On Sat, Jan 29, 2005 at 02:35:06PM -0700, Michael Fuhr wrote:
> CREATE FUNCTION bigint2inet(bigint) RETURNS inet AS '
> BEGIN
> RETURN cidr(''0x'' || lpad(to_hex($1), 8, ''0''));
> END;
> ' LANGUAGE plpgsql IMMUTABLE STRICT;
I should point out that the above function is intended only as a
trivial example. It's designed for IPv4 address and will have
problems when the bigint value exceeds 2^32 - 1 (4294967295):
SELECT bigint2inet((2^32 - 1)::bigint);
bigint2inet
-----------------
255.255.255.255
(1 row)
SELECT bigint2inet((2^32)::bigint);
bigint2inet
-------------
16.0.0.0
(1 row)
A more robust implementation is left as an exercise for the reader.
--
Michael Fuhr
http://www.fuhr.org/~mfuhr/