
+int string_add_to_idarray(const char *list, int ary[], size_t arysz,
+			size_t *ary_pos, int (name2id)(const char *, size_t))
+{
+	const char *list_add;
+	int r;
+
+	if (!list || !*list || !ary_pos || *ary_pos > arysz)
+		return -1;
+
+	if (list[0] == '+')
+		list_add = &list[1];
+	else {
+		list_add = list;
+		*ary_pos = 0;
+	}
+
+	r = string_to_idarray(list_add, &ary[*ary_pos], arysz - *ary_pos, name2id);
+	if (r > 0)
+		*ary_pos += r;
+	return r;
+}
+
+/*
+ * LIST ::= <item> [, <item>]
+ *
+ * The <item> is translated to 'id' by name2id() function and the 'id' is used
+ * as a position in the 'ary' bit array. It means that the 'id' has to be in
+ * range <0..N> where N < sizeof(ary) * NBBY.
+ *
+ * If allow_range is enabled:
+ * An item ending in '+' also sets all bits in <0..N>.
+ * An item beginning with '+' also sets all bits in <N..allow_minus>.
+ *
+ * Returns: 0 on success, <0 on error.
+ */
+int string_to_bitarray(const char *list,
+		     char *ary,
+		     int (*name2bit)(const char *, size_t),
+		     size_t allow_range)
+{
+	const char *begin = NULL, *p;
+
+	if (!list || !name2bit || !ary)
+		return -EINVAL;
+
+	for (p = list; p && *p; p++) {
+		const char *end = NULL;
+		int bit, set_lower = 0, set_higher = 0;
+
+		if (!begin)
+			begin = p;		/* begin of the level name */
+		if (*p == ',')
+			end = p;		/* terminate the name */
+		if (*(p + 1) == '\0')
+			end = p + 1;		/* end of string */
+		if (!begin || !end)
+			continue;
+		if (end <= begin)
+			return -1;
+		if (allow_range) {
+			if (*(end - 1) == '+') {
+				end--;
+				set_lower = 1;
+			} else if (*begin == '+') {
+				begin++;
+				set_higher = 1;
+			}
+		}
+
+		bit = name2bit(begin, end - begin);
+		if (bit < 0)
+			return bit;
+		setbit(ary, bit);
+		if (set_lower)
+			while (--bit >= 0)
+				setbit(ary, bit);
+		else if (set_higher)
+			while (++bit < (int) allow_range)
+				setbit(ary, bit);
+		begin = NULL;
+		if (end && !*end)
+			break;
+	}
+	return 0;
+}
+
+/*
+ * LIST ::= <item> [, <item>]
+ *
+ * The <item> is translated to 'id' by name2flag() function and the flags is
+ * set to the 'mask'
+*
+ * Returns: 0 on success, <0 on error.
+ */
+int string_to_bitmask(const char *list,
+		     unsigned long *mask,
+		     long (*name2flag)(const char *, size_t))
+{
+	const char *begin = NULL, *p;
+
+	if (!list || !name2flag || !mask)
+		return -EINVAL;
+
+	for (p = list; p && *p; p++) {
+		const char *end = NULL;
+		long flag;
+
+		if (!begin)
+			begin = p;		/* begin of the level name */
+		if (*p == ',')
+			end = p;		/* terminate the name */
+		if (*(p + 1) == '\0')
+			end = p + 1;		/* end of string */
+		if (!begin || !end)
+			continue;
+		if (end <= begin)
+			return -1;
+
+		flag = name2flag(begin, end - begin);
+		if (flag < 0)
+			return flag;	/* error */
+		*mask |= flag;
+		begin = NULL;
+		if (end && !*end)
+			break;
+	}
+	return 0;
+}
+
+/*
+ * Parse the lower and higher values in a string containing
+ * "lower:higher" or "lower-higher" format. Note that either
+ * the lower or the higher values may be missing, and the def
+ * value will be assigned to it by default.
+ *
+ * Returns: 0 on success, <0 on error.
+ */
+int parse_range(const char *str, int *lower, int *upper, int def)
+{
+	char *end = NULL;
+
+	if (!str)
+		return 0;
+
+	*upper = *lower = def;
+	errno = 0;
+
+	if (*str == ':') {				/* <:N> */
+		str++;
+		*upper = strtol(str, &end, 10);
+		if (errno || !end || *end || end == str)
+			return -1;
+	} else {
+		*upper = *lower = strtol(str, &end, 10);
+		if (errno || !end || end == str)
+			return -1;
+
+		if (*end == ':' && !*(end + 1))		/* <M:> */
+			*upper = def;
+		else if (*end == '-' || *end == ':') {	/* <M:N> <M-N> */
+			str = end + 1;
+			end = NULL;
+			errno = 0;
+			*upper = strtol(str, &end, 10);
+
+			if (errno || !end || *end || end == str)
+				return -1;
+		}
+	}
+	return 0;
+}
+
+static const char *next_path_segment(const char *str, size_t *sz)
+{
+	const char *start, *p;
+
+	start = str;
+	*sz = 0;
+	while (start && *start == '/' && *(start + 1) == '/')
+		start++;
+
+	if (!start || !*start)
+		return NULL;
+
+	for (*sz = 1, p = start + 1; *p && *p != '/'; p++) {
+		(*sz)++;
+	}
+
+	return start;
+}
+
+int streq_paths(const char *a, const char *b)
+{
+	while (a && b) {
+		size_t a_sz, b_sz;
+		const char *a_seg = next_path_segment(a, &a_sz);
+		const char *b_seg = next_path_segment(b, &b_sz);
+
+		/*
+		fprintf(stderr, "A>>>(%zu) '%s'\n", a_sz, a_seg);
+		fprintf(stderr, "B>>>(%zu) '%s'\n", b_sz, b_seg);
+		*/
+
+		/* end of the path */
+		if (a_sz + b_sz == 0)
+			return 1;
+
+		/* ignore tailing slash */
+		if (a_sz + b_sz == 1 &&
+		    ((a_seg && *a_seg == '/') || (b_seg && *b_seg == '/')))
+			return 1;
+
+		if (!a_seg || !b_seg)
+			break;
+		if (a_sz != b_sz || strncmp(a_seg, b_seg, a_sz) != 0)
+			break;
+
+		a = a_seg + a_sz;
+		b = b_seg + b_sz;
+	};
+
+	return 0;
+}
+
+/* concatenate two strings to a new string, the size of the second string is limited by @b */
+char *strnconcat(const char *s, const char *suffix, size_t b)
+{
+        size_t a;
+        char *r;
+
+        if (!s && !suffix)
+                return strdup("");
+        if (!s)
+                return strndup(suffix, b);
+        if (!suffix)
+                return strdup(s);
+
+        assert(s);
+        assert(suffix);
+
+        a = strlen(s);
+        if (b > ((size_t) -1) - a)
+                return NULL;
+
+        r = malloc(a + b + 1);
+        if (!r)
+                return NULL;
+
+        memcpy(r, s, a);
+        memcpy(r + a, suffix, b);
+        r[a+b] = 0;
+
+        return r;
+}
+
+/* concatenate two strings to a new string */
+char *strconcat(const char *s, const char *suffix)
+{
+        return strnconcat(s, suffix, suffix ? strlen(suffix) : 0);
+}
+
+/* concatenate @s and string defined by @format to a new string */
+char *strfconcat(const char *s, const char *format, ...)
+{
+	va_list ap;
+	char *val, *res;
+	int sz;
+
+	va_start(ap, format);
+	sz = vasprintf(&val, format, ap);
+	va_end(ap);
+
+	if (sz < 0)
+		return NULL;
+
+	res = strnconcat(s, val, sz);
+	free(val);
+	return res;
+}
+
+int strappend(char **a, const char *b)
+{
+	size_t al, bl;
+	char *tmp;
+
+	if (!a)
+		return -EINVAL;
+	if (!b || !*b)
+		return 0;
+	if (!*a) {
+		*a = strdup(b);
+		return !*a ? -ENOMEM : 0;
+	}
+
+	al = strlen(*a);
+	bl = strlen(b);
+
+	tmp = realloc(*a, al + bl + 1);
+	if (!tmp)
+		return -ENOMEM;
+	*a = tmp;
+	memcpy((*a) + al, b, bl + 1);
+	return 0;
+}
+
+static size_t strcspn_escaped(const char *s, const char *reject)
+{
+        int escaped = 0;
+        int n;
+
+        for (n=0; s[n]; n++) {
+                if (escaped)
+                        escaped = 0;
+                else if (s[n] == '\\')
+                        escaped = 1;
+                else if (strchr(reject, s[n]))
+                        break;
+        }
+
+        /* if s ends in \, return index of previous char */
+        return n - escaped;
+}
+
+/*
+ * Like strchr() but ignores @c if escaped by '\', '\\' is interpreted like '\'.
+ *
+ * For example for @c='X':
+ *
+ *      "abcdXefgXh"    --> "XefgXh"
+ *	"abcd\XefgXh"   --> "Xh"
+ *	"abcd\\XefgXh"  --> "XefgXh"
+ *	"abcd\\\XefgXh" --> "Xh"
+ *	"abcd\Xefg\Xh"  --> (null)
+ *
+ *	"abcd\\XefgXh"  --> "\XefgXh"   for @c='\\'
+ */
+char *ul_strchr_escaped(const char *s, int c)
+{
+	char *p;
+	int esc = 0;
+
+	for (p = (char *) s; p && *p; p++) {
+		if (!esc && *p == '\\') {
+			esc = 1;
+			continue;
+		}
+		if (*p == c && (!esc || c == '\\'))
+			return p;
+		esc = 0;
+	}
+
+	return NULL;
+}
+
+/* Split a string into words. */
+const char *split(const char **state, size_t *l, const char *separator, int quoted)
+{
+        const char *current;
+
+        current = *state;
+
+        if (!*current) {
+                assert(**state == '\0');
+                return NULL;
+        }
+
+        current += strspn(current, separator);
+        if (!*current) {
+                *state = current;
+                return NULL;
+        }
+
+        if (quoted && strchr("\'\"", *current)) {
+                char quotechars[2] = {*current, '\0'};
+
+                *l = strcspn_escaped(current + 1, quotechars);
+                if (current[*l + 1] == '\0' || current[*l + 1] != quotechars[0] ||
+                    (current[*l + 2] && !strchr(separator, current[*l + 2]))) {
+                        /* right quote missing or garbage at the end */
+                        *state = current;
+                        return NULL;
+                }
+                *state = current++ + *l + 2;
+        } else if (quoted) {
+                *l = strcspn_escaped(current, separator);
+                if (current[*l] && !strchr(separator, current[*l])) {
+                        /* unfinished escape */
+                        *state = current;
+                        return NULL;
+                }
+                *state = current + *l;
+        } else {
+                *l = strcspn(current, separator);
+                *state = current + *l;
+        }
+
+        return current;
+}
+
+/* Rewind file pointer forward to new line.  */
+int skip_fline(FILE *fp)
+{
+	int ch;
+
+	do {
+		if ((ch = fgetc(fp)) == EOF)
+			return 1;
+		if (ch == '\n')
+			return 0;
+	} while (1);
+}
+
+
+/* compare two strings, but ignoring non-alnum and case of the characters, for example
+ * "Hello (123)!" is the same as "hello123".
+ */
+int ul_stralnumcmp(const char *p1, const char *p2)
+{
+	const unsigned char *s1 = (const unsigned char *) p1;
+	const unsigned char *s2 = (const unsigned char *) p2;
+	unsigned char c1, c2;
+
+	do {
+		do {
+			c1 = (unsigned char) *s1++;
+		} while (c1 != '\0' && !isalnum((unsigned int) c1));
+
+		do {
+			c2 = (unsigned char) *s2++;
+		} while (c2 != '\0' && !isalnum((unsigned int) c2));
+
+		if (c1 != '\0')
+			c1 = tolower(c1);
+		if (c2 != '\0')
+			c2 = tolower(c2);
+		if (c1 == '\0')
+			return c1 - c2;
+	} while (c1 == c2);
+
+	return c1 - c2;
+}
+
+/*
+ * Parses the first option from @optstr. The @optstr pointer is set to the beginning
+ * of the next option. The options string looks like 'aaa,bbb=data,foo,bar="xxx"'.
+ *
+ * Note this function is used by libmount to parse mount options. Be careful when modify.
+ *
+ * Returns -EINVAL on parse error, 1 at the end of optstr and 0 on success.
+ */
+int ul_optstr_next(char **optstr, char **name, size_t *namesz,
+		   char **value, size_t *valsz)
+{
+	int open_quote = 0;
+	char *start = NULL, *stop = NULL, *p, *sep = NULL;
+	char *optstr0;
+
+	assert(optstr);
+	assert(*optstr);
+
+	optstr0 = *optstr;
+
+	if (name)
+		*name = NULL;
+	if (namesz)
+		*namesz = 0;
+	if (value)
+		*value = NULL;
+	if (valsz)
+		*valsz = 0;
+
+	/* trim leading commas as to not invalidate option
+	 * strings with multiple consecutive commas */
+	while (optstr0 && *optstr0 == ',')
+		optstr0++;
+
+	for (p = optstr0; p && *p; p++) {
+		if (!start)
+			start = p;		/* beginning of the option item */
+		if (*p == '"')
+			open_quote ^= 1;	/* reverse the status */
+		if (open_quote)
+			continue;		/* still in quoted block */
+		if (!sep && p > start && *p == '=')
+			sep = p;		/* name and value separator */
+		if (*p == ',' && (p == optstr0 || *(p - 1) != '\\'))
+			stop = p;		/* terminate the option item */
+		else if (*(p + 1) == '\0')
+			stop = p + 1;		/* end of optstr */
+		if (!start || !stop)
+			continue;
+		if (stop <= start)
+			return -EINVAL;
+
+		if (name)
+			*name = start;
+		if (namesz)
+			*namesz = sep ? sep - start : stop - start;
+		*optstr = *stop ? stop + 1 : stop;
+
+		if (sep) {
+			if (value)
+				*value = sep + 1;
+			if (valsz)
+				*valsz = stop - sep - 1;
+		}
+		return 0;
+	}
+
+	return 1;				/* end of optstr */
+}
+
+#ifdef TEST_PROGRAM_STRUTILS
+
+#include "cctype.h"
+
+struct testS {
+	char *name;
+	char *value;
+};
+
+static int test_strdup_to_member(int argc, char *argv[])
+{
+	struct testS *xx;
+
+	if (argc < 3)
+		return EXIT_FAILURE;
+
+	xx = calloc(1, sizeof(*xx));
+	if (!xx)
+		err(EXIT_FAILURE, "calloc() failed");
+
+	strdup_to_struct_member(xx, name, argv[1]);
+	strdup_to_struct_member(xx, value, argv[2]);
+
+	if (strcmp(xx->name, argv[1]) != 0 &&
+	    strcmp(xx->value, argv[2]) != 0)
+		errx(EXIT_FAILURE, "strdup_to_struct_member() failed");
+
+	printf("1: '%s', 2: '%s'\n", xx->name, xx->value);
+
+	free(xx->name);
+	free(xx->value);
+	free(xx);
+	return EXIT_SUCCESS;
+}
+
+static int test_strutils_sizes(int argc, char *argv[])
+{
+	uintmax_t size = 0;
+	char *hum1, *hum2, *hum3;
+
+	if (argc < 2)
+		return EXIT_FAILURE;
+
+	if (strtosize(argv[1], &size))
+		errx(EXIT_FAILURE, "invalid size '%s' value", argv[1]);
+
+	hum1 = size_to_human_string(SIZE_SUFFIX_1LETTER, size);
+	hum2 = size_to_human_string(SIZE_SUFFIX_3LETTER |
+				    SIZE_SUFFIX_SPACE, size);
+	hum3 = size_to_human_string(SIZE_SUFFIX_3LETTER |
+				    SIZE_SUFFIX_SPACE |
+				    SIZE_DECIMAL_2DIGITS, size);
+
+	printf("%25s : %20ju : %8s : %12s : %13s\n", argv[1], size, hum1, hum2, hum3);
+	free(hum1);
+	free(hum2);
+	free(hum3);
+
+	return EXIT_SUCCESS;
+}
+
+static int test_strutils_cmp_paths(int argc, char *argv[])
+{
+	int rc = streq_paths(argv[1], argv[2]);
+
+	if (argc < 3)
+		return EXIT_FAILURE;
+
+	printf("%s: '%s' '%s'\n", rc == 1 ? "YES" : "NOT", argv[1], argv[2]);
+	return EXIT_SUCCESS;
+}
+
+static int test_strutils_normalize(int argc, char *argv[])
+{
+	unsigned char *src, *dst, *org;
+	size_t sz, len;
+
+	if (argc < 2)
+		return EXIT_FAILURE;
+
+	org = (unsigned char *) strdup(argv[1]);
+	src = (unsigned char *) strdup((char *) org);
+	len = strlen((char *) src);
+	dst = malloc(len + 1);
+
+	if (!org || !src || !dst)
+		goto done;
+
+	/* two buffers */
+	sz = __normalize_whitespace(src, len, dst, len + 1);
+	printf("1: '%s' --> '%s' [sz=%zu]\n", src, dst, sz);
+
+	/* one buffer */
+	sz = normalize_whitespace(src);
+	printf("2: '%s' --> '%s' [sz=%zu]\n", org, src, sz);
+
+done:
+	free(src);
+	free(dst);
+	free(org);
+
+	return EXIT_SUCCESS;
+}
+
+static int test_strutils_cstrcasecmp(int argc, char *argv[])
+{
+	char *a, *b;
+
+	if (argc < 3)
+		return EXIT_FAILURE;
+
+	a = argv[1];
+	b = argv[2];
+
+	if (!a || !b)
+		return EXIT_FAILURE;
+
+	printf("cmp    '%s' '%s' = %d\n", a, b, strcasecmp(a, b));
+	printf("c_cmp  '%s' '%s' = %d\n", a, b, c_strcasecmp(a, b));
+	printf("c_ncmp '%s' '%s' = %d\n", a, b, c_strncasecmp(a, b, strlen(a)));
+
+	return EXIT_SUCCESS;
+}
+
+int main(int argc, char *argv[])
+{
+	if (argc == 3 && strcmp(argv[1], "--size") == 0) {
+		return test_strutils_sizes(argc - 1, argv + 1);
+
+	} else if (argc == 4 && strcmp(argv[1], "--cmp-paths") == 0) {
+		return test_strutils_cmp_paths(argc - 1, argv + 1);
+
+	} else if (argc == 4 && strcmp(argv[1], "--strdup-member") == 0) {
+		return test_strdup_to_member(argc - 1, argv + 1);
+
+	} else if  (argc == 4 && strcmp(argv[1], "--stralnumcmp") == 0) {
+		printf("%s\n", ul_stralnumcmp(argv[2], argv[3]) == 0 ?
+				"match" : "dismatch");
+		return EXIT_SUCCESS;
+
+	} else if (argc == 4 && strcmp(argv[1], "--cstrcasecmp") == 0) {
+		return test_strutils_cstrcasecmp(argc - 1, argv + 1);
+
+	} else if (argc == 3 && strcmp(argv[1], "--normalize") == 0) {
+		return test_strutils_normalize(argc - 1, argv + 1);
+
+	} else if (argc == 3 && strcmp(argv[1], "--strtos64") == 0) {
+		printf("'%s'-->%jd\n", argv[2], strtos64_or_err(argv[2], "strtos64 failed"));
+		return EXIT_SUCCESS;
+	} else if (argc == 3 && strcmp(argv[1], "--strtou64") == 0) {
+		printf("'%s'-->%ju\n", argv[2], strtou64_or_err(argv[2], "strtou64 failed"));
+		return EXIT_SUCCESS;
+	} else if (argc == 3 && strcmp(argv[1], "--strtos32") == 0) {
+		printf("'%s'-->%d\n", argv[2], strtos32_or_err(argv[2], "strtos32 failed"));
+		return EXIT_SUCCESS;
+	} else if (argc == 3 && strcmp(argv[1], "--strtou32") == 0) {
+		printf("'%s'-->%u\n", argv[2], strtou32_or_err(argv[2], "strtou32 failed"));
+		return EXIT_SUCCESS;
+	} else if (argc == 3 && strcmp(argv[1], "--strtos16") == 0) {
+		printf("'%s'-->%hd\n", argv[2], strtos16_or_err(argv[2], "strtos16 failed"));
+		return EXIT_SUCCESS;
+	} else if (argc == 3 && strcmp(argv[1], "--strtou16") == 0) {
+		printf("'%s'-->%hu\n", argv[2], strtou16_or_err(argv[2], "strtou16 failed"));
+		return EXIT_SUCCESS;
+
+	} else if (argc == 4 && strcmp(argv[1], "--strchr-escaped") == 0) {
+		printf("\"%s\" --> \"%s\"\n", argv[2], ul_strchr_escaped(argv[2], *argv[3]));
+		return EXIT_SUCCESS;
+
+	} else {
+		fprintf(stderr, "usage: %1$s --size <number>[suffix]\n"
+				"       %1$s --cmp-paths <path> <path>\n"
+				"       %1$s --strdup-member <str> <str>\n"
+				"       %1$s --stralnumcmp <str> <str>\n"
+				"       %1$s --cstrcasecmp <str> <str>\n"
+				"       %1$s --normalize <str>\n"
+				"       %1$s --strto{s,u}{16,32,64} <str>\n",
+				argv[0]);
+		exit(EXIT_FAILURE);
+	}
+
+	return EXIT_FAILURE;
+}
+#endif /* TEST_PROGRAM_STRUTILS */
diff --git a/lib/strv.c b/lib/strv.c
new file mode 100644
index 0000000..c306e38
--- /dev/null
+++ b/lib/strv.c
@@ -0,0 +1,405 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * Copyright (C) 2010 Lennart Poettering
+ * Copyright (C) 2015-2022 Karel Zak <kzak@redhat.com>
+ *
+ * This is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ *
+ * Copyright (C) 2015 Karel Zak <kzak@redhat.com>
+ *    Modified the original version from systemd project for util-linux.
+ */
+
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <assert.h>
+
+#include "strutils.h"
+#include "strv.h"
+
+void strv_clear(char **l) {
+        char **k;
+
+        if (!l)
+                return;
+
+        for (k = l; *k; k++)
+                free(*k);
+
+        *l = NULL;
+}
+
+char **strv_free(char **l) {
+        strv_clear(l);
+        free(l);
+        return NULL;
+}
+
+char **strv_copy(char * const *l) {
+        char **r, **k;
+
+        k = r = malloc(sizeof(char *) * (strv_length(l) + 1));
+        if (!r)
+                return NULL;
+
+        if (l)
+                for (; *l; k++, l++) {
+                        *k = strdup(*l);
+                        if (!*k) {
+                                strv_free(r);
+                                return NULL;
+                        }
+                }
+
+        *k = NULL;
+        return r;
+}
+
+unsigned strv_length(char * const *l) {
+        unsigned n = 0;
+
+        if (!l)
+                return 0;
+
+        for (; *l; l++)
+                n++;
+
+        return n;
+}
+
+char **strv_new_ap(const char *x, va_list ap) {
+        const char *s;
+        char **a;
+        unsigned n = 0, i = 0;
+        va_list aq;
+
+        /* As a special trick we ignore all listed strings that equal
+         * (const char*) -1. This is supposed to be used with the
+         * STRV_IFNOTNULL() macro to include possibly NULL strings in
+         * the string list. */
+
+        if (x) {
+                n = x == (const char*) -1 ? 0 : 1;
+
+                va_copy(aq, ap);
+                while ((s = va_arg(aq, const char*))) {
+                        if (s == (const char*) -1)
+                                continue;
+
+                        n++;
+                }
+
+                va_end(aq);
+        }
+
+        a = malloc(sizeof(char *) * (n + 1));
+        if (!a)
+                return NULL;
+
+        if (x) {
+                if (x != (const char*) -1) {
+                        a[i] = strdup(x);
+                        if (!a[i])
+                                goto fail;
+                        i++;
+                }
+
+                while ((s = va_arg(ap, const char*))) {
+
+                        if (s == (const char*) -1)
+                                continue;
+
+                        a[i] = strdup(s);
+                        if (!a[i])
+                                goto fail;
+
+                        i++;
+                }
+        }
+
+        a[i] = NULL;
+
+        return a;
+
+fail:
+        strv_free(a);
+        return NULL;
+}
+
+char **strv_new(const char *x, ...) {
+        char **r;
+        va_list ap;
+
+        va_start(ap, x);
+        r = strv_new_ap(x, ap);
+        va_end(ap);
+
+        return r;
+}
+
+int strv_extend_strv(char ***a, char **b) {
+        int r;
+        char **s;
+
+        STRV_FOREACH(s, b) {
+                r = strv_extend(a, *s);
+                if (r < 0)
+                        return r;
+        }
+
+        return 0;
+}
+
+int strv_extend_strv_concat(char ***a, char **b, const char *suffix) {
+        int r;
+        char **s;
+
+        STRV_FOREACH(s, b) {
+                char *v;
+
+                v = strconcat(*s, suffix);
+                if (!v)
+                        return -ENOMEM;
+
+                r = strv_push(a, v);
+                if (r < 0) {
+                        free(v);
+                        return r;
+                }
+        }
+
+        return 0;
+}
+
+
+#define _FOREACH_WORD(word, length, s, separator, quoted, state)        \
+        for ((state) = (s), (word) = split(&(state), &(length), (separator), (quoted)); (word); (word) = split(&(state), &(length), (separator), (quoted)))
+
+#define FOREACH_WORD_SEPARATOR(word, length, s, separator, state)       \
+        _FOREACH_WORD(word, length, s, separator, false, state)
+
+
+char **strv_split(const char *s, const char *separator) {
+        const char *word, *state;
+        size_t l;
+        unsigned n, i;
+        char **r;
+
+        assert(s);
+
+        n = 0;
+        FOREACH_WORD_SEPARATOR(word, l, s, separator, state)
+                n++;
+
+        r = malloc(sizeof(char *) * (n + 1));
+        if (!r)
+                return NULL;
+
+        i = 0;
+        FOREACH_WORD_SEPARATOR(word, l, s, separator, state) {
+                r[i] = strndup(word, l);
+                if (!r[i]) {
+                        strv_free(r);
+                        return NULL;
+                }
+
+                i++;
+        }
+
+        r[i] = NULL;
+        return r;
+}
+
+char *strv_join(char **l, const char *separator) {
+        char *r, *e;
+        char **s;
+        size_t n, k;
+
+        if (!separator)
+                separator = " ";
+
+        k = strlen(separator);
+
+        n = 0;
+        STRV_FOREACH(s, l) {
+                if (n != 0)
+                        n += k;
+                n += strlen(*s);
+        }
+
+        r = malloc(n + 1);
+        if (!r)
+                return NULL;
+
+        e = r;
+        STRV_FOREACH(s, l) {
+                if (e != r)
+                        e = stpcpy(e, separator);
+
+                e = stpcpy(e, *s);
+        }
+
+        *e = 0;
+
+        return r;
+}
+
+int strv_push(char ***l, char *value) {
+        char **c;
+        unsigned n, m;
+
+        if (!value)
+                return 0;
+
+        n = strv_length(*l);
+
+        /* Increase and check for overflow */
+        m = n + 2;
+        if (m < n)
+                return -ENOMEM;
+
+        c = realloc(*l, sizeof(char *) * m);
+        if (!c)
+                return -ENOMEM;
+
+        c[n] = value;
+        c[n+1] = NULL;
+
+        *l = c;
+        return 0;
+}
+
+int strv_push_prepend(char ***l, char *value) {
+        char **c;
+        unsigned n, m, i;
+
+        if (!value)
+                return 0;
+
+        n = strv_length(*l);
+
+        /* increase and check for overflow */
+        m = n + 2;
+        if (m < n)
+                return -ENOMEM;
+
+        c = malloc(sizeof(char *) * m);
+        if (!c)
+                return -ENOMEM;
+
+        for (i = 0; i < n; i++)
+                c[i+1] = (*l)[i];
+
+        c[0] = value;
+        c[n+1] = NULL;
+
+        free(*l);
+        *l = c;
+
+        return 0;
+}
+
+int strv_consume(char ***l, char *value) {
+        int r;
+
+        r = strv_push(l, value);
+        if (r < 0)
+                free(value);
+
+        return r;
+}
+
+int strv_consume_prepend(char ***l, char *value) {
+        int r;
+
+        r = strv_push_prepend(l, value);
+        if (r < 0)
+                free(value);
+
+        return r;
+}
+
+int strv_extend(char ***l, const char *value) {
+        char *v;
+
+        if (!value)
+                return 0;
+
+        v = strdup(value);
+        if (!v)
+                return -ENOMEM;
+
+        return strv_consume(l, v);
+}
+
+char **strv_remove(char **l, const char *s) {
+        char **f, **t;
+
+        if (!l)
+                return NULL;
+
+        assert(s);
+
+        /* Drops every occurrence of s in the string list, edits
+         * in-place. */
+
+        for (f = t = l; *f; f++)
+                if (strcmp(*f, s) == 0)
+                        free(*f);
+                else
+                        *(t++) = *f;
+
+        *t = NULL;
+        return l;
+}
+
+int strv_extendf(char ***l, const char *format, ...) {
+        va_list ap;
+        char *x;
+        int r;
+
+        va_start(ap, format);
+        r = vasprintf(&x, format, ap);
+        va_end(ap);
+
+        if (r < 0)
+                return -ENOMEM;
+
+        return strv_consume(l, x);
+}
+
+int strv_extendv(char ***l, const char *format, va_list ap) {
+        char *x;
+        int r;
+
+        r = vasprintf(&x, format, ap);
+        if (r < 0)
+                return -ENOMEM;
+
+        return strv_consume(l, x);
+}
+
+char **strv_reverse(char **l) {
+        unsigned n, i;
+
+        n = strv_length(l);
+        if (n <= 1)
+                return l;
+
+        for (i = 0; i < n / 2; i++) {
+                char *t;
+
+                t = l[i];
+                l[i] = l[n-1-i];
+                l[n-1-i] = t;
+        }
+
+        return l;
+}
diff --git a/lib/swapprober.c b/lib/swapprober.c
new file mode 100644
index 0000000..594496f
--- /dev/null
+++ b/lib/swapprober.c
@@ -0,0 +1,54 @@
+/*
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Written by Karel Zak <kzak@redhat.com>
+ */
+#include "c.h"
+#include "nls.h"
+
+#include "swapheader.h"
+#include "swapprober.h"
+
+blkid_probe get_swap_prober(const char *devname)
+{
+	blkid_probe pr;
+	int rc;
+	const char *version = NULL;
+	char *swap_filter[] = { "swap", NULL };
+
+	pr = blkid_new_probe_from_filename(devname);
+	if (!pr) {
+		warn(_("%s: unable to probe device"), devname);
+		return NULL;
+	}
+
+	blkid_probe_enable_superblocks(pr, TRUE);
+	blkid_probe_set_superblocks_flags(pr,
+			BLKID_SUBLKS_LABEL | BLKID_SUBLKS_UUID |
+			BLKID_SUBLKS_VERSION);
+
+	blkid_probe_filter_superblocks_type(pr, BLKID_FLTR_ONLYIN, swap_filter);
+
+	rc = blkid_do_safeprobe(pr);
+	if (rc == -1)
+		warn(_("%s: unable to probe device"), devname);
+	else if (rc == -2)
+		warnx(_("%s: ambiguous probing result; use wipefs(8)"), devname);
+	else if (rc == 1)
+		warnx(_("%s: not a valid swap partition"), devname);
+
+	if (rc == 0) {
+		/* Only the SWAPSPACE2 is supported. */
+		if (blkid_probe_lookup_value(pr, "VERSION", &version, NULL) == 0
+		    && version
+		    && strcmp(version, stringify_value(SWAP_VERSION)) != 0)
+			warnx(_("%s: unsupported swap version '%s'"),
+						devname, version);
+		else
+			return pr;
+	}
+
+	blkid_free_probe(pr);
+	return NULL;
+}
diff --git a/lib/sysfs.c b/lib/sysfs.c
new file mode 100644
index 0000000..dfacf4a
--- /dev/null
+++ b/lib/sysfs.c
@@ -0,0 +1,1254 @@
+/*
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Copyright (C) 2011 Karel Zak <kzak@redhat.com>
+ */
+#include <ctype.h>
+#include <libgen.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "c.h"
+#include "pathnames.h"
+#include "sysfs.h"
+#include "fileutils.h"
+#include "all-io.h"
+#include "debug.h"
+#include "strutils.h"
+#include "buffer.h"
+
+static void sysfs_blkdev_deinit_path(struct path_cxt *pc);
+static int  sysfs_blkdev_enoent_redirect(struct path_cxt *pc, const char *path, int *dirfd);
+
+/*
+ * Debug stuff (based on include/debug.h)
+ */
+static UL_DEBUG_DEFINE_MASK(ulsysfs);
+UL_DEBUG_DEFINE_MASKNAMES(ulsysfs) = UL_DEBUG_EMPTY_MASKNAMES;
+
+#define ULSYSFS_DEBUG_INIT	(1 << 1)
+#define ULSYSFS_DEBUG_CXT	(1 << 2)
+
+#define DBG(m, x)       __UL_DBG(ulsysfs, ULSYSFS_DEBUG_, m, x)
+#define ON_DBG(m, x)    __UL_DBG_CALL(ulsysfs, ULSYSFS_DEBUG_, m, x)
+
+#define UL_DEBUG_CURRENT_MASK	UL_DEBUG_MASK(ulsysfs)
+#include "debugobj.h"
+
+void ul_sysfs_init_debug(void)
+{
+	if (ulsysfs_debug_mask)
+		return;
+	__UL_INIT_DEBUG_FROM_ENV(ulsysfs, ULSYSFS_DEBUG_, 0, ULSYSFS_DEBUG);
+}
+
+struct path_cxt *ul_new_sysfs_path(dev_t devno, struct path_cxt *parent, const char *prefix)
+{
+	struct path_cxt *pc = ul_new_path(NULL);
+
+	if (!pc)
+		return NULL;
+	if (prefix)
+		ul_path_set_prefix(pc, prefix);
+
+	if (sysfs_blkdev_init_path(pc, devno, parent) != 0) {
+		ul_unref_path(pc);
+		return NULL;
+	}
+
+	DBG(CXT, ul_debugobj(pc, "alloc"));
+	return pc;
+}
+
+/*
+ * sysfs_blkdev_* is sysfs extension to ul_path_* API for block devices.
+ *
+ * The function is possible to call in loop and without sysfs_blkdev_deinit_path().
+ * The sysfs_blkdev_deinit_path() is automatically called by ul_unref_path().
+ *
+ */
+int sysfs_blkdev_init_path(struct path_cxt *pc, dev_t devno, struct path_cxt *parent)
+{
+	struct sysfs_blkdev *blk;
+	int rc;
+	char buf[sizeof(_PATH_SYS_DEVBLOCK)
+		 + sizeof(stringify_value(UINT32_MAX)) * 2
+		 + 3];
+
+	/* define path to devno stuff */
+	snprintf(buf, sizeof(buf), _PATH_SYS_DEVBLOCK "/%d:%d", major(devno), minor(devno));
+	rc = ul_path_set_dir(pc, buf);
+	if (rc)
+		return rc;
+
+	/* make sure path exists */
+	rc = ul_path_get_dirfd(pc);
+	if (rc < 0)
+		return rc;
+
+	/* initialize sysfs blkdev specific stuff */
+	blk = ul_path_get_dialect(pc);
+	if (!blk) {
+		DBG(CXT, ul_debugobj(pc, "alloc new sysfs handler"));
+		blk = calloc(1, sizeof(struct sysfs_blkdev));
+		if (!blk)
+			return -ENOMEM;
+
+		ul_path_set_dialect(pc, blk, sysfs_blkdev_deinit_path);
+		ul_path_set_enoent_redirect(pc, sysfs_blkdev_enoent_redirect);
+	}
+
+	DBG(CXT, ul_debugobj(pc, "init sysfs stuff"));
+
+	blk->devno = devno;
+	sysfs_blkdev_set_parent(pc, parent);
+
+	return 0;
+}
+
+static void sysfs_blkdev_deinit_path(struct path_cxt *pc)
+{
+	struct sysfs_blkdev *blk;
+
+	if (!pc)
+		return;
+
+	DBG(CXT, ul_debugobj(pc, "deinit"));
+
+	blk = ul_path_get_dialect(pc);
+	if (!blk)
+		return;
+
+	ul_unref_path(blk->parent);
+	free(blk);
+
+	ul_path_set_dialect(pc, NULL, NULL);
+}
+
+int sysfs_blkdev_set_parent(struct path_cxt *pc, struct path_cxt *parent)
+{
+	struct sysfs_blkdev *blk = ul_path_get_dialect(pc);
+
+	if (!pc || !blk)
+		return -EINVAL;
+
+	if (blk->parent) {
+		ul_unref_path(blk->parent);
+		blk->parent = NULL;
+	}
+
+	if (parent) {
+		ul_ref_path(parent);
+		blk->parent = parent;
+	} else
+		blk->parent = NULL;
+
+	DBG(CXT, ul_debugobj(pc, "new parent"));
+	return 0;
+}
+
+struct path_cxt *sysfs_blkdev_get_parent(struct path_cxt *pc)
+{
+	struct sysfs_blkdev *blk = ul_path_get_dialect(pc);
+	return blk ? blk->parent : NULL;
+}
+
+/*
+ * Redirects ENOENT errors to the parent.
+ * For example
+ *
+ *	/sys/dev/block/8:1/queue/logical_block_size redirects to
+ *	/sys/dev/block/8:0/queue/logical_block_size
+ */
+static int sysfs_blkdev_enoent_redirect(struct path_cxt *pc, const char *path, int *dirfd)
+{
+	struct sysfs_blkdev *blk = ul_path_get_dialect(pc);
+
+	if (blk && blk->parent && path) {
+		*dirfd = ul_path_get_dirfd(blk->parent);
+		if (*dirfd >= 0) {
+			DBG(CXT, ul_debugobj(pc, "%s redirected to parent", path));
+			return 0;
+		}
+	}
+	return 1;	/* no redirect */
+}
+
+char *sysfs_blkdev_get_name(struct path_cxt *pc, char *buf, size_t bufsiz)
+{
+	char link[PATH_MAX];
+	char *name;
+	ssize_t	sz;
+
+        /* read /sys/dev/block/<maj:min> link */
+	sz = ul_path_readlink(pc, link, sizeof(link), NULL);
+	if (sz < 0)
+		return NULL;
+
+	name = strrchr(link, '/');
+	if (!name)
+		return NULL;
+
+	name++;
+	sz = strlen(name);
+	if ((size_t) sz + 1 > bufsiz)
+		return NULL;
+
+	memcpy(buf, name, sz + 1);
+	sysfs_devname_sys_to_dev(buf);
+	return buf;
+}
+
+int sysfs_blkdev_is_partition_dirent(DIR *dir, struct dirent *d, const char *parent_name)
+{
+	char path[NAME_MAX + 6 + 1];
+
+#ifdef _DIRENT_HAVE_D_TYPE
+	if (d->d_type != DT_DIR &&
+	    d->d_type != DT_LNK &&
+	    d->d_type != DT_UNKNOWN)
+		return 0;
+#endif
+	size_t len = 0;
+
+	if (parent_name) {
+		const char *p = parent_name;
+
+		/* /dev/sda --> "sda" */
+		if (*parent_name == '/') {
+			p = strrchr(parent_name, '/');
+			if (!p)
+				return 0;
+			p++;
+		}
+
+		len = strlen(p);
+		if ((strlen(d->d_name) <= len) || (strncmp(p, d->d_name, len) != 0))
+			len = 0;
+	}
+
+	if (len > 0) {
+		/* partitions subdir name is
+		 *	"<parent>[:digit:]" or "<parent>p[:digit:]"
+		 */
+		return ((*(d->d_name + len) == 'p' && isdigit(*(d->d_name + len + 1)))
+			|| isdigit(*(d->d_name + len)));
+	}
+
+	/* Cannot use /partition file, not supported on old sysfs */
+	snprintf(path, sizeof(path), "%s/start", d->d_name);
+
+	return faccessat(dirfd(dir), path, R_OK, 0) == 0;
+}
+
+int sysfs_blkdev_count_partitions(struct path_cxt *pc, const char *devname)
+{
+	DIR *dir;
+	struct dirent *d;
+	int r = 0;
+
+	dir = ul_path_opendir(pc, NULL);
+	if (!dir)
+		return 0;
+
+	while ((d = xreaddir(dir))) {
+		if (sysfs_blkdev_is_partition_dirent(dir, d, devname))
+			r++;
+	}
+
+	closedir(dir);
+	return r;
+}
+
+/*
+ * Converts @partno (partition number) to devno of the partition.
+ * The @pc handles wholedisk device.
+ *
+ * Note that this code does not expect any special format of the
+ * partitions devnames.
+ */
+dev_t sysfs_blkdev_partno_to_devno(struct path_cxt *pc, int partno)
+{
+	DIR *dir;
+	struct dirent *d;
+	dev_t devno = 0;
+
+	dir = ul_path_opendir(pc, NULL);
+	if (!dir)
+		return 0;
+
+	while ((d = xreaddir(dir))) {
+		int n;
+
+		if (!sysfs_blkdev_is_partition_dirent(dir, d, NULL))
+			continue;
+
+		if (ul_path_readf_s32(pc, &n, "%s/partition", d->d_name))
+			continue;
+
+		if (n == partno) {
+			if (ul_path_readf_majmin(pc, &devno, "%s/dev", d->d_name) == 0)
+				break;
+		}
+	}
+
+	closedir(dir);
+	DBG(CXT, ul_debugobj(pc, "partno (%d) -> devno (%d)", (int) partno, (int) devno));
+	return devno;
+}
+
+
+/*
+ * Returns slave name if there is only one slave, otherwise returns NULL.
+ * The result should be deallocated by free().
+ */
+char *sysfs_blkdev_get_slave(struct path_cxt *pc)
+{
+	DIR *dir;
+	struct dirent *d;
+	char *name = NULL;
+
+	dir = ul_path_opendir(pc, "slaves");
+	if (!dir)
+		return NULL;
+
+	while ((d = xreaddir(dir))) {
+		if (name)
+			goto err;	/* more slaves */
+		name = strdup(d->d_name);
+	}
+
+	closedir(dir);
+	return name;
+err:
+	free(name);
+	closedir(dir);
+	return NULL;
+}
+
+
+#define SUBSYSTEM_LINKNAME	"/subsystem"
+
+/*
+ * For example:
+ *
+ * chain: /sys/dev/block/../../devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/ \
+ *                           1-1.2:1.0/host65/target65:0:0/65:0:0:0/block/sdb
+ *
+ * The function check if <chain>/subsystem symlink exists, if yes then returns
+ * basename of the readlink result, and remove the last subdirectory from the
+ * <chain> path.
+ */
+static char *get_subsystem(char *chain, char *buf, size_t bufsz)
+{
+	size_t len;
+	char *p;
+
+	if (!chain || !*chain)
+		return NULL;
+
+	len = strlen(chain);
+	if (len + sizeof(SUBSYSTEM_LINKNAME) > PATH_MAX)
+		return NULL;
+
+	do {
+		ssize_t sz;
+
+		/* append "/subsystem" to the path */
+		memcpy(chain + len, SUBSYSTEM_LINKNAME, sizeof(SUBSYSTEM_LINKNAME));
+
+		/* try if subsystem symlink exists */
+		sz = readlink(chain, buf, bufsz - 1);
+
+		/* remove last subsystem from chain */
+		chain[len] = '\0';
+		p = strrchr(chain, '/');
+		if (p) {
+			*p = '\0';
+			len = p - chain;
+		}
+
+		if (sz > 0) {
+			/* we found symlink to subsystem, return basename */
+			buf[sz] = '\0';
+			return basename(buf);
+		}
+
+	} while (p);
+
+	return NULL;
+}
+
+/*
+ * Returns complete path to the device, the path contains all subsystems
+ * used for the device.
+ */
+char *sysfs_blkdev_get_devchain(struct path_cxt *pc, char *buf, size_t bufsz)
+{
+	/* read /sys/dev/block/<maj>:<min> symlink */
+	ssize_t ssz;
+	size_t sz = 0;
+	struct ul_buffer tmp = UL_INIT_BUFFER;
+	const char *p;
+	char *res = NULL;
+
+	ssz = ul_path_readlink(pc, buf, bufsz, NULL);
+	if (ssz <= 0)
+		return NULL;
+
+	if ((p = ul_path_get_prefix(pc)))
+		ul_buffer_append_string(&tmp, p);
+
+	ul_buffer_append_string(&tmp, _PATH_SYS_DEVBLOCK "/");
+	ul_buffer_append_data(&tmp, buf, ssz);
+
+	p = ul_buffer_get_data(&tmp, &sz, NULL);
+	if (p && sz < bufsz) {
+		memcpy(buf, p, sz);
+		res = buf;
+	}
+	ul_buffer_free_data(&tmp);
+	return res;
+}
+
+/*
+ * The @subsys returns the next subsystem in the chain. Function modifies
+ * @devchain string.
+ *
+ * Returns: 0 in success, <0 on error, 1 on end of chain
+ */
+int sysfs_blkdev_next_subsystem(struct path_cxt *pc __attribute__((unused)),
+			 char *devchain, char **subsys)
+{
+	char subbuf[PATH_MAX];
+	char *sub;
+
+	if (!subsys || !devchain)
+		return -EINVAL;
+
+	*subsys = NULL;
+
+	while ((sub = get_subsystem(devchain, subbuf, sizeof(subbuf)))) {
+		*subsys = strdup(sub);
+		if (!*subsys)
+			return -ENOMEM;
+		return 0;
+	}
+
+	return 1;
+}
+
+#define REMOVABLE_FILENAME	"/removable"
+
+/*
+ * For example:
+ *
+ * chain: /sys/dev/block/../../devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/ \
+ *                           1-1.2:1.0/host65/target65:0:0/65:0:0:0/block/sdb
+ */
+static int sysfs_devchain_is_removable(char *chain)
+{
+	size_t len;
+	char buf[20];
+	char *p;
+
+	if (!chain || !*chain)
+		return 0;
+
+	len = strlen(chain);
+	if (len + sizeof(REMOVABLE_FILENAME) > PATH_MAX)
+		return 0;
+
+	do {
+		int fd, rc;
+
+		/* append "/removable" to the path */
+		memcpy(chain + len, REMOVABLE_FILENAME, sizeof(REMOVABLE_FILENAME));
+
+		/* try to read it */
+		fd = open(chain, O_RDONLY);
+		if (fd != -1) {
+			rc = read_all(fd, buf, sizeof(buf));
+			close(fd);
+
+			if (rc > 0) {
+				if (strncmp(buf, "fixed", min(rc, 5)) == 0) {
+					return 0;
+				} else if (strncmp(buf, "removable", min(rc, 9)) == 0) {
+					return 1;
+				}
+			}
+		}
+
+		/* remove last subsystem from chain */
+		chain[len] = '\0';
+		p = strrchr(chain, '/');
+		if (p) {
+			*p = '\0';
+			len = p - chain;
+		}
+
+	} while (p);
+
+	return 0;
+}
+
+int sysfs_blkdev_is_hotpluggable(struct path_cxt *pc)
+{
+	char buf[PATH_MAX], *chain;
+
+	chain = sysfs_blkdev_get_devchain(pc, buf, sizeof(buf));
+	return sysfs_devchain_is_removable(chain);
+}
+
+int sysfs_blkdev_is_removable(struct path_cxt *pc)
+{
+	int rc = 0;
+
+	// FIXME usb is not actually removable
+
+	/* check /sys/dev/block/<maj>:<min>/removable attribute */
+	if (ul_path_read_s32(pc, &rc, "removable") == 0)
+		return rc;
+
+	return 0;
+}
+
+static int get_dm_wholedisk(struct path_cxt *pc, char *diskname,
+                size_t len, dev_t *diskdevno)
+{
+    int rc = 0;
+    char *name;
+
+    /* Note, sysfs_blkdev_get_slave() returns the first slave only,
+     * if there is more slaves, then return NULL
+     */
+    name = sysfs_blkdev_get_slave(pc);
+    if (!name)
+        return -1;
+
+    if (diskname && len)
+        xstrncpy(diskname, name, len);
+
+    if (diskdevno) {
+        *diskdevno = __sysfs_devname_to_devno(ul_path_get_prefix(pc), name, NULL);
+        if (!*diskdevno)
+            rc = -1;
+    }
+
+    free(name);
+    return rc;
+}
+
+/*
+ * Returns by @diskdevno whole disk device devno and (optionally) by
+ * @diskname the whole disk device name.
+ */
+int sysfs_blkdev_get_wholedisk(	struct path_cxt *pc,
+				char *diskname,
+				size_t len,
+				dev_t *diskdevno)
+{
+    int is_part = 0;
+
+    if (!pc)
+        return -1;
+
+    is_part = ul_path_access(pc, F_OK, "partition") == 0;
+    if (!is_part) {
+        /*
+         * Extra case for partitions mapped by device-mapper.
+         *
+         * All regular partitions (added by BLKPG ioctl or kernel PT
+         * parser) have the /sys/.../partition file. The partitions
+         * mapped by DM don't have such file, but they have "part"
+         * prefix in DM UUID.
+         */
+        char *uuid = NULL, *tmp, *prefix;
+
+	ul_path_read_string(pc, &uuid, "dm/uuid");
+	tmp = uuid;
+	prefix = uuid ? strsep(&tmp, "-") : NULL;
+
+        if (prefix && strncasecmp(prefix, "part", 4) == 0)
+            is_part = 1;
+        free(uuid);
+
+        if (is_part &&
+            get_dm_wholedisk(pc, diskname, len, diskdevno) == 0)
+            /*
+             * partitioned device, mapped by DM
+             */
+            goto done;
+
+        is_part = 0;
+    }
+
+    if (!is_part) {
+        /*
+         * unpartitioned device
+         */
+        if (diskname && !sysfs_blkdev_get_name(pc, diskname, len))
+            goto err;
+        if (diskdevno)
+            *diskdevno = sysfs_blkdev_get_devno(pc);
+
+    } else {
+        /*
+         * partitioned device
+         *  - readlink /sys/dev/block/8:1   = ../../block/sda/sda1
+         *  - dirname  ../../block/sda/sda1 = ../../block/sda
+         *  - basename ../../block/sda      = sda
+         */
+        char linkpath[PATH_MAX];
+        char *name;
+	ssize_t	linklen;
+
+	linklen = ul_path_readlink(pc, linkpath, sizeof(linkpath), NULL);
+        if (linklen < 0)
+            goto err;
+
+        stripoff_last_component(linkpath);      /* dirname */
+        name = stripoff_last_component(linkpath);   /* basename */
+        if (!name)
+            goto err;
+
+	sysfs_devname_sys_to_dev(name);
+        if (diskname && len)
+            xstrncpy(diskname, name, len);
+
+        if (diskdevno) {
+            *diskdevno = __sysfs_devname_to_devno(ul_path_get_prefix(pc), name, NULL);
+            if (!*diskdevno)
+                goto err;
+        }
+    }
+
+done:
+    return 0;
+err:
+    return -1;
+}
+
+int sysfs_devno_to_wholedisk(dev_t devno, char *diskname,
+		             size_t len, dev_t *diskdevno)
+{
+	struct path_cxt *pc;
+	int rc = 0;
+
+	if (!devno)
+		return -EINVAL;
+	pc = ul_new_sysfs_path(devno, NULL, NULL);
+	if (!pc)
+		return -ENOMEM;
+
+	rc = sysfs_blkdev_get_wholedisk(pc, diskname, len, diskdevno);
+	ul_unref_path(pc);
+	return rc;
+}
+
+/*
+ * Returns 1 if the device is private device mapper device. The @uuid
+ * (if not NULL) returns DM device UUID, use free() to deallocate.
+ */
+int sysfs_devno_is_dm_private(dev_t devno, char **uuid)
+{
+	struct path_cxt *pc = NULL;
+	char *id = NULL;
+	int rc = 0;
+
+	pc = ul_new_sysfs_path(devno, NULL, NULL);
+	if (!pc)
+		goto done;
+	if (ul_path_read_string(pc, &id, "dm/uuid") <= 0 || !id)
+		goto done;
+
+	/* Private LVM devices use "LVM-<uuid>-<name>" uuid format (important
+	 * is the "LVM" prefix and "-<name>" postfix).
+	 */
+	if (strncmp(id, "LVM-", 4) == 0) {
+		char *p = strrchr(id + 4, '-');
+
+		if (p && *(p + 1))
+			rc = 1;
+
+	/* Private Stratis devices prefix the UUID with "stratis-1-private"
+	 */
+	} else if (strncmp(id, "stratis-1-private", 17) == 0) {
+		rc = 1;
+	}
+done:
+	ul_unref_path(pc);
+	if (uuid)
+		*uuid = id;
+	else
+		free(id);
+	return rc;
+}
+
+/*
+ * Return 0 or 1, or < 0 in case of error
+ */
+int sysfs_devno_is_wholedisk(dev_t devno)
+{
+	dev_t disk;
+
+	if (sysfs_devno_to_wholedisk(devno, NULL, 0, &disk) != 0)
+		return -1;
+
+	return devno == disk;
+}
+
+
+int sysfs_blkdev_scsi_get_hctl(struct path_cxt *pc, int *h, int *c, int *t, int *l)
+{
+	char buf[PATH_MAX], *hctl;
+	struct sysfs_blkdev *blk;
+	ssize_t len;
+
+	blk = ul_path_get_dialect(pc);
+
+	if (!blk || blk->hctl_error)
+		return -EINVAL;
+	if (blk->has_hctl)
+		goto done;
+
+	blk->hctl_error = 1;
+	len = ul_path_readlink(pc, buf, sizeof(buf), "device");
+	if (len < 0)
+		return len;
+
+	hctl = strrchr(buf, '/');
+	if (!hctl)
+		return -1;
+	hctl++;
+
+	if (sscanf(hctl, "%u:%u:%u:%u",	&blk->scsi_host, &blk->scsi_channel,
+				&blk->scsi_target, &blk->scsi_lun) != 4)
+		return -1;
+
+	blk->has_hctl = 1;
+done:
+	if (h)
+		*h = blk->scsi_host;
+	if (c)
+		*c = blk->scsi_channel;
+	if (t)
+		*t = blk->scsi_target;
+	if (l)
+		*l = blk->scsi_lun;
+
+	blk->hctl_error = 0;
+	return 0;
+}
+
+
+static char *scsi_host_attribute_path(
+			struct path_cxt *pc,
+			const char *type,
+			char *buf,
+			size_t bufsz,
+			const char *attr)
+{
+	int len;
+	int host;
+	const char *prefix;
+
+	if (sysfs_blkdev_scsi_get_hctl(pc, &host, NULL, NULL, NULL))
+		return NULL;
+
+	prefix = ul_path_get_prefix(pc);
+	if (!prefix)
+		prefix = "";
+
+	if (attr)
+		len = snprintf(buf, bufsz, "%s%s/%s_host/host%d/%s",
+				prefix, _PATH_SYS_CLASS, type, host, attr);
+	else
+		len = snprintf(buf, bufsz, "%s%s/%s_host/host%d",
+				prefix, _PATH_SYS_CLASS, type, host);
+
+	return (len < 0 || (size_t) len >= bufsz) ? NULL : buf;
+}
+
+char *sysfs_blkdev_scsi_host_strdup_attribute(struct path_cxt *pc,
+			const char *type, const char *attr)
+{
+	char buf[1024];
+	int rc;
+	FILE *f;
+
+	if (!attr || !type ||
+	    !scsi_host_attribute_path(pc, type, buf, sizeof(buf), attr))
+		return NULL;
+
+	if (!(f = fopen(buf, "r" UL_CLOEXECSTR)))
+                return NULL;
+
+	rc = fscanf(f, "%1023[^\n]", buf);
+	fclose(f);
+
+	return rc == 1 ? strdup(buf) : NULL;
+}
+
+int sysfs_blkdev_scsi_host_is(struct path_cxt *pc, const char *type)
+{
+	char buf[PATH_MAX];
+	struct stat st;
+
+	if (!type || !scsi_host_attribute_path(pc, type,
+				buf, sizeof(buf), NULL))
+		return 0;
+
+	return stat(buf, &st) == 0 && S_ISDIR(st.st_mode);
+}
+
+static char *scsi_attribute_path(struct path_cxt *pc,
+		char *buf, size_t bufsz, const char *attr)
+{
+	int len, h, c, t, l;
+	const char *prefix;
+
+	if (sysfs_blkdev_scsi_get_hctl(pc, &h, &c, &t, &l) != 0)
+		return NULL;
+
+	prefix = ul_path_get_prefix(pc);
+	if (!prefix)
+		prefix = "";
+
+	if (attr)
+		len = snprintf(buf, bufsz, "%s%s/devices/%d:%d:%d:%d/%s",
+				prefix, _PATH_SYS_SCSI,
+				h,c,t,l, attr);
+	else
+		len = snprintf(buf, bufsz, "%s%s/devices/%d:%d:%d:%d",
+				prefix, _PATH_SYS_SCSI,
+				h,c,t,l);
+	return (len < 0 || (size_t) len >= bufsz) ? NULL : buf;
+}
+
+int sysfs_blkdev_scsi_has_attribute(struct path_cxt *pc, const char *attr)
+{
+	char path[PATH_MAX];
+	struct stat st;
+
+	if (!scsi_attribute_path(pc, path, sizeof(path), attr))
+		return 0;
+
+	return stat(path, &st) == 0;
+}
+
+int sysfs_blkdev_scsi_path_contains(struct path_cxt *pc, const char *pattern)
+{
+	char path[PATH_MAX], linkc[PATH_MAX];
+	struct stat st;
+	ssize_t len;
+
+	if (!scsi_attribute_path(pc, path, sizeof(path), NULL))
+		return 0;
+
+	if (stat(path, &st) != 0)
+		return 0;
+
+	len = readlink(path, linkc, sizeof(linkc) - 1);
+	if (len < 0)
+		return 0;
+
+	linkc[len] = '\0';
+	return strstr(linkc, pattern) != NULL;
+}
+
+static dev_t read_devno(const char *path)
+{
+	FILE *f;
+	int maj = 0, min = 0;
+	dev_t dev = 0;
+
+	f = fopen(path, "r" UL_CLOEXECSTR);
+	if (!f)
+		return 0;
+
+	if (fscanf(f, "%d:%d", &maj, &min) == 2)
+		dev = makedev(maj, min);
+	fclose(f);
+	return dev;
+}
+
+int sysfs_devname_is_hidden(const char *prefix, const char *name)
+{
+	char buf[PATH_MAX];
+	int rc = 0, hidden = 0, len;
+	FILE *f;
+
+	if (strncmp("/dev/", name, 5) == 0)
+		return 0;
+
+	if (!prefix)
+		prefix = "";
+	/*
+	 * Create path to /sys/block/<name>/hidden
+	 */
+	len = snprintf(buf, sizeof(buf),
+			"%s" _PATH_SYS_BLOCK "/%s/hidden",
+			prefix, name);
+
+	if (len < 0 || (size_t) len + 1 > sizeof(buf))
+		return 0;
+
+	f = fopen(buf, "r" UL_CLOEXECSTR);
+	if (!f)
+		return 0;
+
+	rc = fscanf(f, "%d", &hidden);
+	fclose(f);
+
+	return rc == 1 ? hidden : 0;
+}
+
+
+dev_t __sysfs_devname_to_devno(const char *prefix, const char *name, const char *parent)
+{
+	char buf[PATH_MAX];
+	char *_name = NULL, *_parent = NULL;	/* name as encoded in sysfs */
+	dev_t dev = 0;
+	int len;
+
+	if (!prefix)
+		prefix = "";
+
+	assert(name);
+
+	if (strncmp("/dev/", name, 5) == 0) {
+		/*
+		 * Read from /dev
+		 */
+		struct stat st;
+
+		if (stat(name, &st) == 0) {
+			dev = st.st_rdev;
+			goto done;
+		}
+		name += 5;	/* unaccessible, or not node in /dev */
+	}
+
+	_name = strdup(name);
+	if (!_name)
+		goto done;
+	sysfs_devname_dev_to_sys(_name);
+
+	if (parent) {
+		_parent = strdup(parent);
+		if (!_parent)
+			goto done;
+	}
+
+	if (parent && strncmp("dm-", name, 3) != 0) {
+		/*
+		 * Create path to /sys/block/<parent>/<name>/dev
+		 */
+		sysfs_devname_dev_to_sys(_parent);
+		len = snprintf(buf, sizeof(buf),
+				"%s" _PATH_SYS_BLOCK "/%s/%s/dev",
+				prefix,	_parent, _name);
+		if (len < 0 || (size_t) len >= sizeof(buf))
+			goto done;
+
+		/* don't try anything else for dm-* */
+		dev = read_devno(buf);
+		goto done;
+	}
+
+	/*
+	 * Read from /sys/block/<sysname>/dev
+	 */
+	len = snprintf(buf, sizeof(buf),
+			"%s" _PATH_SYS_BLOCK "/%s/dev",
+			prefix, _name);
+	if (len < 0 || (size_t) len >= sizeof(buf))
+		goto done;
+	dev = read_devno(buf);
+
+	/*
+	 * Read from /sys/block/<parent>/<partition>/dev
+	 */
+	if (!dev && parent && startswith(name, parent)) {
+		len = snprintf(buf, sizeof(buf),
+				"%s" _PATH_SYS_BLOCK "/%s/%s/dev",
+				prefix, _parent, _name);
+		if (len < 0 || (size_t) len >= sizeof(buf))
+			goto done;
+		dev = read_devno(buf);
+	}
+
+	/*
+	 * Read from /sys/block/<sysname>/device/dev
+	 */
+	if (!dev) {
+		len = snprintf(buf, sizeof(buf),
+				"%s" _PATH_SYS_BLOCK "/%s/device/dev",
+				prefix, _name);
+		if (len < 0 || (size_t) len >= sizeof(buf))
+			goto done;
+		dev = read_devno(buf);
+	}
+done:
+	free(_name);
+	free(_parent);
+	return dev;
+}
+
+dev_t sysfs_devname_to_devno(const char *name)
+{
+	return __sysfs_devname_to_devno(NULL, name, NULL);
+}
+
+char *sysfs_blkdev_get_path(struct path_cxt *pc, char *buf, size_t bufsiz)
+{
+	const char *name = sysfs_blkdev_get_name(pc, buf, bufsiz);
+	char *res = NULL;
+	size_t sz;
+	struct stat st;
+
+	if (!name)
+		goto done;
+
+	sz = strlen(name);
+	if (sz + sizeof("/dev/") > bufsiz)
+		goto done;
+
+	/* create the final "/dev/<name>" string */
+	memmove(buf + 5, name, sz + 1);
+	memcpy(buf, "/dev/", 5);
+
+	if (!stat(buf, &st) && S_ISBLK(st.st_mode) && st.st_rdev == sysfs_blkdev_get_devno(pc))
+		res = buf;
+done:
+	return res;
+}
+
+dev_t sysfs_blkdev_get_devno(struct path_cxt *pc)
+{
+	return ((struct sysfs_blkdev *) ul_path_get_dialect(pc))->devno;
+}
+
+/*
+ * Returns devname (e.g. "/dev/sda1") for the given devno.
+ *
+ * Please, use more robust blkid_devno_to_devname() in your applications.
+ */
+char *sysfs_devno_to_devpath(dev_t devno, char *buf, size_t bufsiz)
+{
+	struct path_cxt *pc = ul_new_sysfs_path(devno, NULL, NULL);
+	char *res = NULL;
+
+	if (pc) {
+		res = sysfs_blkdev_get_path(pc, buf, bufsiz);
+		ul_unref_path(pc);
+	}
+	return res;
+}
+
+char *sysfs_devno_to_devname(dev_t devno, char *buf, size_t bufsiz)
+{
+	struct path_cxt *pc = ul_new_sysfs_path(devno, NULL, NULL);
+	char *res = NULL;
+
+	if (pc) {
+		res = sysfs_blkdev_get_name(pc, buf, bufsiz);
+		ul_unref_path(pc);
+	}
+	return res;
+}
+
+int sysfs_devno_count_partitions(dev_t devno)
+{
+	struct path_cxt *pc = ul_new_sysfs_path(devno, NULL, NULL);
+	int n = 0;
+
+	if (pc) {
+		char buf[PATH_MAX + 1];
+		char *name = sysfs_blkdev_get_name(pc, buf, sizeof(buf));
+
+		n = sysfs_blkdev_count_partitions(pc, name);
+		ul_unref_path(pc);
+	}
+	return n;
+}
+
+char *sysfs_chrdev_devno_to_devname(dev_t devno, char *buf, size_t bufsiz)
+{
+	char link[PATH_MAX];
+	struct path_cxt *pc;
+	char *name;
+	ssize_t	sz;
+
+	pc = ul_new_path(_PATH_SYS_DEVCHAR "/%u:%u", major(devno), minor(devno));
+	if (!pc)
+		return NULL;
+
+        /* read /sys/dev/char/<maj:min> link */
+	sz = ul_path_readlink(pc, link, sizeof(link), NULL);
+	ul_unref_path(pc);
+
+	if (sz < 0)
+		return NULL;
+
+	name = strrchr(link, '/');
+	if (!name)
+		return NULL;
+
+	name++;
+	sz = strlen(name);
+	if ((size_t) sz + 1 > bufsiz)
+		return NULL;
+
+	memcpy(buf, name, sz + 1);
+	sysfs_devname_sys_to_dev(buf);
+	return buf;
+
+}
+
+enum sysfs_byteorder sysfs_get_byteorder(struct path_cxt *pc)
+{
+	int rc;
+	char buf[BUFSIZ];
+	enum sysfs_byteorder ret;
+
+	rc = ul_path_read_buffer(pc, buf, sizeof(buf), _PATH_SYS_CPU_BYTEORDER);
+	if (rc < 0)
+		goto unknown;
+
+	if (strncmp(buf, "little", sizeof(buf)) == 0) {
+		ret = SYSFS_BYTEORDER_LITTLE;
+		goto out;
+	} else if (strncmp(buf, "big", sizeof(buf)) == 0) {
+		ret = SYSFS_BYTEORDER_BIG;
+		goto out;
+	}
+
+unknown:
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+	ret = SYSFS_BYTEORDER_LITTLE;
+#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+	ret = SYSFS_BYTEORDER_BIG;
+#else
+#error Unknown byte order
+#endif
+
+out:
+	return ret;
+}
+
+int sysfs_get_address_bits(struct path_cxt *pc)
+{
+	int rc;
+	int address_bits;
+
+	rc = ul_path_scanf(pc, _PATH_SYS_ADDRESS_BITS, "%d", &address_bits);
+	if (rc < 0)
+		return rc;
+	if (address_bits < 0)
+		return -EINVAL;
+	return address_bits;
+}
+
+
+#ifdef TEST_PROGRAM_SYSFS
+#include <errno.h>
+#include <err.h>
+#include <stdlib.h>
+
+int main(int argc, char *argv[])
+{
+	struct path_cxt *pc;
+	char *devname;
+	dev_t devno, disk_devno;
+	char path[PATH_MAX], *sub, *chain;
+	char diskname[32];
+	int i, is_part, rc = EXIT_SUCCESS;
+	uint64_t u64;
+
+	if (argc != 2)
+		errx(EXIT_FAILURE, "usage: %s <devname>", argv[0]);
+
+	ul_sysfs_init_debug();
+
+	devname = argv[1];
+	devno = sysfs_devname_to_devno(devname);
+
+	if (!devno)
+		err(EXIT_FAILURE, "failed to read devno");
+
+	printf("non-context:\n");
+	printf(" DEVNO:   %u (%d:%d)\n", (unsigned int) devno, major(devno), minor(devno));
+	printf(" DEVNAME: %s\n", sysfs_devno_to_devname(devno, path, sizeof(path)));
+	printf(" DEVPATH: %s\n", sysfs_devno_to_devpath(devno, path, sizeof(path)));
+
+	sysfs_devno_to_wholedisk(devno, diskname, sizeof(diskname), &disk_devno);
+	printf(" WHOLEDISK-DEVNO:   %u (%d:%d)\n", (unsigned int) disk_devno, major(disk_devno), minor(disk_devno));
+	printf(" WHOLEDISK-DEVNAME: %s\n", diskname);
+
+	pc = ul_new_sysfs_path(devno, NULL, NULL);
+	if (!pc)
+		goto done;
+
+	printf("context based:\n");
+	devno = sysfs_blkdev_get_devno(pc);
+	printf(" DEVNO:   %u (%d:%d)\n", (unsigned int) devno, major(devno), minor(devno));
+	printf(" DEVNAME: %s\n", sysfs_blkdev_get_name(pc, path, sizeof(path)));
+	printf(" DEVPATH: %s\n", sysfs_blkdev_get_path(pc, path, sizeof(path)));
+
+	sysfs_devno_to_wholedisk(devno, diskname, sizeof(diskname), &disk_devno);
+	printf(" WHOLEDISK-DEVNO: %u (%d:%d)\n", (unsigned int) disk_devno, major(disk_devno), minor(disk_devno));
+	printf(" WHOLEDISK-DEVNAME: %s\n", diskname);
+
+	is_part = ul_path_access(pc, F_OK, "partition") == 0;
+	printf(" PARTITION: %s\n", is_part ? "YES" : "NOT");
+
+	if (is_part && disk_devno) {
+		struct path_cxt *disk_pc =  ul_new_sysfs_path(disk_devno, NULL, NULL);
+		sysfs_blkdev_set_parent(pc, disk_pc);
+
+		ul_unref_path(disk_pc);
+	}
+
+	printf(" HOTPLUG: %s\n", sysfs_blkdev_is_hotpluggable(pc) ? "yes" : "no");
+	printf(" REMOVABLE: %s\n", sysfs_blkdev_is_removable(pc) ? "yes" : "no");
+	printf(" SLAVES: %d\n", ul_path_count_dirents(pc, "slaves"));
+
+	if (!is_part) {
+		printf("First 5 partitions:\n");
+		for (i = 1; i <= 5; i++) {
+			dev_t dev = sysfs_blkdev_partno_to_devno(pc, i);
+			if (dev)
+				printf("\t#%d %d:%d\n", i, major(dev), minor(dev));
+		}
+	}
+
+	if (ul_path_read_u64(pc, &u64, "size") != 0)
+		printf(" (!) read SIZE failed\n");
+	else
+		printf(" SIZE: %jd\n", u64);
+
+	if (ul_path_read_s32(pc, &i, "queue/hw_sector_size"))
+		printf(" (!) read SECTOR failed\n");
+	else
+		printf(" SECTOR: %d\n", i);
+
+
+	chain = sysfs_blkdev_get_devchain(pc, path, sizeof(path));
+	printf(" SUBSYSTEMS:\n");
+
+	while (chain && sysfs_blkdev_next_subsystem(pc, chain, &sub) == 0) {
+		printf("\t%s\n", sub);
+		free(sub);
+	}
+
+	rc = EXIT_SUCCESS;
+done:
+	ul_unref_path(pc);
+	return rc;
+}
+#endif /* TEST_PROGRAM_SYSFS */
diff --git a/lib/terminal-colors.d.5 b/lib/terminal-colors.d.5
new file mode 100644
index 0000000..4b98389
--- /dev/null
+++ b/lib/terminal-colors.d.5
@@ -0,0 +1,404 @@
+'\" t
+.\"     Title: terminal-colors.d
+.\"    Author: [see the "AUTHOR(S)" section]
+.\" Generator: Asciidoctor 2.0.20
+.\"      Date: 2023-10-23
+.\"    Manual: File formats
+.\"    Source: util-linux 2.39.3
+.\"  Language: English
+.\"
+.TH "TERMINAL\-COLORS.D" "5" "2023-10-23" "util\-linux 2.39.3" "File formats"
+.ie \n(.g .ds Aq \(aq
+.el       .ds Aq '
+.ss \n[.ss] 0
+.nh
+.ad l
+.de URL
+\fI\\$2\fP <\\$1>\\$3
+..
+.als MTO URL
+.if \n[.g] \{\
+.  mso www.tmac
+.  am URL
+.    ad l
+.  .
+.  am MTO
+.    ad l
+.  .
+.  LINKSTYLE blue R < >
+.\}
+.SH "NAME"
+terminal-colors.d \- configure output colorization for various utilities
+.SH "SYNOPSIS"
+.sp
+/etc/terminal\-colors.d/\fI[[name][@term].][type]\fP
+.SH "DESCRIPTION"
+.sp
+Files in this directory determine the default behavior for utilities when coloring output.
+.sp
+The \fIname\fP is a utility name. The name is optional and when none is specified then the file is used for all unspecified utilities.
+.sp
+The \fIterm\fP is a terminal identifier (the \fBTERM\fP environment variable). The terminal identifier is optional and when none is specified then the file is used for all unspecified terminals.
+.sp
+The \fItype\fP is a file type. Supported file types are:
+.sp
+\fBdisable\fP
+.RS 4
+Turns off output colorization for all compatible utilities.
+.RE
+.sp
+\fBenable\fP
+.RS 4
+Turns on output colorization; any matching \fBdisable\fP files are ignored.
+.RE
+.sp
+\fBscheme\fP
+.RS 4
+Specifies colors used for output. The file format may be specific to the utility, the default format is described below.
+.RE
+.sp
+If there are more files that match for a utility, then the file with the more specific filename wins. For example, the filename "@xterm.scheme" has less priority than "dmesg@xterm.scheme". The lowest priority are those files without a utility name and terminal identifier (e.g., "disable").
+.sp
+The user\-specific \fI$XDG_CONFIG_HOME/terminal\-colors.d\fP or \fI$HOME/.config/terminal\-colors.d\fP overrides the global setting.
+.SH "DEFAULT SCHEME FILES FORMAT"
+.sp
+The following statement is recognized:
+.RS 3
+.ll -.6i
+.sp
+\fBname color\-sequence\fP
+.br
+.RE
+.ll
+.sp
+The \fBname\fP is a logical name of color sequence (for example "error"). The names are specific to the utilities. For more details always see the \fBCOLORS\fP section in the man page for the utility.
+.sp
+The \fBcolor\-sequence\fP is a color name, ASCII color sequences or escape sequences.
+.SS "Color names"
+.sp
+black, blink, blue, bold, brown, cyan, darkgray, gray, green, halfbright, lightblue, lightcyan, lightgray, lightgreen, lightmagenta, lightred, magenta, red, reset, reverse, and yellow.
+.SS "ANSI color sequences"
+.sp
+The color sequences are composed of sequences of numbers separated by semicolons. The most common codes are:
+.RS 3
+.ll -.6i
+.TS
+allbox tab(:);
+lt lt.
+T{
+.sp
+0
+T}:T{
+.sp
+to restore default color
+T}
+T{
+.sp
+1
+T}:T{
+.sp
+for brighter colors
+T}
+T{
+.sp
+4
+T}:T{
+.sp
+for underlined text
+T}
+T{
+.sp
+5
+T}:T{
+.sp
+for flashing text
+T}
+T{
+.sp
+30
+T}:T{
+.sp
+for black foreground
+T}
+T{
+.sp
+31
+T}:T{
+.sp
+for red foreground
+T}
+T{
+.sp
+32
+T}:T{
+.sp
+for green foreground
+T}
+T{
+.sp
+33
+T}:T{
+.sp
+for yellow (or brown) foreground
+T}
+T{
+.sp
+34
+T}:T{
+.sp
+for blue foreground
+T}
+T{
+.sp
+35
+T}:T{
+.sp
+for purple foreground
+T}
+T{
+.sp
+36
+T}:T{
+.sp
+for cyan foreground
+T}
+T{
+.sp
+37
+T}:T{
+.sp
+for white (or gray) foreground
+T}
+T{
+.sp
+40
+T}:T{
+.sp
+for black background
+T}
+T{
+.sp
+41
+T}:T{
+.sp
+for red background
+T}
+T{
+.sp
+42
+T}:T{
+.sp
+for green background
+T}
+T{
+.sp
+43
+T}:T{
+.sp
+for yellow (or brown) background
+T}
+T{
+.sp
+44
+T}:T{
+.sp
+for blue background
+T}
+T{
+.sp
+45
+T}:T{
+.sp
+for purple background
+T}
+T{
+.sp
+46
+T}:T{
+.sp
+for cyan background
+T}
+T{
+.sp
+47
+T}:T{
+.sp
+for white (or gray) background
+T}
+.TE
+.sp
+.br
+.RE
+.ll
+.SS "Escape sequences"
+.sp
+To specify control or blank characters in the color sequences, C\-style \(rs\-escaped notation can be used:
+.RS 3
+.ll -.6i
+.TS
+allbox tab(:);
+lt lt.
+T{
+.sp
+\fB\(rsa\fP
+T}:T{
+.sp
+Bell (ASCII 7)
+T}
+T{
+.sp
+\fB\(rsb\fP
+T}:T{
+.sp
+Backspace (ASCII 8)
+T}
+T{
+.sp
+\fB\(rse\fP
+T}:T{
+.sp
+Escape (ASCII 27)
+T}
+T{
+.sp
+\fB\(rsf\fP
+T}:T{
+.sp
+Form feed (ASCII 12)
+T}
+T{
+.sp
+\fB\(rsn\fP
+T}:T{
+.sp
+Newline (ASCII 10)
+T}
+T{
+.sp
+\fB\(rsr\fP
+T}:T{
+.sp
+Carriage Return (ASCII 13)
+T}
+T{
+.sp
+\fB\(rst\fP
+T}:T{
+.sp
+Tab (ASCII 9)
+T}
+T{
+.sp
+\fB\(rsv\fP
+T}:T{
+.sp
+Vertical Tab (ASCII 11)
+T}
+T{
+.sp
+\fB\(rs?\fP
+T}:T{
+.sp
+Delete (ASCII 127)
+T}
+T{
+.sp
+\fB\(rs_\fP
+T}:T{
+.sp
+Space
+T}
+T{
+.sp
+\fB\(rs\(rs\fP
+T}:T{
+.sp
+Backslash (\(rs)
+T}
+T{
+.sp
+\fB\(rs^\fP
+T}:T{
+.sp
+Caret (^)
+T}
+T{
+.sp
+\fB\(rs#\fP
+T}:T{
+.sp
+Hash mark (#)
+T}
+.TE
+.sp
+.br
+.RE
+.ll
+.sp
+Please note that escapes are necessary to enter a space, backslash, caret, or any control character anywhere in the string, as well as a hash mark as the first character.
+.sp
+For example, to use a red background for alert messages in the output of \fBdmesg\fP(1), use:
+.RS 3
+.ll -.6i
+.sp
+\fBecho \*(Aqalert 37;41\*(Aq >> /etc/terminal\-colors.d/dmesg.scheme\fP
+.br
+.RE
+.ll
+.SS "Comments"
+.sp
+Lines where the first non\-blank character is a # (hash) are ignored. Any other use of the hash character is not interpreted as introducing a comment.
+.SH "ENVIRONMENT"
+.sp
+\fBTERMINAL_COLORS_DEBUG\fP=all
+.RS 4
+enables debug output.
+.RE
+.SH "FILES"
+.sp
+\fI$XDG_CONFIG_HOME/terminal\-colors.d\fP
+.sp
+\fI$HOME/.config/terminal\-colors.d\fP
+.sp
+\fI/etc/terminal\-colors.d\fP
+.SH "EXAMPLE"
+.sp
+Disable colors for all compatible utilities:
+.RS 3
+.ll -.6i
+.sp
+\fBtouch /etc/terminal\-colors.d/disable\fP
+.br
+.RE
+.ll
+.sp
+Disable colors for all compatible utils on a vt100 terminal:
+.RS 3
+.ll -.6i
+.sp
+\fBtouch /etc/terminal\-colors.d/@vt100.disable\fP
+.br
+.RE
+.ll
+.sp
+Disable colors for all compatible utils except \fBdmesg\fP(1):
+.RS 3
+.ll -.6i
+.sp
+\fBtouch /etc/terminal\-colors.d/disable\fP
+.sp
+\fBtouch /etc/terminal\-colors.d/dmesg.enable\fP
+.br
+.RE
+.ll
+.SH "COMPATIBILITY"
+.sp
+The \fBterminal\-colors.d\fP functionality is currently supported by all util\-linux utilities which provides colorized output. For more details always see the \fBCOLORS\fP section in the man page for the utility.
+.SH "REPORTING BUGS"
+.sp
+For bug reports, use the issue tracker at \c
+.URL "https://github.com/util\-linux/util\-linux/issues" "" "."
+.SH "AVAILABILITY"
+.sp
+\fBterminal\-colors.d\fP is part of the util\-linux package which can be downloaded from \c
+.URL "https://www.kernel.org/pub/linux/utils/util\-linux/" "Linux Kernel Archive" "."
\ No newline at end of file
diff --git a/lib/terminal-colors.d.5.adoc b/lib/terminal-colors.d.5.adoc
new file mode 100644
index 0000000..f09cce1
--- /dev/null
+++ b/lib/terminal-colors.d.5.adoc
@@ -0,0 +1,174 @@
+//po4a: entry man manual
+////
+terminal-colors.d.5 --
+Copyright 2014 Ondrej Oprala <ooprala@redhat.com>
+Copyright (C) 2014 Karel Zak <kzak@redhat.com>
+Copyright 2014 Red Hat, Inc.
+May be distributed under the GNU General Public License
+////
+
+= terminal-colors.d(5)
+:doctype: manpage
+:man manual: File formats
+:man source: util-linux {release-version}
+:page-layout: base
+:configfile: terminal-colors.d
+
+== NAME
+
+terminal-colors.d - configure output colorization for various utilities
+
+== SYNOPSIS
+
+/etc/terminal-colors.d/_[[name][@term].][type]_
+
+== DESCRIPTION
+
+Files in this directory determine the default behavior for utilities when coloring output.
+
+The _name_ is a utility name. The name is optional and when none is specified then the file is used for all unspecified utilities.
+
+The _term_ is a terminal identifier (the *TERM* environment variable). The terminal identifier is optional and when none is specified then the file is used for all unspecified terminals.
+
+The _type_ is a file type. Supported file types are:
+
+*disable*::
+Turns off output colorization for all compatible utilities.
+
+*enable*::
+Turns on output colorization; any matching *disable* files are ignored.
+
+*scheme*::
+Specifies colors used for output. The file format may be specific to the utility, the default format is described below.
+
+If there are more files that match for a utility, then the file with the more specific filename wins. For example, the filename "@xterm.scheme" has less priority than "dmesg@xterm.scheme". The lowest priority are those files without a utility name and terminal identifier (e.g., "disable").
+
+The user-specific _$XDG_CONFIG_HOME/terminal-colors.d_ or _$HOME/.config/terminal-colors.d_ overrides the global setting.
+
+== DEFAULT SCHEME FILES FORMAT
+
+The following statement is recognized:
+
+____
+*name color-sequence*
+____
+
+The *name* is a logical name of color sequence (for example "error"). The names are specific to the utilities. For more details always see the *COLORS* section in the man page for the utility.
+
+The *color-sequence* is a color name, ASCII color sequences or escape sequences.
+
+=== Color names
+
+black, blink, blue, bold, brown, cyan, darkgray, gray, green, halfbright, lightblue, lightcyan, lightgray, lightgreen, lightmagenta, lightred, magenta, red, reset, reverse, and yellow.
+
+=== ANSI color sequences
+
+The color sequences are composed of sequences of numbers separated by semicolons. The most common codes are:
+
+____
+[cols=",",]
+|===
+|0 |to restore default color
+|1 |for brighter colors
+|4 |for underlined text
+|5 |for flashing text
+|30 |for black foreground
+|31 |for red foreground
+|32 |for green foreground
+|33 |for yellow (or brown) foreground
+|34 |for blue foreground
+|35 |for purple foreground
+|36 |for cyan foreground
+|37 |for white (or gray) foreground
+|40 |for black background
+|41 |for red background
+|42 |for green background
+|43 |for yellow (or brown) background
+|44 |for blue background
+|45 |for purple background
+|46 |for cyan background
+|47 |for white (or gray) background
+|===
+____
+
+=== Escape sequences
+
+To specify control or blank characters in the color sequences, C-style \-escaped notation can be used:
+
+____
+[cols=",",]
+|===
+|*\a* |Bell (ASCII 7)
+|*\b* |Backspace (ASCII 8)
+|*\e* |Escape (ASCII 27)
+|*\f* |Form feed (ASCII 12)
+|*\n* |Newline (ASCII 10)
+|*\r* |Carriage Return (ASCII 13)
+|*\t* |Tab (ASCII 9)
+|*\v* |Vertical Tab (ASCII 11)
+|*\?* |Delete (ASCII 127)
+|*\_* |Space
+|*\\* |Backslash (\)
+|*\^* |Caret (^)
+|*\#* |Hash mark (#)
+|===
+____
+
+Please note that escapes are necessary to enter a space, backslash, caret, or any control character anywhere in the string, as well as a hash mark as the first character.
+
+For example, to use a red background for alert messages in the output of *dmesg*(1), use:
+
+____
+*echo 'alert 37;41' >> /etc/terminal-colors.d/dmesg.scheme*
+____
+
+=== Comments
+
+Lines where the first non-blank character is a # (hash) are ignored. Any other use of the hash character is not interpreted as introducing a comment.
+
+== ENVIRONMENT
+
+*TERMINAL_COLORS_DEBUG*=all::
+enables debug output.
+
+== FILES
+
+_$XDG_CONFIG_HOME/terminal-colors.d_
+
+_$HOME/.config/terminal-colors.d_
+
+_/etc/terminal-colors.d_
+
+== EXAMPLE
+
+Disable colors for all compatible utilities:
+
+____
+*touch /etc/terminal-colors.d/disable*
+____
+
+Disable colors for all compatible utils on a vt100 terminal:
+
+____
+*touch /etc/terminal-colors.d/@vt100.disable*
+____
+
+Disable colors for all compatible utils except *dmesg*(1):
+
+____
+*touch /etc/terminal-colors.d/disable*
+
+*touch /etc/terminal-colors.d/dmesg.enable*
+____
+
+== COMPATIBILITY
+
+The *terminal-colors.d* functionality is currently supported by all util-linux utilities which provides colorized output. For more details always see the *COLORS* section in the man page for the utility.
+
+include::man-common/bugreports.adoc[]
+
+include::man-common/footer-config.adoc[]
+
+ifdef::translation[]
+include::man-common/translation.adoc[]
+endif::[]
diff --git a/lib/timer.c b/lib/timer.c
new file mode 100644
index 0000000..cfa18f6
--- /dev/null
+++ b/lib/timer.c
@@ -0,0 +1,98 @@
+/*
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Please, don't add this file to libcommon because timers requires
+ * -lrt on systems with old libc (and probably also -lpthread for static
+ *  build).
+ */
+#include <time.h>
+#include <signal.h>
+#include <sys/time.h>
+
+#include "c.h"
+#include "timer.h"
+
+/*
+ * Note the timeout is used for the first signal, then the signal is send
+ * repeatedly in interval ~1% of the original timeout to avoid race in signal
+ * handling -- for example you want to use timer to define timeout for a
+ * syscall:
+ *
+ *	 setup_timer()
+ *	 syscall()
+ *	 cancel_timer()
+ *
+ * if the timeout is too short than it's possible that the signal is delivered
+ * before application enter the syscall function. For this reason timer send
+ * the signal repeatedly.
+ *
+ * The applications need to ensure that they can tolerate multiple signal
+ * deliveries.
+ */
+#ifdef HAVE_TIMER_CREATE
+int setup_timer(struct ul_timer *timer,
+		struct itimerval *timeout,
+		void (*timeout_handler)(int, siginfo_t *, void *))
+{
+	time_t sec = timeout->it_value.tv_sec;
+	long usec = timeout->it_value.tv_usec;
+	struct sigaction sig_a;
+	static struct sigevent sig_e = {
+		.sigev_notify = SIGEV_SIGNAL,
+		.sigev_signo = SIGALRM
+	};
+	struct itimerspec val = {
+		.it_value.tv_sec = sec,
+		.it_value.tv_nsec = usec * 1000,
+		.it_interval.tv_sec = sec / 100,
+		.it_interval.tv_nsec = (sec ? sec % 100 : 1) * 10*1000*1000
+	};
+
+	if (sigemptyset(&sig_a.sa_mask))
+		return 1;
+
+	sig_a.sa_flags = SA_SIGINFO;
+	sig_a.sa_sigaction = timeout_handler;
+
+	if (sigaction(SIGALRM, &sig_a, NULL))
+		return 1;
+	if (timer_create(CLOCK_MONOTONIC, &sig_e, &timer->t_id))
+		return 1;
+	if (timer_settime(timer->t_id, 0, &val, NULL))
+		return 1;
+	return 0;
+}
+void cancel_timer(struct ul_timer *timer)
+{
+	timer_delete(timer->t_id);
+}
+
+#else /* !HAVE_TIMER_CREATE */
+
+int setup_timer(struct ul_timer *timer,
+		struct itimerval *timeout,
+		void (*timeout_handler)(int, siginfo_t *, void *))
+{
+	struct sigaction sa;
+
+	memset(&sa, 0, sizeof sa);
+	memset(timer, 0, sizeof(*timer));
+
+	sa.sa_flags = SA_SIGINFO | SA_RESETHAND;
+	sa.sa_sigaction = timeout_handler;
+
+	if (sigaction(SIGALRM, &sa, &timer->old_sa))
+		return 1;
+	if (setitimer(ITIMER_REAL, timeout, &timer->old_timer) != 0)
+		return 1;
+	return 0;
+}
+
+void cancel_timer(struct ul_timer *timer)
+{
+	setitimer(ITIMER_REAL, &timer->old_timer, NULL);
+        sigaction(SIGALRM, &timer->old_sa, NULL);
+
+}
+#endif /* !HAVE_TIMER_CREATE */
diff --git a/lib/timeutils.c b/lib/timeutils.c
new file mode 100644
index 0000000..34c7c8d
--- /dev/null
+++ b/lib/timeutils.c
@@ -0,0 +1,707 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * First set of functions in this file are part of systemd, and were
+ * copied to util-linux at August 2013.
+ *
+ * Copyright 2010 Lennart Poettering
+ * Copyright (C) 2014 Karel Zak <kzak@redhat.com>
+ *
+ * This is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free
+ * Software Foundation; either version 2.1 of the License, or (at your option)
+ * any later version.
+ */
+#include <assert.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <sys/time.h>
+#include <inttypes.h>
+
+#include "c.h"
+#include "nls.h"
+#include "strutils.h"
+#include "timeutils.h"
+
+#define WHITESPACE " \t\n\r"
+
+#define streq(a,b) (strcmp((a),(b)) == 0)
+
+static int parse_sec(const char *t, usec_t *usec)
+{
+	static const struct {
+		const char *suffix;
+		usec_t usec;
+	} table[] = {
+		{ "seconds",	USEC_PER_SEC },
+		{ "second",	USEC_PER_SEC },
+		{ "sec",	USEC_PER_SEC },
+		{ "s",		USEC_PER_SEC },
+		{ "minutes",	USEC_PER_MINUTE },
+		{ "minute",	USEC_PER_MINUTE },
+		{ "min",	USEC_PER_MINUTE },
+		{ "months",	USEC_PER_MONTH },
+		{ "month",	USEC_PER_MONTH },
+		{ "msec",	USEC_PER_MSEC },
+		{ "ms",		USEC_PER_MSEC },
+		{ "m",		USEC_PER_MINUTE },
+		{ "hours",	USEC_PER_HOUR },
+		{ "hour",	USEC_PER_HOUR },
+		{ "hr",		USEC_PER_HOUR },
+		{ "h",		USEC_PER_HOUR },
+		{ "days",	USEC_PER_DAY },
+		{ "day",	USEC_PER_DAY },
+		{ "d",		USEC_PER_DAY },
+		{ "weeks",	USEC_PER_WEEK },
+		{ "week",	USEC_PER_WEEK },
+		{ "w",		USEC_PER_WEEK },
+		{ "years",	USEC_PER_YEAR },
+		{ "year",	USEC_PER_YEAR },
+		{ "y",		USEC_PER_YEAR },
+		{ "usec",	1ULL },
+		{ "us",		1ULL },
+		{ "",		USEC_PER_SEC },	/* default is sec */
+	};
+
+	const char *p;
+	usec_t r = 0;
+	int something = FALSE;
+
+	assert(t);
+	assert(usec);
+
+	p = t;
+	for (;;) {
+		long long l, z = 0;
+		char *e;
+		unsigned i, n = 0;
+
+		p += strspn(p, WHITESPACE);
+
+		if (*p == 0) {
+			if (!something)
+				return -EINVAL;
+
+			break;
+		}
+
+		errno = 0;
+		l = strtoll(p, &e, 10);
+
+		if (errno > 0)
+			return -errno;
+
+		if (l < 0)
+			return -ERANGE;
+
+		if (*e == '.') {
+			char *b = e + 1;
+
+			errno = 0;
+			z = strtoll(b, &e, 10);
+			if (errno > 0)
+				return -errno;
+
+			if (z < 0)
+				return -ERANGE;
+
+			if (e == b)
+				return -EINVAL;
+
+			n = e - b;
+
+		} else if (e == p)
+			return -EINVAL;
+
+		e += strspn(e, WHITESPACE);
+
+		for (i = 0; i < ARRAY_SIZE(table); i++)
+			if (startswith(e, table[i].suffix)) {
+				usec_t k = (usec_t) z * table[i].usec;
+
+				for (; n > 0; n--)
+					k /= 10;
+
+				r += (usec_t) l *table[i].usec + k;
+				p = e + strlen(table[i].suffix);
+
+				something = TRUE;
+				break;
+			}
+
+		if (i >= ARRAY_SIZE(table))
+			return -EINVAL;
+
+	}
+
+	*usec = r;
+
+	return 0;
+}
+
+static int parse_subseconds(const char *t, usec_t *usec)
+{
+	usec_t ret = 0;
+	int factor = USEC_PER_SEC / 10;
+
+	if (*t != '.' && *t != ',')
+		return -1;
+
+	while (*(++t)) {
+		if (!isdigit(*t) || factor < 1)
+			return -1;
+
+		ret += ((usec_t) *t - '0') * factor;
+		factor /= 10;
+	}
+
+	*usec = ret;
+	return 0;
+}
+
+static int parse_timestamp_reference(time_t x, const char *t, usec_t *usec)
+{
+	static const struct {
+		const char *name;
+		const int nr;
+	} day_nr[] = {
+		{ "Sunday",	0 },
+		{ "Sun",	0 },
+		{ "Monday",	1 },
+		{ "Mon",	1 },
+		{ "Tuesday",	2 },
+		{ "Tue",	2 },
+		{ "Wednesday",	3 },
+		{ "Wed",	3 },
+		{ "Thursday",	4 },
+		{ "Thu",	4 },
+		{ "Friday",	5 },
+		{ "Fri",	5 },
+		{ "Saturday",	6 },
+		{ "Sat",	6 },
+	};
+
+	const char *k;
+	struct tm tm, copy;
+	usec_t plus = 0, minus = 0, ret = 0;
+	int r, weekday = -1;
+	unsigned i;
+
+	/*
+	 * Allowed syntaxes:
+	 *
+	 *   2012-09-22 16:34:22 !
+	 *   2012-09-22T16:34:22 !
+	 *   20120922163422      !
+	 *   @1348331662	 ! (seconds since the Epoch (1970-01-01 00:00 UTC))
+	 *   2012-09-22 16:34	   (seconds will be set to 0)
+	 *   2012-09-22		   (time will be set to 00:00:00)
+	 *   16:34:22		 ! (date will be set to today)
+	 *   16:34		   (date will be set to today, seconds to 0)
+	 *   now
+	 *   yesterday		   (time is set to 00:00:00)
+	 *   today		   (time is set to 00:00:00)
+	 *   tomorrow		   (time is set to 00:00:00)
+	 *   +5min
+	 *   -5days
+	 *
+	 *   Syntaxes marked with '!' also optionally allow up to six digits of
+	 *   subsecond granularity, separated by '.' or ',':
+	 *
+	 *   2012-09-22 16:34:22.12
+	 *   2012-09-22 16:34:22.123456
+	 *
+	 *
+	 */
+
+	assert(t);
+	assert(usec);
+
+	localtime_r(&x, &tm);
+	tm.tm_isdst = -1;
+
+	if (streq(t, "now"))
+		goto finish;
+
+	else if (streq(t, "today")) {
+		tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
+		goto finish;
+
+	} else if (streq(t, "yesterday")) {
+		tm.tm_mday--;
+		tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
+		goto finish;
+
+	} else if (streq(t, "tomorrow")) {
+		tm.tm_mday++;
+		tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
+		goto finish;
+
+	} else if (t[0] == '+') {
+
+		r = parse_sec(t + 1, &plus);
+		if (r < 0)
+			return r;
+
+		goto finish;
+	} else if (t[0] == '-') {
+
+		r = parse_sec(t + 1, &minus);
+		if (r < 0)
+			return r;
+
+		goto finish;
+	} else if (t[0] == '@') {
+		k = strptime(t + 1, "%s", &tm);
+		if (k && *k == 0)
+			goto finish;
+		else if (k && parse_subseconds(k, &ret) == 0)
+			goto finish;
+
+		return -EINVAL;
+	} else if (endswith(t, " ago")) {
+		char *z;
+
+		z = strndup(t, strlen(t) - 4);
+		if (!z)
+			return -ENOMEM;
+
+		r = parse_sec(z, &minus);
+		free(z);
+		if (r < 0)
+			return r;
+
+		goto finish;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(day_nr); i++) {
+		size_t skip;
+
+		if (!startswith_no_case(t, day_nr[i].name))
+			continue;
+
+		skip = strlen(day_nr[i].name);
+		if (t[skip] != ' ')
+			continue;
+
+		weekday = day_nr[i].nr;
+		t += skip + 1;
+		break;
+	}
+
+	copy = tm;
+	k = strptime(t, "%y-%m-%d %H:%M:%S", &tm);
+	if (k && *k == 0)
+		goto finish;
+	else if (k && parse_subseconds(k, &ret) == 0)
+		goto finish;
+
+	tm = copy;
+	k = strptime(t, "%Y-%m-%d %H:%M:%S", &tm);
+	if (k && *k == 0)
+		goto finish;
+	else if (k && parse_subseconds(k, &ret) == 0)
+		goto finish;
+
+	tm = copy;
+	k = strptime(t, "%Y-%m-%dT%H:%M:%S", &tm);
+	if (k && *k == 0)
+		goto finish;
+	else if (k && parse_subseconds(k, &ret) == 0)
+		goto finish;
+
+	tm = copy;
+	k = strptime(t, "%y-%m-%d %H:%M", &tm);
+	if (k && *k == 0) {
+		tm.tm_sec = 0;
+		goto finish;
+	}
+
+	tm = copy;
+	k = strptime(t, "%Y-%m-%d %H:%M", &tm);
+	if (k && *k == 0) {
+		tm.tm_sec = 0;
+		goto finish;
+	}
+
+	tm = copy;
+	k = strptime(t, "%y-%m-%d", &tm);
+	if (k && *k == 0) {
+		tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
+		goto finish;
+	}
+
+	tm = copy;
+	k = strptime(t, "%Y-%m-%d", &tm);
+	if (k && *k == 0) {
+		tm.tm_sec = tm.tm_min = tm.tm_hour = 0;
+		goto finish;
+	}
+
+	tm = copy;
+	k = strptime(t, "%H:%M:%S", &tm);
+	if (k && *k == 0)
+		goto finish;
+	else if (k && parse_subseconds(k, &ret) == 0)
+		goto finish;
+
+	tm = copy;
+	k = strptime(t, "%H:%M", &tm);
+	if (k && *k == 0) {
+		tm.tm_sec = 0;
+		goto finish;
+	}
+
+	tm = copy;
+	k = strptime(t, "%Y%m%d%H%M%S", &tm);
+	if (k && *k == 0)
+		goto finish;
+	else if (k && parse_subseconds(k, &ret) == 0)
+		goto finish;
+
+	return -EINVAL;
+
+ finish:
+	x = mktime(&tm);
+	if (x == (time_t)-1)
+		return -EINVAL;
+
+	if (weekday >= 0 && tm.tm_wday != weekday)
+		return -EINVAL;
+
+	ret += (usec_t) x * USEC_PER_SEC;
+
+	ret += plus;
+	if (ret > minus)
+		ret -= minus;
+	else
+		ret = 0;
+
+	*usec = ret;
+
+	return 0;
+}
+
+int parse_timestamp(const char *t, usec_t *usec)
+{
+	return parse_timestamp_reference(time(NULL), t, usec);
+}
+
+/* Returns the difference in seconds between its argument and GMT. If if TP is
+ * invalid or no DST information is available default to UTC, that is, zero.
+ * tzset is called so, for example, 'TZ="UTC" hwclock' will work as expected.
+ * Derived from glibc/time/strftime_l.c
+ */
+int get_gmtoff(const struct tm *tp)
+{
+	if (tp->tm_isdst < 0)
+		return 0;
+
+#if HAVE_TM_GMTOFF
+	return tp->tm_gmtoff;
+#else
+	struct tm tm;
+	struct tm gtm;
+	struct tm ltm = *tp;
+	time_t lt;
+
+	tzset();
+	lt = mktime(&ltm);
+	/* Check if mktime returning -1 is an error or a valid time_t */
+	if (lt == (time_t) -1) {
+		if (! localtime_r(&lt, &tm)
+			|| ((ltm.tm_sec ^ tm.tm_sec)
+			    | (ltm.tm_min ^ tm.tm_min)
+			    | (ltm.tm_hour ^ tm.tm_hour)
+			    | (ltm.tm_mday ^ tm.tm_mday)
+			    | (ltm.tm_mon ^ tm.tm_mon)
+			    | (ltm.tm_year ^ tm.tm_year)))
+			return 0;
+	}
+
+	if (! gmtime_r(&lt, &gtm))
+		return 0;
+
+	/* Calculate the GMT offset, that is, the difference between the
+	 * TP argument (ltm) and GMT (gtm).
+	 *
+	 * Compute intervening leap days correctly even if year is negative.
+	 * Take care to avoid int overflow in leap day calculations, but it's OK
+	 * to assume that A and B are close to each other.
+	 */
+	int a4 = (ltm.tm_year >> 2) + (1900 >> 2) - ! (ltm.tm_year & 3);
+	int b4 = (gtm.tm_year >> 2) + (1900 >> 2) - ! (gtm.tm_year & 3);
+	int a100 = a4 / 25 - (a4 % 25 < 0);
+	int b100 = b4 / 25 - (b4 % 25 < 0);
+	int a400 = a100 >> 2;
+	int b400 = b100 >> 2;
+	int intervening_leap_days = (a4 - b4) - (a100 - b100) + (a400 - b400);
+
+	int years = ltm.tm_year - gtm.tm_year;
+	int days = (365 * years + intervening_leap_days
+		    + (ltm.tm_yday - gtm.tm_yday));
+
+	return (60 * (60 * (24 * days + (ltm.tm_hour - gtm.tm_hour))
+		+ (ltm.tm_min - gtm.tm_min)) + (ltm.tm_sec - gtm.tm_sec));
+#endif
+}
+
+static int format_iso_time(struct tm *tm, suseconds_t usec, int flags, char *buf, size_t bufsz)
+{
+	char *p = buf;
+	int len;
+
+	if (flags & ISO_DATE) {
+		len = snprintf(p, bufsz, "%4ld-%.2d-%.2d",
+			       tm->tm_year + (long) 1900,
+			       tm->tm_mon + 1, tm->tm_mday);
+		if (len < 0 || (size_t) len > bufsz)
+			goto err;
+		bufsz -= len;
+		p += len;
+	}
+
+	if ((flags & ISO_DATE) && (flags & ISO_TIME)) {
+		if (bufsz < 1)
+			goto err;
+		*p++ = (flags & ISO_T) ? 'T' : ' ';
+		bufsz--;
+	}
+
+	if (flags & ISO_TIME) {
+		len = snprintf(p, bufsz, "%02d:%02d:%02d", tm->tm_hour,
+			       tm->tm_min, tm->tm_sec);
+		if (len < 0 || (size_t) len > bufsz)
+			goto err;
+		bufsz -= len;
+		p += len;
+	}
+
+	if (flags & ISO_DOTUSEC) {
+		len = snprintf(p, bufsz, ".%06"PRId64, (int64_t) usec);
+		if (len < 0 || (size_t) len > bufsz)
+			goto err;
+		bufsz -= len;
+		p += len;
+
+	} else if (flags & ISO_COMMAUSEC) {
+		len = snprintf(p, bufsz, ",%06"PRId64, (int64_t) usec);
+		if (len < 0 || (size_t) len > bufsz)
+			goto err;
+		bufsz -= len;
+		p += len;
+	}
+
+	if (flags & ISO_TIMEZONE) {
+		int tmin  = get_gmtoff(tm) / 60;
+		int zhour = tmin / 60;
+		int zmin  = abs(tmin % 60);
+		len = snprintf(p, bufsz, "%+03d:%02d", zhour,zmin);
+		if (len < 0 || (size_t) len > bufsz)
+			goto err;
+	}
+	return 0;
+ err:
+	warnx(_("format_iso_time: buffer overflow."));
+	return -1;
+}
+
+/* timeval to ISO 8601 */
+int strtimeval_iso(struct timeval *tv, int flags, char *buf, size_t bufsz)
+{
+	struct tm tm;
+	struct tm *rc;
+
+	if (flags & ISO_GMTIME)
+		rc = gmtime_r(&tv->tv_sec, &tm);
+	else
+		rc = localtime_r(&tv->tv_sec, &tm);
+
+	if (rc)
+		return format_iso_time(&tm, tv->tv_usec, flags, buf, bufsz);
+
+	warnx(_("time %"PRId64" is out of range."), (int64_t)(tv->tv_sec));
+	return -1;
+}
+
+/* struct tm to ISO 8601 */
+int strtm_iso(struct tm *tm, int flags, char *buf, size_t bufsz)
+{
+	return format_iso_time(tm, 0, flags, buf, bufsz);
+}
+
+/* time_t to ISO 8601 */
+int strtime_iso(const time_t *t, int flags, char *buf, size_t bufsz)
+{
+	struct tm tm;
+	struct tm *rc;
+
+	if (flags & ISO_GMTIME)
+		rc = gmtime_r(t, &tm);
+	else
+		rc = localtime_r(t, &tm);
+
+	if (rc)
+		return format_iso_time(&tm, 0, flags, buf, bufsz);
+
+	warnx(_("time %"PRId64" is out of range."), (int64_t)*t);
+	return -1;
+}
+
+/* relative time functions */
+static inline int time_is_thisyear(struct tm const *const tm,
+				   struct tm const *const tmnow)
+{
+	return tm->tm_year == tmnow->tm_year;
+}
+
+static inline int time_is_today(struct tm const *const tm,
+				struct tm const *const tmnow)
+{
+	return (tm->tm_yday == tmnow->tm_yday &&
+		time_is_thisyear(tm, tmnow));
+}
+
+int strtime_short(const time_t *t, struct timeval *now, int flags, char *buf, size_t bufsz)
+{
+	struct tm tm, tmnow;
+	int rc = 0;
+
+	if (now->tv_sec == 0)
+		gettimeofday(now, NULL);
+
+	localtime_r(t, &tm);
+	localtime_r(&now->tv_sec, &tmnow);
+
+	if (time_is_today(&tm, &tmnow)) {
+		rc = snprintf(buf, bufsz, "%02d:%02d", tm.tm_hour, tm.tm_min);
+		if (rc < 0 || (size_t) rc > bufsz)
+			return -1;
+		rc = 1;
+
+	} else if (time_is_thisyear(&tm, &tmnow)) {
+		if (flags & UL_SHORTTIME_THISYEAR_HHMM)
+			rc = strftime(buf, bufsz, "%b%d/%H:%M", &tm);
+		else
+			rc = strftime(buf, bufsz, "%b%d", &tm);
+	} else
+		rc = strftime(buf, bufsz, "%Y-%b%d", &tm);
+
+	return rc <= 0 ? -1 : 0;
+}
+
+#ifndef HAVE_TIMEGM
+time_t timegm(struct tm *tm)
+{
+	const char *zone = getenv("TZ");
+	time_t ret;
+
+	setenv("TZ", "", 1);
+	tzset();
+	ret = mktime(tm);
+	if (zone)
+		setenv("TZ", zone, 1);
+	else
+		unsetenv("TZ");
+	tzset();
+	return ret;
+}
+#endif /* HAVE_TIMEGM */
+
+#ifdef TEST_PROGRAM_TIMEUTILS
+
+static int run_unittest_timestamp(void)
+{
+	int rc = EXIT_SUCCESS;
+	time_t reference = 1674180427;
+	static const struct testcase {
+		const char * const input;
+		usec_t expected;
+	} testcases[] = {
+		{ "2012-09-22 16:34:22"    , 1348331662000000 },
+		{ "2012-09-22 16:34:22,012", 1348331662012000 },
+		{ "2012-09-22 16:34:22.012", 1348331662012000 },
+		{ "@1348331662"            , 1348331662000000 },
+		{ "@1348331662.234567"     , 1348331662234567 },
+		{ "2012-09-22 16:34"       , 1348331640000000 },
+		{ "2012-09-22"             , 1348272000000000 },
+		{ "16:34:22"               , 1674232462000000 },
+		{ "16:34:22,123456"        , 1674232462123456 },
+		{ "16:34:22.123456"        , 1674232462123456 },
+		{ "16:34"                  , 1674232440000000 },
+		{ "now"                    , 1674180427000000 },
+		{ "yesterday"              , 1674086400000000 },
+		{ "today"                  , 1674172800000000 },
+		{ "tomorrow"               , 1674259200000000 },
+		{ "+5min"                  , 1674180727000000 },
+		{ "-5days"                 , 1673748427000000 },
+		{ "20120922163422"         , 1348331662000000 },
+	};
+
+	setenv("TZ", "GMT", 1);
+	tzset();
+
+	for (size_t i = 0; i < ARRAY_SIZE(testcases); i++) {
+		struct testcase t = testcases[i];
+		usec_t result;
+		int r = parse_timestamp_reference(reference, t.input, &result);
+		if (r) {
+			fprintf(stderr, "Could not parse '%s'\n", t.input);
+			rc = EXIT_FAILURE;
+		}
+
+		if (result != t.expected) {
+			fprintf(stderr, "#%02zu %-25s: %"PRId64" != %"PRId64"\n",
+				i, t.input, result, t.expected);
+			rc = EXIT_FAILURE;
+		}
+	}
+
+	return rc;
+}
+
+int main(int argc, char *argv[])
+{
+	struct timeval tv = { 0 };
+	char buf[ISO_BUFSIZ];
+
+	if (argc < 2) {
+		fprintf(stderr, "usage: %s [<time> [<usec>]] | [--timestamp <str>] | [--unittest-timestamp]\n", argv[0]);
+		exit(EXIT_FAILURE);
+	}
+
+	if (strcmp(argv[1], "--unittest-timestamp") == 0) {
+		return run_unittest_timestamp();
+	}
+
+	if (strcmp(argv[1], "--timestamp") == 0) {
+		usec_t usec = 0;
+
+		parse_timestamp(argv[2], &usec);
+		tv.tv_sec = (time_t) (usec / 1000000);
+		tv.tv_usec = usec % 1000000;
+	} else {
+		tv.tv_sec = strtos64_or_err(argv[1], "failed to parse <time>");
+		if (argc == 3)
+			tv.tv_usec = strtos64_or_err(argv[2], "failed to parse <usec>");
+	}
+
+	strtimeval_iso(&tv, ISO_DATE, buf, sizeof(buf));
+	printf("Date: '%s'\n", buf);
+
+	strtimeval_iso(&tv, ISO_TIME, buf, sizeof(buf));
+	printf("Time: '%s'\n", buf);
+
+	strtimeval_iso(&tv, ISO_DATE | ISO_TIME | ISO_COMMAUSEC | ISO_T,
+		       buf, sizeof(buf));
+	printf("Full: '%s'\n", buf);
+
+	strtimeval_iso(&tv, ISO_TIMESTAMP_DOT, buf, sizeof(buf));
+	printf("Zone: '%s'\n", buf);
+
+	return EXIT_SUCCESS;
+}
+
+#endif /* TEST_PROGRAM_TIMEUTILS */
diff --git a/lib/ttyutils.c b/lib/ttyutils.c
new file mode 100644
index 0000000..7064565
--- /dev/null
+++ b/lib/ttyutils.c
@@ -0,0 +1,152 @@
+/*
+ * No copyright is claimed.  This code is in the public domain; do with
+ * it what you wish.
+ *
+ * Written by Karel Zak <kzak@redhat.com>
+ */
+#include <ctype.h>
+#include <unistd.h>
+
+#include "c.h"
+#include "ttyutils.h"
+
+
+static int get_env_int(const char *name)
+{
+	const char *cp = getenv(name);
+
+	if (cp) {
+		char *end = NULL;
+		long x;
+
+		errno = 0;
+		x = strtol(cp, &end, 10);
+
+		if (errno == 0 && end && *end == '\0' && end > cp &&
+		    x > 0 && x <= INT_MAX)
+			return x;
+	}
+
+	return -1;
+}
+
+int get_terminal_dimension(int *cols, int *lines)
+{
+	int c = 0, l = 0;
+
+#if defined(TIOCGWINSZ)
+	struct winsize	w_win;
+	if (ioctl (STDOUT_FILENO, TIOCGWINSZ, &w_win) == 0) {
+		c = w_win.ws_col;
+		l = w_win.ws_row;
+	}
+#elif defined(TIOCGSIZE)
+	struct ttysize	t_win;
+	if (ioctl (STDOUT_FILENO, TIOCGSIZE, &t_win) == 0) {
+		c = t_win.ts_cols;
+		l = t_win.ts_lines;
+	}
+#endif
+	if (cols) {
+		if (c <= 0)
+			c = get_env_int("COLUMNS");
+		*cols = c;
+	}
+	if (lines) {
+		if (l <= 0)
+			l = get_env_int("LINES");
+		*lines = l;
+	}
+	return 0;
+}
+
+int get_terminal_width(int default_width)
+{
+	int width = 0;
+
+	get_terminal_dimension(&width, NULL);
+
+	return width > 0 ? width : default_width;
+}
+
+int get_terminal_stdfd(void)
+{
+	if (isatty(STDIN_FILENO))
+		return STDIN_FILENO;
+	if (isatty(STDOUT_FILENO))
+		return STDOUT_FILENO;
+	if (isatty(STDERR_FILENO))
+		return STDERR_FILENO;
+
+	return -EINVAL;
+}
+
+int get_terminal_name(const char **path,
+		      const char **name,
+		      const char **number)
+{
+	const char *tty;
+	const char *p;
+	int fd;
+
+
+	if (name)
+		*name = NULL;
+	if (path)
+		*path = NULL;
+	if (number)
+		*number = NULL;
+
+	fd = get_terminal_stdfd();
+	if (fd < 0)
+		return fd;	/* error */
+
+	tty = ttyname(fd);
+	if (!tty)
+		return -1;
+
+	if (path)
+		*path = tty;
+	if (name || number)
+		tty = strncmp(tty, "/dev/", 5) == 0 ? tty + 5 : tty;
+	if (name)
+		*name = tty;
+	if (number) {
+		for (p = tty; p && *p; p++) {
+			if (isdigit(*p)) {
+				*number = p;
+				break;
+			}
+		}
+	}
+	return 0;
+}
+
+int get_terminal_type(const char **type)
+{
+	*type = getenv("TERM");
+	if (*type)
+		return -EINVAL;
+	return 0;
+}
+
+#ifdef TEST_PROGRAM_TTYUTILS
+# include <stdlib.h>
+int main(void)
+{
+	const char *path, *name, *num;
+	int c, l;
+
+	if (get_terminal_name(&path, &name, &num) == 0) {
+		fprintf(stderr, "tty path:   %s\n", path);
+		fprintf(stderr, "tty name:   %s\n", name);
+		fprintf(stderr, "tty number: %s\n", num);
+	}
+	get_terminal_dimension(&c, &l);
+	fprintf(stderr,         "tty cols:   %d\n", c);
+	fprintf(stderr,         "tty lines:  %d\n", l);
+
+
+	return EXIT_SUCCESS;
+}
+#endif /* TEST_PROGRAM_TTYUTILS */
diff --git a/lib/xxhash.c b/lib/xxhash.c
new file mode 100644
index 0000000..691ef1a
--- /dev/null
+++ b/lib/xxhash.c
@@ -0,0 +1,45 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * xxHash - Extremely Fast Hash algorithm
+ * Copyright (C) 2012-2020 Yann Collet
+ *
+ * BSD 2-Clause License (https://www.opensource.org/licenses/bsd-license.php)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *    * Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *    * Redistributions in binary form must reproduce the above
+ *      copyright notice, this list of conditions and the following disclaimer
+ *      in the documentation and/or other materials provided with the
+ *      distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * You can contact the author at:
+ *   - xxHash homepage: https://www.xxhash.com
+ *   - xxHash source repository: https://github.com/Cyan4973/xxHash
+ */
+
+
+/*
+ * xxhash.c instantiates functions defined in xxhash.h
+ */
+
+#define XXH_STATIC_LINKING_ONLY   /* access advanced declarations */
+#define XXH_IMPLEMENTATION   /* access definitions */
+
+#include "xxhash.h"