Imported from ../bash-4.0-rc1.tar.gz.

[platform/upstream/bash.git] / lib / sh / rename.c

diff --git a/lib/sh/rename.c b/lib/sh/rename.c
index 799cb69..e410b5e 100644 (file)
--- a/lib/sh/rename.c
+++ b/lib/sh/rename.c
@@ -2,26 +2,75 @@
  * rename - rename a file
  */
 
+/* Copyright (C) 1999 Free Software Foundation, Inc.
+
+   This file is part of GNU Bash, the Bourne Again SHell.
+
+   Bash 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.
+
+   Bash 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 Bash.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 #include <config.h>
 
 #if !defined (HAVE_RENAME)
 
 #include <bashtypes.h>
+#include <posixstat.h>
 
 #if defined (HAVE_UNISTD_H)
 #  include <unistd.h>
 #endif
+#include <errno.h>
 
 #include <stdc.h>
 
+#ifndef errno
+extern int errno;
+#endif
+
 int
 rename (from, to)
      const char *from, *to;
 {
-  unlink (to);
+  struct stat fb, tb;
+
+  if (stat (from, &fb) < 0)
+    return -1;  
+
+  if (stat (to, &tb) < 0)
+    {
+      if (errno != ENOENT)
+       return -1;
+    }
+  else
+    {
+      if (fb.st_dev == tb.st_dev && fb.st_ino == tb.st_ino)
+        return 0;              /* same file */
+      if (unlink (to) < 0 && errno != ENOENT)
+        return -1;
+    }
+
   if (link (from, to) < 0)
     return (-1);
-  unlink (from);
+
+  if (unlink (from) < 0 && errno != ENOENT)
+    {
+      int e = errno;
+      unlink (to);
+      errno = e;
+      return (-1);
+    }
+
   return (0);
 }
 #endif /* !HAVE_RENAME */