Code fragment: # of bars since the turning point of a buffer

I need a fragment of mql4 code that I can insert into a loop:

int start()



  {



   int limit;



   int counted_bars=IndicatorCounted();



   if(counted_bars<0) return(-1);



   if(counted_bars>0) counted_bars--;



   limit=Bars-counted_bars;







   for(int i=0; i<limit; i++)



   {  



   ExtMapBuffer0[i]=something;



   }







   for(i=0; i<limit; i++)



   {    



   TurningPointBuffer[i]=...;



   }



   return(0);



  }



//+------------------------------------------------------------------+

Where the TurningPointBuffer[i] contains the number of bars since ExtMapBuffer0[i] changed direction (changed sign of slope).

Doesn't seem too difficult? Then bid and let's quickly finish this!