1199767f8SToomas Soome /*
2199767f8SToomas Soome * Copyright (c) 1988, 1993
3199767f8SToomas Soome * The Regents of the University of California. All rights reserved.
4199767f8SToomas Soome *
5199767f8SToomas Soome * This code is derived from software contributed to Berkeley by
6199767f8SToomas Soome * Jeffrey Mogul.
7199767f8SToomas Soome *
8199767f8SToomas Soome * Redistribution and use in source and binary forms, with or without
9199767f8SToomas Soome * modification, are permitted provided that the following conditions
10199767f8SToomas Soome * are met:
11199767f8SToomas Soome * 1. Redistributions of source code must retain the above copyright
12199767f8SToomas Soome * notice, this list of conditions and the following disclaimer.
13199767f8SToomas Soome * 2. Redistributions in binary form must reproduce the above copyright
14199767f8SToomas Soome * notice, this list of conditions and the following disclaimer in the
15199767f8SToomas Soome * documentation and/or other materials provided with the distribution.
16199767f8SToomas Soome * 3. Neither the name of the University nor the names of its contributors
17199767f8SToomas Soome * may be used to endorse or promote products derived from this software
18199767f8SToomas Soome * without specific prior written permission.
19199767f8SToomas Soome *
20199767f8SToomas Soome * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21199767f8SToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22199767f8SToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23199767f8SToomas Soome * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24199767f8SToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25199767f8SToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26199767f8SToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27199767f8SToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28199767f8SToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29199767f8SToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30199767f8SToomas Soome * SUCH DAMAGE.
31199767f8SToomas Soome */
32199767f8SToomas Soome
33199767f8SToomas Soome #if defined(LIBC_SCCS) && !defined(lint)
34199767f8SToomas Soome static char sccsid[] = "@(#)swab.c 8.1 (Berkeley) 6/4/93";
35199767f8SToomas Soome #endif /* LIBC_SCCS and not lint */
36199767f8SToomas Soome #include <sys/cdefs.h>
37199767f8SToomas Soome __FBSDID("$FreeBSD$");
38199767f8SToomas Soome
39199767f8SToomas Soome #include <unistd.h>
40199767f8SToomas Soome
41199767f8SToomas Soome void
swab(const void * __restrict from,void * __restrict to,ssize_t len)42199767f8SToomas Soome swab(const void * __restrict from, void * __restrict to, ssize_t len)
43199767f8SToomas Soome {
44199767f8SToomas Soome unsigned long temp;
45199767f8SToomas Soome int n;
46199767f8SToomas Soome char *fp, *tp;
47199767f8SToomas Soome
48199767f8SToomas Soome if (len <= 0)
49199767f8SToomas Soome return;
50199767f8SToomas Soome n = len >> 1;
51199767f8SToomas Soome fp = (char *)from;
52199767f8SToomas Soome tp = (char *)to;
53199767f8SToomas Soome #define STEP temp = *fp++,*tp++ = *fp++,*tp++ = temp
54199767f8SToomas Soome /* round to multiple of 8 */
55199767f8SToomas Soome for (; n & 0x7; --n)
56199767f8SToomas Soome STEP;
57199767f8SToomas Soome for (n >>= 3; n > 0; --n) {
58199767f8SToomas Soome STEP; STEP; STEP; STEP;
59199767f8SToomas Soome STEP; STEP; STEP; STEP;
60199767f8SToomas Soome }
61199767f8SToomas Soome }
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