ST_BLANK_READ
if (st->flags & ST_BLANK_READ) {
st->flags &= ~ST_BLANK_READ;
if ((st->flags & ST_BLANK_READ) && (number < 0)) {
st->flags &= ~ST_BLANK_READ;
} else if (!(st->flags & (ST_2FM_AT_EOD | ST_BLANK_READ))) {
st->flags |= ST_BLANK_READ;
ST_BLANK_READ)