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/**
 * Returns a hint for a given error code.
 *
 * @param ec the error code.
 * @return the hint if it could be found, otherwise NULL.
 */
const char *
TALER_ErrorCode_get_hint (enum TALER_ErrorCode ec)
{
  unsigned int lower = 0;
  unsigned int upper = code_hint_pairs_length - 1;
  unsigned int mid = upper / 2;
  while (lower <= upper)
  {
    mid = (upper + lower) / 2;
    if (code_hint_pairs[mid].ec < ec)
    {
      lower = mid + 1;
    }
    else if (code_hint_pairs[mid].ec > ec)
    {
      upper = mid - 1;
    }
    else
    {
      return code_hint_pairs[mid].hint;
    }
  }
  return NULL;
}