/*
 * 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 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */


#include <string.h>

#define isdot(x)        ((x[0] == '.') && (!x[1] || (x[1] == '/')))
#define isdotdot(x)     ((x[0] == '.') && (x[1] == '.') && \
                            (!x[2] || (x[2] == '/')))

void
canonize(char *file)
{
        char *pt, *last;
        int level;

        /* remove references such as "./" and "../" and "//" */
        for (pt = file; *pt; /* void */) {
                if (isdot(pt))
                        (void) strcpy(pt, pt[1] ? pt+2 : pt+1);
                else if (isdotdot(pt)) {
                        level = 0;
                        last = pt;
                        do {
                                level++;
                                last += 2;
                                if (*last)
                                        last++;
                        } while (isdotdot(last));
                        --pt; /* point to previous '/' */
                        while (level--) {
                                if (pt <= file)
                                        return;
                                while ((*--pt != '/') && (pt > file))
                                        ;
                        }
                        if (*pt == '/')
                                pt++;
                        (void) strcpy(pt, last);
                } else {
                        while (*pt && (*pt != '/'))
                                pt++;
                        if (*pt == '/') {
                                while (pt[1] == '/')
                                        (void) strcpy(pt, pt+1);
                                pt++;
                        }
                }
        }
        if ((--pt > file) && (*pt == '/'))
                *pt = '\0';
}

void
canonize_slashes(char *file)
{
        char *pt;

        /* remove references such as "//" */
        for (pt = file; *pt; /* void */) {
                while (*pt && (*pt != '/'))
                        pt++;
                if (*pt == '/') {
                        while (pt[1] == '/')
                                (void) strcpy(pt, pt+1);
                        pt++;
                }
        }
        if ((--pt > file) && (*pt == '/'))
                *pt = '\0';
}