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34 .\" @(#)isxdigit.3 5.2 (Berkeley) 6/29/91
41 .Nd hexadecimal-digit character test
51 function tests for any hexadecimal-digit character.
55 function returns zero if the character tests false and
56 returns non-zero if the character tests true.
86 or representable as an
88 otherwise, the behavior is undefined.