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endian.h revision 1.5 
      1 /*	$NetBSD: endian.h,v 1.5 1995/07/05 08:22:22 ragge 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 #ifndef _VAX_ENDIAN_H_
     39 #define _VAX_ENDIAN_H_
     40 
     41 #define _QUAD_HIGHWORD  1
     42 #define _QUAD_LOWWORD   0
     43 
     44 #ifndef _POSIX_SOURCE
     45 
     46 /*
     47  * Definitions for byte order, according to byte significance from low
     48  * address to high.
     49  */
     50 #define LITTLE_ENDIAN   1234    /* LSB first: i386, vax */
     51 #define BIG_ENDIAN      4321    /* MSB first: 68000, ibm, net */
     52 #define PDP_ENDIAN      3412    /* LSB first in word, MSW first in long */
     53 
     54 #define BYTE_ORDER      LITTLE_ENDIAN
     55 
     56 #include <sys/cdefs.h>
     57 
     58 __BEGIN_DECLS
     59 unsigned long   htonl __P((unsigned long));
     60 unsigned short  htons __P((unsigned short));
     61 unsigned long   ntohl __P((unsigned long));
     62 unsigned short  ntohs __P((unsigned short));
     63 __END_DECLS
     64 
     65 
     66 #ifdef	__GNUC__
     67 
     68 #define	__byte_swap_long_variable(x)	\
     69 ({ register unsigned long __x,__y = (x);\
     70 					\
     71 	__asm ("rotl	$-8,%1,%0;   	\
     72 		insv	%0,$16,$8,%0;	\
     73 		rotl	$8,%1,%1; 	\
     74 		movb	%1,%0"		\
     75 		: "&=r" (__x)		\
     76 		: "r" (__y)		\
     77 		: "cc" );		\
     78 	__x; })
     79 
     80 #define __byte_swap_word_variable(x)	\
     81 ({ register unsigned short __x = (x);	\
     82 	__asm ("insv	%1,$16,$8,%1;	\
     83 		rotl	$-8,%1,%1"	\
     84 		: "=r" (__x)		\
     85 		: "0" (__x)		\
     86 		: "cc");		\
     87 	__x; })
     88 
     89 
     90 #define __byte_swap_long(x)     __byte_swap_long_variable(x)
     91 #define __byte_swap_word(x)     __byte_swap_word_variable(x)
     92 
     93 #define	ntohl(x)        __byte_swap_long(x)
     94 #define ntohs(x)        __byte_swap_word(x)
     95 #define htonl(x)        __byte_swap_long(x)
     96 #define htons(x)        __byte_swap_word(x)
     97 
     98 #endif /* __GNUC__ */
     99 
    100 /*
    101  * Macros for network/external number representation conversion.
    102  */
    103 #define NTOHL(x)        (x) = ntohl((unsigned long)(x))
    104 #define NTOHS(x)        (x) = ntohs((unsigned long)(x))
    105 #define HTONL(x)        (x) = htonl((unsigned long)(x))
    106 #define HTONS(x)        (x) = htons((unsigned long)(x))
    107 
    108 #endif	/* _POSIX_SOURCE */
    109 
    110 #endif /* _VAX_ENDIAN_H_ */
    111