swabbytes.c
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上传日期:2007-01-06
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文件大小:1k
- /* @(#)swabbytes.c 1.4 96/02/04 Copyright 1988 J. Schilling */
- /*
- * swab bytes in memory
- *
- * Copyright (c) 1988 J. Schilling
- */
- /* This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2, or (at your option)
- * any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING. If not, write to
- * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- #include <standard.h>
- #define DO8(a) a;a;a;a;a;a;a;a;
- void swabbytes(vp, cnt)
- void *vp;
- register int cnt;
- {
- register char *bp = (char *)vp;
- register char c;
- cnt /= 2; /* even count only */
- while ((cnt -= 8) >= 0) {
- DO8(c = *bp++; bp[-1] = *bp; *bp++ = c;);
- }
- cnt += 8;
- while (--cnt >= 0) {
- c = *bp++; bp[-1] = *bp; *bp++ = c;
- }
- }