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3.20 iswdigit, iswdigit_l—decimal digit wide character test

Synopsis 

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

Description
iswdigit is a function which classifies wide-character values that are decimal digits.

iswdigit_l is like iswdigit 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
iswdigit, iswdigit_l return non-zero if c is a decimal digit wide character.
Portability
iswdigit is C99. iswdigit_l is POSIX-1.2008.

No supporting OS subroutines are required.