DCS
c = DCS;
case DCS:
ip->escape = DCS;
c = DCS;
case DCS: /* device control string introducer */
sc->escape = DCS;
if ((c >= 0x20 && ip->escape != 0) || ip->escape == DCS) {
c = DCS;
case DCS:
case DCS: /* device control string introducer */
ip->escape = DCS;
if (ip->escape == DCS) {
case DCS: /* 8-bit */