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endian.h revision 1.3 
      1 /*
      2  * Copyright (c) 1990 The 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 
     34 /*
     35  *	from: @(#)endian.h	7.7 (Berkeley) 4/3/91
     36  *	$Id: endian.h,v 1.3 1993/12/02 15:02:50 briggs Exp $
     37  */
     38 
     39 /*
     40    ALICE
     41       BG 05/24/92,17:10:58
     42          I don't think we need to change this very much.
     43  */
     44 #ifndef _MACHINE_ENDIAN_H_
     45 #define _MACHINE_ENDIAN_H_
     46 
     47 #define _QUAD_HIGHWORD	0
     48 #define _QUAD_LOWWORD	1
     49 
     50 /*
     51  * Definitions for byte order, according to byte significance from low
     52  * address to high.
     53  */
     54 #define	LITTLE_ENDIAN	1234	/* LSB first: i386, vax */
     55 #define	BIG_ENDIAN	4321	/* MSB first: 68000, ibm, net */
     56 #define	PDP_ENDIAN	3412	/* LSB first in word, MSW first in long */
     57 
     58 #define	BYTE_ORDER	BIG_ENDIAN
     59 
     60 #include <sys/cdefs.h>
     61 
     62 #define __word_swap_long(x) \
     63 ({ register u_long X = (x); \
     64    asm ("swap %1" \
     65 	: "=r" (X) \
     66 	: "0" (X)); \
     67    X; })
     68 #if __GNUC__ >= 2
     69 #define __byte_swap_long(x) \
     70 ({ register u_long X = (x); \
     71    asm ("xchgb %h1, %b1\n\tswap %1\n\txchgb %h1, %b1" \
     72 	: "=q" (X) \
     73 	: "0" (X)); \
     74    X; })
     75 #define __byte_swap_word(x) \
     76 ({ register u_short X = (x); \
     77    asm ("xchgb %h1, %b1" \
     78 	: "=q" (X) \
     79 	: "0" (X)); \
     80    X; })
     81 #else /* __GNUC__ >= 2 */
     82 #define __byte_swap_long(x) \
     83 ({ register u_long X = (x); \
     84    asm ("rorw #8, %w1\n\tswap %1\n\trorw #8, %w1" \
     85 	: "=r" (X) \
     86 	: "0" (X)); \
     87    X; })
     88 #define __byte_swap_word(x) \
     89 ({ register u_short X = (x); \
     90    asm ("rorw #8, %w1" \
     91 	: "=r" (X) \
     92 	: "0" (X)); \
     93    X; })
     94 #endif /* __GNUC__ >= 2 */
     95 
     96 __BEGIN_DECLS
     97 unsigned long	htonl __P((unsigned long));
     98 unsigned short	htons __P((unsigned short));
     99 unsigned long	ntohl __P((unsigned long));
    100 unsigned short	ntohs __P((unsigned short));
    101 __END_DECLS
    102 
    103 /*
    104  * Macros for network/external number representation conversion.
    105  */
    106 #if BYTE_ORDER == BIG_ENDIAN && !defined(lint)
    107 #define	ntohl(x)	(x)
    108 #define	ntohs(x)	(x)
    109 #define	htonl(x)	(x)
    110 #define	htons(x)	(x)
    111 
    112 #define	NTOHL(x)	(x)
    113 #define	NTOHS(x)	(x)
    114 #define	HTONL(x)	(x)
    115 #define	HTONS(x)	(x)
    116 
    117 #else
    118 
    119 #define	ntohl	__byte_swap_long
    120 #define	ntohs	__byte_swap_word
    121 #define	htonl	__byte_swap_long
    122 #define	htons	__byte_swap_word
    123 
    124 #define	NTOHL(x)	(x) = ntohl((u_long)x)
    125 #define	NTOHS(x)	(x) = ntohs((u_short)x)
    126 #define	HTONL(x)	(x) = htonl((u_long)x)
    127 #define	HTONS(x)	(x) = htons((u_short)x)
    128 #endif
    129 
    130 #endif /* _MACHINE_ENDIAN_H_ */
    131