Import of GNU patch version 2.4.

1 files changed, 112 insertions, 0 deletions

diff --git a/contrib/patch/rename.c b/contrib/patch/rename.c
new file mode 100644
index 0000000..d04a8bc
--- /dev/null
+++ b/contrib/patch/rename.c
@@ -0,0 +1,112 @@
+/* BSD compatible rename and directory rename function for System V.
+   Copyright (C) 1988, 1990 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.  */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#ifndef errno
+extern int errno;
+#endif
+
+#if STAT_MACROS_BROKEN
+# undef S_ISDIR
+#endif
+
+#if !defined(S_ISDIR) && defined(S_IFDIR)
+# define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
+#endif
+
+/* Rename file FROM to file TO.
+   Return 0 if successful, -1 if not. */
+
+int
+rename (from, to)
+     char *from;
+     char *to;
+{
+  struct stat from_stats, to_stats;
+  int pid, status;
+
+  if (stat (from, &from_stats))
+    return -1;
+
+  /* Be careful not to unlink `from' if it happens to be equal to `to' or
+     (on filesystems that silently truncate filenames after 14 characters)
+     if `from' and `to' share the significant characters. */
+  if (stat (to, &to_stats))
+    {
+      if (errno != ENOENT)
+        return -1;
+    }
+  else
+    {
+      if ((from_stats.st_dev == to_stats.st_dev)
+          && (from_stats.st_ino == to_stats.st_ino))
+        /* `from' and `to' designate the same file on that filesystem. */
+        return 0;
+
+      if (unlink (to) && errno != ENOENT)
+        return -1;
+    }
+
+#ifdef MVDIR
+
+/* If MVDIR is defined, it should be the full filename of a setuid root
+   program able to link and unlink directories.  If MVDIR is not defined,
+   then the capability of renaming directories may be missing.  */
+
+  if (S_ISDIR (from_stats.st_mode))
+    {
+      /* Need a setuid root process to link and unlink directories. */
+      pid = fork ();
+      switch (pid)
+	{
+	case -1:		/* Error. */
+	  error (1, errno, "cannot fork");
+
+	case 0:			/* Child. */
+	  execl (MVDIR, "mvdir", from, to, (char *) 0);
+	  error (255, errno, "cannot run `%s'", MVDIR);
+
+	default:		/* Parent. */
+	  while (wait (&status) != pid)
+	    /* Do nothing. */ ;
+
+	  errno = 0;		/* mvdir printed the system error message. */
+	  if (status)
+	    return -1;
+	}
+    }
+  else
+
+#endif /* MVDIR */
+
+    {
+      if (link (from, to))
+	return -1;
+      if (unlink (from) && errno != ENOENT)
+	{
+	  unlink (to);
+	  return -1;
+	}
+    }
+  return 0;
+}