/* Determine whether two file names refer to the same file.
- Copyright (C) 1997-2000 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ Copyright (C) 1997, 1998, 1999, 2000, 2002, 2003, 2004, 2005, 2006 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 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; if not, write to the Free Software Foundation,
- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* written by Jim Meyering */
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
+#include <stdbool.h>
#include <stdio.h>
-#ifdef HAVE_UNISTD_H
-# include <unistd.h>
-#endif
-#if HAVE_STDLIB_H
-# include <stdlib.h>
-#endif
+#include <unistd.h>
+#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include <errno.h>
-#ifndef errno
-extern int errno;
-#endif
-#if HAVE_STRING_H
-# include <string.h>
-#else
-# include <strings.h>
+#include <string.h>
+
+#include <limits.h>
+#ifndef _POSIX_NAME_MAX
+# define _POSIX_NAME_MAX 14
#endif
#include "same.h"
#include "dirname.h"
#include "error.h"
+#include "same-inode.h"
#include "xalloc.h"
-#if ENABLE_NLS
-# include <libintl.h>
-# define _(Text) gettext (Text)
-#else
-# define _(Text) Text
-#endif
-
-#define STREQ(a, b) (strcmp ((a), (b)) == 0)
-
-#ifndef HAVE_DECL_FREE
-"this configure-time declaration test was not run"
+#ifndef MIN
+# define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
-#if !HAVE_DECL_FREE
-void free ();
-#endif
-
-char *base_name PARAMS ((char const *));
-
-#define SAME_INODE(Stat_buf_1, Stat_buf_2) \
- ((Stat_buf_1).st_ino == (Stat_buf_2).st_ino \
- && (Stat_buf_1).st_dev == (Stat_buf_2).st_dev)
/* Return nonzero if SOURCE and DEST point to the same name in the same
directory. */
-int
+bool
same_name (const char *source, const char *dest)
{
- struct stat source_dir_stats;
- struct stat dest_dir_stats;
- char *source_dirname, *dest_dirname;
-
- source_dirname = dir_name (source);
- dest_dirname = dir_name (dest);
- if (source_dirname == NULL || dest_dirname == NULL)
- xalloc_die ();
+ /* Compare the basenames. */
+ char const *source_basename = last_component (source);
+ char const *dest_basename = last_component (dest);
+ size_t source_baselen = base_len (source_basename);
+ size_t dest_baselen = base_len (dest_basename);
+ bool identical_basenames =
+ (source_baselen == dest_baselen
+ && memcmp (source_basename, dest_basename, dest_baselen) == 0);
+ bool compare_dirs = identical_basenames;
+ bool same = false;
+
+#if ! _POSIX_NO_TRUNC && HAVE_PATHCONF && defined _PC_NAME_MAX
+ /* This implementation silently truncates components of file names. If
+ the base names might be truncated, check whether the truncated
+ base names are the same, while checking the directories. */
+ size_t slen_max = HAVE_LONG_FILE_NAMES ? 255 : _POSIX_NAME_MAX;
+ size_t min_baselen = MIN (source_baselen, dest_baselen);
+ if (slen_max <= min_baselen
+ && memcmp (source_basename, dest_basename, slen_max) == 0)
+ compare_dirs = true;
+#endif
- if (stat (source_dirname, &source_dir_stats))
+ if (compare_dirs)
{
- /* Shouldn't happen. */
- error (1, errno, "%s", source_dirname);
- }
+ struct stat source_dir_stats;
+ struct stat dest_dir_stats;
+ char *source_dirname, *dest_dirname;
+
+ /* Compare the parent directories (via the device and inode numbers). */
+ source_dirname = dir_name (source);
+ dest_dirname = dir_name (dest);
+
+ if (stat (source_dirname, &source_dir_stats))
+ {
+ /* Shouldn't happen. */
+ error (1, errno, "%s", source_dirname);
+ }
+
+ if (stat (dest_dirname, &dest_dir_stats))
+ {
+ /* Shouldn't happen. */
+ error (1, errno, "%s", dest_dirname);
+ }
+
+ same = SAME_INODE (source_dir_stats, dest_dir_stats);
+
+#if ! _POSIX_NO_TRUNC && HAVE_PATHCONF && defined _PC_NAME_MAX
+ if (same && ! identical_basenames)
+ {
+ long name_max = (errno = 0, pathconf (dest_dirname, _PC_NAME_MAX));
+ if (name_max < 0)
+ {
+ if (errno)
+ {
+ /* Shouldn't happen. */
+ error (1, errno, "%s", dest_dirname);
+ }
+ same = false;
+ }
+ else
+ same = (name_max <= min_baselen
+ && memcmp (source_basename, dest_basename, name_max) == 0);
+ }
+#endif
- if (stat (dest_dirname, &dest_dir_stats))
- {
- /* Shouldn't happen. */
- error (1, errno, "%s", dest_dirname);
+ free (source_dirname);
+ free (dest_dirname);
}
- free (source_dirname);
- free (dest_dirname);
-
- return (SAME_INODE (source_dir_stats, dest_dir_stats)
- && STREQ (base_name (source), base_name (dest)));
+ return same;
}