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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 are categorized as uppercase.

`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 an uppercase wide character.

Portability
`iswupper` is C99. `iswupper_l` is POSIX-1.2008.

No supporting OS subroutines are required.