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endian.h revision 1.3 
      1 /*	$NetBSD: endian.h,v 1.3 1996/02/13 17:04:58 christos 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	7.7 (Berkeley) 4/3/91
     36  */
     37 
     38 #ifndef _MACHINE_ENDIAN_H_
     39 #define _MACHINE_ENDIAN_H_
     40 
     41 #define _QUAD_HIGHWORD	0
     42 #define _QUAD_LOWWORD	1
     43 
     44 /*
     45  * Definitions for byte order, according to byte significance from low
     46  * address to high.
     47  */
     48 #define	LITTLE_ENDIAN	1234	/* LSB first: i386, vax */
     49 #define	BIG_ENDIAN	4321	/* MSB first: 68000, ibm, net */
     50 #define	PDP_ENDIAN	3412	/* LSB first in word, MSW first in long */
     51 
     52 #define	BYTE_ORDER	BIG_ENDIAN
     53 
     54 #include <sys/cdefs.h>
     55 
     56 __BEGIN_DECLS
     57 unsigned long	htonl __P((unsigned long));
     58 unsigned short	htons __P((unsigned short));
     59 unsigned long	ntohl __P((unsigned long));
     60 unsigned short	ntohs __P((unsigned short));
     61 __END_DECLS
     62 
     63 /*
     64  * Macros for network/external number representation conversion.
     65  */
     66 #if BYTE_ORDER == BIG_ENDIAN && !defined(lint)
     67 #define	ntohl(x)	(x)
     68 #define	ntohs(x)	(x)
     69 #define	htonl(x)	(x)
     70 #define	htons(x)	(x)
     71 
     72 #define	NTOHL(x)	(void) (x)
     73 #define	NTOHS(x)	(void) (x)
     74 #define	HTONL(x)	(void) (x)
     75 #define	HTONS(x)	(void) (x)
     76 
     77 #else
     78 
     79 #define	NTOHL(x)	(x) = ntohl((u_long)x)
     80 #define	NTOHS(x)	(x) = ntohs((u_short)x)
     81 #define	HTONL(x)	(x) = htonl((u_long)x)
     82 #define	HTONS(x)	(x) = htons((u_short)x)
     83 #endif
     84 
     85 #endif /* _MACHINE_ENDIAN_H_ */
     86