/* xgetcwd.c -- return current directory with unlimited length
- Copyright (C) 1992, 1996, 2000 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ Copyright (C) 2001, 2003-2004, 2006-2007, 2009-2013 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>
-#include "pathmax.h"
+#include "xgetcwd.h"
-#if HAVE_GETCWD
-char *getcwd ();
-#else
-char *getwd ();
-# define getcwd(Buf, Max) getwd (Buf)
-#endif
+#include <errno.h>
+#include <unistd.h>
-extern void *xmalloc ();
-extern char *xstrdup ();
-extern void free ();
+#include "xalloc.h"
-/* Return the current directory, newly allocated, arbitrarily long.
- Return NULL and set errno on error. */
+/* 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 ()
+xgetcwd (void)
{
- char *ret;
- unsigned path_max;
- char buf[1024];
-
- errno = 0;
- ret = getcwd (buf, sizeof (buf));
- if (ret != NULL)
- return xstrdup (buf);
- if (errno != ERANGE)
- return NULL;
-
- path_max = (unsigned) PATH_MAX;
- path_max += 2; /* The getcwd docs say to do this. */
-
- for (;;)
- {
- char *cwd = (char *) xmalloc (path_max);
-
- errno = 0;
- ret = getcwd (cwd, path_max);
- if (ret != NULL)
- return ret;
- if (errno != ERANGE)
- {
- int save_errno = errno;
- free (cwd);
- errno = save_errno;
- return NULL;
- }
-
- free (cwd);
-
- path_max += path_max / 16;
- path_max += 32;
- }
+ char *cwd = getcwd (NULL, 0);
+ if (! cwd && errno == ENOMEM)
+ xalloc_die ();
+ return cwd;
}