cosmopolitan/libc/calls/getcwd.c

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/*-*- 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
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Permission to use, copy, modify, and/or distribute this software for
any purpose with or without fee is hereby granted, provided that the
above copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
PERFORMANCE OF THIS SOFTWARE.
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*/
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/sysv/errfuns.h"
/**
* Returns current working directory.
*
* @param buf is where UTF-8 NUL-terminated path string gets written,
* which may be NULL to ask this function to malloc a buffer
* @param size is number of bytes available in buf, e.g. PATH_MAX,
* which may be 0 if buf NULL
* @return buf containing system-normative path or NULL w/ errno
* @see get_current_dir_name() which is better
* @error ERANGE, EINVAL
*/
char *(getcwd)(char *buf, size_t size) {
if (buf) {
buf[0] = '\0';
if (!IsWindows()) {
int olderr = errno;
if (getcwd$sysv(buf, size) != NULL) {
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return buf;
} else if (IsXnu() && errno == ENOSYS) {
if (size >= 2) {
buf[0] = '.'; /* XXX: could put forth more effort */
buf[1] = '\0';
errno = olderr;
return buf;
} else {
erange();
}
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}
return NULL;
} else {
return getcwd$nt(buf, size);
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}
} else {
efault();
return NULL;
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}
}