1/*	$OpenBSD: basename.c,v 1.14 2005/08/08 08:05:33 espie Exp $	*/
2
3/*
4 * Copyright (c) 1997, 2004 Todd C. Miller <Todd.Miller@courtesan.com>
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/* OPENBSD ORIGINAL: lib/libc/gen/basename.c */
20
21#include "includes.h"
22#ifndef HAVE_BASENAME
23#include <errno.h>
24#include <string.h>
25
26char *
27basename(const char *path)
28{
29	static char bname[MAXPATHLEN];
30	size_t len;
31	const char *endp, *startp;
32
33	/* Empty or NULL string gets treated as "." */
34	if (path == NULL || *path == '\0') {
35		bname[0] = '.';
36		bname[1] = '\0';
37		return (bname);
38	}
39
40	/* Strip any trailing slashes */
41	endp = path + strlen(path) - 1;
42	while (endp > path && *endp == '/')
43		endp--;
44
45	/* All slashes becomes "/" */
46	if (endp == path && *endp == '/') {
47		bname[0] = '/';
48		bname[1] = '\0';
49		return (bname);
50	}
51
52	/* Find the start of the base */
53	startp = endp;
54	while (startp > path && *(startp - 1) != '/')
55		startp--;
56
57	len = endp - startp + 1;
58	if (len >= sizeof(bname)) {
59		errno = ENAMETOOLONG;
60		return (NULL);
61	}
62	memcpy(bname, startp, len);
63	bname[len] = '\0';
64	return (bname);
65}
66
67#endif /* !defined(HAVE_BASENAME) */
68