revert between 56095 -> 55830 in arch
[AROS.git] / compiler / posixc / swab.c
blobfd61affd81192f52a286970d192890d95dde604a
1 /*
2 * Copyright (c) 1988 Regents of the University of California.
3 * All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Jeffrey Mogul.
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.
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.
37 #if defined(LIBC_SCCS) && !defined(lint)
38 static char *rcsid = "$OpenBSD: swab.c,v 1.3 1998/02/10 02:19:48 deraadt Exp $";
39 #endif /* LIBC_SCCS and not lint */
41 /*****************************************************************************
43 NAME */
44 #include <unistd.h>
46 void swab(
48 /* SYNOPSIS */
49 const void *from,
50 void *to,
51 size_t len)
53 /* FUNCTION
55 INPUTS
57 RESULT
59 NOTES
61 EXAMPLE
63 BUGS
65 SEE ALSO
67 INTERNALS
69 ******************************************************************************/
71 register unsigned long temp;
72 register int n;
73 register char *fp, *tp;
75 n = (len >> 1) + 1;
76 fp = (char *)from;
77 tp = (char *)to;
78 #define STEP temp = *fp++,*tp++ = *fp++,*tp++ = temp
79 /* round to multiple of 8 */
80 while ((--n) & 07)
81 STEP;
82 n >>= 3;
83 while (--n >= 0) {
84 STEP; STEP; STEP; STEP;
85 STEP; STEP; STEP; STEP;