1/*
2 * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28/*
29 * @OSF_COPYRIGHT@
30 *
31 */
32
33#ifndef _MACHINE_ENDIAN_H_
34#define _MACHINE_ENDIAN_H_
35
36/*
37 * Definitions for byte order,
38 * according to byte significance from low address to high.
39 */
40#define	LITTLE_ENDIAN	1234	/* least-significant byte first (vax) */
41#define	BIG_ENDIAN	4321	/* most-significant byte first (IBM, net) */
42#define	PDP_ENDIAN	3412	/* LSB first in word, MSW first in long (pdp) */
43
44#define	BYTE_ORDER	LITTLE_ENDIAN	/* byte order on i386 */
45#define ENDIAN		LITTLE
46
47/*
48 * Macros for network/external number representation conversion.
49 * Use GNUC support to inline the byteswappers.
50 */
51
52#if !defined(ntohs)
53static __inline__ unsigned short	ntohs(unsigned short);
54static __inline__
55unsigned short
56ntohs(unsigned short w_int)
57{
58	register unsigned short w = w_int;
59	__asm__ volatile("xchgb	%h1,%b1" : "=q" (w) : "0" (w));
60	return (w);	/* zero-extend for compat */
61}
62#endif
63
64#if !defined(htons)
65unsigned short	htons(unsigned short);
66#define	htons	ntohs
67#endif
68
69#if !defined(ntohl)
70static __inline__ unsigned long	ntohl(unsigned long);
71static __inline__
72unsigned long
73ntohl(register unsigned long value)
74{
75	register unsigned long l = value;
76	__asm__ volatile("bswap %0" : "=r" (l) : "0" (l));
77	return l;
78}
79#endif
80
81#if !defined(htonl)
82unsigned long	htonl(unsigned long);
83#define htonl	ntohl
84#endif
85
86#define NTOHL(x)	(x) = ntohl((unsigned long)x)
87#define NTOHS(x)	(x) = ntohs((unsigned short)x)
88#define HTONL(x)	(x) = htonl((unsigned long)x)
89#define HTONS(x)	(x) = htons((unsigned short)x)
90
91#endif
92