/* Return the canonical absolute name of a given file.
- Copyright (C) 1996-2005 Free Software Foundation, Inc.
+ Copyright (C) 1996-2009 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,
- 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
-
-#ifdef STDC_HEADERS
-# include <stdlib.h>
-#else
-void free ();
-#endif
-
-#if defined STDC_HEADERS || defined HAVE_STRING_H
-# include <string.h>
-#else
-# include <strings.h>
-#endif
-
-#if HAVE_SYS_PARAM_H
-# include <sys/param.h>
-#endif
-
-#include <sys/stat.h>
+#include <config.h>
-#if HAVE_UNISTD_H
-# include <unistd.h>
-#endif
+#include "canonicalize.h"
#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
-#include "cycle-check.h"
-#include "path-concat.h"
-#include "stat-macros.h"
+#include "areadlink.h"
+#include "file-set.h"
+#include "hash-triple.h"
+#include "pathmax.h"
#include "xalloc.h"
#include "xgetcwd.h"
-#ifndef __set_errno
-# define __set_errno(Val) errno = (Val)
-#endif
-
-/* If __PTRDIFF_TYPE__ is
- defined, as with GNU C, use that; that way we don't pollute the
- namespace with <stddef.h>'s symbols. Otherwise, if <stddef.h> is
- available, include it and use ptrdiff_t. In traditional C, long is
- the best that we can do. */
-
-#ifdef __PTRDIFF_TYPE__
-# define PTR_INT_TYPE __PTRDIFF_TYPE__
-#else
-# ifdef HAVE_STDDEF_H
-# include <stddef.h>
-# define PTR_INT_TYPE ptrdiff_t
-# else
-# define PTR_INT_TYPE long
-# endif
+#ifndef DOUBLE_SLASH_IS_DISTINCT_ROOT
+# define DOUBLE_SLASH_IS_DISTINCT_ROOT 0
#endif
-#include "canonicalize.h"
-#include "pathmax.h"
-#include "xreadlink.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 path
- separators ('/') or symlinks. All path components must exist.
+ does not contain any `.', `..' components nor any repeated file name
+ separators ('/') or symlinks. All components must exist.
The result is malloc'd. */
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 path is not absolute. */
- if (name[0] != '/')
- {
- char *wd;
-
- if (!(wd = xgetcwd ()))
- return NULL;
-
- extra_buf = path_concat (wd, name, NULL);
- name = extra_buf;
- free (wd);
- }
+ return canonicalize_filename_mode (name, CAN_EXISTING);
+}
+#endif /* !HAVE_CANONICALIZE_FILE_NAME */
- resolved_size = strlen (name);
- while (1)
+/* Return true if we've already seen the triple, <FILENAME, dev, ino>.
+ If *HT is not initialized, initialize it. */
+static bool
+seen_triple (Hash_table **ht, char const *filename, struct stat const *st)
+{
+ if (*ht == NULL)
{
- 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);
+ size_t initial_capacity = 7;
+ *ht = hash_initialize (initial_capacity,
+ NULL,
+ triple_hash,
+ triple_compare_ino_str,
+ triple_free);
+ if (*ht == NULL)
+ xalloc_die ();
}
- free (extra_buf);
-
- /* NUL-terminate the resulting name. */
- resolved[resolved_len] = '\0';
-
- return resolved;
-
-# else
-
- return canonicalize_filename_mode (name, CAN_EXISTING);
+ if (seen_file (*ht, filename, st))
+ return true;
-# endif /* !HAVE_RESOLVEPATH */
+ record_file (*ht, filename, st);
+ return false;
}
-#endif /* !HAVE_CANONICALIZE_FILE_NAME */
-/* Return the canonical absolute name of file NAME. A canonical name
- does not contain any `.', `..' components nor any repeated path
- separators ('/') or symlinks. Whether path components must exist
+/* 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 *
canonicalize_filename_mode (const char *name, canonicalize_mode_t can_mode)
{
- char *rpath, *dest, *extra_buf = NULL;
- const char *start, *end, *rpath_limit;
+ char *rname, *dest, *extra_buf = NULL;
+ char const *start;
+ char const *end;
+ char const *rname_limit;
size_t extra_len = 0;
- struct cycle_check_state cycle_state;
+ 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;
}
if (name[0] != '/')
{
- rpath = xgetcwd ();
- if (!rpath)
+ rname = xgetcwd ();
+ if (!rname)
return NULL;
- dest = strchr (rpath, '\0');
- if (dest - rpath < PATH_MAX)
+ dest = strchr (rname, '\0');
+ if (dest - rname < PATH_MAX)
{
- char *p = xrealloc (rpath, PATH_MAX);
- dest = p + (dest - rpath);
- rpath = p;
- rpath_limit = rpath + PATH_MAX;
+ char *p = xrealloc (rname, PATH_MAX);
+ dest = p + (dest - rname);
+ rname = p;
+ rname_limit = rname + PATH_MAX;
}
else
{
- rpath_limit = dest;
+ rname_limit = dest;
}
}
else
{
- rpath = xmalloc (PATH_MAX);
- rpath_limit = rpath + PATH_MAX;
- rpath[0] = '/';
- dest = rpath + 1;
+ rname = xmalloc (PATH_MAX);
+ rname_limit = rname + PATH_MAX;
+ rname[0] = '/';
+ dest = rname + 1;
+ if (DOUBLE_SLASH_IS_DISTINCT_ROOT && name[1] == '/')
+ *dest++ = '/';
}
- cycle_check_init (&cycle_state);
- for (start = end = name; *start; start = end)
+ for (start = name; *start; start = end)
{
- /* Skip sequence of multiple path-separators. */
+ /* Skip sequence of multiple file name separators. */
while (*start == '/')
++start;
- /* Find end of path component. */
+ /* Find end of component. */
for (end = start; *end && *end != '/'; ++end)
/* Nothing. */;
else if (end - start == 2 && start[0] == '.' && start[1] == '.')
{
/* Back up to previous component, ignore if at root already. */
- if (dest > rpath + 1)
+ if (dest > rname + 1)
while ((--dest)[-1] != '/');
+ if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rname + 1
+ && *dest == '/')
+ dest++;
}
else
{
if (dest[-1] != '/')
*dest++ = '/';
- if (dest + (end - start) >= rpath_limit)
+ if (dest + (end - start) >= rname_limit)
{
- PTR_INT_TYPE dest_offset = dest - rpath;
- size_t new_size = rpath_limit - rpath;
+ 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;
- rpath = xrealloc (rpath, new_size);
- rpath_limit = rpath + new_size;
+ rname = xrealloc (rname, new_size);
+ rname_limit = rname + new_size;
- dest = rpath + dest_offset;
+ dest = rname + dest_offset;
}
dest = memcpy (dest, start, end - start);
dest += end - start;
*dest = '\0';
- if (lstat (rpath, &st) < 0)
+ if (lstat (rname, &st) != 0)
{
+ saved_errno = errno;
if (can_mode == CAN_EXISTING)
goto error;
- if (can_mode == CAN_ALL_BUT_LAST && *end)
- goto error;
+ if (can_mode == CAN_ALL_BUT_LAST)
+ {
+ if (end[strspn (end, "/")] || saved_errno != ENOENT)
+ goto error;
+ continue;
+ }
st.st_mode = 0;
}
char *buf;
size_t n, len;
- if (cycle_check (&cycle_state, &st))
+ /* 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;
+ saved_errno = ELOOP;
+ goto error;
}
- buf = xreadlink (rpath, st.st_size);
+ buf = areadlink_with_size (rname, st.st_size);
if (!buf)
{
- if (can_mode == CAN_MISSING)
+ if (can_mode == CAN_MISSING && errno != ENOMEM)
continue;
- else
- goto error;
+ saved_errno = errno;
+ goto error;
}
n = strlen (buf);
name = end = memcpy (extra_buf, buf, n);
if (buf[0] == '/')
- dest = rpath + 1; /* It's an absolute symlink */
+ {
+ 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 > rpath + 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++;
+ }
free (buf);
}
{
if (!S_ISDIR (st.st_mode) && *end && (can_mode != CAN_MISSING))
{
- errno = ENOTDIR;
+ saved_errno = ENOTDIR;
goto error;
}
}
}
}
- if (dest > rpath + 1 && dest[-1] == '/')
+ if (dest > rname + 1 && dest[-1] == '/')
--dest;
+ if (DOUBLE_SLASH_IS_DISTINCT_ROOT && dest == rname + 1 && *dest == '/')
+ dest++;
*dest = '\0';
free (extra_buf);
- return rpath;
+ if (ht)
+ hash_free (ht);
+ return rname;
error:
free (extra_buf);
- free (rpath);
+ free (rname);
+ if (ht)
+ hash_free (ht);
+ errno = saved_errno;
return NULL;
}
projects / pspp / blobdiff