basename.c revision 124208 
1/*	$OpenBSD: basename.c,v 1.11 2003/06/17 21:56:23 millert Exp $	*/
2
3/*
4 * Copyright (c) 1997 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 "includes.h"
20#ifndef HAVE_BASENAME
21
22#ifndef lint
23static char rcsid[] = "$OpenBSD: basename.c,v 1.11 2003/06/17 21:56:23 millert Exp $";
24#endif /* not lint */
25
26char *
27basename(const char *path)
28{
29	static char bname[MAXPATHLEN];
30	register const char *endp, *startp;
31
32	/* Empty or NULL string gets treated as "." */
33	if (path == NULL || *path == '\0') {
34		(void)strlcpy(bname, ".", sizeof bname);
35		return(bname);
36	}
37
38	/* Strip trailing slashes */
39	endp = path + strlen(path) - 1;
40	while (endp > path && *endp == '/')
41		endp--;
42
43	/* All slashes become "/" */
44	if (endp == path && *endp == '/') {
45		(void)strlcpy(bname, "/", sizeof bname);
46		return(bname);
47	}
48
49	/* Find the start of the base */
50	startp = endp;
51	while (startp > path && *(startp - 1) != '/')
52		startp--;
53
54	if (endp - startp + 2 > sizeof(bname)) {
55		errno = ENAMETOOLONG;
56		return(NULL);
57	}
58	strlcpy(bname, startp, endp - startp + 2);
59	return(bname);
60}
61
62#endif /* !defined(HAVE_BASENAME) */
63