1 files changed, 75 insertions, 0 deletions
diff --git a/src/include/storage/itemid.h b/src/include/storage/itemid.h
new file mode 100644
index 00000000000..7e4fc5e28d6
--- /dev/null
+++ b/src/include/storage/itemid.h
@@ -0,0 +1,75 @@
+/*-------------------------------------------------------------------------
+ *
+ * itemid.h--
+ *    Standard POSTGRES buffer page item identifier definitions.
+ *
+ *
+ * Copyright (c) 1994, Regents of the University of California
+ *
+ * $Id: itemid.h,v 1.1 1996/08/28 01:58:08 scrappy Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef	ITEMID_H
+#define ITEMID_H
+
+typedef uint16	ItemOffset;
+typedef uint16	ItemLength;
+
+typedef bits16	ItemIdFlags;
+
+
+
+typedef struct ItemIdData {		/* line pointers */
+	unsigned	lp_off:13,	/* offset to find tup */
+					/* can be reduced by 2 if necc. */
+			lp_flags:6,	/* flags on tuple */
+			lp_len:13;	/* length of tuple */
+} ItemIdData;
+
+typedef struct ItemIdData	*ItemId;
+
+#ifndef	LP_USED
+#define LP_USED		0x01	/* this line pointer is being used */
+#endif
+
+/* ----------------
+ *	support macros
+ * ----------------
+ */
+/* 
+ *	ItemIdGetLength
+ */
+#define ItemIdGetLength(itemId) \
+   ((itemId)->lp_len)
+
+/* 
+ *	ItemIdGetOffset
+ */
+#define ItemIdGetOffset(itemId) \
+   ((itemId)->lp_off)
+
+/* 
+ *	ItemIdGetFlags
+ */
+#define ItemIdGetFlags(itemId) \
+   ((itemId)->lp_flags)
+
+/*
+ * ItemIdIsValid --
+ *	True iff disk item identifier is valid.
+ */
+#define	ItemIdIsValid(itemId)	PointerIsValid(itemId)
+
+/*
+ * ItemIdIsUsed --
+ *	True iff disk item identifier is in use.
+ *
+ * Note:
+ *	Assumes disk item identifier is valid.
+ */
+#define ItemIdIsUsed(itemId) \
+    (AssertMacro(ItemIdIsValid(itemId)) ? \
+     (bool) (((itemId)->lp_flags & LP_USED) != 0) : false)
+
+#endif	/* ITEMID_H */