endian.h revision 1.1 
1/*
2 * Copyright (c) 1992 Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Ralph Campbell.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * from: @(#)endian.h	7.5 (Berkeley) 2/21/93
37 * $Id: endian.h,v 1.1 1993/10/12 03:22:39 deraadt Exp $
38 */
39
40/*
41 * Define _NOQUAD if the compiler does NOT support 64-bit integers.
42 */
43/* #define _NOQUAD */
44
45/*
46 * Define the order of 32-bit words in 64-bit words.
47 */
48#define _QUAD_HIGHWORD 1
49#define _QUAD_LOWWORD 0
50
51#ifndef _POSIX_SOURCE
52/*
53 * Definitions for byte order, according to byte significance from low
54 * address to high.
55 */
56#define	LITTLE_ENDIAN	1234	/* LSB first: i386, vax */
57#define	BIG_ENDIAN	4321	/* MSB first: 68000, ibm, net */
58#define	PDP_ENDIAN	3412	/* LSB first in word, MSW first in long */
59
60#define	BYTE_ORDER	LITTLE_ENDIAN
61
62#include <sys/cdefs.h>
63
64__BEGIN_DECLS
65unsigned long	htonl __P((unsigned long));
66unsigned short	htons __P((unsigned short));
67unsigned long	ntohl __P((unsigned long));
68unsigned short	ntohs __P((unsigned short));
69__END_DECLS
70
71/*
72 * Macros for network/external number representation conversion.
73 */
74#if BYTE_ORDER == BIG_ENDIAN && !defined(lint)
75#define	ntohl(x)	(x)
76#define	ntohs(x)	(x)
77#define	htonl(x)	(x)
78#define	htons(x)	(x)
79
80#define	NTOHL(x)	(x)
81#define	NTOHS(x)	(x)
82#define	HTONL(x)	(x)
83#define	HTONS(x)	(x)
84
85#else
86
87#define	NTOHL(x)	(x) = ntohl((u_long)x)
88#define	NTOHS(x)	(x) = ntohs((u_short)x)
89#define	HTONL(x)	(x) = htonl((u_long)x)
90#define	HTONS(x)	(x) = htons((u_short)x)
91#endif
92#endif /* !_POSIX_SOURCE */
93