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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 /* 33 * Swab bytes 34 */ 35 36 #pragma weak _swab = swab 37 38 #include "lint.h" 39 #include <sys/types.h> 40 #include <stdlib.h> 41 42 43 #define STEP (void)((temp = *from++), (*to++ = *from++), (*to++ = temp)) 44 45 void 46 swab(const char *src, char *dest, ssize_t n) 47 { 48 char temp; 49 const char *from = (const char *)src; 50 char *to = (char *)dest; 51 52 if (n <= 1) 53 return; 54 n >>= 1; n++; 55 /* round to multiple of 8 */ 56 while ((--n) & 07) 57 STEP; 58 n >>= 3; 59 while (--n >= 0) { 60 STEP; STEP; STEP; STEP; 61 STEP; STEP; STEP; STEP; 62 } 63 } 64