1 /* $OpenBSD: swab.c,v 1.9 2014/12/11 23:05:38 tedu Exp $ */ 2 /* 3 * Copyright (c) 2014 Ted Unangst <tedu@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 #include <unistd.h> 18 19 void 20 swab(const void *__restrict from, void *__restrict to, ssize_t len) 21 { 22 const unsigned char *src = from; 23 unsigned char *dst = to; 24 unsigned char t0, t1; 25 26 while (len > 1) { 27 t0 = src[0]; 28 t1 = src[1]; 29 dst[0] = t1; 30 dst[1] = t0; 31 src += 2; 32 dst += 2; 33 len -= 2; 34 } 35 } 36