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41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
#pragma once
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#include <assert.h>
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#include <stddef.h>
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// Ensure structs are correct size & offsets
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#if defined(static_assert) || defined(__cplusplus)
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# define WUT_CHECK_SIZE(Type, Size) \
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static_assert(sizeof(Type) == Size, \
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#Type " must be " #Size " bytes")
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# define WUT_CHECK_OFFSET(Type, Offset, Field) \
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static_assert(offsetof(Type, Field) == Offset, \
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#Type "::" #Field " must be at offset " #Offset)
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#else
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# define WUT_CHECK_SIZE(Type, Size)
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# define WUT_CHECK_OFFSET(Type, Offset, Field)
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#endif
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// Workaround weird macro concat ## behaviour
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#define WUT_PP_CAT(a, b) WUT_PP_CAT_I(a, b)
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#define WUT_PP_CAT_I(a, b) WUT_PP_CAT_II(~, a ## b)
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#define WUT_PP_CAT_II(p, res) res
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// Allow us to easily add UNKNOWN / PADDING bytes into our structs,
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// generates unique variable names using __COUNTER__
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#define WUT_UNKNOWN_BYTES(Size) char WUT_PP_CAT(__unk, __COUNTER__) [Size]
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#define WUT_PADDING_BYTES(Size) WUT_UNKNOWN_BYTES(Size)
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// Unknown struct size
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#define WUT_UNKNOWN_SIZE(x)
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// Marks a struct as packed
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#define WUT_PACKED __attribute__((__packed__))
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// Sets alignment for a struct
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#if defined(__alignas_is_defined) || defined(__cplusplus)
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#define WUT_ALIGNAS(x) alignas(x)
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#elif defined(__GNUC__) || defined(__clang__)
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#define WUT_ALIGNAS(x) __attribute__((__aligned__(x)))
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#endif
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