1 files changed, 80 insertions, 0 deletions
diff --git a/contrib/cvs/lib/rename.c b/contrib/cvs/lib/rename.c
new file mode 100644
index 0000000..8dc0239
--- /dev/null
+++ b/contrib/cvs/lib/rename.c
@@ -0,0 +1,80 @@
+/* rename.c -- BSD compatible directory 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.  */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#ifndef STDC_HEADERS
+extern int errno;
+#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;
+  int pid, status;
+
+  if (stat (from, &from_stats) == 0)
+    {
+      /* We don't check existence_error because the systems which need it
+	 have rename().  */
+      if (CVS_UNLINK (to) && errno != ENOENT)
+	return -1;
+      if ((from_stats.st_mode & S_IFMT) == S_IFDIR)
+	{
+#ifdef MVDIR
+	  /* I don't think MVDIR ever gets defined, but I don't think
+	     it matters, because I don't think CVS ever calls rename()
+	     on directories.  */
+
+	  /* 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. */
+	      return status != 0 ? -1 : 0;
+	    }
+#else /* no MVDIR */
+	  error (1, 0, "internal error: cannot move directories");
+#endif /* no MVDIR */
+	}
+      else
+	{
+	  /* We don't check existence_error because the systems which need it
+	     have rename().  */
+	  if (link (from, to) == 0 && (CVS_UNLINK (from) == 0 || errno == ENOENT))
+	    return 0;
+	}
+    }
+  return -1;
+}