redhat man page for iswxdigit

ISWXDIGIT(3)						     Linux Programmer's Manual						      ISWXDIGIT(3)

NAME
       iswxdigit - test for hexadecimal digit wide character

SYNOPSIS
       #include <wctype.h>

       int iswxdigit(wint_t wc);

DESCRIPTION
       The  iswxdigit function is the wide-character equivalent of the isxdigit function. It tests whether wc is a wide character belonging to the
       wide character class "xdigit".

       The wide character class "xdigit" is a subclass of the wide character class "alnum", and therefore also a subclass of  the  wide  character
       class "graph" and of the wide character class "print".

       Being a subclass of the wide character class "print", the wide character class "xdigit" is disjoint from the wide character class "cntrl".

       Being  a  subclass of the wide character class "graph", the wide character class "xdigit" is disjoint from the wide character class "space"
       and its subclass "blank".

       Being a subclass of the wide character class "alnum", the wide character class "xdigit" is disjoint from the wide character class "punct".

       The wide character class "xdigit" always contains at least the letters 'A' to 'F', 'a' to 'f' and the digits '0' to '9'.

RETURN VALUE
       The iswxdigit function returns non-zero if wc is a wide character belonging to the wide character  class  "xdigit".  Otherwise  it  returns
       zero.

CONFORMING TO
       ISO/ANSI C, UNIX98

SEE ALSO
       isxdigit(3), iswctype(3)

NOTES
       The behaviour of iswxdigit depends on the LC_CTYPE category of the current locale.

GNU
								    1999-07-25							      ISWXDIGIT(3)