/* Return the canonical absolute name of a given file.
- Copyright (C) 1996-2007 Free Software Foundation, Inc.
+ Copyright (C) 1996-2010 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ 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.
+ 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
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,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include "canonicalize.h"
+#include <errno.h>
#include <stdlib.h>
#include <string.h>
-
-#if HAVE_SYS_PARAM_H
-# include <sys/param.h>
-#endif
-
#include <sys/stat.h>
-
#include <unistd.h>
-#include <errno.h>
-#include <stddef.h>
-
+#include "areadlink.h"
#include "file-set.h"
-#include "filenamecat.h"
#include "hash-triple.h"
+#include "pathmax.h"
#include "xalloc.h"
#include "xgetcwd.h"
-#ifndef ELOOP
-# define ELOOP 0
-#endif
-#ifndef __set_errno
-# define __set_errno(Val) errno = (Val)
+#ifndef DOUBLE_SLASH_IS_DISTINCT_ROOT
+# define DOUBLE_SLASH_IS_DISTINCT_ROOT 0
#endif
-#include "pathmax.h"
-#include "areadlink.h"
-
-#if !HAVE_CANONICALIZE_FILE_NAME
+#if !((HAVE_CANONICALIZE_FILE_NAME && FUNC_REALPATH_WORKS) \
+ || GNULIB_CANONICALIZE_LGPL)
/* Return the canonical absolute name of file NAME. A canonical name
does not contain any `.', `..' components nor any repeated file name
separators ('/') or symlinks. All components must exist.
char *
canonicalize_file_name (const char *name)
{
-# if HAVE_RESOLVEPATH
-
- char *resolved, *extra_buf = NULL;
- size_t resolved_size;
- ssize_t resolved_len;
-
- if (name == NULL)
- {
- __set_errno (EINVAL);
- return NULL;
- }
-
- if (name[0] == '\0')
- {
- __set_errno (ENOENT);
- return NULL;
- }
-
- /* All known hosts with resolvepath (e.g. Solaris 7) don't turn
- relative names into absolute ones, so prepend the working
- directory if the file name is not absolute. */
- if (name[0] != '/')
- {
- char *wd;
-
- if (!(wd = xgetcwd ()))
- return NULL;
-
- extra_buf = file_name_concat (wd, name, NULL);
- name = extra_buf;
- free (wd);
- }
-
- resolved_size = strlen (name);
- while (1)
- {
- resolved_size = 2 * resolved_size + 1;
- resolved = xmalloc (resolved_size);
- resolved_len = resolvepath (name, resolved, resolved_size);
- if (resolved_len < 0)
- {
- free (resolved);
- free (extra_buf);
- return NULL;
- }
- if (resolved_len < resolved_size)
- break;
- free (resolved);
- }
-
- free (extra_buf);
-
- /* NUL-terminate the resulting name. */
- resolved[resolved_len] = '\0';
-
- return resolved;
-
-# else
-
return canonicalize_filename_mode (name, CAN_EXISTING);
-
-# endif /* !HAVE_RESOLVEPATH */
}
#endif /* !HAVE_CANONICALIZE_FILE_NAME */
{
size_t initial_capacity = 7;
*ht = hash_initialize (initial_capacity,
- NULL,
- triple_hash,
- triple_compare,
- triple_free);
+ NULL,
+ triple_hash,
+ triple_compare_ino_str,
+ triple_free);
if (*ht == NULL)
- xalloc_die ();
+ xalloc_die ();
}
if (seen_file (*ht, filename, st))
return false;
}
-/* Return the canonical absolute name of file NAME. A canonical name
+/* Return the canonical absolute name of file NAME, while treating
+ missing elements according to CAN_MODE. A canonical name
does not contain any `.', `..' components nor any repeated file name
separators ('/') or symlinks. Whether components must exist
or not depends on canonicalize mode. The result is malloc'd. */
char const *rname_limit;
size_t extra_len = 0;
Hash_table *ht = NULL;
+ int saved_errno;
if (name == NULL)
{
- __set_errno (EINVAL);
+ errno = EINVAL;
return NULL;
}
if (name[0] == '\0')
{
- __set_errno (ENOENT);
+ errno = ENOENT;
return NULL;
}
{
rname = xgetcwd ();
if (!rname)
- return NULL;
+ return NULL;
dest = strchr (rname, '\0');
if (dest - rname < PATH_MAX)
- {
- char *p = xrealloc (rname, PATH_MAX);
- dest = p + (dest - rname);
- rname = p;
- rname_limit = rname + PATH_MAX;
- }
+ {
+ char *p = xrealloc (rname, PATH_MAX);
+ dest = p + (dest - rname);
+ rname = p;
+ rname_limit = rname + PATH_MAX;
+ }
else
- {
- rname_limit = dest;
- }
+ {
+ rname_limit = dest;
+ }
}
else
{
rname_limit = rname + PATH_MAX;
rname[0] = '/';
dest = rname + 1;
+ if (DOUBLE_SLASH_IS_DISTINCT_ROOT && name[1] == '/')
+ *dest++ = '/';
}
- for (start = end = name; *start; start = end)
+ for (start = name; *start; start = end)
{
/* Skip sequence of multiple file name separators. */
while (*start == '/')
- ++start;
+ ++start;
/* Find end of component. */
for (end = start; *end && *end != '/'; ++end)
- /* Nothing. */;
+ /* Nothing. */;
if (end - start == 0)
- break;
+ break;
else if (end - start == 1 && start[0] == '.')
- /* nothing */;
+ /* nothing */;
else if (end - start == 2 && start[0] == '.' && start[1] == '.')
- {
- /* Back up to previous component, ignore if at root already. */
- if (dest > rname + 1)
- while ((--dest)[-1] != '/');
- }
+ {
+ /* Back up to previous component, ignore if at root already. */
+ if (dest > rname + 1)
+ while ((--dest)[-1] != '/');
+ if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rname + 1
+ && *dest == '/')
+ dest++;
+ }
else
- {
- struct stat st;
-
- if (dest[-1] != '/')
- *dest++ = '/';
-
- if (dest + (end - start) >= rname_limit)
- {
- ptrdiff_t dest_offset = dest - rname;
- size_t new_size = rname_limit - rname;
-
- if (end - start + 1 > PATH_MAX)
- new_size += end - start + 1;
- else
- new_size += PATH_MAX;
- rname = xrealloc (rname, new_size);
- rname_limit = rname + new_size;
-
- dest = rname + dest_offset;
- }
-
- dest = memcpy (dest, start, end - start);
- dest += end - start;
- *dest = '\0';
-
- if (lstat (rname, &st) != 0)
- {
- if (can_mode == CAN_EXISTING)
- goto error;
- if (can_mode == CAN_ALL_BUT_LAST && *end)
- goto error;
- st.st_mode = 0;
- }
-
- if (S_ISLNK (st.st_mode))
- {
- char *buf;
- size_t n, len;
-
- /* Detect loops. We cannot use the cycle-check module here,
- since it's actually possible to encounter the same symlink
- more than once in a given traversal. However, encountering
- the same symlink,NAME pair twice does indicate a loop. */
- if (seen_triple (&ht, name, &st))
- {
- __set_errno (ELOOP);
- if (can_mode == CAN_MISSING)
- continue;
- else
- goto error;
- }
-
- buf = areadlink_with_size (rname, st.st_size);
- if (!buf)
- {
- if (can_mode == CAN_MISSING && errno != ENOMEM)
- continue;
- else
- goto error;
- }
-
- n = strlen (buf);
- len = strlen (end);
-
- if (!extra_len)
- {
- extra_len =
- ((n + len + 1) > PATH_MAX) ? (n + len + 1) : PATH_MAX;
- extra_buf = xmalloc (extra_len);
- }
- else if ((n + len + 1) > extra_len)
- {
- extra_len = n + len + 1;
- extra_buf = xrealloc (extra_buf, extra_len);
- }
-
- /* Careful here, end may be a pointer into extra_buf... */
- memmove (&extra_buf[n], end, len + 1);
- name = end = memcpy (extra_buf, buf, n);
-
- if (buf[0] == '/')
- dest = rname + 1; /* It's an absolute symlink */
- else
- /* Back up to previous component, ignore if at root already: */
- if (dest > rname + 1)
- while ((--dest)[-1] != '/');
-
- free (buf);
- }
- else
- {
- if (!S_ISDIR (st.st_mode) && *end && (can_mode != CAN_MISSING))
- {
- errno = ENOTDIR;
- goto error;
- }
- }
- }
+ {
+ struct stat st;
+
+ if (dest[-1] != '/')
+ *dest++ = '/';
+
+ if (dest + (end - start) >= rname_limit)
+ {
+ ptrdiff_t dest_offset = dest - rname;
+ size_t new_size = rname_limit - rname;
+
+ if (end - start + 1 > PATH_MAX)
+ new_size += end - start + 1;
+ else
+ new_size += PATH_MAX;
+ rname = xrealloc (rname, new_size);
+ rname_limit = rname + new_size;
+
+ dest = rname + dest_offset;
+ }
+
+ dest = memcpy (dest, start, end - start);
+ dest += end - start;
+ *dest = '\0';
+
+ if (lstat (rname, &st) != 0)
+ {
+ saved_errno = errno;
+ if (can_mode == CAN_EXISTING)
+ goto error;
+ if (can_mode == CAN_ALL_BUT_LAST)
+ {
+ if (end[strspn (end, "/")] || saved_errno != ENOENT)
+ goto error;
+ continue;
+ }
+ st.st_mode = 0;
+ }
+
+ if (S_ISLNK (st.st_mode))
+ {
+ char *buf;
+ size_t n, len;
+
+ /* Detect loops. We cannot use the cycle-check module here,
+ since it's actually possible to encounter the same symlink
+ more than once in a given traversal. However, encountering
+ the same symlink,NAME pair twice does indicate a loop. */
+ if (seen_triple (&ht, name, &st))
+ {
+ if (can_mode == CAN_MISSING)
+ continue;
+ saved_errno = ELOOP;
+ goto error;
+ }
+
+ buf = areadlink_with_size (rname, st.st_size);
+ if (!buf)
+ {
+ if (can_mode == CAN_MISSING && errno != ENOMEM)
+ continue;
+ saved_errno = errno;
+ goto error;
+ }
+
+ n = strlen (buf);
+ len = strlen (end);
+
+ if (!extra_len)
+ {
+ extra_len =
+ ((n + len + 1) > PATH_MAX) ? (n + len + 1) : PATH_MAX;
+ extra_buf = xmalloc (extra_len);
+ }
+ else if ((n + len + 1) > extra_len)
+ {
+ extra_len = n + len + 1;
+ extra_buf = xrealloc (extra_buf, extra_len);
+ }
+
+ /* Careful here, end may be a pointer into extra_buf... */
+ memmove (&extra_buf[n], end, len + 1);
+ name = end = memcpy (extra_buf, buf, n);
+
+ if (buf[0] == '/')
+ {
+ dest = rname + 1; /* It's an absolute symlink */
+ if (DOUBLE_SLASH_IS_DISTINCT_ROOT && buf[1] == '/')
+ *dest++ = '/';
+ }
+ else
+ {
+ /* Back up to previous component, ignore if at root
+ already: */
+ if (dest > rname + 1)
+ while ((--dest)[-1] != '/');
+ if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rname + 1
+ && *dest == '/')
+ dest++;
+ }
+
+ free (buf);
+ }
+ else
+ {
+ if (!S_ISDIR (st.st_mode) && *end && (can_mode != CAN_MISSING))
+ {
+ saved_errno = ENOTDIR;
+ goto error;
+ }
+ }
+ }
}
if (dest > rname + 1 && dest[-1] == '/')
--dest;
+ if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rname + 1 && *dest == '/')
+ dest++;
*dest = '\0';
+ if (rname_limit != dest + 1)
+ rname = xrealloc (rname, dest - rname + 1);
free (extra_buf);
if (ht)
free (rname);
if (ht)
hash_free (ht);
+ errno = saved_errno;
return NULL;
}