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-rw-r--r--lib/vfs/interface.c875
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diff --git a/lib/vfs/interface.c b/lib/vfs/interface.c
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--- /dev/null
+++ b/lib/vfs/interface.c
@@ -0,0 +1,875 @@
+/*
+ Virtual File System: interface functions
+
+ Copyright (C) 2011-2023
+ Free Software Foundation, Inc.
+
+ Written by:
+ Slava Zanko <slavazanko@gmail.com>, 2011, 2013
+ Andrew Borodin <aborodin@vmail.ru>, 2011-2022
+
+ This file is part of the Midnight Commander.
+
+ The Midnight Commander 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.
+
+ The Midnight Commander 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 <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * \file
+ * \brief Source: Virtual File System: path handlers
+ * \author Slava Zanko
+ * \date 2011
+ */
+
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h> /* For atol() */
+#include <stdarg.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <signal.h>
+#include <ctype.h> /* is_digit() */
+#include <sys/stat.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <pwd.h>
+#include <grp.h>
+
+#include "lib/global.h"
+
+#include "lib/widget.h" /* message() */
+#include "lib/strutil.h" /* str_crt_conv_from() */
+#include "lib/util.h"
+
+#include "vfs.h"
+#include "utilvfs.h"
+#include "path.h"
+#include "gc.h"
+#include "xdirentry.h"
+
+/* TODO: move it to separate private .h */
+extern GString *vfs_str_buffer;
+extern vfs_class *current_vfs;
+extern struct vfs_dirent *mc_readdir_result;
+
+/*** global variables ****************************************************************************/
+
+/*** file scope macro definitions ****************************************************************/
+
+/*** file scope type declarations ****************************************************************/
+
+/*** forward declarations (file scope functions) *************************************************/
+
+/*** file scope variables ************************************************************************/
+
+/* --------------------------------------------------------------------------------------------- */
+/*** file scope functions ************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+static vfs_path_t *
+mc_def_getlocalcopy (const vfs_path_t * filename_vpath)
+{
+ vfs_path_t *tmp_vpath = NULL;
+ int fdin, fdout = -1;
+ ssize_t i;
+ char buffer[BUF_1K * 8];
+ struct stat mystat;
+
+ fdin = mc_open (filename_vpath, O_RDONLY | O_LINEAR);
+ if (fdin == -1)
+ goto fail;
+
+ fdout = vfs_mkstemps (&tmp_vpath, "vfs", vfs_path_get_last_path_str (filename_vpath));
+ if (fdout == -1)
+ goto fail;
+
+ while ((i = mc_read (fdin, buffer, sizeof (buffer))) > 0)
+ {
+ if (write (fdout, buffer, i) != i)
+ goto fail;
+ }
+ if (i == -1)
+ goto fail;
+ i = mc_close (fdin);
+ fdin = -1;
+ if (i == -1)
+ goto fail;
+
+ i = close (fdout);
+ fdout = -1;
+ if (i == -1)
+ goto fail;
+
+ if (mc_stat (filename_vpath, &mystat) != -1)
+ mc_chmod (tmp_vpath, mystat.st_mode);
+
+ return tmp_vpath;
+
+ fail:
+ vfs_path_free (tmp_vpath, TRUE);
+ if (fdout != -1)
+ close (fdout);
+ if (fdin != -1)
+ mc_close (fdin);
+ return NULL;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+static int
+mc_def_ungetlocalcopy (const vfs_path_t * filename_vpath,
+ const vfs_path_t * local_vpath, gboolean has_changed)
+{
+ int fdin = -1, fdout = -1;
+ const char *local;
+
+ local = vfs_path_get_last_path_str (local_vpath);
+
+ if (has_changed)
+ {
+ char buffer[BUF_1K * 8];
+ ssize_t i;
+
+ if (vfs_path_get_last_path_vfs (filename_vpath)->write == NULL)
+ goto failed;
+
+ fdin = open (local, O_RDONLY);
+ if (fdin == -1)
+ goto failed;
+ fdout = mc_open (filename_vpath, O_WRONLY | O_TRUNC);
+ if (fdout == -1)
+ goto failed;
+ while ((i = read (fdin, buffer, sizeof (buffer))) > 0)
+ if (mc_write (fdout, buffer, (size_t) i) != i)
+ goto failed;
+ if (i == -1)
+ goto failed;
+
+ if (close (fdin) == -1)
+ {
+ fdin = -1;
+ goto failed;
+ }
+ fdin = -1;
+ if (mc_close (fdout) == -1)
+ {
+ fdout = -1;
+ goto failed;
+ }
+ }
+ unlink (local);
+ return 0;
+
+ failed:
+ message (D_ERROR, _("Changes to file lost"), "%s", vfs_path_get_last_path_str (filename_vpath));
+ if (fdout != -1)
+ mc_close (fdout);
+ if (fdin != -1)
+ close (fdin);
+ unlink (local);
+ return (-1);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/*** public functions ****************************************************************************/
+/* --------------------------------------------------------------------------------------------- */
+
+int
+mc_open (const vfs_path_t * vpath, int flags, ...)
+{
+ int result = -1;
+ mode_t mode = 0;
+ struct vfs_class *me;
+
+ if (vpath == NULL)
+ return (-1);
+
+ /* Get the mode flag */
+ if ((flags & O_CREAT) != 0)
+ {
+ va_list ap;
+
+ va_start (ap, flags);
+ /* We have to use PROMOTED_MODE_T instead of mode_t. Doing 'va_arg (ap, mode_t)'
+ * fails on systems where 'mode_t' is smaller than 'int' because of C's "default
+ * argument promotions". */
+ mode = va_arg (ap, PROMOTED_MODE_T);
+ va_end (ap);
+ }
+
+ me = VFS_CLASS (vfs_path_get_last_path_vfs (vpath));
+ if (me != NULL && me->open != NULL)
+ {
+ void *info;
+
+ /* open must be supported */
+ info = me->open (vpath, flags, mode);
+ if (info == NULL)
+ errno = vfs_ferrno (me);
+ else
+ result = vfs_new_handle (me, info);
+ }
+ else
+ errno = ENOTSUP;
+
+ return result;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/* *INDENT-OFF* */
+
+#define MC_NAMEOP(name, inarg, callarg) \
+int mc_##name inarg \
+{ \
+ int result; \
+ struct vfs_class *me; \
+\
+ if (vpath == NULL) \
+ return (-1); \
+\
+ me = VFS_CLASS (vfs_path_get_last_path_vfs (vpath)); \
+ if (me == NULL) \
+ return (-1); \
+\
+ result = me->name != NULL ? me->name callarg : -1; \
+ if (result == -1) \
+ errno = me->name != NULL ? vfs_ferrno (me) : ENOTSUP; \
+ return result; \
+}
+
+MC_NAMEOP (chmod, (const vfs_path_t *vpath, mode_t mode), (vpath, mode))
+MC_NAMEOP (chown, (const vfs_path_t *vpath, uid_t owner, gid_t group), (vpath, owner, group))
+MC_NAMEOP (fgetflags, (const vfs_path_t *vpath, unsigned long *flags), (vpath, flags))
+MC_NAMEOP (fsetflags, (const vfs_path_t *vpath, unsigned long flags), (vpath, flags))
+MC_NAMEOP (utime, (const vfs_path_t *vpath, mc_timesbuf_t * times), (vpath, times))
+MC_NAMEOP (readlink, (const vfs_path_t *vpath, char *buf, size_t bufsiz), (vpath, buf, bufsiz))
+MC_NAMEOP (unlink, (const vfs_path_t *vpath), (vpath))
+MC_NAMEOP (mkdir, (const vfs_path_t *vpath, mode_t mode), (vpath, mode))
+MC_NAMEOP (rmdir, (const vfs_path_t *vpath), (vpath))
+MC_NAMEOP (mknod, (const vfs_path_t *vpath, mode_t mode, dev_t dev), (vpath, mode, dev))
+
+/* *INDENT-ON* */
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+mc_symlink (const vfs_path_t * vpath1, const vfs_path_t * vpath2)
+{
+ int result = -1;
+
+ if (vpath1 != NULL && vpath2 != NULL)
+ {
+ struct vfs_class *me;
+
+ me = VFS_CLASS (vfs_path_get_last_path_vfs (vpath2));
+ if (me != NULL)
+ {
+ result = me->symlink != NULL ? me->symlink (vpath1, vpath2) : -1;
+ if (result == -1)
+ errno = me->symlink != NULL ? vfs_ferrno (me) : ENOTSUP;
+ }
+ }
+ return result;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/* *INDENT-OFF* */
+
+#define MC_HANDLEOP(rettype, name, inarg, callarg) \
+rettype mc_##name inarg \
+{ \
+ struct vfs_class *vfs; \
+ void *fsinfo = NULL; \
+ rettype result; \
+\
+ if (handle == -1) \
+ return (-1); \
+\
+ vfs = vfs_class_find_by_handle (handle, &fsinfo); \
+ if (vfs == NULL) \
+ return (-1); \
+\
+ result = vfs->name != NULL ? vfs->name callarg : -1; \
+ if (result == -1) \
+ errno = vfs->name != NULL ? vfs_ferrno (vfs) : ENOTSUP; \
+ return result; \
+}
+
+MC_HANDLEOP (ssize_t, read, (int handle, void *buf, size_t count), (fsinfo, buf, count))
+MC_HANDLEOP (ssize_t, write, (int handle, const void *buf, size_t count), (fsinfo, buf, count))
+MC_HANDLEOP (int, fstat, (int handle, struct stat *buf), (fsinfo, buf))
+
+/* --------------------------------------------------------------------------------------------- */
+
+#define MC_RENAMEOP(name) \
+int mc_##name (const vfs_path_t *vpath1, const vfs_path_t *vpath2) \
+{ \
+ int result; \
+ struct vfs_class *me1, *me2; \
+\
+ if (vpath1 == NULL || vpath2 == NULL) \
+ return (-1); \
+\
+ me1 = VFS_CLASS (vfs_path_get_last_path_vfs (vpath1)); \
+ me2 = VFS_CLASS (vfs_path_get_last_path_vfs (vpath2)); \
+\
+ if (me1 == NULL || me2 == NULL || me1 != me2) \
+ { \
+ errno = EXDEV; \
+ return (-1); \
+ } \
+\
+ result = me1->name != NULL ? me1->name (vpath1, vpath2) : -1; \
+ if (result == -1) \
+ errno = me1->name != NULL ? vfs_ferrno (me1) : ENOTSUP; \
+ return result; \
+}
+
+MC_RENAMEOP (link)
+MC_RENAMEOP (rename)
+
+/* *INDENT-ON* */
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+mc_ctl (int handle, int ctlop, void *arg)
+{
+ struct vfs_class *vfs;
+ void *fsinfo = NULL;
+
+ vfs = vfs_class_find_by_handle (handle, &fsinfo);
+
+ return (vfs == NULL || vfs->ctl == NULL) ? 0 : vfs->ctl (fsinfo, ctlop, arg);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+mc_setctl (const vfs_path_t * vpath, int ctlop, void *arg)
+{
+ int result = -1;
+ struct vfs_class *me;
+
+ if (vpath == NULL)
+ vfs_die ("You don't want to pass NULL to mc_setctl.");
+
+ me = VFS_CLASS (vfs_path_get_last_path_vfs (vpath));
+ if (me != NULL)
+ result = me->setctl != NULL ? me->setctl (vpath, ctlop, arg) : 0;
+
+ return result;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+mc_close (int handle)
+{
+ struct vfs_class *vfs;
+ void *fsinfo = NULL;
+ int result;
+
+ if (handle == -1)
+ return (-1);
+
+ vfs = vfs_class_find_by_handle (handle, &fsinfo);
+ if (vfs == NULL || fsinfo == NULL)
+ return (-1);
+
+ if (handle < 3)
+ return close (handle);
+
+ if (vfs->close == NULL)
+ vfs_die ("VFS must support close.\n");
+ result = vfs->close (fsinfo);
+ vfs_free_handle (handle);
+ if (result == -1)
+ errno = vfs_ferrno (vfs);
+
+ return result;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+DIR *
+mc_opendir (const vfs_path_t * vpath)
+{
+ int handle, *handlep;
+ void *info;
+ vfs_path_element_t *path_element;
+
+ if (vpath == NULL)
+ return NULL;
+
+ path_element = (vfs_path_element_t *) vfs_path_get_by_index (vpath, -1);
+ if (!vfs_path_element_valid (path_element))
+ {
+ errno = ENOTSUP;
+ return NULL;
+ }
+
+ info = path_element->class->opendir ? path_element->class->opendir (vpath) : NULL;
+ if (info == NULL)
+ {
+ errno = path_element->class->opendir ? vfs_ferrno (path_element->class) : ENOTSUP;
+ return NULL;
+ }
+
+ path_element->dir.info = info;
+
+#ifdef HAVE_CHARSET
+ path_element->dir.converter = (path_element->encoding != NULL) ?
+ str_crt_conv_from (path_element->encoding) : str_cnv_from_term;
+ if (path_element->dir.converter == INVALID_CONV)
+ path_element->dir.converter = str_cnv_from_term;
+#endif
+
+ handle = vfs_new_handle (path_element->class, vfs_path_element_clone (path_element));
+
+ handlep = g_new (int, 1);
+ *handlep = handle;
+ return (DIR *) handlep;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+struct vfs_dirent *
+mc_readdir (DIR * dirp)
+{
+ int handle;
+ struct vfs_class *vfs;
+ void *fsinfo = NULL;
+ struct vfs_dirent *entry = NULL;
+ vfs_path_element_t *vfs_path_element;
+
+ if (dirp == NULL)
+ {
+ errno = EFAULT;
+ return NULL;
+ }
+
+ handle = *(int *) dirp;
+
+ vfs = vfs_class_find_by_handle (handle, &fsinfo);
+ if (vfs == NULL || fsinfo == NULL)
+ return NULL;
+
+ vfs_path_element = (vfs_path_element_t *) fsinfo;
+ if (vfs->readdir != NULL)
+ {
+ entry = vfs->readdir (vfs_path_element->dir.info);
+ if (entry == NULL)
+ return NULL;
+
+ g_string_set_size (vfs_str_buffer, 0);
+#ifdef HAVE_CHARSET
+ str_vfs_convert_from (vfs_path_element->dir.converter, entry->d_name, vfs_str_buffer);
+#else
+ g_string_assign (vfs_str_buffer, entry->d_name);
+#endif
+ vfs_dirent_assign (mc_readdir_result, vfs_str_buffer->str, entry->d_ino);
+ vfs_dirent_free (entry);
+ }
+ if (entry == NULL)
+ errno = vfs->readdir ? vfs_ferrno (vfs) : ENOTSUP;
+ return (entry != NULL) ? mc_readdir_result : NULL;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+mc_closedir (DIR * dirp)
+{
+ int handle;
+ struct vfs_class *vfs;
+ void *fsinfo = NULL;
+ int result = -1;
+
+ if (dirp == NULL)
+ return result;
+
+ handle = *(int *) dirp;
+
+ vfs = vfs_class_find_by_handle (handle, &fsinfo);
+ if (vfs != NULL && fsinfo != NULL)
+ {
+ vfs_path_element_t *vfs_path_element = (vfs_path_element_t *) fsinfo;
+
+#ifdef HAVE_CHARSET
+ if (vfs_path_element->dir.converter != str_cnv_from_term)
+ {
+ str_close_conv (vfs_path_element->dir.converter);
+ vfs_path_element->dir.converter = INVALID_CONV;
+ }
+#endif
+
+ result = vfs->closedir ? (*vfs->closedir) (vfs_path_element->dir.info) : -1;
+ vfs_free_handle (handle);
+ vfs_path_element_free (vfs_path_element);
+ }
+ g_free (dirp);
+ return result;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+/* *INDENT-OFF* */
+
+#define MC_STATOP(name) \
+int mc_##name (const vfs_path_t *vpath, struct stat *buf) \
+{ \
+ int result = -1; \
+ struct vfs_class *me; \
+\
+ if (vpath == NULL) \
+ return (-1); \
+\
+ me = VFS_CLASS (vfs_path_get_last_path_vfs (vpath)); \
+ if (me != NULL) \
+ { \
+ result = me->name ? me->name (vpath, buf) : -1; \
+ if (result == -1) \
+ errno = me->name ? vfs_ferrno (me) : ENOTSUP; \
+ } \
+\
+ return result; \
+}
+
+MC_STATOP (stat)
+MC_STATOP (lstat)
+
+/* --------------------------------------------------------------------------------------------- */
+
+vfs_path_t *
+mc_getlocalcopy (const vfs_path_t * pathname_vpath)
+{
+ vfs_path_t *result = NULL;
+ struct vfs_class *me;
+
+ if (pathname_vpath == NULL)
+ return NULL;
+
+ me = VFS_CLASS (vfs_path_get_last_path_vfs (pathname_vpath));
+ if (me != NULL)
+ {
+ result = me->getlocalcopy != NULL ?
+ me->getlocalcopy (pathname_vpath) : mc_def_getlocalcopy (pathname_vpath);
+ if (result == NULL)
+ errno = vfs_ferrno (me);
+ }
+ return result;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+int
+mc_ungetlocalcopy (const vfs_path_t * pathname_vpath, const vfs_path_t * local_vpath,
+ gboolean has_changed)
+{
+ int result = -1;
+ const struct vfs_class *me;
+
+ if (pathname_vpath == NULL)
+ return (-1);
+
+ me = vfs_path_get_last_path_vfs (pathname_vpath);
+ if (me != NULL)
+ result = me->ungetlocalcopy != NULL ?
+ me->ungetlocalcopy (pathname_vpath, local_vpath, has_changed) :
+ mc_def_ungetlocalcopy (pathname_vpath, local_vpath, has_changed);
+
+ return result;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * VFS chdir.
+ *
+ * @param vpath VFS path.
+ * May be NULL. In this case NULL is returned and errno set to 0.
+ *
+ * @return 0 on success, -1 on failure.
+ */
+
+int
+mc_chdir (const vfs_path_t * vpath)
+{
+ struct vfs_class *old_vfs;
+ vfsid old_vfsid;
+ int result;
+ struct vfs_class *me;
+ const vfs_path_element_t *path_element;
+ vfs_path_t *cd_vpath;
+
+ if (vpath == NULL)
+ {
+ errno = 0;
+ return (-1);
+ }
+
+ if (vpath->relative)
+ cd_vpath = vfs_path_to_absolute (vpath);
+ else
+ cd_vpath = vfs_path_clone (vpath);
+
+ me = VFS_CLASS (vfs_path_get_last_path_vfs (cd_vpath));
+ if (me == NULL)
+ {
+ errno = EINVAL;
+ goto error_end;
+ }
+
+ if (me->chdir == NULL)
+ {
+ errno = ENOTSUP;
+ goto error_end;
+ }
+
+ result = me->chdir (cd_vpath);
+ if (result == -1)
+ {
+ errno = vfs_ferrno (me);
+ goto error_end;
+ }
+
+ old_vfsid = vfs_getid (vfs_get_raw_current_dir ());
+ old_vfs = current_vfs;
+
+ /* Actually change directory */
+ vfs_set_raw_current_dir (cd_vpath);
+ current_vfs = me;
+
+ /* This function uses the new current_dir implicitly */
+ vfs_stamp_create (old_vfs, old_vfsid);
+
+ /* Sometimes we assume no trailing slash on cwd */
+ path_element = vfs_path_get_by_index (vfs_get_raw_current_dir (), -1);
+ if (vfs_path_element_valid (path_element))
+ {
+ if (*path_element->path != '\0')
+ {
+ char *p;
+
+ p = strchr (path_element->path, 0) - 1;
+ if (IS_PATH_SEP (*p) && p > path_element->path)
+ *p = '\0';
+ }
+
+#ifdef ENABLE_VFS_NET
+ {
+ struct vfs_s_super *super;
+
+ super = vfs_get_super_by_vpath (vpath);
+ if (super != NULL && super->path_element != NULL)
+ {
+ g_free (super->path_element->path);
+ super->path_element->path = g_strdup (path_element->path);
+ }
+ }
+#endif /* ENABLE_VFS_NET */
+ }
+
+ return 0;
+
+ error_end:
+ vfs_path_free (cd_vpath, TRUE);
+ return (-1);
+}
+
+/* --------------------------------------------------------------------------------------------- */
+
+off_t
+mc_lseek (int fd, off_t offset, int whence)
+{
+ struct vfs_class *vfs;
+ void *fsinfo = NULL;
+ off_t result;
+
+ if (fd == -1)
+ return (-1);
+
+ vfs = vfs_class_find_by_handle (fd, &fsinfo);
+ if (vfs == NULL)
+ return (-1);
+
+ result = vfs->lseek ? vfs->lseek (fsinfo, offset, whence) : -1;
+ if (result == -1)
+ errno = vfs->lseek ? vfs_ferrno (vfs) : ENOTSUP;
+ return result;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/* Following code heavily borrows from libiberty, mkstemps.c */
+/*
+ * Arguments:
+ * pname (output) - pointer to the name of the temp file (needs g_free).
+ * NULL if the function fails.
+ * prefix - part of the filename before the random part.
+ * Prepend $TMPDIR or /tmp if there are no path separators.
+ * suffix - if not NULL, part of the filename after the random part.
+ *
+ * Result:
+ * handle of the open file or -1 if couldn't open any.
+ */
+
+int
+mc_mkstemps (vfs_path_t ** pname_vpath, const char *prefix, const char *suffix)
+{
+ char *p1, *p2;
+ int fd;
+
+ if (strchr (prefix, PATH_SEP) != NULL)
+ p1 = g_strdup (prefix);
+ else
+ {
+ /* Add prefix first to find the position of XXXXXX */
+ p1 = g_build_filename (mc_tmpdir (), prefix, (char *) NULL);
+ }
+
+ p2 = g_strconcat (p1, "XXXXXX", suffix, (char *) NULL);
+ g_free (p1);
+
+ fd = g_mkstemp (p2);
+ if (fd >= 0)
+ *pname_vpath = vfs_path_from_str (p2);
+ else
+ {
+ *pname_vpath = NULL;
+ fd = -1;
+ }
+
+ g_free (p2);
+
+ return fd;
+}
+
+/* --------------------------------------------------------------------------------------------- */
+/**
+ * Return the directory where mc should keep its temporary files.
+ * This directory is (in Bourne shell terms) "${TMPDIR=/tmp}/mc-$USER"
+ * When called the first time, the directory is created if needed.
+ * The first call should be done early, since we are using fprintf()
+ * and not message() to report possible problems.
+ */
+
+const char *
+mc_tmpdir (void)
+{
+ static char buffer[PATH_MAX];
+ static const char *tmpdir = NULL;
+ const char *sys_tmp;
+ struct passwd *pwd;
+ struct stat st;
+ const char *error = NULL;
+
+ /* Check if already correctly initialized */
+ if (tmpdir != NULL && lstat (tmpdir, &st) == 0 && S_ISDIR (st.st_mode) &&
+ st.st_uid == getuid () && (st.st_mode & 0777) == 0700)
+ return tmpdir;
+
+ sys_tmp = getenv ("MC_TMPDIR");
+ if (sys_tmp == NULL || !IS_PATH_SEP (sys_tmp[0]))
+ {
+ sys_tmp = getenv ("TMPDIR");
+ if (sys_tmp == NULL || !IS_PATH_SEP (sys_tmp[0]))
+ sys_tmp = TMPDIR_DEFAULT;
+ }
+
+ pwd = getpwuid (getuid ());
+ if (pwd != NULL)
+ g_snprintf (buffer, sizeof (buffer), "%s/mc-%s", sys_tmp, pwd->pw_name);
+ else
+ g_snprintf (buffer, sizeof (buffer), "%s/mc-%lu", sys_tmp, (unsigned long) getuid ());
+
+ canonicalize_pathname (buffer);
+
+ /* Try to create directory */
+ if (mkdir (buffer, S_IRWXU) != 0)
+ {
+ if (errno == EEXIST && lstat (buffer, &st) == 0)
+ {
+ /* Sanity check for existing directory */
+ if (!S_ISDIR (st.st_mode))
+ error = _("%s is not a directory\n");
+ else if (st.st_uid != getuid ())
+ error = _("Directory %s is not owned by you\n");
+ else if (((st.st_mode & 0777) != 0700) && (chmod (buffer, 0700) != 0))
+ error = _("Cannot set correct permissions for directory %s\n");
+ }
+ else
+ {
+ fprintf (stderr,
+ _("Cannot create temporary directory %s: %s\n"),
+ buffer, unix_error_string (errno));
+ error = "";
+ }
+ }
+
+ if (error != NULL)
+ {
+ int test_fd;
+ char *fallback_prefix;
+ gboolean fallback_ok = FALSE;
+ vfs_path_t *test_vpath;
+
+ if (*error != '\0')
+ fprintf (stderr, error, buffer);
+
+ /* Test if sys_tmp is suitable for temporary files */
+ fallback_prefix = g_strdup_printf ("%s/mctest", sys_tmp);
+ test_fd = mc_mkstemps (&test_vpath, fallback_prefix, NULL);
+ g_free (fallback_prefix);
+ if (test_fd != -1)
+ {
+ close (test_fd);
+ test_fd = open (vfs_path_as_str (test_vpath), O_RDONLY);
+ if (test_fd != -1)
+ {
+ close (test_fd);
+ unlink (vfs_path_as_str (test_vpath));
+ fallback_ok = TRUE;
+ }
+ }
+
+ if (fallback_ok)
+ {
+ fprintf (stderr, _("Temporary files will be created in %s\n"), sys_tmp);
+ g_snprintf (buffer, sizeof (buffer), "%s", sys_tmp);
+ error = NULL;
+ }
+ else
+ {
+ fprintf (stderr, _("Temporary files will not be created\n"));
+ g_snprintf (buffer, sizeof (buffer), "%s", "/dev/null/");
+ }
+
+ vfs_path_free (test_vpath, TRUE);
+ fprintf (stderr, "%s\n", _("Press any key to continue..."));
+ getc (stdin);
+ }
+
+ tmpdir = buffer;
+
+ if (error == NULL)
+ g_setenv ("MC_TMPDIR", tmpdir, TRUE);
+
+ return tmpdir;
+}
+
+/* --------------------------------------------------------------------------------------------- */