1*4a5d661aSToomas Soome /*
2*4a5d661aSToomas Soome * Copyright (c) 1988, 1993
3*4a5d661aSToomas Soome * The Regents of the University of California. All rights reserved.
4*4a5d661aSToomas Soome *
5*4a5d661aSToomas Soome * This code is derived from software contributed to Berkeley by
6*4a5d661aSToomas Soome * Jeffrey Mogul.
7*4a5d661aSToomas Soome *
8*4a5d661aSToomas Soome * Redistribution and use in source and binary forms, with or without
9*4a5d661aSToomas Soome * modification, are permitted provided that the following conditions
10*4a5d661aSToomas Soome * are met:
11*4a5d661aSToomas Soome * 1. Redistributions of source code must retain the above copyright
12*4a5d661aSToomas Soome * notice, this list of conditions and the following disclaimer.
13*4a5d661aSToomas Soome * 2. Redistributions in binary form must reproduce the above copyright
14*4a5d661aSToomas Soome * notice, this list of conditions and the following disclaimer in the
15*4a5d661aSToomas Soome * documentation and/or other materials provided with the distribution.
16*4a5d661aSToomas Soome * 3. Neither the name of the University nor the names of its contributors
17*4a5d661aSToomas Soome * may be used to endorse or promote products derived from this software
18*4a5d661aSToomas Soome * without specific prior written permission.
19*4a5d661aSToomas Soome *
20*4a5d661aSToomas Soome * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21*4a5d661aSToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22*4a5d661aSToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23*4a5d661aSToomas Soome * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24*4a5d661aSToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25*4a5d661aSToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26*4a5d661aSToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27*4a5d661aSToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28*4a5d661aSToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29*4a5d661aSToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30*4a5d661aSToomas Soome * SUCH DAMAGE.
31*4a5d661aSToomas Soome */
32*4a5d661aSToomas Soome
33*4a5d661aSToomas Soome #if defined(LIBC_SCCS) && !defined(lint)
34*4a5d661aSToomas Soome static char sccsid[] = "@(#)swab.c 8.1 (Berkeley) 6/4/93";
35*4a5d661aSToomas Soome #endif /* LIBC_SCCS and not lint */
36*4a5d661aSToomas Soome #include <sys/cdefs.h>
37*4a5d661aSToomas Soome __FBSDID("$FreeBSD$");
38*4a5d661aSToomas Soome
39*4a5d661aSToomas Soome #include <unistd.h>
40*4a5d661aSToomas Soome
41*4a5d661aSToomas Soome void
swab(const void * __restrict from,void * __restrict to,ssize_t len)42*4a5d661aSToomas Soome swab(const void * __restrict from, void * __restrict to, ssize_t len)
43*4a5d661aSToomas Soome {
44*4a5d661aSToomas Soome unsigned long temp;
45*4a5d661aSToomas Soome int n;
46*4a5d661aSToomas Soome char *fp, *tp;
47*4a5d661aSToomas Soome
48*4a5d661aSToomas Soome if (len <= 0)
49*4a5d661aSToomas Soome return;
50*4a5d661aSToomas Soome n = len >> 1;
51*4a5d661aSToomas Soome fp = (char *)from;
52*4a5d661aSToomas Soome tp = (char *)to;
53*4a5d661aSToomas Soome #define STEP temp = *fp++,*tp++ = *fp++,*tp++ = temp
54*4a5d661aSToomas Soome /* round to multiple of 8 */
55*4a5d661aSToomas Soome for (; n & 0x7; --n)
56*4a5d661aSToomas Soome STEP;
57*4a5d661aSToomas Soome for (n >>= 3; n > 0; --n) {
58*4a5d661aSToomas Soome STEP; STEP; STEP; STEP;
59*4a5d661aSToomas Soome STEP; STEP; STEP; STEP;
60*4a5d661aSToomas Soome }
61*4a5d661aSToomas Soome }
62