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endian.h revision 1.1 
      1 /*	$NetBSD: endian.h,v 1.1 1999/09/13 10:31:17 itojun 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 
     42 /*
     43  * Definitions for byte order, according to byte significance from low
     44  * address to high.
     45  */
     46 #define	LITTLE_ENDIAN	1234	/* LSB first: i386, vax */
     47 #define	BIG_ENDIAN	4321	/* MSB first: 68000, ibm, net */
     48 #define	PDP_ENDIAN	3412	/* LSB first in word, MSW first in long */
     49 
     50 #ifndef _BYTE_ORDER
     51 #error Define _BYTE_ORDER!
     52 #endif
     53 #define	BYTE_ORDER	_BYTE_ORDER
     54 
     55 #if BYTE_ORDER == BIG_ENDIAN
     56 #define _QUAD_HIGHWORD	0
     57 #define _QUAD_LOWWORD	1
     58 #else
     59 #define _QUAD_HIGHWORD	1
     60 #define _QUAD_LOWWORD	0
     61 #endif
     62 
     63 #include <sys/cdefs.h>
     64 
     65 typedef u_int32_t	in_addr_t;
     66 typedef u_int16_t	in_port_t;
     67 
     68 __BEGIN_DECLS
     69 in_addr_t htonl __P((in_addr_t)) __attribute__((__const__));
     70 in_port_t htons __P((in_port_t)) __attribute__((__const__));
     71 in_addr_t ntohl __P((in_addr_t)) __attribute__((__const__));
     72 in_port_t ntohs __P((in_port_t)) __attribute__((__const__));
     73 __END_DECLS
     74 
     75 /*
     76  * Macros for network/external number representation conversion.
     77  */
     78 #if BYTE_ORDER == BIG_ENDIAN && !defined(lint)
     79 #define	ntohl(x)	(x)
     80 #define	ntohs(x)	(x)
     81 #define	htonl(x)	(x)
     82 #define	htons(x)	(x)
     83 
     84 #define	NTOHL(x)	(void) (x)
     85 #define	NTOHS(x)	(void) (x)
     86 #define	HTONL(x)	(void) (x)
     87 #define	HTONS(x)	(void) (x)
     88 
     89 #else
     90 
     91 #define	NTOHL(x)	(x) = ntohl((in_addr_t)x)
     92 #define	NTOHS(x)	(x) = ntohs((in_port_t)x)
     93 #define	HTONL(x)	(x) = htonl((in_addr_t)x)
     94 #define	HTONS(x)	(x) = htons((in_port_t)x)
     95 #endif
     96 
     97 #endif /* _MACHINE_ENDIAN_H_ */
     98