1/*
2 * kmod - interface to kernel module operations
3 *
4 * Copyright (C) 2011-2013  ProFUSION embedded systems
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
18 */
19#pragma once
20
21#include <stddef.h>
22
23#if defined(HAVE_STATIC_ASSERT)
24#define assert_cc(expr) \
25	_Static_assert((expr), #expr)
26#else
27#define assert_cc(expr) \
28       do { (void) sizeof(char [1 - 2*!(expr)]); } while(0)
29#endif
30
31#define check_types_match(expr1, expr2)		\
32	((typeof(expr1) *)0 != (typeof(expr2) *)0)
33
34#define container_of(member_ptr, containing_type, member)		\
35	((containing_type *)						\
36	 ((char *)(member_ptr) - offsetof(containing_type, member))	\
37	 - check_types_match(*(member_ptr), ((containing_type *)0)->member))
38
39
40/* Two gcc extensions.
41 * &a[0] degrades to a pointer: a different type from an array */
42#define _array_size_chk(arr) ({ \
43	assert_cc(!__builtin_types_compatible_p(typeof(arr), typeof(&(arr)[0]))); \
44	0; \
45	})
46
47#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + _array_size_chk(arr))
48#define XSTRINGIFY(x) #x
49#define STRINGIFY(x) XSTRINGIFY(x)
50
51/* Temporaries for importing index handling */
52#define NOFAIL(x) (x)
53#define fatal(x...) do { } while (0)
54
55/* Attributes */
56
57#define _must_check_ __attribute__((warn_unused_result))
58#define _printf_format_(a,b) __attribute__((format (printf, a, b)))
59#define _unused_ __attribute__((unused))
60#define _always_inline_ __inline__ __attribute__((always_inline))
61#define _cleanup_(x) __attribute__((cleanup(x)))
62
63/* Define C11 noreturn without <stdnoreturn.h> and even on older gcc
64 * compiler versions */
65#ifndef noreturn
66#if defined(HAVE_NORETURN)
67#define noreturn _Noreturn
68#else
69#define noreturn __attribute__((noreturn))
70#endif
71#endif
72
73#define UNIQ __COUNTER__
74