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