43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
// SPDX-License-Identifier: ISC
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#pragma once
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#define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
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#define ROUND_UP(value, to) (((value) + ((to) - 1)) / (to))
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#define ALIGN_DOWN(value, align) (((value) / (align)) * (align))
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#define ALIGN_UP(value, align) (ROUND_UP(value, align) * align)
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#define MIN(a, b) ((a) < (b) ? (a) : (b))
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#define MAX(a, b) ((a) > (b) ? (a) : (b))
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#define BIT_TEST(value, bit) (((value) & (1 << bit)) == (1 << bit))
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#if defined(__has_builtin)
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#if __has_builtin(__builtin_types_compatible_p)
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// Get pointer to parent object given pointer to a struct or union member.
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#define containerof(ptr, type, member) \
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({ \
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static_assert( \
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__builtin_types_compatible_p(typeof(*(ptr)), typeof(((type*)0)->member)), \
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"Incompatible types for containerof" \
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); \
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(type*)((size_t)(ptr) - offsetof(type, member)); \
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})
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#endif
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#endif
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#ifndef containerof
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// Get pointer to parent object given pointer to a struct or union member.
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#define containerof(ptr, type, member) (type*)((size_t)(ptr) - offsetof(type, member))
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#endif
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#define CONCAT(A, B) _CONCAT(A, B)
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#define _CONCAT(A, B) A##B
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// Creates a unique identifier for a compilation unit.
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#define UNIQUE_IDENT(ident) CONCAT(__unique_##ident, __COUNTER__)
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// Ensures that a type is properly defined at this point.
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// This is used to ensure that e.g. architecture-specific structures are defined.
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#define ASSERT_TYPE(type) static_assert(sizeof(type) == sizeof(type))
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