跌破开盘价止损问题？　[金字塔]

c1:=callstock(stklabel,vtclose,6,-1);

oo:=valuewhen(todaybar=1,open);

cc:=valuewhen(todaybar=1,close);

if oo-c1>=10 then buy(holding=0,1,marketr);

if cc-oo>=5 then buy(holding=1,1,marketr);

if enterbars>0 and holding>0 and l<=oo then sell(1,0,marketr);