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#include <langinfo.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
int main()
setlocale(LC_ALL, "C");
printf("LC_ALL: %s\n", setlocale(LC_ALL, NULL));
printf("LC_CTYPE: %s\n", setlocale(LC_CTYPE, NULL));
printf("nl_langinfo(CODESET): %s\n", nl_langinfo(CODESET));
for (unsigned i=0; i<=255; i++) {
char bytes[2];
wchar_t text[10];
bytes[0] = (char)i;
bytes[1]= '\0';
size_t res = mbstowcs(text, bytes, 1);
if (res != (size_t)-1) {
printf("byte 0x%02X decoded to Unicode character U+%04X\n", (unsigned char)i, text[0]);
else {
printf("byte 0x%02X cannot be decoded\n", (unsigned char)i);
return 0;
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