1 /* xgetcwd.c -- return current directory with unlimited length
3 Copyright (C) 1992, 1996, 2000, 2001, 2003, 2004 Free Software
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software Foundation,
18 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
28 #include <sys/types.h>
39 # define INITIAL_BUFFER_SIZE (PATH_MAX + 1)
41 # define getcwd(Buf, Max) getwd (Buf)
47 /* Return the current directory, newly allocated, assuming it fits
48 within PATH_MAX bytes -- this is a common system-imposed limit
50 Upon an out-of-memory error, call xalloc_die.
51 Upon any other type of error, return NULL. */
57 char *cwd = getcwd (NULL, 0);
58 if (! cwd && errno == ENOMEM)
63 /* The initial buffer size for the working directory. A power of 2
64 detects arithmetic overflow earlier, but is not required. */
65 # ifndef INITIAL_BUFFER_SIZE
66 # define INITIAL_BUFFER_SIZE 128
69 size_t buf_size = INITIAL_BUFFER_SIZE;
73 char *buf = xmalloc (buf_size);
74 char *cwd = getcwd (buf, buf_size);
80 if (saved_errno != ERANGE)