20     int k, i=0, b;  in parse_ipnetwork()  local
23         b=0;  in parse_ipnetwork()
26             b=b*10+p[i++]-'0';  in parse_ipnetwork()
27             if (b>256) return 0;  in parse_ipnetwork()
31         ip = (ip<<8) | b;  in parse_ipnetwork()
37         i++; b=0;  in parse_ipnetwork()
39             b=b*10+p[i++]-'0';  in parse_ipnetwork()
40             if (b>32) return 0;  in parse_ipnetwork()
42         if (p[i]!=0||b>32||b<1) return 0;  in parse_ipnetwork()
43         b=32-b;  in parse_ipnetwork()
44         mk>>=b; mk<<=b;  in parse_ipnetwork()