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 /*
31 * Return pointer to the directory name, stripping off the last
32 * component of the path.
33 * Works similar to /bin/dirname
34 */
35
36 #pragma weak _dirname = dirname
37
38 #include "lint.h"
39 #include <sys/types.h>
40 #include <string.h>
41
42 char *
dirname(char * s)43 dirname(char *s)
44 {
45 char *p;
46
47 if (!s || !*s) /* zero or empty argument */
48 return (".");
49
50 p = s + strlen(s);
51 while (p != s && *--p == '/') /* trim trailing /s */
52 ;
53
54 if (p == s && *p == '/')
55 return ("/");
56
57 while (p != s)
58 if (*--p == '/') {
59 while (*p == '/' && p != s)
60 p--;
61 *++p = '\0';
62 return (s);
63 }
64
65 return (".");
66 }
67