libc.info: towupper

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`towupper'--translate wide-characters to upper case

*Synopsis*
     #include <wctype.h>
     wint_t towupper(wint_t C);
   *Description*
`towupper' is a function which converts lower-case wide-characters to
upper case, leaving all other characters unchanged.
*Returns*
`towupper' returns the upper-case equivalent of C when it is a
lower-case wide-character, otherwise, it returns the input character.
*Portability*
`towupper' is C99.
   No supporting OS subroutines are required.