cosmopolitan/libc/calls/hefty/get_current_dir_name.c

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2020-06-15 14:18:57 +00:00
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi
Copyright 2020 Justine Alexandra Roberts Tunney
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; version 2 of the License.
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., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "libc/bits/safemacros.h"
#include "libc/mem/mem.h"
#include "libc/runtime/runtime.h"
#include "libc/calls/calls.h"
#include "libc/sysv/errfuns.h"
/**
* Returns current working directory.
*
* If the PWD environment variable is set, that'll be returned (since
* it's faster than issuing a system call).
*
* @return pointer that must be free()'d, or NULL w/ errno
*/
nodiscard char *get_current_dir_name(void) {
char *buf, *res;
if ((res = getenv("PWD"))) return strdup(res);
if (!(buf = malloc(PATH_MAX))) return NULL;
if (!(res = (getcwd)(buf, PATH_MAX))) free(buf);
return res;
}