From: Paul Eggert Date: Thu, 23 Aug 2001 17:25:11 +0000 (+0000) Subject: Initial revision X-Git-Url: https://git.dogcows.com/gitweb?a=commitdiff_plain;h=f17ce7b6aea9a983d18da31462a55192af95adad;p=chaz%2Ftar Initial revision --- diff --git a/lib/xgetcwd.c b/lib/xgetcwd.c new file mode 100644 index 0000000..95d0ab9 --- /dev/null +++ b/lib/xgetcwd.c @@ -0,0 +1,89 @@ +/* xgetcwd.c -- return current directory with unlimited length + Copyright (C) 1992, 1996, 2000, 2001 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 . */ + +#if HAVE_CONFIG_H +# include +#endif + +#include +#include +#ifndef errno +extern int errno; +#endif + +#include +#include "pathmax.h" + +#if HAVE_GETCWD +char *getcwd (); +#else +char *getwd (); +# define getcwd(Buf, Max) getwd (Buf) +#endif + +extern void *xmalloc (); +extern char *xstrdup (); +extern void free (); + +/* Return the current directory, newly allocated, arbitrarily long. + Return NULL and set errno on error. */ + +char * +xgetcwd () +{ +#if defined __GLIBC__ && __GLIBC__ >= 2 + return getcwd (NULL, 0); +#else + 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 = 1300; + 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; + } +#endif +}