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### 3.27 `iswxdigit`, `iswxdigit_l`—hexadecimal digit wide character test

Synopsis

    #include <wctype.h>
    int iswxdigit(wint_t c);

    #include <wctype.h>
    int iswxdigit_l(wint_t c, locale_t locale);

Description
`iswxdigit` is a function which classifies wide character values that are hexadecimal digits.

`iswxdigit_l` is like `iswxdigit` but performs the check based on the locale specified by the locale object locale. If locale is LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.

Returns
`iswxdigit`, `iswxdigit_l` return non-zero if c is a hexadecimal digit wide character.

Portability
`iswxdigit` is C99. `iswxdigit_l` is POSIX-1.2008.

No supporting OS subroutines are required.