source: trunk/minix/include/net/hton.h@ 10

Last change on this file since 10 was 9, checked in by Mattia Monga, 13 years ago

Minix 3.1.2a

File size: 2.4 KB
Line 
1/*
2The following macro definitions convert to and from the network standard byte
3order. The macros with their name in lower case guarantee to evaluate their
4argument exactly once. The function of the macros is encoded in their names;
5htons means convert a (unsigned) short in host byte order to network byte order.
6*/
7
8#ifndef _NET__HTON_H
9#define _NET__HTON_H
10
11#include <minix/sys_config.h>
12
13extern u16_t _tmp;
14extern u32_t _tmp_l;
15
16/* Find out about the byte order. */
17
18/* assume <minix/config.h> is included, let's check */
19#if (_MINIX_CHIP == 0)
20#include "_MINIX_CHIP macro not set, include <minix/config.h>"
21#endif
22
23#if (_MINIX_CHIP == _CHIP_INTEL)
24#define LITTLE_ENDIAN 1
25#endif
26
27#if (_MINIX_CHIP == _CHIP_M68000 || _MINIX_CHIP == _CHIP_SPARC)
28#define BIG_ENDIAN 1
29#endif
30
31#if (LITTLE_ENDIAN) && (BIG_ENDIAN)
32#include "both LITTLE_ENDIAN and BIG_ENDIAN are defined"
33 /* LITTLE_ENDIAN and BIG_ENDIAN are both defined */
34#endif
35
36#if !(LITTLE_ENDIAN) && !(BIG_ENDIAN)
37#include "neither LITTLE_ENDIAN nor BIG_ENDIAN is defined"
38 /* LITTLE_ENDIAN and BIG_ENDIAN are both NOT defined */
39#endif
40
41#if LITTLE_ENDIAN
42#define HTONS(x) ( ( (((unsigned short)(x)) >>8) & 0xff) | \
43 ((((unsigned short)(x)) & 0xff)<<8) )
44#define NTOHS(x) ( ( (((unsigned short)(x)) >>8) & 0xff) | \
45 ((((unsigned short)(x)) & 0xff)<<8) )
46#define HTONL(x) ((((x)>>24) & 0xffL) | (((x)>>8) & 0xff00L) | \
47 (((x)<<8) & 0xff0000L) | (((x)<<24) & 0xff000000L))
48#define NTOHL(x) ((((x)>>24) & 0xffL) | (((x)>>8) & 0xff00L) | \
49 (((x)<<8) & 0xff0000L) | (((x)<<24) & 0xff000000L))
50
51#if _WORD_SIZE > 2
52#define htons(x) (_tmp=(x), ((_tmp>>8) & 0xff) | ((_tmp<<8) & 0xff00))
53#define ntohs(x) (_tmp=(x), ((_tmp>>8) & 0xff) | ((_tmp<<8) & 0xff00))
54#define htonl(x) (_tmp_l=(x), ((_tmp_l>>24) & 0xffL) | \
55 ((_tmp_l>>8) & 0xff00L) | \
56 ((_tmp_l<<8) & 0xff0000L) | ((_tmp_l<<24) & 0xff000000L))
57#define ntohl(x) (_tmp_l=(x), ((_tmp_l>>24) & 0xffL) \
58 | ((_tmp_l>>8) & 0xff00L) | \
59 ((_tmp_l<<8) & 0xff0000L) | ((_tmp_l<<24) & 0xff000000L))
60
61#else /* _WORD_SIZE == 2 */
62/* The above macros are too unwieldy for a 16-bit machine. */
63u16_t htons(u16_t x);
64u16_t ntohs(u16_t x);
65u32_t htonl(u32_t x);
66u32_t ntohl(u32_t x);
67#endif /* _WORD_SIZE == 2 */
68
69#endif /* LITTLE_ENDIAN */
70
71#if BIG_ENDIAN
72#define htons(x) (x)
73#define HTONS(x) (x)
74#define ntohs(x) (x)
75#define NTOHS(x) (x)
76#define htonl(x) (x)
77#define HTONL(x) (x)
78#define ntohl(x) (x)
79#define NTOHL(x) (x)
80#endif /* BIG_ENDIAN */
81
82#endif /* _NET__HTON_H */
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