1 files changed, 67 insertions, 0 deletions
diff --git a/src/include/utils/numeric.h b/src/include/utils/numeric.h
new file mode 100644
index 00000000000..a22c77746d3
--- /dev/null
+++ b/src/include/utils/numeric.h
@@ -0,0 +1,67 @@
+/* ----------
+ * numeric.h -
+ *
+ *	Definitions for the exact numeric data type of Postgres
+ *
+ *	1998 Jan Wieck
+ *
+ * $Header: /cvsroot/pgsql/src/include/utils/numeric.h,v 1.1 1998/12/30 19:56:35 wieck Exp $
+ *
+ * ----------
+ */
+
+#ifndef _PG_NUMERIC_H_
+#define _PG_NUMERIC_H_
+
+#include "postgres.h"
+
+
+/* ----------
+ * The hardcoded limits and defaults of the numeric data type
+ * ----------
+ */
+#define NUMERIC_MAX_PRECISION		4000
+#define NUMERIC_DEFAULT_PRECISION	30
+#define NUMERIC_DEFAULT_SCALE		6
+
+#define	NUMERIC_MAX_DISPLAY_SCALE	NUMERIC_MAX_PRECISION
+#define	NUMERIC_MIN_DISPLAY_SCALE	NUMERIC_DEFAULT_SCALE + 4
+
+#define	NUMERIC_MAX_RESULT_SCALE	(NUMERIC_MAX_PRECISION + 4)
+#define NUMERIC_MIN_RESULT_SCALE	(NUMERIC_DEFAULT_PRECISION + 4)
+
+#define NUMERIC_UNPACKED_DATASIZE	(NUMERIC_MAX_PRECISION * 2 + 4)
+
+
+/* ----------
+ * Sign values and macros to deal with n_sign_dscale
+ * ----------
+ */
+#define NUMERIC_SIGN_MASK	0xC000
+#define	NUMERIC_POS			0x0000
+#define NUMERIC_NEG			0x4000
+#define NUMERIC_NAN			0xC000
+#define NUMERIC_SIGN(n)		((n)->n_sign_dscale & NUMERIC_SIGN_MASK)
+#define NUMERIC_DSCALE(n)	((n)->n_sign_dscale & ~NUMERIC_SIGN_MASK)
+#define NUMERIC_IS_NAN(n)	(NUMERIC_SIGN(n) != NUMERIC_POS && 			\
+								NUMERIC_SIGN(n) != NUMERIC_NEG)
+
+
+/* ----------
+ * The Numeric data type stored in the database
+ * ----------
+ */
+typedef struct NumericData {
+	int32			varlen;			/* Variable size		*/
+	int16			n_weight;		/* Weight of 1st digit	*/
+	uint16			n_rscale;		/* Result scale			*/
+	uint16			n_sign_dscale;	/* Sign + display scale	*/
+	unsigned char	n_data[1];		/* Digit data			*/
+} NumericData;
+typedef NumericData *Numeric;
+
+#define NUMERIC_HDRSZ	(sizeof(int32) + sizeof(uint16) * 3)
+
+
+#endif /* _PG_NUMERIC_H_ */
+