diff options
Diffstat (limited to 'lib/xgetcwd.c')
-rw-r--r-- | lib/xgetcwd.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/lib/xgetcwd.c b/lib/xgetcwd.c new file mode 100644 index 000000000..6e775e74b --- /dev/null +++ b/lib/xgetcwd.c @@ -0,0 +1,85 @@ +/* xgetcwd.c -- return current directory with unlimited length + Copyright (C) 1992 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +/* Written by David MacKenzie, djm@gnu.ai.mit.edu. */ + +#ifdef HAVE_CONFIG_H +#if defined (CONFIG_BROKETS) +/* We use <config.h> instead of "config.h" so that a compilation + using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h + (which it would do because it found this file in $srcdir). */ +#include <config.h> +#else +#include "config.h" +#endif +#endif + +#include <stdio.h> +#include <errno.h> +#ifndef errno +extern int errno; +#endif +#include <sys/types.h> +#include "pathmax.h" + +#if !defined(_POSIX_VERSION) && !defined(HAVE_GETCWD) +char *getwd (); +#define getcwd(buf, max) getwd (buf) +#else +char *getcwd (); +#endif + +/* Amount to increase buffer size by in each try. */ +#define PATH_INCR 32 + +char *xmalloc (); +char *xrealloc (); +void free (); + +/* Return the current directory, newly allocated, arbitrarily long. + Return NULL and set errno on error. */ + +char * +xgetcwd () +{ + char *cwd; + char *ret; + unsigned path_max; + + errno = 0; + path_max = (unsigned) PATH_MAX; + path_max += 2; /* The getcwd docs say to do this. */ + + cwd = xmalloc (path_max); + + errno = 0; + while ((ret = getcwd (cwd, path_max)) == NULL && errno == ERANGE) + { + path_max += PATH_INCR; + cwd = xrealloc (cwd, path_max); + errno = 0; + } + + if (ret == NULL) + { + int save_errno = errno; + free (cwd); + errno = save_errno; + return NULL; + } + return cwd; +} |