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