1199767fToomas Soome/*
2199767fToomas Soome * Copyright (c) 1988, 1993
3199767fToomas Soome *	The Regents of the University of California.  All rights reserved.
4199767fToomas Soome *
5199767fToomas Soome * This code is derived from software contributed to Berkeley by
6199767fToomas Soome * Jeffrey Mogul.
7199767fToomas Soome *
8199767fToomas Soome * Redistribution and use in source and binary forms, with or without
9199767fToomas Soome * modification, are permitted provided that the following conditions
10199767fToomas Soome * are met:
11199767fToomas Soome * 1. Redistributions of source code must retain the above copyright
12199767fToomas Soome *    notice, this list of conditions and the following disclaimer.
13199767fToomas Soome * 2. Redistributions in binary form must reproduce the above copyright
14199767fToomas Soome *    notice, this list of conditions and the following disclaimer in the
15199767fToomas Soome *    documentation and/or other materials provided with the distribution.
16199767fToomas Soome * 3. Neither the name of the University nor the names of its contributors
17199767fToomas Soome *    may be used to endorse or promote products derived from this software
18199767fToomas Soome *    without specific prior written permission.
19199767fToomas Soome *
20199767fToomas Soome * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21199767fToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22199767fToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23199767fToomas Soome * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24199767fToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25199767fToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26199767fToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27199767fToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28199767fToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29199767fToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30199767fToomas Soome * SUCH DAMAGE.
31199767fToomas Soome */
32199767fToomas Soome
33199767fToomas Soome#if defined(LIBC_SCCS) && !defined(lint)
34199767fToomas Soomestatic char sccsid[] = "@(#)swab.c	8.1 (Berkeley) 6/4/93";
35199767fToomas Soome#endif /* LIBC_SCCS and not lint */
36199767fToomas Soome#include <sys/cdefs.h>
37199767fToomas Soome__FBSDID("$FreeBSD$");
38199767fToomas Soome
39199767fToomas Soome#include <unistd.h>
40199767fToomas Soome
41199767fToomas Soomevoid
42199767fToomas Soomeswab(const void * __restrict from, void * __restrict to, ssize_t len)
43199767fToomas Soome{
44199767fToomas Soome	unsigned long temp;
45199767fToomas Soome	int n;
46199767fToomas Soome	char *fp, *tp;
47199767fToomas Soome
48199767fToomas Soome	if (len <= 0)
49199767fToomas Soome		return;
50199767fToomas Soome	n = len >> 1;
51199767fToomas Soome	fp = (char *)from;
52199767fToomas Soome	tp = (char *)to;
53199767fToomas Soome#define	STEP	temp = *fp++,*tp++ = *fp++,*tp++ = temp
54199767fToomas Soome	/* round to multiple of 8 */
55199767fToomas Soome	for (; n & 0x7; --n)
56199767fToomas Soome		STEP;
57199767fToomas Soome	for (n >>= 3; n > 0; --n) {
58199767fToomas Soome		STEP; STEP; STEP; STEP;
59199767fToomas Soome		STEP; STEP; STEP; STEP;
60199767fToomas Soome	}
61199767fToomas Soome}
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