* stdlib-safer.h: New file from coreutils, required by

[gnulib.git] / lib / readlink.c

diff --git a/lib/readlink.c b/lib/readlink.c
index 72d0e04..3196aec 100644 (file)
--- a/lib/readlink.c
+++ b/lib/readlink.c
@@ -1,5 +1,5 @@
 /* Stub for readlink().
-   Copyright (C) 2003 Free Software Foundation, Inc.
+   Copyright (C) 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
@@ -13,23 +13,36 @@
 
    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.  */
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
 
-#if HAVE_CONFIG_H
+#ifdef HAVE_CONFIG_H
 # include <config.h>
 #endif
 
 #include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stddef.h>
 
 #if !HAVE_READLINK
 
 /* readlink() substitute for systems that don't have a readlink() function,
    such as DJGPP 2.03 and mingw32.  */
 
+/* The official POSIX return type of readlink() is ssize_t, but since here
+   we have no declaration in a public header file, we use 'int' as return
+   type.  */
+
 int
-readlink (const char *filename, char *buffer, size_t bufsize)
+readlink (const char *path, char *buf, size_t bufsize)
 {
-  errno = EINVAL;
+  struct stat statbuf;
+
+  /* In general we should use lstat() here, not stat().  But on platforms
+     without symbolic links lstat() - if it exists - would be equivalent to
+     stat(), therefore we can use stat().  This saves us a configure check.  */
+  if (stat (path, &statbuf) >= 0)
+    errno = EINVAL;
   return -1;
 }