Merge from vendor branch HOSTAPD:
[dragonfly.git] / lib / libc / string / swab.c
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1/*
2 * Copyright (c) 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Jeffrey Mogul.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
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35 *
36 * @(#)swab.c 8.1 (Berkeley) 6/4/93
37 * $FreeBSD: src/lib/libc/string/swab.c,v 1.1.1.1.14.1 2001/07/09 23:30:07 obrien Exp $
bd4c62e8 38 * $DragonFly: src/lib/libc/string/swab.c,v 1.4 2005/09/18 16:32:34 asmodai Exp $
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39 */
40
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41#include <string.h>
42
43void
bd4c62e8 44swab(const void *from, void *to, size_t len)
984263bc 45{
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46 unsigned long temp;
47 int n;
48 char *fp, *tp;
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49
50 n = (len >> 1) + 1;
51 fp = (char *)from;
52 tp = (char *)to;
53#define STEP temp = *fp++,*tp++ = *fp++,*tp++ = temp
54 /* round to multiple of 8 */
55 while ((--n) & 07)
56 STEP;
57 n >>= 3;
58 while (--n >= 0) {
59 STEP; STEP; STEP; STEP;
60 STEP; STEP; STEP; STEP;
61 }
62}