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I have a simple question about unicode and utf8.

How does a utf8 encoding know what its uppercase encoding is? I understand how utf8 encoding carries its unicode value embedded in itself but I fail to see how it maps a utf8 encoding to an uppercase unicode value. What is the mechanism which maps utf8 encodings to uppercase encodings or the other features available in the unicode universe?

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Do you mean something like this?

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char**argv)
{
    /*make sure str1 is padded with enough room*/
    char str1[] = {'H','e','l','l','o',',',' ','W','o','r','l','d','\0',' ',' ', ' ', ' ', ' ', ' '};
    char str2[] = "this is more text";

    fprintf(stdout, "str1->%s\n", str1);
    fprintf(stdout, "str2->%s\n", str2);

    /*append text*/

    strcat(str1, &str2[12]);

    fprintf(stdout, "str1->%s\n", str1);

    exit(EXIT_SUCCESS);
}