Should prevent wrong uses, or at least decrease their chance.
* input, this could be *ptr++.
* @param ERROR Expression to be evaluated on invalid input,
* typically a goto statement.
+ *
+ * @warning ERROR should not contain a loop control statement which
+ * could interact with the internal while loop, and should force an
+ * exit from the macro code (e.g. through a goto or a return) in order
+ * to prevent undefined results.
*/
#define GET_UTF8(val, GET_BYTE, ERROR)\
val= GET_BYTE;\