On Sun, Apr 20, 2008 at 11:13:56AM +0200, Florian Weimer scratched on the wall: > * Dennis Cote: > > > This last function can be implemented using bit manipulation operators > > in SQL or in a custom function in C. > > > > containedIn(ip_addr, network_addr, network_size) > > > > can be replaced by > > > > nework_addr == (ip_addr & (-1 << network_size)) > > > > which will be true if the IP address is in the network. > > Is this Java or C? For C, this breaks if network_size == 32.
It breaks for everything except network_size == 16. You want something closer to (ip_addr & (~(~0 << network_size))) Again, that only works for v4. Part of the beauty of the INET and CIDR types in PostgreSQL is that they take both v4 and v6 addresses/networks and all the operations work on both address types automatically. -j -- Jay A. Kreibich < J A Y @ K R E I B I.C H > "'People who live in bamboo houses should not throw pandas.' Jesus said that." - "The Ninja", www.AskANinja.com, "Special Delivery 10: Pop!Tech 2006" _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
