* The SuSv2 description leaves some room for interpretation. We'll assume wch
* points to a string which is L'\0' terminated, contains at least one
* character with strictly positive width, which must be the first, and
* The SuSv2 description leaves some room for interpretation. We'll assume wch
* points to a string which is L'\0' terminated, contains at least one
* character with strictly positive width, which must be the first, and