1 files changed, 67 insertions, 0 deletions
diff --git a/lib/getcwd.c b/lib/getcwd.c
new file mode 100644
index 000000000..2b1d713ff
--- /dev/null
+++ b/lib/getcwd.c
@@ -0,0 +1,67 @@
+/* Provide a replacement for the POSIX getcwd function.
+   Copyright (C) 2003 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.  */
+
+/* written by Jim Meyering */
+
+#include <config.h>
+
+#include <stdlib.h>
+#include <string.h>
+
+#include <errno.h>
+#ifndef errno
+extern int errno;
+#endif
+
+#include <sys/types.h>
+
+#include "pathmax.h"
+#include "same.h"
+
+/* Undefine getcwd here so any prototype is not redefined to be a
+   prototype for rpl_getcwd.  */
+#undef getcwd
+
+/* Guess high, because that makes the test below more conservative.
+   But this is a kludge, because we should really use
+   pathconf (".", _PC_NAME_MAX).  But it's probably not worth the cost.  */
+#define KLUDGE_POSIX_NAME_MAX 255
+
+#define MAX_SAFE_LEN (PATH_MAX - 1 - KLUDGE_POSIX_NAME_MAX - 1)
+
+/* This is a wrapper for getcwd.
+   Some implementations (at least GNU libc 2.3.1) return non-NULL
+   for a working directory name longer than PATH_MAX, yet the returned
+   string is a strict prefix of the desired directory name.
+   Upon such a failure, free the offending string, set errno to
+   ENAMETOOLONG, and return NULL.  */
+
+char *
+rpl_getcwd (char *buf, size_t size)
+{
+  char *cwd = getcwd (buf, size);
+
+  if (cwd == NULL)
+    return NULL;
+
+  if (strlen (cwd) <= MAX_SAFE_LEN || same_name (cwd, "."))
+    return cwd;
+
+  free (cwd);
+  errno = ENAMETOOLONG;
+  return NULL;
+}