xref: /illumos-gate/usr/src/lib/libc/port/gen/basename.c (revision 4f364e7c95ee7fd9d5bbeddc1940e92405bb0e72)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 /*	Copyright (c) 1988 AT&T	*/
28 /*	  All Rights Reserved  	*/
29 
30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
31 
32 /*
33  *	Return pointer to the last element of a pathname.
34  */
35 
36 #pragma weak _basename = basename
37 
38 #include "lint.h"
39 #include <libgen.h>
40 #include <string.h>
41 #include <sys/types.h>
42 
43 char *
44 basename(char *s)
45 {
46 	char	*p;
47 
48 	if (!s || !*s)			/* zero or empty argument */
49 		return (".");
50 
51 	p = s + strlen(s);
52 	while (p != s && *--p == '/')	/* skip trailing /s */
53 		*p = '\0';
54 
55 	if (p == s && *p == '\0')		/* all slashes */
56 		return ("/");
57 
58 	while (p != s)
59 		if (*--p == '/')
60 			return (++p);
61 
62 	return (p);
63 }
64