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/* ----------
* numeric.h
*
* Definitions for the exact numeric data type of Postgres
*
* 1998 Jan Wieck
*
* $Header: /cvsroot/pgsql/src/include/utils/numeric.h,v 1.4 1999/02/13 23:22:26 momjian 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 1000
#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 * 2)
#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_ */
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