xref: /onnv-gate/usr/src/lib/libc/port/gen/dirname.c (revision 6812:febeba71273d)
10Sstevel@tonic-gate /*
20Sstevel@tonic-gate  * CDDL HEADER START
30Sstevel@tonic-gate  *
40Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*6812Sraf  * Common Development and Distribution License (the "License").
6*6812Sraf  * You may not use this file except in compliance with the License.
70Sstevel@tonic-gate  *
80Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
90Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
100Sstevel@tonic-gate  * See the License for the specific language governing permissions
110Sstevel@tonic-gate  * and limitations under the License.
120Sstevel@tonic-gate  *
130Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
140Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
150Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
160Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
170Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
180Sstevel@tonic-gate  *
190Sstevel@tonic-gate  * CDDL HEADER END
200Sstevel@tonic-gate  */
21*6812Sraf 
220Sstevel@tonic-gate /*
23*6812Sraf  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
240Sstevel@tonic-gate  * Use is subject to license terms.
250Sstevel@tonic-gate  */
260Sstevel@tonic-gate 
270Sstevel@tonic-gate /*	Copyright (c) 1988 AT&T	*/
280Sstevel@tonic-gate /*	  All Rights Reserved  	*/
290Sstevel@tonic-gate 
30*6812Sraf #pragma ident	"%Z%%M%	%I%	%E% SMI"
310Sstevel@tonic-gate 
320Sstevel@tonic-gate /*
330Sstevel@tonic-gate  *	Return pointer to the directory name, stripping off the last
340Sstevel@tonic-gate  *	component of the path.
350Sstevel@tonic-gate  *	Works similar to /bin/dirname
360Sstevel@tonic-gate  */
370Sstevel@tonic-gate 
38*6812Sraf #pragma weak _dirname = dirname
39*6812Sraf 
40*6812Sraf #include "lint.h"
410Sstevel@tonic-gate #include <sys/types.h>
420Sstevel@tonic-gate #include <string.h>
430Sstevel@tonic-gate 
440Sstevel@tonic-gate char *
dirname(char * s)450Sstevel@tonic-gate dirname(char *s)
460Sstevel@tonic-gate {
470Sstevel@tonic-gate 	char	*p;
480Sstevel@tonic-gate 
490Sstevel@tonic-gate 	if (!s || !*s)			/* zero or empty argument */
500Sstevel@tonic-gate 		return (".");
510Sstevel@tonic-gate 
520Sstevel@tonic-gate 	p = s + strlen(s);
530Sstevel@tonic-gate 	while (p != s && *--p == '/')	/* trim trailing /s */
540Sstevel@tonic-gate 		;
550Sstevel@tonic-gate 
560Sstevel@tonic-gate 	if (p == s && *p == '/')
570Sstevel@tonic-gate 		return ("/");
580Sstevel@tonic-gate 
590Sstevel@tonic-gate 	while (p != s)
600Sstevel@tonic-gate 		if (*--p == '/') {
610Sstevel@tonic-gate 			while (*p == '/' && p != s)
620Sstevel@tonic-gate 				p--;
630Sstevel@tonic-gate 			*++p = '\0';
640Sstevel@tonic-gate 			return (s);
650Sstevel@tonic-gate 		}
660Sstevel@tonic-gate 
670Sstevel@tonic-gate 	return (".");
680Sstevel@tonic-gate }
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