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#include <sys/cdefs.h>
20__FBSDID("$FreeBSD$");
21
22#include <errno.h>
23#include <libgen.h>
24#include <stdlib.h>
25#include <string.h>
26#include <sys/param.h>
27
28char *
29basename_r(const char *path, char *bname)
30{
31	const char *endp, *startp;
32	size_t len;
33
34	/* Empty or NULL string gets treated as "." */
35	if (path == NULL || *path == '\0') {
36		bname[0] = '.';
37		bname[1] = '\0';
38		return (bname);
39	}
40
41	/* Strip any trailing slashes */
42	endp = path + strlen(path) - 1;
43	while (endp > path && *endp == '/')
44		endp--;
45
46	/* All slashes becomes "/" */
47	if (endp == path && *endp == '/') {
48		bname[0] = '/';
49		bname[1] = '\0';
50		return (bname);
51	}
52
53	/* Find the start of the base */
54	startp = endp;
55	while (startp > path && *(startp - 1) != '/')
56		startp--;
57
58	len = endp - startp + 1;
59	if (len >= MAXPATHLEN) {
60		errno = ENAMETOOLONG;
61		return (NULL);
62	}
63	memcpy(bname, startp, len);
64	bname[len] = '\0';
65	return (bname);
66}
67
68char *
69basename(const char *path)
70{
71	static char *bname = NULL;
72
73	if (bname == NULL) {
74		bname = (char *)malloc(MAXPATHLEN);
75		if (bname == NULL)
76			return (NULL);
77	}
78	return (basename_r(path, bname));
79}
80