C_OPEN_1
n = ovbit + ((flags & C_OPEN_1) != 0 ? 1 : 0);
if ((flags & C_OPEN_1) != 0 &&
clearcombo(tcbp, cbp->c_flags & C_OPEN_1);
ncbp->c_flags |= C_OPEN_1;
ncbp->c_flags = ocb.cv_win != 0 ? C_OPEN_1 : 0;
int off = (flags & C_OPEN_1) != 0 ? 6 : 5;