80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
/* xgetcwd.c -- return current directory with unlimited length
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Copyright (C) 1992, 1996, 2000, 2001 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdio.h>
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#include <errno.h>
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#ifndef errno
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extern int errno;
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#endif
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#include <sys/types.h>
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#if HAVE_STDLIB_H
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# include <stdlib.h>
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#endif
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#if HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#if HAVE_GETCWD
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char *getcwd ();
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#else
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char *getwd ();
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# define getcwd(Buf, Max) getwd (Buf)
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#endif
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#include "xalloc.h"
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/* Return the current directory, newly allocated, arbitrarily long.
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Return NULL and set errno on error. */
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char *
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xgetcwd ()
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{
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#if defined __GLIBC__ && __GLIBC__ >= 2
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return getcwd (NULL, 0);
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#else
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size_t buf_size = 128; /* must be a power of 2 */
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char *buf = NULL;
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while (1)
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{
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char *cwd;
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buf = (char *) xrealloc (buf, buf_size);
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cwd = getcwd (buf, buf_size);
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if (cwd != NULL)
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return cwd;
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if (errno != ERANGE)
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{
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free (buf);
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return NULL;
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}
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buf_size *= 2;
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if (buf_size == 0)
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xalloc_die ();
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}
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#endif
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}
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