1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 1989 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 /* from UCB 4.2 83/06/27 */ 29 30 /* 31 * Swab bytes 32 * Jeffrey Mogul, Stanford 33 */ 34 35 void 36 swab(from, to, n) 37 register char *from, *to; 38 register int n; 39 { 40 register unsigned long temp; 41 42 if (n <= 1) 43 return; 44 n >>= 1; n++; 45 #define STEP temp = *from++,*to++ = *from++,*to++ = temp 46 /* round to multiple of 8 */ 47 while ((--n) & 07) 48 STEP; 49 n >>= 3; 50 while (--n >= 0) { 51 STEP; STEP; STEP; STEP; 52 STEP; STEP; STEP; STEP; 53 } 54 } 55