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 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