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      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 directory name, stripping off the last
     34  *	component of the path.
     35  *	Works similar to /bin/dirname
     36  */
     37 
     38 #pragma weak _dirname = dirname
     39 
     40 #include "lint.h"
     41 #include <sys/types.h>
     42 #include <string.h>
     43 
     44 char *
     45 dirname(char *s)
     46 {
     47 	char	*p;
     48 
     49 	if (!s || !*s)			/* zero or empty argument */
     50 		return (".");
     51 
     52 	p = s + strlen(s);
     53 	while (p != s && *--p == '/')	/* trim trailing /s */
     54 		;
     55 
     56 	if (p == s && *p == '/')
     57 		return ("/");
     58 
     59 	while (p != s)
     60 		if (*--p == '/') {
     61 			while (*p == '/' && p != s)
     62 				p--;
     63 			*++p = '\0';
     64 			return (s);
     65 		}
     66 
     67 	return (".");
     68 }
     69