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 2004 Sun Microsystems, Inc.  All rights reserved.

    24  * Use is subject to license terms.

    25  */

    26 

    27 #pragma ident	"%Z%%M%	%I%	%E% SMI"

    28 

    29 /*	Copyright (c) 1988 AT&T	*/

    30 /*	  All Rights Reserved  	*/

    31 

    32 

    33 /*

    34  * Swab bytes

    35  */

    36 

    37 #pragma weak swab = _swab

    38 

    39 #include "synonyms.h"

    40 #include <sys/types.h>

    41 #include <stdlib.h>

    42 

    43 

    44 #define	STEP	(void)((temp = *from++), (*to++ = *from++), (*to++ = temp))

    45 

    46 void

    47 swab(const char *src, char *dest, ssize_t n)

    48 {

    49 	char temp;

    50 	const char *from = (const char *)src;

    51 	char *to = (char *)dest;

    52 

    53 	if (n <= 1)

    54 		return;

    55 	n >>= 1; n++;

    56 	/* round to multiple of 8 */

    57 	while ((--n) & 07)

    58 		STEP;

    59 	n >>= 3;

    60 	while (--n >= 0) {

    61 		STEP; STEP; STEP; STEP;

    62 		STEP; STEP; STEP; STEP;

    63 	}

    64 }