basename.c revision 126274 
1/* OPENBSD ORIGINAL: lib/libc/gen/basename.c */
2
3/*	$OpenBSD: basename.c,v 1.11 2003/06/17 21:56:23 millert Exp $	*/
4
5/*
6 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
7 *
8 * Permission to use, copy, modify, and distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19 */
20
21#include "includes.h"
22#ifndef HAVE_BASENAME
23
24#ifndef lint
25static char rcsid[] = "$OpenBSD: basename.c,v 1.11 2003/06/17 21:56:23 millert Exp $";
26#endif /* not lint */
27
28char *
29basename(const char *path)
30{
31	static char bname[MAXPATHLEN];
32	register const char *endp, *startp;
33
34	/* Empty or NULL string gets treated as "." */
35	if (path == NULL || *path == '\0') {
36		(void)strlcpy(bname, ".", sizeof bname);
37		return(bname);
38	}
39
40	/* Strip trailing slashes */
41	endp = path + strlen(path) - 1;
42	while (endp > path && *endp == '/')
43		endp--;
44
45	/* All slashes become "/" */
46	if (endp == path && *endp == '/') {
47		(void)strlcpy(bname, "/", sizeof bname);
48		return(bname);
49	}
50
51	/* Find the start of the base */
52	startp = endp;
53	while (startp > path && *(startp - 1) != '/')
54		startp--;
55
56	if (endp - startp + 2 > sizeof(bname)) {
57		errno = ENAMETOOLONG;
58		return(NULL);
59	}
60	strlcpy(bname, startp, endp - startp + 2);
61	return(bname);
62}
63
64#endif /* !defined(HAVE_BASENAME) */
65