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endian.h revision 1.2 
      1 /*	$NetBSD: endian.h,v 1.2 1994/10/26 08:02:04 cgd Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1987, 1991 Regents of the University of California.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *      This product includes software developed by the University of
     18  *      California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  *
     35  *      @(#)endian.h    7.8 (Berkeley) 4/3/91
     36  */
     37 
     38 /*
     39  * Definitions for byte order, according to byte significance from low
     40  * address to high.
     41  */
     42 #define LITTLE_ENDIAN   1234    /* LSB first: i386, vax */
     43 #define BIG_ENDIAN      4321    /* MSB first: 68000, ibm, net */
     44 #define PDP_ENDIAN      3412    /* LSB first in word, MSW first in long */
     45 
     46 #define _QUAD_HIGHWORD  1
     47 #define _QUAD_LOWWORD   0
     48 
     49 #define BYTE_ORDER      LITTLE_ENDIAN
     50 
     51 #include <sys/cdefs.h>
     52 
     53 __BEGIN_DECLS
     54 unsigned long   htonl __P((unsigned long));
     55 unsigned short  htons __P((unsigned short));
     56 unsigned long   ntohl __P((unsigned long));
     57 unsigned short  ntohs __P((unsigned short));
     58 __END_DECLS
     59 
     60 /*
     61  * Macros for network/external number representation conversion.
     62  */
     63 #if BYTE_ORDER == BIG_ENDIAN && !defined(lint)
     64 #define ntohl(x)        (x)
     65 #define ntohs(x)        (x)
     66 #define htonl(x)        (x)
     67 #define htons(x)        (x)
     68 
     69 #define NTOHL(x)        (x)
     70 #define NTOHS(x)        (x)
     71 #define HTONL(x)        (x)
     72 #define HTONS(x)        (x)
     73 
     74 #else
     75 
     76 #define NTOHL(x)        (x) = ntohl((u_long)x)
     77 #define NTOHS(x)        (x) = ntohs((u_short)x)
     78 #define HTONL(x)        (x) = htonl((u_long)x)
     79 #define HTONS(x)        (x) = htons((u_short)x)
     80 #endif
     81