// show effects of lost bytes on ps/2 mouse protocol 
#include <stdio.h>
#include <errno.h>
int main(void)
{ 
	FILE *f;
	int i=0,x,a,y, xo,yo,xs,ys,r,m,l,t,dx,dy;

	f=fopen("/dev/psaux","r");
	if(f==NULL) strerror(errno);

 //printf("Simulating 2 lost bytes\n");
 //a=fgetc(f); a=fgetc(f);

 printf("Simulating 1 lost byte\n");
 a=fgetc(f);
	while (1) {
		a=fgetc(f);
		x=fgetc(f);
		y=fgetc(f);
		i++;
		printf("%5d -- %02x %02x %02x",i,a,x,y);

		yo=a&0x80;
		xo=a&0x40;
		ys=a&0x20;
		xs=a&0x10;
		t=a&0x08;
		m=a&0x04;
		r=a&0x02;
		l=a&0x01;

		dx=x;
		dy=y;
		if(xs) dx=x-256;
		if(ys) dy=y-256;
		printf(" ---   %4d : %4d   Buttons=%s%s%s Overflow/errors:%s%s%s\n",
			dx,dy,m?"M":" ", r?"R":" ", l?"L":" ",
			xo?"X":" ", yo?"Y":" ", t?" ":"T");
	}
	return 0;
}