towupper
Header: <wctype.h>
Converts the given wide character to uppercase, if possible.
# Declarations
wint_t towupper( wint_t wc );
(since C95)
# Parameters
wc: wide character to be converted
# Return value
Uppercase version of wc or unmodified wc if no uppercase version is listed in the current C locale.
# Notes
Only 1:1 character mapping can be performed by this function, e.g. the uppercase form of ‘ß’ is (with some exceptions) the two-character string “SS”, which cannot be obtained by towupper.
ISO 30112 specifies which pairs of Unicode characters are included in this mapping.
# Example
#include <stdio.h>
#include <wchar.h>
#include <wctype.h>
#include <locale.h>
int main(void)
{
wchar_t wc = L'\u017f'; // Latin small letter Long S ('ſ')
printf("in the default locale, towupper(%#x) = %#x\n", wc, towupper(wc));
setlocale(LC_ALL, "en_US.utf8");
printf("in Unicode locale, towupper(%#x) = %#x\n", wc, towupper(wc));
}