/*      $OpenBSD: swab.c,v 1.9 2014/12/11 23:05:38 tedu Exp $ */
/*
 * Copyright (c) 2014 Ted Unangst <tedu@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include <unistd.h>

void
swab(const void *__restrict from, void *__restrict to, ssize_t len)
{
        const unsigned char *src = from;
        unsigned char *dst = to;
        unsigned char t0, t1;

        while (len > 1) {
                t0 = src[0];
                t1 = src[1];
                dst[0] = t1;
                dst[1] = t0;
                src += 2;
                dst += 2;
                len -= 2;
        }
}