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

int main()
{
    // input, output and result of the operation
    char *output;
    int  result;

    // try to convert the invalid domain name
    result = idna_to_unicode_8z8z(".org", &output, IDNA_USE_STD3_ASCII_RULES);

    // the .org domain is obviously bogus, so we expect an error
    if (result != IDNA_SUCCESS) return 0;

    // idna considered the bogus name valid, this is an error
    fprintf(stderr, "libidn considered our bogus domain name valid, and converted it to: '%s'\n", output);
    free(output);

    // something went wrong
    return 1;
}