1 /* $OpenBSD: getcwd.c,v 1.21 2016/05/07 19:48:00 guenther Exp $ */
2
3 /*
4 * Copyright (c) 2005 Marius Eriksen <marius@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <errno.h>
20 #include <limits.h>
21 #include <stdlib.h>
22 #include <unistd.h>
23
24 int __getcwd(char *buf, size_t len);
25 PROTO_NORMAL(__getcwd);
26
27 char *
getcwd(char * buf,size_t size)28 getcwd(char *buf, size_t size)
29 {
30 char *allocated = NULL;
31
32 if (buf != NULL && size == 0) {
33 errno = EINVAL;
34 return (NULL);
35 }
36
37 if (buf == NULL &&
38 (allocated = buf = malloc(size = PATH_MAX)) == NULL)
39 return (NULL);
40
41 if (__getcwd(buf, size) == -1) {
42 free(allocated);
43 return (NULL);
44 }
45
46 return (buf);
47 }
48 DEF_WEAK(getcwd);
49