Moved from backend/access to include/access

src/include/access/htup.h

@@ -0,0 +1,115 @@
+/*-------------------------------------------------------------------------
+ *
+ * htup.h--
+ *    POSTGRES heap tuple definitions.
+ *
+ *
+ * Copyright (c) 1994, Regents of the University of California
+ *
+ * $Id: htup.h,v 1.1 1996/08/27 21:50:14 scrappy Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef	HTUP_H
+#define HTUP_H
+
+#include "access/attnum.h"
+#include "storage/bufpage.h"  		/* just to reduce levels of #include */
+#include "storage/itemptr.h"
+#include "utils/nabstime.h"
+
+#define MinHeapTupleBitmapSize	32		/* 8 * 4 */
+
+/* check these, they are likely to be more severely limited by t_hoff */
+
+#define MaxHeapAttributeNumber	1600		/* 8 * 200 */
+
+/*
+ * to avoid wasting space, the attributes should be layed out in such a
+ * way to reduce structure padding.
+ */
+typedef struct HeapTupleData {
+
+    unsigned int	t_len;		/* length of entire tuple */
+
+    ItemPointerData	t_ctid;		/* current TID of this tuple */
+
+    ItemPointerData	t_chain;	/* replaced tuple TID */
+
+    Oid			t_oid;		/* OID of this tuple -- 4 bytes */
+
+    CommandId		t_cmin;		/* insert CID stamp -- 2 bytes each */
+    CommandId		t_cmax;		/* delete CommandId stamp */
+
+    TransactionId	t_xmin;		/* insert XID stamp -- 4 bytes each */
+    TransactionId	t_xmax;		/* delete XID stamp */
+
+    AbsoluteTime	t_tmin;		/* time stamps -- 4 bytes each */
+    AbsoluteTime	t_tmax;	
+
+    int16		t_natts;	/* number of attributes */
+    char		t_vtype;	/* not used - padding */
+
+    char		t_infomask;	/* whether tuple as null or variable
+					 * length attributes
+					 */
+
+    uint8		t_hoff;		/* sizeof tuple header */
+
+    bits8		t_bits[MinHeapTupleBitmapSize / 8];
+					/* bit map of domains */
+
+    /* MORE DATA FOLLOWS AT END OF STRUCT */
+} HeapTupleData;	
+
+typedef HeapTupleData	*HeapTuple;
+
+
+#define SelfItemPointerAttributeNumber		(-1)
+#define ObjectIdAttributeNumber			(-2)
+#define MinTransactionIdAttributeNumber		(-3)
+#define MinCommandIdAttributeNumber		(-4)
+#define MaxTransactionIdAttributeNumber		(-5)
+#define MaxCommandIdAttributeNumber		(-6)
+#define ChainItemPointerAttributeNumber		(-7)
+#define AnchorItemPointerAttributeNumber	(-8)
+#define MinAbsoluteTimeAttributeNumber		(-9)
+#define MaxAbsoluteTimeAttributeNumber		(-10)
+#define VersionTypeAttributeNumber		(-11)
+#define FirstLowInvalidHeapAttributeNumber	(-12)
+
+
+/* ----------------
+ *	support macros
+ * ----------------
+ */
+#define GETSTRUCT(TUP) (((char *)(TUP)) + ((HeapTuple)(TUP))->t_hoff)
+
+
+/*
+ * BITMAPLEN(NATTS) - 
+ *	Computes minimum size of bitmap given number of domains.
+ */
+#define BITMAPLEN(NATTS) \
+	((((((int)(NATTS) - 1) >> 3) + 4 - (MinHeapTupleBitmapSize >> 3)) \
+	  & ~03) + (MinHeapTupleBitmapSize >> 3))
+
+/*
+ * HeapTupleIsValid
+ *	True iff the heap tuple is valid.
+ */
+#define	HeapTupleIsValid(tuple)	PointerIsValid(tuple)
+
+/*
+ * information stored in t_infomask:
+ */
+#define HEAP_HASNULL		0x01	/* has null attribute(s) */
+#define	HEAP_HASVARLENA		0x02	/* has variable length attribute(s) */
+
+#define HeapTupleNoNulls(tuple) \
+	(!(((HeapTuple) (tuple))->t_infomask & HEAP_HASNULL))
+
+#define HeapTupleAllFixed(tuple) \
+	(!(((HeapTuple) (tuple))->t_infomask & HEAP_HASVARLENA))
+
+#endif	/* HTUP_H */