/* xgetcwd.c -- return current directory with unlimited length Copyright (C) 1992, 1996, 2000, 2003 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. 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, 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>. */ #if HAVE_CONFIG_H # include <config.h> #endif #include <stdlib.h> #include <stdio.h> #include <errno.h> #ifndef errno extern int errno; #endif #include <sys/types.h> #if HAVE_UNISTD_H # include <unistd.h> #endif #include "pathmax.h" #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 = (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; } }