#include <stdint.h> /* uint8_t */
#include <stdio.h> /* printf, fflush, fgets, stdin, perror, fprintf */
#include <string.h> /* strlen */
#include <locale.h> /* setlocale */
#include <stdlib.h> /* free */
#include <idn2.h> /* idn2_lookup_ul, IDN2_OK, idn2_strerror, idn2_strerror_name */

int
main (int argc, char *argv[])
{
  int rc;
  char src[BUFSIZ];
  char *decoded;

  setlocale (LC_ALL, "");

  printf ("Enter (possibly non-ASCII) domain name to decode: ");
  fflush (stdout);
  if (!fgets (src, sizeof (src), stdin))
    {
      perror ("fgets");
      return 1;
    }
  src[strlen (src) - 1] = '\0';

  rc = idn2_to_unicode_lzlz (src, &decoded, 0);
  if (rc != IDN2_OK)
    {
      fprintf (stderr, "error: %s (%s, %d)\n",
	       idn2_strerror (rc), idn2_strerror_name (rc), rc);
      return 1;
    }

  printf ("Decoded domain name: %s\n", decoded);

  free (decoded);

  return 0;
}