#include <u.h>#include <libc.h>#include <draw.h> /* * check for zero, negative size or insanely huge rectangle. */intbadrect(Rectangle r){	int x, y;	uint z; 	x = Dx(r);	y = Dy(r);	if(x > 0 && y > 0){		z = x*y;		if(z/x == y && z < 0x10000000)			return 0;	}	return 1;}