lib/libc/arch/sh3/net/ntohl.c

   1 /*      $NetBSD: ntohl.c,v 1.3 2005/12/24 23:10:08 perry 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. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  *      from: @(#)ntohl.s       5.2 (Berkeley) 12/17/90
  35  */
  36
  37 #include <sys/types.h>
  38 #include <machine/endian.h>
  39 #if defined(LIBC_SCCS)
  40         __RCSID("$NetBSD: ntohl.c,v 1.3 2005/12/24 23:10:08 perry Exp $");
  41 #endif
  42
  43 /* netorder = ntohl(hostorder) */
  44 #if BYTE_ORDER == LITTLE_ENDIAN
  45 u_int32_t
  46 ntohl(x)
  47         u_int32_t x;
  48 {
  49         u_int32_t y = 0;
  50
  51         __asm("swap.b %1, %0" : "=r" (y) : "r" (x));
  52         __asm("swap.w %1, %0" : "=r" (y) : "r" (y));
  53         __asm("swap.b %1, %0" : "=r" (y) : "r" (y));
  54         return y;
  55 }
  56 #endif