ng);
  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);

  /* line number */

  jsstring_property_name = JSStringCreateWithUTF8CString(&quot;line&quot;);
  value_ref = JSObjectGetProperty(js_context, exception_object, jsstring_property_name, &amp;temporary_exception);
  JSStringRelease(jsstring_property_name);
  js_return_string = JSValueToStringCopy(js_context, value_re