Defines macro names used in common in the standard include files.
The following macro names are all implementation-defined.
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Type (macro)
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ptrdiff_t
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Indicates the type of the result of subtraction between two pointers.
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size_t
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Indicates the type of the result of an operation using the sizeof operator.
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Constant (macro)
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NULL
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Indicates the value when a pointer is not pointing at anything.
This value is such that the result of a comparison with 0 using the equality operator (==) is true.
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Variable (macro)
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errno
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If an error occurs during library function processing, the error code defined in the respective library is set in errno.
By setting 0 in errno before calling a library function and checking the error code set in errno after the library function processing has ended, it is possible to check whether an error occurred during the library function processing.
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Function (macro)
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offsetof
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Obtains the offset in bytes from the beginning of a structure to a structure member.
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Type (macro)
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wchar_t
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Type that indicates an extended character.
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Implementation-Defined Specifications
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Value of macro NULL
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Value 0 (pointer to void)
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Type equivalent to macro ptrdiff_t
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long type
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Type equivalent to wchar_t
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short type
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