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endian.h revision 1.1 
      1 /*
      2  * Copyright (c) 1987, 1991 Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *      This product includes software developed by the University of
     16  *      California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  *
     33  *      @(#)endian.h    7.8 (Berkeley) 4/3/91
     34  *	$Id: endian.h,v 1.1 1994/08/02 20:20:17 ragge Exp $
     35  */
     36 
     37 /*
     38  * Definitions for byte order, according to byte significance from low
     39  * address to high.
     40  */
     41 #define LITTLE_ENDIAN   1234    /* LSB first: i386, vax */
     42 #define BIG_ENDIAN      4321    /* MSB first: 68000, ibm, net */
     43 #define PDP_ENDIAN      3412    /* LSB first in word, MSW first in long */
     44 
     45 #define _QUAD_HIGHWORD  1
     46 #define _QUAD_LOWWORD   0
     47 
     48 #define BYTE_ORDER      LITTLE_ENDIAN
     49 
     50 #include <sys/cdefs.h>
     51 
     52 __BEGIN_DECLS
     53 unsigned long   htonl __P((unsigned long));
     54 unsigned short  htons __P((unsigned short));
     55 unsigned long   ntohl __P((unsigned long));
     56 unsigned short  ntohs __P((unsigned short));
     57 __END_DECLS
     58 
     59 /*
     60  * Macros for network/external number representation conversion.
     61  */
     62 #if BYTE_ORDER == BIG_ENDIAN && !defined(lint)
     63 #define ntohl(x)        (x)
     64 #define ntohs(x)        (x)
     65 #define htonl(x)        (x)
     66 #define htons(x)        (x)
     67 
     68 #define NTOHL(x)        (x)
     69 #define NTOHS(x)        (x)
     70 #define HTONL(x)        (x)
     71 #define HTONS(x)        (x)
     72 
     73 #else
     74 
     75 #define NTOHL(x)        (x) = ntohl((u_long)x)
     76 #define NTOHS(x)        (x) = ntohs((u_short)x)
     77 #define HTONL(x)        (x) = htonl((u_long)x)
     78 #define HTONS(x)        (x) = htons((u_short)x)
     79 #endif
     80