diff options
Diffstat (limited to 'src/backend/utils/adt/network.c')
| -rw-r--r-- | src/backend/utils/adt/network.c | 42 |
1 files changed, 41 insertions, 1 deletions
diff --git a/src/backend/utils/adt/network.c b/src/backend/utils/adt/network.c index 5757a3c1fa9..92229d38186 100644 --- a/src/backend/utils/adt/network.c +++ b/src/backend/utils/adt/network.c @@ -3,7 +3,7 @@ * is for IP V4 CIDR notation, but prepared for V6: just * add the necessary bits where the comments indicate. * - * $Header: /cvsroot/pgsql/src/backend/utils/adt/network.c,v 1.38 2002/11/13 00:39:47 momjian Exp $ + * $Header: /cvsroot/pgsql/src/backend/utils/adt/network.c,v 1.39 2003/03/21 21:54:29 momjian Exp $ * * Jon Postel RIP 16 Oct 1998 */ @@ -605,6 +605,46 @@ network_netmask(PG_FUNCTION_ARGS) PG_RETURN_INET_P(dst); } +Datum +network_hostmask(PG_FUNCTION_ARGS) +{ + inet *ip = PG_GETARG_INET_P(0); + inet *dst; + + dst = (inet *) palloc(VARHDRSZ + sizeof(inet_struct)); + /* make sure any unused bits are zeroed */ + MemSet(dst, 0, VARHDRSZ + sizeof(inet_struct)); + + if (ip_family(ip) == AF_INET) + { + /* It's an IP V4 address: */ + unsigned long mask = 0xffffffff; + + /* + * Only shift if the mask len is < 32 bits .. + */ + + if (ip_bits(ip) < 32) + mask >>= ip_bits(ip); + else + mask = 0; + + ip_v4addr(dst) = htonl(mask); + + ip_bits(dst) = 32; + } + else + /* Go for an IPV6 address here, before faulting out: */ + elog(ERROR, "unknown address family (%d)", ip_family(ip)); + + ip_family(dst) = ip_family(ip); + ip_type(dst) = 0; + VARATT_SIZEP(dst) = VARHDRSZ + + ((char *) &ip_v4addr(dst) - (char *) VARDATA(dst)) + + ip_addrsize(dst); + + PG_RETURN_INET_P(dst); +} /* * Convert a value of a network datatype to an approximate scalar value. |