OSC
#define count(n,d,p) ((OSC * n)/(d * (1+p)))
c = OSC;
case OSC:
ip->escape = OSC;
c = OSC;
case OSC: /* introduces OS command. Ignore everything upto ST */
sc->escape = OSC;
c = OSC;
case OSC: /* introduces OS command. */
ip->escape = OSC;