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Cream of the Crop 1
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DJLSR106.ARJ
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SWAB.C
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C/C++ Source or Header
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1992-03-02
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2KB
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53 lines
/* This is file SWAB.C */
/* This file may have been modified by DJ Delorie (Jan 1991). If so,
** these modifications are Coyright (C) 1991 DJ Delorie, 24 Kirsten Ave,
** Rochester NH, 03867-2954, USA.
*/
/*
* Copyright (c) 1988 Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Jeffrey Mogul.
*
* Redistribution and use in source and binary forms are permitted provided
* that: (1) source distributions retain this entire copyright notice and
* comment, and (2) distributions including binaries display the following
* acknowledgement: ``This product includes software developed by the
* University of California, Berkeley and its contributors'' in the
* documentation or other materials provided with the distribution and in
* all advertising materials mentioning features or use of this software.
* Neither the name of the University nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)swab.c 5.8 (Berkeley) 6/27/90";
#endif /* LIBC_SCCS and not lint */
#include <string.h>
void
swab(from, to, n)
register void *from, *to;
register int n;
{
register unsigned long temp;
n >>= 1; n++;
#define STEP temp = *(char *)from++,*(char *)to++ = *(char *)from++,*(char *)to++ = temp
/* round to multiple of 8 */
while ((--n) & 07)
STEP;
n >>= 3;
while (--n >= 0) {
STEP; STEP; STEP; STEP;
STEP; STEP; STEP; STEP;
}
}