getcwd.c
1.64 KB
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999-2003, 2005-2007, 2009-2012, 2014 Free Software
Foundation, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General
Public License along with this library. If not, see
<http://www.gnu.org/licenses/>. */
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
char *
mu_getcwd ()
{
char *ret;
unsigned path_max;
char buf[128];
errno = 0;
ret = getcwd (buf, sizeof (buf));
if (ret != NULL)
return strdup (buf);
if (errno != ERANGE)
return NULL;
path_max = 128;
path_max += 2; /* The getcwd docs say to do this. */
for (;;)
{
char *cwd = (char *) malloc (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;
}
/* oops? */
return NULL;
}