I want to convert a Spanish string to uppercase. I use the function toupper for all characters. The function does not convert characters with accent:
PROTECCIóN
Nor the enye character:
DAñO
I use the setlocale function.
setlocale(LC_ALL, "es_ES");
It is possible to get the good result with setlocale(LC_ALL, "es_ES.utf8");, and use of wchar_t and of towupper(.) function.
Output
protección daño PROTECCIÓN DAÑO
#include <stdio.h>
#include <stdlib.h>
#include <wctype.h>
#include <wchar.h>
#include <locale.h>
int main(void) {
if (!setlocale(LC_ALL, "es_ES.utf8")) return 1;
wchar_t input[] = L"protección daño";
int length = sizeof(input)/sizeof(input[0]);
wchar_t output[length];
for (int i = 0; i < length-1; ++i) {
output[i] = towupper(input[i]);
}
output[length-1] = '\0';
printf ("%ls %ls\n", input, output);
return 0;
}