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htonl.c revision 1.1 
      1 /*	$NetBSD: htonl.c,v 1.1 2000/01/05 14:07:36 msaitoh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1990 The Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * William Jolitz.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *	This product includes software developed by the University of
     21  *	California, Berkeley and its contributors.
     22  * 4. Neither the name of the University nor the names of its contributors
     23  *    may be used to endorse or promote products derived from this software
     24  *    without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     36  * SUCH DAMAGE.
     37  *
     38  *	from: @(#)htonl.s	5.2 (Berkeley) 12/17/90
     39  */
     40 
     41 #include <sys/types.h>
     42 #include <machine/endian.h>
     43 #if defined(LIBC_SCCS)
     44 	__RCSID("$NetBSD: htonl.c,v 1.1 2000/01/05 14:07:36 msaitoh Exp $");
     45 #endif
     46 
     47 /* hostorder = htonl(netorder) */
     48 #if BYTE_ORDER == LITTLE_ENDIAN
     49 u_int32_t
     50 htonl(x)
     51 	u_int32_t x;
     52 {
     53 	u_int32_t y = 0;
     54 
     55 	__asm__("swap.b %1, %0" : "=r" (y) : "r" (x));
     56 	__asm__("swap.w %1, %0" : "=r" (y) : "r" (y));
     57 	__asm__("swap.b %1, %0" : "=r" (y) : "r" (y));
     58 	return y;
     59 }
     60 #endif
     61