scc

 1struct ptrs {
 2	unsigned char *rp;
 3	unsigned char *wp;
 4};
 5
 6struct ptrs iob[2]; 
 7 
 8int 
 9main() 
10{
11	static unsigned char buf[10];
12
13	iob[0].rp = buf;
14	iob[0].wp = buf+2;
15
16	return (&iob[0])->rp >= (&iob[0])->wp;
17}