basename.c revision 113908 
1/*	$OpenBSD: basename.c,v 1.8 2002/06/09 05:03:59 deraadt Exp $	*/
2
3/*
4 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
19 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
21 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
23 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
24 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
26 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
27 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29#include "includes.h"
30
31#if !defined(HAVE_BASENAME)
32
33#ifndef lint
34static char rcsid[] = "$OpenBSD: basename.c,v 1.8 2002/06/09 05:03:59 deraadt Exp $";
35#endif /* not lint */
36
37char *
38basename(const char *path)
39{
40	static char bname[MAXPATHLEN];
41	register const char *endp, *startp;
42
43	/* Empty or NULL string gets treated as "." */
44	if (path == NULL || *path == '\0') {
45		(void)strlcpy(bname, ".", sizeof bname);
46		return(bname);
47	}
48
49	/* Strip trailing slashes */
50	endp = path + strlen(path) - 1;
51	while (endp > path && *endp == '/')
52		endp--;
53
54	/* All slashes become "/" */
55	if (endp == path && *endp == '/') {
56		(void)strlcpy(bname, "/", sizeof bname);
57		return(bname);
58	}
59
60	/* Find the start of the base */
61	startp = endp;
62	while (startp > path && *(startp - 1) != '/')
63		startp--;
64
65	if (endp - startp + 2 > sizeof(bname)) {
66		errno = ENAMETOOLONG;
67		return(NULL);
68	}
69	strlcpy(bname, startp, endp - startp + 2);
70	return(bname);
71}
72
73#endif /* !defined(HAVE_BASENAME) */
74