158f0484fSRodney W. Grimes /* 258f0484fSRodney W. Grimes * Copyright (c) 1988, 1993 358f0484fSRodney W. Grimes * The Regents of the University of California. All rights reserved. 458f0484fSRodney W. Grimes * 558f0484fSRodney W. Grimes * This code is derived from software contributed to Berkeley by 658f0484fSRodney W. Grimes * Jeffrey Mogul. 758f0484fSRodney W. Grimes * 858f0484fSRodney W. Grimes * Redistribution and use in source and binary forms, with or without 958f0484fSRodney W. Grimes * modification, are permitted provided that the following conditions 1058f0484fSRodney W. Grimes * are met: 1158f0484fSRodney W. Grimes * 1. Redistributions of source code must retain the above copyright 1258f0484fSRodney W. Grimes * notice, this list of conditions and the following disclaimer. 1358f0484fSRodney W. Grimes * 2. Redistributions in binary form must reproduce the above copyright 1458f0484fSRodney W. Grimes * notice, this list of conditions and the following disclaimer in the 1558f0484fSRodney W. Grimes * documentation and/or other materials provided with the distribution. 1658f0484fSRodney W. Grimes * 3. All advertising materials mentioning features or use of this software 1758f0484fSRodney W. Grimes * must display the following acknowledgement: 1858f0484fSRodney W. Grimes * This product includes software developed by the University of 1958f0484fSRodney W. Grimes * California, Berkeley and its contributors. 2058f0484fSRodney W. Grimes * 4. Neither the name of the University nor the names of its contributors 2158f0484fSRodney W. Grimes * may be used to endorse or promote products derived from this software 2258f0484fSRodney W. Grimes * without specific prior written permission. 2358f0484fSRodney W. Grimes * 2458f0484fSRodney W. Grimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2558f0484fSRodney W. Grimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2658f0484fSRodney W. Grimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2758f0484fSRodney W. Grimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2858f0484fSRodney W. Grimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2958f0484fSRodney W. Grimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3058f0484fSRodney W. Grimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3158f0484fSRodney W. Grimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3258f0484fSRodney W. Grimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3358f0484fSRodney W. Grimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3458f0484fSRodney W. Grimes * SUCH DAMAGE. 3558f0484fSRodney W. Grimes */ 3658f0484fSRodney W. Grimes 3758f0484fSRodney W. Grimes #if defined(LIBC_SCCS) && !defined(lint) 3858f0484fSRodney W. Grimes static char sccsid[] = "@(#)swab.c 8.1 (Berkeley) 6/4/93"; 3958f0484fSRodney W. Grimes #endif /* LIBC_SCCS and not lint */ 40de5fe5d5SDavid E. O'Brien #include <sys/cdefs.h> 41de5fe5d5SDavid E. O'Brien __FBSDID("$FreeBSD$"); 4258f0484fSRodney W. Grimes 432f5cde3cSTom Rhodes #include <unistd.h> 4458f0484fSRodney W. Grimes 4558f0484fSRodney W. Grimes void 462f5cde3cSTom Rhodes swab(const void * __restrict from, void * __restrict to, ssize_t len) 4758f0484fSRodney W. Grimes { 488fb3f3f6SDavid E. O'Brien unsigned long temp; 498fb3f3f6SDavid E. O'Brien int n; 508fb3f3f6SDavid E. O'Brien char *fp, *tp; 5158f0484fSRodney W. Grimes 52c9ab23eeSRobert Drehmel n = len >> 1; 5358f0484fSRodney W. Grimes fp = (char *)from; 5458f0484fSRodney W. Grimes tp = (char *)to; 5558f0484fSRodney W. Grimes #define STEP temp = *fp++,*tp++ = *fp++,*tp++ = temp 5658f0484fSRodney W. Grimes /* round to multiple of 8 */ 57c9ab23eeSRobert Drehmel for (; n & 0x7; --n) 5858f0484fSRodney W. Grimes STEP; 59c9ab23eeSRobert Drehmel for (n >>= 3; n > 0; --n) { 6058f0484fSRodney W. Grimes STEP; STEP; STEP; STEP; 6158f0484fSRodney W. Grimes STEP; STEP; STEP; STEP; 6258f0484fSRodney W. Grimes } 6358f0484fSRodney W. Grimes } 64