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
|
/*
* Copyright (c) 2006 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef SWAP_H
#define SWAP_H
#include <xfs/xfs.h>
#include <swab.h>
#if __BYTE_ORDER == __BIG_ENDIAN
#define XFS_NATIVE_HOST 1
#else
#undef XFS_NATIVE_HOST
#endif
#define ARCH_NOCONVERT 1
#ifdef XFS_NATIVE_HOST
#define ARCH_CONVERT ARCH_NOCONVERT
#else
#define ARCH_CONVERT 0
#endif
#ifndef HAVE_SWABMACROS
#define INT_SWAP16(type, var) ((typeof(type))(__swab16((__u16)(var))))
#define INT_SWAP32(type, var) ((typeof(type))(__swab32((__u32)(var))))
#define INT_SWAP64(type, var) ((typeof(type))(__swab64((__u64)(var))))
#endif
#define INT_SWAP(type, var) \
((sizeof(type) == 8) ? INT_SWAP64(type, var) : \
((sizeof(type) == 4) ? INT_SWAP32(type, var) : \
((sizeof(type) == 2) ? INT_SWAP16(type, var) : \
(var))))
#define INT_GET(ref, arch) \
(((arch) == ARCH_NOCONVERT) ? (ref) : INT_SWAP((ref), (ref)))
#define INT_SET(ref, arch, valueref) \
(__builtin_constant_p(valueref) ? \
(void)((ref) = (((arch) != ARCH_NOCONVERT) ? \
(INT_SWAP((ref), (valueref))) : (valueref))) : \
(void)(((ref) = (valueref)), \
(((arch) != ARCH_NOCONVERT) ? \
(ref) = INT_SWAP((ref), (ref)) : 0)))
#define INT_XLATE(buf, p, dir, arch) \
((dir > 0) ? ((p) = INT_GET((buf),(arch))) : INT_SET((buf),(arch),(p)))
#endif /* SWAP_H */
|
