init

pg_include/utils/inet.h

@@ -0,0 +1,85 @@
+/*-------------------------------------------------------------------------
+ *
+ * inet.h
+ *	  Declarations for operations on INET datatypes.
+ *
+ *
+ * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/utils/inet.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef INET_H
+#define INET_H
+
+#include "fmgr.h"
+
+/*
+ *	This is the internal storage format for IP addresses
+ *	(both INET and CIDR datatypes):
+ */
+typedef struct
+{
+	unsigned char family;		/* PGSQL_AF_INET or PGSQL_AF_INET6 */
+	unsigned char bits;			/* number of bits in netmask */
+	unsigned char ipaddr[16];	/* up to 128 bits of address */
+} inet_struct;
+
+/*
+ * Referencing all of the non-AF_INET types to AF_INET lets us work on
+ * machines which may not have the appropriate address family (like
+ * inet6 addresses when AF_INET6 isn't present) but doesn't cause a
+ * dump/reload requirement.  Existing databases used AF_INET for the family
+ * type on disk.
+ */
+#define PGSQL_AF_INET	(AF_INET + 0)
+#define PGSQL_AF_INET6	(AF_INET + 1)
+
+/*
+ * Both INET and CIDR addresses are represented within Postgres as varlena
+ * objects, ie, there is a varlena header in front of the struct type
+ * depicted above.	This struct depicts what we actually have in memory
+ * in "uncompressed" cases.  Note that since the maximum data size is only
+ * 18 bytes, INET/CIDR will invariably be stored into tuples using the
+ * 1-byte-header varlena format.  However, we have to be prepared to cope
+ * with the 4-byte-header format too, because various code may helpfully
+ * try to "decompress" 1-byte-header datums.
+ */
+typedef struct
+{
+	char		vl_len_[4];		/* Do not touch this field directly! */
+	inet_struct inet_data;
+} inet;
+
+
+/*
+ *	This is the internal storage format for MAC addresses:
+ */
+typedef struct macaddr
+{
+	unsigned char a;
+	unsigned char b;
+	unsigned char c;
+	unsigned char d;
+	unsigned char e;
+	unsigned char f;
+} macaddr;
+
+/*
+ * fmgr interface macros
+ */
+#define DatumGetInetP(X)	((inet *) PG_DETOAST_DATUM(X))
+#define DatumGetInetPP(X)	((inet *) PG_DETOAST_DATUM_PACKED(X))
+#define InetPGetDatum(X)	PointerGetDatum(X)
+#define PG_GETARG_INET_P(n) DatumGetInetP(PG_GETARG_DATUM(n))
+#define PG_GETARG_INET_PP(n) DatumGetInetPP(PG_GETARG_DATUM(n))
+#define PG_RETURN_INET_P(x) return InetPGetDatum(x)
+/* macaddr is a fixed-length pass-by-reference datatype */
+#define DatumGetMacaddrP(X)    ((macaddr *) DatumGetPointer(X))
+#define MacaddrPGetDatum(X)    PointerGetDatum(X)
+#define PG_GETARG_MACADDR_P(n) DatumGetMacaddrP(PG_GETARG_DATUM(n))
+#define PG_RETURN_MACADDR_P(x) return MacaddrPGetDatum(x)
+
+#endif   /* INET_H */