Add a GPL copyright notice.

[gnulib.git] / lib / save-cwd.c

diff --git a/lib/save-cwd.c b/lib/save-cwd.c
index 068ff0a..93b1fe8 100644 (file)
--- a/lib/save-cwd.c
+++ b/lib/save-cwd.c
@@ -1,5 +1,5 @@
 /* save-cwd.c -- Save and restore current working directory.
-   Copyright (C) 1995, 1997, 1998, 2003 Free Software Foundation, Inc.
+   Copyright (C) 1995, 1997, 1998, 2003, 2004 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
@@ -21,11 +21,9 @@
 # include "config.h"
 #endif
 
+#include <stdbool.h>
 #include <stdio.h>
-
-#ifdef STDC_HEADERS
-# include <stdlib.h>
-#endif
+#include <stdlib.h>
 
 #if HAVE_UNISTD_H
 # include <unistd.h>
@@ -38,9 +36,6 @@
 #endif
 
 #include <errno.h>
-#ifndef errno
-extern int errno;
-#endif
 
 #ifndef O_DIRECTORY
 # define O_DIRECTORY 0
@@ -62,14 +57,14 @@ extern int errno;
    support for fchdir, and getcwd is not robust or as efficient.
    So, we prefer to use the open/fchdir approach, but fall back on
    getcwd if necessary.  Some systems lack fchdir altogether: OS/2,
-   Cygwin (as of March 2003), SCO Xenix.  At least SunOS4 and Irix 5.3
+   Cygwin (as of March 2003), SCO Xenix.  At least SunOS 4 and Irix 5.3
    provide the function, yet it doesn't work for partitions on which
    auditing is enabled.  */
 
 int
 save_cwd (struct saved_cwd *cwd)
 {
-  static int have_working_fchdir = 1;
+  static bool have_working_fchdir = true;
 
   cwd->desc = -1;
   cwd->name = NULL;
@@ -79,7 +74,12 @@ save_cwd (struct saved_cwd *cwd)
 #if HAVE_FCHDIR
       cwd->desc = open (".", O_RDONLY | O_DIRECTORY);
       if (cwd->desc < 0)
-       return 1;
+       cwd->desc = open (".", O_WRONLY | O_DIRECTORY);
+      if (cwd->desc < 0)
+       {
+         cwd->name = xgetcwd ();
+         return cwd->name ? 0 : -1;
+       }
 
 # if __sun__ || sun
       /* On SunOS 4 and IRIX 5.3, fchdir returns EINVAL when auditing
@@ -90,7 +90,7 @@ save_cwd (struct saved_cwd *cwd)
            {
              close (cwd->desc);
              cwd->desc = -1;
-             have_working_fchdir = 0;
+             have_working_fchdir = false;
            }
          else
            {
@@ -98,13 +98,13 @@ save_cwd (struct saved_cwd *cwd)
              close (cwd->desc);
              cwd->desc = -1;
              errno = saved_errno;
-             return 1;
+             return -1;
            }
        }
 # endif /* __sun__ || sun */
 #else
 # define fchdir(x) (abort (), 0)
-      have_working_fchdir = 0;
+      have_working_fchdir = false;
 #endif
     }
 
@@ -112,22 +112,22 @@ save_cwd (struct saved_cwd *cwd)
     {
       cwd->name = xgetcwd ();
       if (cwd->name == NULL)
-       return 1;
+       return -1;
     }
   return 0;
 }
 
 /* Change to recorded location, CWD, in directory hierarchy.
-   Upon failure, return nonzero (errno is set by chdir or fchdir).
+   Upon failure, return -1 (errno is set by chdir or fchdir).
    Upon success, return zero.  */
 
 int
 restore_cwd (const struct saved_cwd *cwd)
 {
   if (0 <= cwd->desc)
-    return fchdir (cwd->desc) < 0;
+    return fchdir (cwd->desc);
   else
-    return chdir (cwd->name) < 0;
+    return chdir (cwd->name);
 }
 
 void