63 lines
3.0 KiB
C
63 lines
3.0 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Returns current working directory.
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*
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* @param buf is where UTF-8 NUL-terminated path string gets written,
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* which may be NULL to ask this function to malloc a buffer
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* @param size is number of bytes available in buf, e.g. PATH_MAX,
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* which may be 0 if buf NULL
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* @return buf containing system-normative path or NULL w/ errno
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* @see get_current_dir_name() which is better
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* @error ERANGE, EINVAL
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*/
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char *(getcwd)(char *buf, size_t size) {
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if (buf) {
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buf[0] = '\0';
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if (!IsWindows()) {
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int olderr = errno;
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if (getcwd$sysv(buf, size) != NULL) {
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return buf;
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} else if (IsXnu() && errno == ENOSYS) {
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if (size >= 2) {
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buf[0] = '.'; /* XXX: could put forth more effort */
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buf[1] = '\0';
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errno = olderr;
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return buf;
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} else {
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erange();
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}
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}
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return NULL;
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} else {
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return getcwd$nt(buf, size);
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}
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} else {
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efault();
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return NULL;
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}
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}
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