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3.31 towupper, towupper_l—translate wide characters to uppercase

Synopsis 

     #include <wctype.h>
     wint_t towupper(wint_t c);
     
     #include <wctype.h>
     wint_t towupper_l(wint_t c, locale_t locale);

Description
towupper is a function which converts lowercase wide characters to uppercase, leaving all other characters unchanged.

towupper_l is like towupper but performs the function 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
towupper, towupper_l return the uppercase equivalent of c when it is a lowercase wide character, otherwise, it returns the input character.
Portability
towupper is C99. towupper_l is POSIX-1.2008.

No supporting OS subroutines are required.