endian.h revision 1.5 
1/*	$NetBSD: endian.h,v 1.5 1996/04/09 20:56:45 jonathan Exp $	*/
2
3/*
4 * Copyright (c) 1987, 1991, 1993
5 *	The Regents of the University of California.  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	8.1 (Berkeley) 6/11/93
36 */
37
38#ifndef _ENDIAN_H_
39#define	_ENDIAN_H_
40
41/*
42 * Define _NOQUAD if the compiler does NOT support 64-bit integers.
43 */
44/* #define _NOQUAD */
45
46/*
47 * Define the order of 32-bit words in 64-bit words.
48 */
49#define _QUAD_HIGHWORD 1
50#define _QUAD_LOWWORD 0
51
52#ifndef _POSIX_SOURCE
53/*
54 * Definitions for byte order, according to byte significance from low
55 * address to high.
56 */
57#define	LITTLE_ENDIAN	1234	/* LSB first: i386, vax */
58#define	BIG_ENDIAN	4321	/* MSB first: 68000, ibm, net */
59#define	PDP_ENDIAN	3412	/* LSB first in word, MSW first in long */
60
61#define	BYTE_ORDER	LITTLE_ENDIAN
62
63#include <sys/cdefs.h>
64
65__BEGIN_DECLS
66u_int32_t	htonl __P((u_int32_t));
67
68
69u_int16_t	htons __P((u_int16_t));
70u_int32_t	ntohl __P((u_int32_t));
71u_int16_t	ntohs __P((u_int16_t));
72__END_DECLS
73
74/*
75 * Macros for network/external number representation conversion.
76 */
77#if BYTE_ORDER == BIG_ENDIAN && !defined(lint)
78#define	ntohl(x)	(x)
79#define	ntohs(x)	(x)
80#define	htonl(x)	(x)
81#define	htons(x)	(x)
82
83#define	NTOHL(x)	(x)
84#define	NTOHS(x)	(x)
85#define	HTONL(x)	(x)
86#define	HTONS(x)	(x)
87
88#else
89
90#define	NTOHL(x)	(x) = ntohl((u_int32_t)x)
91#define	NTOHS(x)	(x) = ntohs((u_int16_t)x)
92#define	HTONL(x)	(x) = htonl((u_int32_t)x)
93#define	HTONS(x)	(x) = htons((u_int16_t)x)
94#endif
95#endif /* ! _POSIX_SOURCE */
96#endif /* !_ENDIAN_H_ */
97