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)
53 static __inline__ unsigned short ntohs(unsigned short);
54 static __inline__
55 unsigned short
ntohs(unsigned short w_int)56 ntohs(unsigned short w_int)
57 {
58 return (unsigned short)((w_int << 8) | (w_int >> 8));
59 }
60 #endif
61
62 #if !defined(htons)
63 unsigned short htons(unsigned short);
64 #define htons ntohs
65 #endif
66
67 #if !defined(ntohl)
68 static __inline__ unsigned long ntohl(unsigned long);
69 static __inline__
70 unsigned long
ntohl(unsigned long value)71 ntohl(unsigned long value)
72 {
73 #if defined(__clang__)
74 return (unsigned long)__builtin_bswap32((unsigned int)value);
75 #else
76 unsigned long l = value;
77 __asm__ volatile ("bswap %0" : "=r" (l) : "0" (l));
78 return l;
79 #endif
80 }
81 #endif
82
83 #if !defined(htonl)
84 unsigned long htonl(unsigned long);
85 #define htonl ntohl
86 #endif
87
88 #define NTOHL(x) (x) = ntohl((unsigned long)x)
89 #define NTOHS(x) (x) = ntohs((unsigned short)x)
90 #define HTONL(x) (x) = htonl((unsigned long)x)
91 #define HTONS(x) (x) = htons((unsigned short)x)
92
93 #endif
94