/* xgetcwd.c -- return current directory with unlimited length
- Copyright (C) 1992, 1996, 2000, 2001, 2003 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ Copyright (C) 2001, 2003-2004, 2006-2007, 2009-2011 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.
+ the Free Software Foundation; either version 3 of the License, 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
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 David MacKenzie <djm@gnu.ai.mit.edu>. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
+/* Written by Jim Meyering. */
-#include <stdio.h>
-#include <errno.h>
-#ifndef errno
-extern int errno;
-#endif
+#include <config.h>
-#include <sys/types.h>
-
-#if HAVE_STDLIB_H
-# include <stdlib.h>
-#endif
-#if HAVE_UNISTD_H
-# include <unistd.h>
-#endif
+#include "xgetcwd.h"
-#if HAVE_GETCWD
-char *getcwd ();
-#else
-# include "pathmax.h"
-# define INITIAL_BUFFER_SIZE (PATH_MAX + 1)
-char *getwd ();
-# define getcwd(Buf, Max) getwd (Buf)
-#endif
+#include <errno.h>
+#include <unistd.h>
#include "xalloc.h"
-#include "xgetcwd.h"
-/* Return the current directory, newly allocated, assuming it fits
- within PATH_MAX bytes -- this is a common system-imposed limit
- on how getcwd works.
+/* Return the current directory, newly allocated.
Upon an out-of-memory error, call xalloc_die.
Upon any other type of error, return NULL. */
char *
xgetcwd (void)
{
-#if HAVE_GETCWD_NULL
char *cwd = getcwd (NULL, 0);
if (! cwd && errno == ENOMEM)
xalloc_die ();
return cwd;
-#else
-
- /* The initial buffer size for the working directory. A power of 2
- detects arithmetic overflow earlier, but is not required. */
-# ifndef INITIAL_BUFFER_SIZE
-# define INITIAL_BUFFER_SIZE 128
-# endif
-
- size_t buf_size = INITIAL_BUFFER_SIZE;
-
- while (1)
- {
- char *buf = xmalloc (buf_size);
- char *cwd = getcwd (buf, buf_size);
- int saved_errno;
- if (cwd)
- return cwd;
- saved_errno = errno;
- free (buf);
- if (saved_errno != ERANGE)
- return NULL;
- buf_size *= 2;
- if (buf_size == 0)
- xalloc_die ();
- }
-#endif
}