1*22028508SToomas Soome /*
2*22028508SToomas Soome * Copyright (c) 1988, 1993
3*22028508SToomas Soome * The Regents of the University of California. All rights reserved.
4*22028508SToomas Soome *
5*22028508SToomas Soome * This code is derived from software contributed to Berkeley by
6*22028508SToomas Soome * Jeffrey Mogul.
7*22028508SToomas Soome *
8*22028508SToomas Soome * Redistribution and use in source and binary forms, with or without
9*22028508SToomas Soome * modification, are permitted provided that the following conditions
10*22028508SToomas Soome * are met:
11*22028508SToomas Soome * 1. Redistributions of source code must retain the above copyright
12*22028508SToomas Soome * notice, this list of conditions and the following disclaimer.
13*22028508SToomas Soome * 2. Redistributions in binary form must reproduce the above copyright
14*22028508SToomas Soome * notice, this list of conditions and the following disclaimer in the
15*22028508SToomas Soome * documentation and/or other materials provided with the distribution.
16*22028508SToomas Soome * 3. Neither the name of the University nor the names of its contributors
17*22028508SToomas Soome * may be used to endorse or promote products derived from this software
18*22028508SToomas Soome * without specific prior written permission.
19*22028508SToomas Soome *
20*22028508SToomas Soome * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21*22028508SToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22*22028508SToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23*22028508SToomas Soome * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24*22028508SToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25*22028508SToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26*22028508SToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27*22028508SToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28*22028508SToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29*22028508SToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30*22028508SToomas Soome * SUCH DAMAGE.
31*22028508SToomas Soome */
32*22028508SToomas Soome
33*22028508SToomas Soome #if defined(LIBC_SCCS) && !defined(lint)
34*22028508SToomas Soome static char sccsid[] = "@(#)swab.c 8.1 (Berkeley) 6/4/93";
35*22028508SToomas Soome #endif /* LIBC_SCCS and not lint */
36*22028508SToomas Soome #include <sys/cdefs.h>
37*22028508SToomas Soome __FBSDID("$FreeBSD$");
38*22028508SToomas Soome
39*22028508SToomas Soome #include <unistd.h>
40*22028508SToomas Soome
41*22028508SToomas Soome void
swab(const void * __restrict from,void * __restrict to,ssize_t len)42*22028508SToomas Soome swab(const void * __restrict from, void * __restrict to, ssize_t len)
43*22028508SToomas Soome {
44*22028508SToomas Soome unsigned long temp;
45*22028508SToomas Soome int n;
46*22028508SToomas Soome char *fp, *tp;
47*22028508SToomas Soome
48*22028508SToomas Soome if (len <= 0)
49*22028508SToomas Soome return;
50*22028508SToomas Soome n = len >> 1;
51*22028508SToomas Soome fp = (char *)from;
52*22028508SToomas Soome tp = (char *)to;
53*22028508SToomas Soome #define STEP temp = *fp++,*tp++ = *fp++,*tp++ = temp
54*22028508SToomas Soome /* round to multiple of 8 */
55*22028508SToomas Soome for (; n & 0x7; --n)
56*22028508SToomas Soome STEP;
57*22028508SToomas Soome for (n >>= 3; n > 0; --n) {
58*22028508SToomas Soome STEP; STEP; STEP; STEP;
59*22028508SToomas Soome STEP; STEP; STEP; STEP;
60*22028508SToomas Soome }
61*22028508SToomas Soome }
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