blob: 59e96320f4367caa170c0e7553070180c134c14c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
/*
* Copyright (C) 2005 Atmel Corporation
*
* This file is subject to the terms and conditions of the GNU Lesser General
* Public License. See the file "COPYING.LIB" in the main directory of this
* archive for more details.
*/
#if !defined _BYTESWAP_H && !defined _NETINET_IN_H
# error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead."
#endif
#ifndef _BITS_BYTESWAP_H
#define _BITS_BYTESWAP_H 1
/* Swap bytes in 16 bit value. */
#if defined __GNUC__
# define __bswap_16(x) (__extension__ __builtin_bswap_16(x))
#else
/* This is better than nothing. */
static __inline unsigned short int
__bswap_16 (unsigned short int __bsx)
{
return ((((__bsx) >> 8) & 0xff) | (((__bsx) & 0xff) << 8));
}
#endif
/* Swap bytes in 32 bit value. */
#if defined __GNUC__
# define __bswap_32(x) (__extension__ __builtin_bswap_32(x))
#else
static __inline unsigned int
__bswap_32 (unsigned int __bsx)
{
return ((((__bsx) & 0xff000000) >> 24) | (((__bsx) & 0x00ff0000) >> 8) |
(((__bsx) & 0x0000ff00) << 8) | (((__bsx) & 0x000000ff) << 24));
}
#endif
#if defined __GNUC__
/* Swap bytes in 64 bit value. */
# define __bswap_constant_64(x) \
((((x) & 0xff00000000000000ull) >> 56) \
| (((x) & 0x00ff000000000000ull) >> 40) \
| (((x) & 0x0000ff0000000000ull) >> 24) \
| (((x) & 0x000000ff00000000ull) >> 8) \
| (((x) & 0x00000000ff000000ull) << 8) \
| (((x) & 0x0000000000ff0000ull) << 24) \
| (((x) & 0x000000000000ff00ull) << 40) \
| (((x) & 0x00000000000000ffull) << 56))
# define __bswap_64(x) \
(__extension__ \
({ \
union { \
__extension__ unsigned long long int __ll; \
unsigned int __l[2]; \
} __w, __r; \
if (__builtin_constant_p(x)) \
__r.__ll = __bswap_constant_64(x); \
else { \
__w.__ll = (x); \
__r.__l[0] = __bswap_32(__w.__l[1]); \
__r.__l[1] = __bswap_32(__w.__l[0]); \
} \
__r.__ll; \
}))
#endif
#endif /* _BITS_BYTESWAP_H */
|
