/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1988 AT&T */
/*        All Rights Reserved   */

/*
 *      Return pointer to the directory name, stripping off the last
 *      component of the path.
 *      Works similar to /bin/dirname
 */

#pragma weak _dirname = dirname

#include "lint.h"
#include <sys/types.h>
#include <string.h>

char *
dirname(char *s)
{
        char    *p;

        if (!s || !*s)                  /* zero or empty argument */
                return (".");

        p = s + strlen(s);
        while (p != s && *--p == '/')   /* trim trailing /s */
                ;

        if (p == s && *p == '/')
                return ("/");

        while (p != s)
                if (*--p == '/') {
                        while (*p == '/' && p != s)
                                p--;
                        *++p = '\0';
                        return (s);
                }

        return (".");
}