Interfacing function
eng

##
BITCLEAR

### File content

    function [x,y,typ]=BITCLEAR(job,arg1,arg2)
    x=[];y=[];typ=[]
    select job
     case 'plot' then
      OPER=string( arg1.graphics.exprs(2))
      standard_draw(arg1)
    case 'getinputs' then
      [x,y,typ]=standard_inputs(arg1)
    case 'getoutputs' then
      [x,y,typ]=standard_outputs(arg1)
    case 'getorigin' then
      [x,y]=standard_origin(arg1)
    case 'set' then
      x=arg1;
      graphics=arg1.graphics;exprs=graphics.exprs
      model=arg1.model;
      while %t do
        [ok,Datatype,bit,exprs]=getvalue('Set parameters',..
    	['Datatype(3=int32 4=int16 5=int8 ...)';..
    	 'index of bit (0 is leat significant)'],..
    	list('vec',1,'vec',1),exprs)
        if ~ok then break,end
        in=[model.in model.in2];
        if (bit<0) then
          message('Incorrect index '+string(bit)+' ; must be >0.');ok=%f;
        end
        if floor(bit)<> bit then message("index of bit must be integer");ok=%f;end
        if (Datatype==3)|(Datatype==6) then
    	if bit > 31 then message ('Incorrect index '+string(bit)+' ; must be <32.');ok=%f;
    	else
    	 bit=uint32(bit)
    	 n=(2^32-1)-2^bit;
    	 n=uint32(n)
    	 model.sim=list('bit_clear_32',4)
    	end
        elseif (Datatype==4)|(Datatype==7) then
    	if bit > 15 then message ('Incorrect index '+string(bit)+' ; must be <16.');ok=%f;
    	else
    	 bit=uint16(bit)
    	 n=(2^16-1)-2^bit;
    	 n=uint16(n)
    	 model.sim=list('bit_clear_16',4)
    	end
        elseif (Datatype==5)|(Datatype==8) then
    	if bit > 7 then message ('Incorrect index '+string(bit)+' ; must be <8.');ok=%f;
    	else
    	 bit=uint8(bit)
    	 n=(2^8-1)-2^bit;
    	 n=uint8(n)
    	 model.sim=list('bit_clear_8',4)
    	end
        else message ('Datatype '+string(Datatype)+' is not supported ; It must be 3 to 8');ok=%f;
        end
          if ok then
    	it=Datatype
    	ot=Datatype
    	out=[1 1]
    	[model,graphics,ok]=set_io(model,graphics,list(in,it),list(out,ot),[],[])
          end
          if ok then
    	graphics.exprs=exprs;
    	model.opar=list(n)
    	x.graphics=graphics;x.model=model;
    	break
          end
      end

    case 'define' then
      model=scicos_model()
      model.sim=list('bit_clear_32',4)
      model.in=1
      model.in2=1
      model.out=1
      model.out2=1;
      model.intyp=3
      model.outtyp=3
      model.opar=list(int32(0))
      model.blocktype='c'
      model.dep_ut=[%t %f]

      exprs=[sci2exp(3);sci2exp(0)]
      gr_i=['xstringb(orig(1),orig(2),[''Clear'';''bit: ''+OPER],sz(1),sz(2),''fill'');']
      x=standard_define([2 2],model,exprs,gr_i)

    end
    endfunction