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/* xgetcwd.c -- return current directory with unlimited length
Copyright (C) 1992, 1996, 2000, 2003, 2005-2006, 2011, 2015-2016 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 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
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, see <http://www.gnu.org/licenses/>. */
/* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <unistd.h>
#include "pathmax.h"
/* In this file, PATH_MAX is the size of an initial memory allocation. */
#ifndef PATH_MAX
# define PATH_MAX 8192
#endif
#if HAVE_GETCWD
# ifdef VMS
/* We want the directory in Unix syntax, not in VMS syntax. */
# define getcwd(Buf, Max) (getcwd) (Buf, Max, 0)
# else
char *getcwd ();
# endif
#else
char *getwd ();
# define getcwd(Buf, Max) getwd (Buf)
#endif
#include "xalloc.h"
/* Return the current directory, newly allocated, arbitrarily long.
Return NULL and set errno on error. */
char *
xgetcwd ()
{
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 = XNMALLOC (path_max, char);
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;
}
}
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