/*
 * 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   */

/*
 * Swab bytes
 */

#pragma weak _swab = swab

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


#define STEP    (void)((temp = *from++), (*to++ = *from++), (*to++ = temp))

void
swab(const char *src, char *dest, ssize_t n)
{
        char temp;
        const char *from = (const char *)src;
        char *to = (char *)dest;

        if (n <= 1)
                return;
        n >>= 1; n++;
        /* round to multiple of 8 */
        while ((--n) & 07)
                STEP;
        n >>= 3;
        while (--n >= 0) {
                STEP; STEP; STEP; STEP;
                STEP; STEP; STEP; STEP;
        }
}