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
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
/*
* libkmod - interface to kernel module operations
*
* Copyright (C) 2011-2012 ProFUSION embedded systems
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _LIBKMOD_MACRO_H_
#define _LIBKMOD_MACRO_H_
#include <stddef.h>
#define BUILD_ASSERT(cond) \
do { (void) sizeof(char [1 - 2*!(cond)]); } while(0)
#define EXPR_BUILD_ASSERT(cond) \
(sizeof(char [1 - 2*!(cond)]) - 1)
#if HAVE_TYPEOF
#define check_type(expr, type) \
((typeof(expr) *)0 != (type *)0)
#define check_types_match(expr1, expr2) \
((typeof(expr1) *)0 != (typeof(expr2) *)0)
#else
/* Without typeof, we can only test the sizes. */
#define check_type(expr, type) \
EXPR_BUILD_ASSERT(sizeof(expr) == sizeof(type))
#define check_types_match(expr1, expr2) \
EXPR_BUILD_ASSERT(sizeof(expr1) == sizeof(expr2))
#endif /* HAVE_TYPEOF */
#define container_of(member_ptr, containing_type, member) \
((containing_type *) \
((char *)(member_ptr) - offsetof(containing_type, member)) \
- check_types_match(*(member_ptr), ((containing_type *)0)->member))
/*
* BUILD_ASSERT_OR_ZERO - assert a build-time dependency, as an expression.
* @cond: the compile-time condition which must be true.
*
* Your compile will fail if the condition isn't true, or can't be evaluated
* by the compiler. This can be used in an expression: its value is "0".
*
* Example:
* #define foo_to_char(foo) \
* ((char *)(foo) \
* + BUILD_ASSERT_OR_ZERO(offsetof(struct foo, string) == 0))
*/
#define BUILD_ASSERT_OR_ZERO(cond) \
(sizeof(char [1 - 2*!(cond)]) - 1)
/* Two gcc extensions.
* &a[0] degrades to a pointer: a different type from an array */
#define _array_size_chk(arr) \
BUILD_ASSERT_OR_ZERO(!__builtin_types_compatible_p(typeof(arr), \
typeof(&(arr)[0])))
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + _array_size_chk(arr))
/* Temporaries for importing index handling */
#define NOFAIL(x) (x)
#define fatal(x...) do { } while (0)
/* Attributes */
#define __must_check __attribute__((warn_unused_result))
#define __printf_format(a,b) __attribute__((format (printf, a, b)))
#if !defined(__always_inline)
#define __always_inline __inline__ __attribute__((always_inline))
#endif
#endif
|
