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+++ b/src/system.h
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+/* system-dependent definitions for coreutils
+ Copyright (C) 1989-2023 Free Software Foundation, Inc.
+
+ 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 3 of the License, 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, see <https://www.gnu.org/licenses/>. */
+
+/* Include this file _after_ system headers if possible. */
+
+#include <attribute.h>
+
+#include <alloca.h>
+
+#include <sys/stat.h>
+
+/* Commonly used file permission combination. */
+#define MODE_RW_UGO (S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)
+
+#if HAVE_SYS_PARAM_H
+# include <sys/param.h>
+#endif
+
+#include <unistd.h>
+
+#include <limits.h>
+
+#include "pathmax.h"
+#ifndef PATH_MAX
+# define PATH_MAX 8192
+#endif
+
+#include "configmake.h"
+
+#include <sys/time.h>
+#include <time.h>
+
+/* Since major is a function on SVR4, we can't use 'ifndef major'. */
+#if MAJOR_IN_MKDEV
+# include <sys/mkdev.h>
+# define HAVE_MAJOR
+#endif
+#if MAJOR_IN_SYSMACROS
+# include <sys/sysmacros.h>
+# define HAVE_MAJOR
+#endif
+#ifdef major /* Might be defined in sys/types.h. */
+# define HAVE_MAJOR
+#endif
+
+#ifndef HAVE_MAJOR
+# define major(dev) (((dev) >> 8) & 0xff)
+# define minor(dev) ((dev) & 0xff)
+# define makedev(maj, min) (((maj) << 8) | (min))
+#endif
+#undef HAVE_MAJOR
+
+#if ! defined makedev && defined mkdev
+# define makedev(maj, min) mkdev (maj, min)
+#endif
+
+#include <stddef.h>
+#include <string.h>
+#include <errno.h>
+
+/* Some systems don't define this; POSIX mentions it but says it is
+ obsolete. gnulib defines it, but only on native Windows systems,
+ and there only because MSVC 10 does. */
+#ifndef ENODATA
+# define ENODATA (-1)
+#endif
+
+#include <stdlib.h>
+#include "version.h"
+
+/* Exit statuses for programs like 'env' that exec other programs. */
+enum
+{
+ EXIT_TIMEDOUT = 124, /* Time expired before child completed. */
+ EXIT_CANCELED = 125, /* Internal error prior to exec attempt. */
+ EXIT_CANNOT_INVOKE = 126, /* Program located, but not usable. */
+ EXIT_ENOENT = 127 /* Could not find program to exec. */
+};
+
+#include "exitfail.h"
+
+/* Set exit_failure to STATUS if that's not the default already. */
+static inline void
+initialize_exit_failure (int status)
+{
+ if (status != EXIT_FAILURE)
+ exit_failure = status;
+}
+
+#include <fcntl.h>
+#ifdef O_PATH
+enum { O_PATHSEARCH = O_PATH };
+#else
+enum { O_PATHSEARCH = O_SEARCH };
+#endif
+
+#include <dirent.h>
+#ifndef _D_EXACT_NAMLEN
+# define _D_EXACT_NAMLEN(dp) strlen ((dp)->d_name)
+#endif
+
+enum
+{
+ NOT_AN_INODE_NUMBER = 0
+};
+
+#ifdef D_INO_IN_DIRENT
+# define D_INO(dp) (dp)->d_ino
+#else
+/* Some systems don't have inodes, so fake them to avoid lots of ifdefs. */
+# define D_INO(dp) NOT_AN_INODE_NUMBER
+#endif
+
+/* include here for SIZE_MAX. */
+#include <inttypes.h>
+
+/* Redirection and wildcarding when done by the utility itself.
+ Generally a noop, but used in particular for OS/2. */
+#ifndef initialize_main
+# ifndef __OS2__
+# define initialize_main(ac, av)
+# else
+# define initialize_main(ac, av) \
+ do { _wildcard (ac, av); _response (ac, av); } while (0)
+# endif
+#endif
+
+#include "stat-macros.h"
+
+#include "timespec.h"
+
+#include <ctype.h>
+
+/* ISDIGIT differs from isdigit, as follows:
+ - Its arg may be any int or unsigned int; it need not be an unsigned char
+ or EOF.
+ - It's typically faster.
+ POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to
+ isdigit unless it's important to use the locale's definition
+ of 'digit' even when the host does not conform to POSIX. */
+#define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
+
+/* Convert a possibly-signed character to an unsigned character. This is
+ a bit safer than casting to unsigned char, since it catches some type
+ errors that the cast doesn't. */
+static inline unsigned char to_uchar (char ch) { return ch; }
+
+/* '\n' is considered a field separator with --zero-terminated. */
+static inline bool
+field_sep (unsigned char ch)
+{
+ return isblank (ch) || ch == '\n';
+}
+
+#include <locale.h>
+
+/* Take care of NLS matters. */
+
+#include "gettext.h"
+#if ! ENABLE_NLS
+# undef textdomain
+# define textdomain(Domainname) /* empty */
+# undef bindtextdomain
+# define bindtextdomain(Domainname, Dirname) /* empty */
+#endif
+
+#define _(msgid) gettext (msgid)
+#define N_(msgid) msgid
+
+/* Return a value that pluralizes the same way that N does, in all
+ languages we know of. */
+static inline unsigned long int
+select_plural (uintmax_t n)
+{
+ /* Reduce by a power of ten, but keep it away from zero. The
+ gettext manual says 1000000 should be safe. */
+ enum { PLURAL_REDUCER = 1000000 };
+ return (n <= ULONG_MAX ? n : n % PLURAL_REDUCER + PLURAL_REDUCER);
+}
+
+#define STREQ(a, b) (strcmp (a, b) == 0)
+#define STREQ_LEN(a, b, n) (strncmp (a, b, n) == 0) /* n==-1 means unbounded */
+#define STRPREFIX(a, b) (strncmp (a, b, strlen (b)) == 0)
+
+/* Just like strncmp, but the second argument must be a literal string
+ and you don't specify the length; that comes from the literal. */
+#define STRNCMP_LIT(s, lit) strncmp (s, "" lit "", sizeof (lit) - 1)
+
+#if !HAVE_DECL_GETLOGIN
+char *getlogin (void);
+#endif
+
+#if !HAVE_DECL_TTYNAME
+char *ttyname (int);
+#endif
+
+#if !HAVE_DECL_GETEUID
+uid_t geteuid (void);
+#endif
+
+#if !HAVE_DECL_GETPWUID
+struct passwd *getpwuid (uid_t);
+#endif
+
+#if !HAVE_DECL_GETGRGID
+struct group *getgrgid (gid_t);
+#endif
+
+/* Interix has replacements for getgr{gid,nam,ent}, that don't
+ query the domain controller for group members when not required.
+ This speeds up the calls tremendously (<1 ms vs. >3 s). */
+/* To protect any system that could provide _nomembers functions
+ other than interix, check for HAVE_SETGROUPS, as interix is
+ one of the very few (the only?) platform that lacks it */
+#if ! HAVE_SETGROUPS
+# if HAVE_GETGRGID_NOMEMBERS
+# define getgrgid(gid) getgrgid_nomembers(gid)
+# endif
+# if HAVE_GETGRNAM_NOMEMBERS
+# define getgrnam(nam) getgrnam_nomembers(nam)
+# endif
+# if HAVE_GETGRENT_NOMEMBERS
+# define getgrent() getgrent_nomembers()
+# endif
+#endif
+
+#if !HAVE_DECL_GETUID
+uid_t getuid (void);
+#endif
+
+#include "idx.h"
+#include "xalloc.h"
+#include "verify.h"
+
+/* This is simply a shorthand for the common case in which
+ the third argument to x2nrealloc would be 'sizeof *(P)'.
+ Ensure that sizeof *(P) is *not* 1. In that case, it'd be
+ better to use X2REALLOC, although not strictly necessary. */
+#define X2NREALLOC(P, PN) verify_expr (sizeof *(P) != 1, \
+ x2nrealloc (P, PN, sizeof *(P)))
+
+/* Using x2realloc (when appropriate) usually makes your code more
+ readable than using x2nrealloc, but it also makes it so your
+ code will malfunction if sizeof *(P) ever becomes 2 or greater.
+ So use this macro instead of using x2realloc directly. */
+#define X2REALLOC(P, PN) verify_expr (sizeof *(P) == 1, \
+ x2realloc (P, PN))
+
+#include "unlocked-io.h"
+#include "same-inode.h"
+
+#include "dirname.h"
+#include "openat.h"
+
+static inline bool
+dot_or_dotdot (char const *file_name)
+{
+ if (file_name[0] == '.')
+ {
+ char sep = file_name[(file_name[1] == '.') + 1];
+ return (! sep || ISSLASH (sep));
+ }
+ else
+ return false;
+}
+
+/* A wrapper for readdir so that callers don't see entries for '.' or '..'. */
+static inline struct dirent const *
+readdir_ignoring_dot_and_dotdot (DIR *dirp)
+{
+ while (true)
+ {
+ struct dirent const *dp = readdir (dirp);
+ if (dp == nullptr || ! dot_or_dotdot (dp->d_name))
+ return dp;
+ }
+}
+
+/* Return -1 if DIR is an empty directory,
+ 0 if DIR is a nonempty directory,
+ and a positive error number if there was trouble determining
+ whether DIR is an empty or nonempty directory. */
+enum {
+ DS_UNKNOWN = -2,
+ DS_EMPTY = -1,
+ DS_NONEMPTY = 0,
+};
+static inline int
+directory_status (int fd_cwd, char const *dir)
+{
+ DIR *dirp;
+ bool no_direntries;
+ int saved_errno;
+ int fd = openat (fd_cwd, dir,
+ (O_RDONLY | O_DIRECTORY
+ | O_NOCTTY | O_NOFOLLOW | O_NONBLOCK));
+
+ if (fd < 0)
+ return errno;
+
+ dirp = fdopendir (fd);
+ if (dirp == nullptr)
+ {
+ saved_errno = errno;
+ close (fd);
+ return saved_errno;
+ }
+
+ errno = 0;
+ no_direntries = !readdir_ignoring_dot_and_dotdot (dirp);
+ saved_errno = errno;
+ closedir (dirp);
+ return no_direntries && saved_errno == 0 ? DS_EMPTY : saved_errno;
+}
+
+/* Factor out some of the common --help and --version processing code. */
+
+/* These enum values cannot possibly conflict with the option values
+ ordinarily used by commands, including CHAR_MAX + 1, etc. Avoid
+ CHAR_MIN - 1, as it may equal -1, the getopt end-of-options value. */
+enum
+{
+ GETOPT_HELP_CHAR = (CHAR_MIN - 2),
+ GETOPT_VERSION_CHAR = (CHAR_MIN - 3)
+};
+
+#define GETOPT_HELP_OPTION_DECL \
+ "help", no_argument, nullptr, GETOPT_HELP_CHAR
+#define GETOPT_VERSION_OPTION_DECL \
+ "version", no_argument, nullptr, GETOPT_VERSION_CHAR
+#define GETOPT_SELINUX_CONTEXT_OPTION_DECL \
+ "context", optional_argument, nullptr, 'Z'
+
+#define case_GETOPT_HELP_CHAR \
+ case GETOPT_HELP_CHAR: \
+ usage (EXIT_SUCCESS); \
+ break;
+
+/* Program_name must be a literal string.
+ Usually it is just PROGRAM_NAME. */
+#define USAGE_BUILTIN_WARNING \
+ _("\n" \
+"NOTE: your shell may have its own version of %s, which usually supersedes\n" \
+"the version described here. Please refer to your shell's documentation\n" \
+"for details about the options it supports.\n")
+
+#define HELP_OPTION_DESCRIPTION \
+ _(" --help display this help and exit\n")
+#define VERSION_OPTION_DESCRIPTION \
+ _(" --version output version information and exit\n")
+
+#include "closein.h"
+#include "closeout.h"
+
+#define emit_bug_reporting_address unused__emit_bug_reporting_address
+#include "version-etc.h"
+#undef emit_bug_reporting_address
+
+#include "propername.h"
+/* Define away proper_name, since it's not worth the cost of adding ~17KB to
+ the x86_64 text size of every single program. This avoids a 40%
+ (almost ~2MB) increase in the file system space utilization for the set
+ of the 100 binaries. */
+#define proper_name(x) proper_name_lite (x, x)
+
+#include "progname.h"
+
+#define case_GETOPT_VERSION_CHAR(Program_name, Authors) \
+ case GETOPT_VERSION_CHAR: \
+ version_etc (stdout, Program_name, PACKAGE_NAME, Version, Authors, \
+ (char *) nullptr); \
+ exit (EXIT_SUCCESS); \
+ break;
+
+#include "minmax.h"
+#include "intprops.h"
+
+#ifndef SSIZE_MAX
+# define SSIZE_MAX TYPE_MAXIMUM (ssize_t)
+#endif
+
+#ifndef OFF_T_MIN
+# define OFF_T_MIN TYPE_MINIMUM (off_t)
+#endif
+
+#ifndef OFF_T_MAX
+# define OFF_T_MAX TYPE_MAXIMUM (off_t)
+#endif
+
+#ifndef UID_T_MAX
+# define UID_T_MAX TYPE_MAXIMUM (uid_t)
+#endif
+
+#ifndef GID_T_MAX
+# define GID_T_MAX TYPE_MAXIMUM (gid_t)
+#endif
+
+#ifndef PID_T_MAX
+# define PID_T_MAX TYPE_MAXIMUM (pid_t)
+#endif
+
+/* Use this to suppress gcc warnings. */
+#ifdef lint
+# define IF_LINT(Code) Code
+#else
+# define IF_LINT(Code) /* empty */
+#endif
+
+/* main_exit should be called only from the main function. It is
+ equivalent to 'exit'. When checking for lint it calls 'exit', to
+ pacify gcc -fsanitize=lint which would otherwise have false alarms
+ for pointers in the main function's activation record. Otherwise
+ it simply returns from 'main'; this used to be what gcc's static
+ checking preferred and may yet be again. */
+#ifdef lint
+# define main_exit(status) exit (status)
+#else
+# define main_exit(status) return status
+#endif
+
+#ifdef __GNUC__
+# define LIKELY(cond) __builtin_expect ((cond), 1)
+# define UNLIKELY(cond) __builtin_expect ((cond), 0)
+#else
+# define LIKELY(cond) (cond)
+# define UNLIKELY(cond) (cond)
+#endif
+
+
+#if defined strdupa
+# define ASSIGN_STRDUPA(DEST, S) \
+ do { DEST = strdupa (S); } while (0)
+#else
+# define ASSIGN_STRDUPA(DEST, S) \
+ do \
+ { \
+ char const *s_ = (S); \
+ size_t len_ = strlen (s_) + 1; \
+ char *tmp_dest_ = alloca (len_); \
+ DEST = memcpy (tmp_dest_, s_, len_); \
+ } \
+ while (0)
+#endif
+
+#if ! HAVE_SYNC
+# define sync() /* empty */
+#endif
+
+/* Compute the greatest common divisor of U and V using Euclid's
+ algorithm. U and V must be nonzero. */
+
+ATTRIBUTE_CONST
+static inline size_t
+gcd (size_t u, size_t v)
+{
+ do
+ {
+ size_t t = u % v;
+ u = v;
+ v = t;
+ }
+ while (v);
+
+ return u;
+}
+
+/* Compute the least common multiple of U and V. U and V must be
+ nonzero. There is no overflow checking, so callers should not
+ specify outlandish sizes. */
+
+ATTRIBUTE_CONST
+static inline size_t
+lcm (size_t u, size_t v)
+{
+ return u * (v / gcd (u, v));
+}
+
+/* Return PTR, aligned upward to the next multiple of ALIGNMENT.
+ ALIGNMENT must be nonzero. The caller must arrange for ((char *)
+ PTR) through ((char *) PTR + ALIGNMENT - 1) to be addressable
+ locations. */
+
+static inline void *
+ptr_align (void const *ptr, size_t alignment)
+{
+ char const *p0 = ptr;
+ char const *p1 = p0 + alignment - 1;
+ return (void *) (p1 - (size_t) p1 % alignment);
+}
+
+/* Return whether the buffer consists entirely of NULs.
+ Based on memeqzero in CCAN by Rusty Russell under CC0 (Public domain). */
+
+ATTRIBUTE_PURE
+static inline bool
+is_nul (void const *buf, size_t length)
+{
+ const unsigned char *p = buf;
+/* Using possibly unaligned access for the first 16 bytes
+ saves about 30-40 cycles, though it is strictly undefined behavior
+ and so would need __attribute__ ((__no_sanitize_undefined__))
+ to avoid -fsanitize=undefined warnings.
+ Considering coreutils is mainly concerned with relatively
+ large buffers, we'll just use the defined behavior. */
+#if 0 && (_STRING_ARCH_unaligned || _STRING_INLINE_unaligned)
+ unsigned long word;
+#else
+ unsigned char word;
+#endif
+
+ if (! length)
+ return true;
+
+ /* Check len bytes not aligned on a word. */
+ while (UNLIKELY (length & (sizeof word - 1)))
+ {
+ if (*p)
+ return false;
+ p++;
+ length--;
+ if (! length)
+ return true;
+ }
+
+ /* Check up to 16 bytes a word at a time. */
+ for (;;)
+ {
+ memcpy (&word, p, sizeof word);
+ if (word)
+ return false;
+ p += sizeof word;
+ length -= sizeof word;
+ if (! length)
+ return true;
+ if (UNLIKELY (length & 15) == 0)
+ break;
+ }
+
+ /* Now we know first 16 bytes are NUL, memcmp with self. */
+ return memcmp (buf, p, length) == 0;
+}
+
+/* If 10*Accum + Digit_val is larger than the maximum value for Type,
+ then don't update Accum and return false to indicate it would
+ overflow. Otherwise, set Accum to that new value and return true.
+ Verify at compile-time that Type is Accum's type, and that Type is
+ unsigned. Accum must be an object, so that we can take its
+ address. Accum and Digit_val may be evaluated multiple times.
+
+ The "Added check" below is not strictly required, but it causes GCC
+ to return a nonzero exit status instead of merely a warning
+ diagnostic, and that is more useful. */
+
+#define DECIMAL_DIGIT_ACCUMULATE(Accum, Digit_val, Type) \
+ ( \
+ (void) (&(Accum) == (Type *) nullptr), /* The type matches. */ \
+ verify_expr (! TYPE_SIGNED (Type), /* The type is unsigned. */ \
+ (((Type) -1 / 10 < (Accum) \
+ || (Type) ((Accum) * 10 + (Digit_val)) < (Accum)) \
+ ? false \
+ : (((Accum) = (Accum) * 10 + (Digit_val)), true))) \
+ )
+
+static inline void
+emit_stdin_note (void)
+{
+ fputs (_("\n\
+With no FILE, or when FILE is -, read standard input.\n\
+"), stdout);
+}
+static inline void
+emit_mandatory_arg_note (void)
+{
+ fputs (_("\n\
+Mandatory arguments to long options are mandatory for short options too.\n\
+"), stdout);
+}
+
+static inline void
+emit_size_note (void)
+{
+ fputs (_("\n\
+The SIZE argument is an integer and optional unit (example: 10K is 10*1024).\n\
+Units are K,M,G,T,P,E,Z,Y,R,Q (powers of 1024) or KB,MB,... (powers of 1000).\n\
+Binary prefixes can be used, too: KiB=K, MiB=M, and so on.\n\
+"), stdout);
+}
+
+static inline void
+emit_blocksize_note (char const *program)
+{
+ printf (_("\n\
+Display values are in units of the first available SIZE from --block-size,\n\
+and the %s_BLOCK_SIZE, BLOCK_SIZE and BLOCKSIZE environment variables.\n\
+Otherwise, units default to 1024 bytes (or 512 if POSIXLY_CORRECT is set).\n\
+"), program);
+}
+
+static inline void
+emit_update_parameters_note (void)
+{
+ fputs (_("\
+\n\
+UPDATE controls which existing files in the destination are replaced.\n\
+'all' is the default operation when an --update option is not specified,\n\
+and results in all existing files in the destination being replaced.\n\
+'none' is similar to the --no-clobber option, in that no files in the\n\
+destination are replaced, but also skipped files do not induce a failure.\n\
+'older' is the default operation when --update is specified, and results\n\
+in files being replaced if they're older than the corresponding source file.\n\
+"), stdout);
+}
+
+static inline void
+emit_backup_suffix_note (void)
+{
+ fputs (_("\
+\n\
+The backup suffix is '~', unless set with --suffix or SIMPLE_BACKUP_SUFFIX.\n\
+The version control method may be selected via the --backup option or through\n\
+the VERSION_CONTROL environment variable. Here are the values:\n\
+\n\
+"), stdout);
+ fputs (_("\
+ none, off never make backups (even if --backup is given)\n\
+ numbered, t make numbered backups\n\
+ existing, nil numbered if numbered backups exist, simple otherwise\n\
+ simple, never always make simple backups\n\
+"), stdout);
+}
+
+static inline void
+emit_exec_status (char const *program)
+{
+ printf (_("\n\
+Exit status:\n\
+ 125 if the %s command itself fails\n\
+ 126 if COMMAND is found but cannot be invoked\n\
+ 127 if COMMAND cannot be found\n\
+ - the exit status of COMMAND otherwise\n\
+"), program);
+}
+
+static inline void
+emit_ancillary_info (char const *program)
+{
+ struct infomap { char const *program; char const *node; } const infomap[] = {
+ { "[", "test invocation" },
+ { "coreutils", "Multi-call invocation" },
+ { "sha224sum", "sha2 utilities" },
+ { "sha256sum", "sha2 utilities" },
+ { "sha384sum", "sha2 utilities" },
+ { "sha512sum", "sha2 utilities" },
+ { nullptr, nullptr }
+ };
+
+ char const *node = program;
+ struct infomap const *map_prog = infomap;
+
+ while (map_prog->program && ! STREQ (program, map_prog->program))
+ map_prog++;
+
+ if (map_prog->node)
+ node = map_prog->node;
+
+ printf (_("\n%s online help: <%s>\n"), PACKAGE_NAME, PACKAGE_URL);
+
+ /* Don't output this redundant message for English locales.
+ Note we still output for 'C' so that it gets included in the man page. */
+ char const *lc_messages = setlocale (LC_MESSAGES, nullptr);
+ if (lc_messages && STRNCMP_LIT (lc_messages, "en_"))
+ {
+ /* TRANSLATORS: Replace LANG_CODE in this URL with your language code
+ <https://translationproject.org/team/LANG_CODE.html> to form one of
+ the URLs at https://translationproject.org/team/. Otherwise, replace
+ the entire URL with your translation team's email address. */
+ fputs (_("Report any translation bugs to "
+ "<https://translationproject.org/team/>\n"), stdout);
+ }
+ /* .htaccess on the coreutils web site maps programs to the appropriate page,
+ however we explicitly handle "[" -> "test" here as the "[" is not
+ recognized as part of a URL by default in terminals. */
+ char const *url_program = STREQ (program, "[") ? "test" : program;
+ printf (_("Full documentation <%s%s>\n"),
+ PACKAGE_URL, url_program);
+ printf (_("or available locally via: info '(coreutils) %s%s'\n"),
+ node, node == program ? " invocation" : "");
+}
+
+/* Use a macro rather than an inline function, as this references
+ the global program_name, which causes dynamic linking issues
+ in libstdbuf.so on some systems where unused functions
+ are not removed by the linker. */
+#define emit_try_help() \
+ do \
+ { \
+ fprintf (stderr, _("Try '%s --help' for more information.\n"), \
+ program_name); \
+ } \
+ while (0)
+
+#include "inttostr.h"
+
+static inline char *
+timetostr (time_t t, char *buf)
+{
+ return (TYPE_SIGNED (time_t)
+ ? imaxtostr (t, buf)
+ : umaxtostr (t, buf));
+}
+
+static inline char *
+bad_cast (char const *s)
+{
+ return (char *) s;
+}
+
+/* Return a boolean indicating whether SB->st_size is defined. */
+static inline bool
+usable_st_size (struct stat const *sb)
+{
+ return (S_ISREG (sb->st_mode) || S_ISLNK (sb->st_mode)
+ || S_TYPEISSHM (sb) || S_TYPEISTMO (sb));
+}
+
+_Noreturn void usage (int status);
+
+#include "error.h"
+
+/* Like error(0, 0, ...), but without an implicit newline.
+ Also a noop unless the global DEV_DEBUG is set. */
+#define devmsg(...) \
+ do \
+ { \
+ if (dev_debug) \
+ fprintf (stderr, __VA_ARGS__); \
+ } \
+ while (0)
+
+#define emit_cycle_warning(file_name) \
+ do \
+ { \
+ error (0, 0, _("\
+WARNING: Circular directory structure.\n\
+This almost certainly means that you have a corrupted file system.\n\
+NOTIFY YOUR SYSTEM MANAGER.\n\
+The following directory is part of the cycle:\n %s\n"), \
+ quotef (file_name)); \
+ } \
+ while (0)
+
+/* exit with a _single_ "write error" diagnostic. */
+
+static inline void
+write_error (void)
+{
+ int saved_errno = errno;
+ fflush (stdout); /* Last attempt to write any buffered data. */
+ fpurge (stdout); /* Ensure nothing buffered that might induce an error. */
+ clearerr (stdout); /* Avoid extraneous diagnostic from close_stdout. */
+ error (EXIT_FAILURE, saved_errno, _("write error"));
+}
+
+/* Like stpncpy, but do ensure that the result is NUL-terminated,
+ and do not NUL-pad out to LEN. I.e., when strnlen (src, len) == len,
+ this function writes a NUL byte into dest[len]. Thus, the length
+ of the destination buffer must be at least LEN + 1.
+ The DEST and SRC buffers must not overlap. */
+static inline char *
+stzncpy (char *restrict dest, char const *restrict src, size_t len)
+{
+ size_t i;
+ for (i = 0; i < len && *src; i++)
+ *dest++ = *src++;
+ *dest = 0;
+ return dest;
+}
+
+#ifndef ARRAY_CARDINALITY
+# define ARRAY_CARDINALITY(Array) (sizeof (Array) / sizeof *(Array))
+#endif
+
+/* Return true if ERR is ENOTSUP or EOPNOTSUPP, otherwise false.
+ This wrapper function avoids the redundant 'or'd comparison on
+ systems like Linux for which they have the same value. It also
+ avoids the gcc warning to that effect. */
+static inline bool
+is_ENOTSUP (int err)
+{
+ return err == EOPNOTSUPP || (ENOTSUP != EOPNOTSUPP && err == ENOTSUP);
+}
+
+
+/* How coreutils quotes filenames, to minimize use of outer quotes,
+ but also provide better support for copy and paste when used. */
+#include "quotearg.h"
+
+/* Use these to shell quote only when necessary,
+ when the quoted item is already delimited with colons. */
+#define quotef(arg) \
+ quotearg_n_style_colon (0, shell_escape_quoting_style, arg)
+#define quotef_n(n, arg) \
+ quotearg_n_style_colon (n, shell_escape_quoting_style, arg)
+
+/* Use these when there are spaces around the file name,
+ in the error message. */
+#define quoteaf(arg) \
+ quotearg_style (shell_escape_always_quoting_style, arg)
+#define quoteaf_n(n, arg) \
+ quotearg_n_style (n, shell_escape_always_quoting_style, arg)