Computational routine
eng

##
gainblk_i8s

### File content

    #include <math.h>
    #include "../machine.h"
    #include "scicos_block4.h"

    void gainblk_i8s(scicos_block *block,int flag)
    {
     if ((flag==1)|(flag==6)){
      int i,j,l,ji,jl,il;
      char *u,*y;
      int mu,ny,my,mo,no;
      char *opar;
      double k,D,C;

      mo=GetOparSize(block,1,1);
      no=GetOparSize(block,1,2);
      mu=GetInPortRows(block,1);
      my=GetOutPortRows(block,1);
      ny=GetOutPortCols(block,1);
      u=Getint8InPortPtrs(block,1);
      y=Getint8OutPortPtrs(block,1);
      opar=Getint8OparPtrs(block,1);

      k=pow(2,8)/2;
      if (mo*no==1){
        for (i=0;i<ny*mu;++i){
         D=(double)(opar[0])*(double)(u[i]);
         if (D>=k)  D=k-1;
         else if (D<-k) D=-k;
         y[i]=(char)D;
        }
      }else{
         for (l=0;l<ny;l++)
    	 {for (j=0;j<my;j++)
    	      {D=0;
    	       for (i=0;i<mu;i++)
    		   {ji=j+i*my;
    		    jl=j+l*my;
    		    il=i+l*mu;
    		    C=(double)(opar[ji])*(double)(u[il]);
    		    D=D + C;}
    		    if (D>=k)  D=k-1;
    		    else if (D<-k) D=-k;
    		    y[jl]=(char)D;
    		  }
    	     }
      }
     }
    }