Include <stdlib.h>.

[gnulib.git] / lib / same.c

diff --git a/lib/same.c b/lib/same.c
index 8dda9fd..d41cccc 100644 (file)
--- a/lib/same.c
+++ b/lib/same.c
@@ -1,3 +1,22 @@
+/* Determine whether two file names refer to the same file.
+   Copyright (C) 1997-2000, 2002-2003 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.
+
+   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, write to the Free Software Foundation,
+   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* written by Jim Meyering */
+
 #if HAVE_CONFIG_H
 # include <config.h>
 #endif
@@ -17,25 +36,24 @@
 extern int errno;
 #endif
 
-#include "same.h"
-#include "dirname.h"
-#include "error.h"
-
-#if ENABLE_NLS
-# include <libintl.h>
-# define _(Text) gettext (Text)
+#if HAVE_STRING_H
+# include <string.h>
 #else
-# define _(Text) Text
+# include <strings.h>
 #endif
 
-#define STREQ(a, b) (strcmp ((a), (b)) == 0)
+#include "same.h"
+#include "dirname.h"
+#include "error.h"
+#include "xalloc.h"
 
 #ifndef HAVE_DECL_FREE
+"this configure-time declaration test was not run"
+#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)
@@ -46,30 +64,41 @@ char *base_name PARAMS ((char const *));
 int
 same_name (const char *source, const char *dest)
 {
-  struct stat source_dir_stats;
-  struct stat dest_dir_stats;
-  char *source_dirname, *dest_dirname;
+  /* Compare the basenames.  */
+  char const *source_basename = base_name (source);
+  char const *dest_basename = base_name (dest);
+  size_t source_baselen = base_len (source_basename);
+  size_t dest_baselen = base_len (dest_basename);
 
-  source_dirname = dir_name (source);
-  dest_dirname = dir_name (dest);
-  if (source_dirname == NULL || dest_dirname == NULL)
-    error (1, 0, _("virtual memory exhausted"));
-
-  if (stat (source_dirname, &source_dir_stats))
+  if (source_baselen == dest_baselen
+      && memcmp (source_basename, dest_basename, dest_baselen) == 0)
     {
-      /* Shouldn't happen.  */
-      error (1, errno, "%s", source_dirname);
-    }
+      struct stat source_dir_stats;
+      struct stat dest_dir_stats;
+      char *source_dirname, *dest_dirname;
 
-  if (stat (dest_dirname, &dest_dir_stats))
-    {
-      /* Shouldn't happen.  */
-      error (1, errno, "%s", 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);
+       }
 
-  free (source_dirname);
-  free (dest_dirname);
+      free (source_dirname);
+      free (dest_dirname);
+
+      if (SAME_INODE (source_dir_stats, dest_dir_stats))
+       return 1;
+    }
 
-  return (SAME_INODE (source_dir_stats, dest_dir_stats)
-         && STREQ (base_name (source), base_name (dest)));
+  return 0;
 }