f, NULL);
  bytes_needed = JSStringGetMaximumUTF8CStringSize(js_return_string);
  c_result_string = (char*)calloc(bytes_needed, sizeof(char));
  JSStringGetUTF8CString(js_return_string, c_result_string, bytes_needed);
  JSStringRelease(js_return_string);
  strncat(return_error_string, c_result_string, return_error_string_max_length-1);
  free(c_result_string);

  strncat(return_error_string, &quot;]&quot;, return_error_string_max_length-1);

  /* error message */

  jsstring_property_name = JSStringCreateWi