libc.info: iswxdigit

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`iswxdigit'--hexadecimal digit wide-character test

*Synopsis*
     #include <wctype.h>
     int iswxdigit(wint_t C);
   *Description*
`iswxdigit' is a function which classifies wide-character values that
are hexadecimal digits.
*Returns*
`iswxdigit' returns non-zero if C is a hexadecimal digit wide-character.
*Portability*
`iswxdigit' is C99.
   No supporting OS subroutines are required.