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DESCRIPTION
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DESCRIPTION
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<> is a macro which classifies ASCII integer values by table
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<> is a macro which classifies ASCII integer values by table
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lookup.  It is a predicate returning non-zero for hexadecimal digits,
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lookup.  It is a predicate returning non-zero for hexadecimal digits,
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and <<0>> for other characters.  It is defined only when
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and <<0>> for other characters.  It is defined only if <[c]> is
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<>(<[c]>) is true or <[c]> is EOF.
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representable as an unsigned char or if <[c]> is EOF.
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You can use a compiled subroutine instead of the macro definition by
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You can use a compiled subroutine instead of the macro definition by
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undefining the macro using `<<#undef isxdigit>>'.
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undefining the macro using `<<#undef isxdigit>>'.