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3.26 iswupper, iswupper_l—uppercase wide character test

Synopsis 

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

Description
iswupper is a function which classifies wide-character values that have uppercase translations.

iswupper_l is like iswupper 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
iswupper, iswupper_l return non-zero if c is a uppercase wide character.
Portability
iswupper is C99. iswupper_l is POSIX-1.2008.

No supporting OS subroutines are required.