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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 1.13 2001/10/25 05:50:10 momjian Exp $
*
* ----------
*/
#ifndef _PG_NUMERIC_H_
#define _PG_NUMERIC_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
/* ----------
* Internal limits on the scales chosen for calculation results
* ----------
*/
#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)
/* ----------
* Sign values and macros to deal with packing/unpacking n_sign_dscale
* ----------
*/
#define NUMERIC_SIGN_MASK 0xC000
#define NUMERIC_POS 0x0000
#define NUMERIC_NEG 0x4000
#define NUMERIC_NAN 0xC000
#define NUMERIC_DSCALE_MASK 0x3FFF
#define NUMERIC_SIGN(n) ((n)->n_sign_dscale & NUMERIC_SIGN_MASK)
#define NUMERIC_DSCALE(n) ((n)->n_sign_dscale & NUMERIC_DSCALE_MASK)
#define NUMERIC_IS_NAN(n) (NUMERIC_SIGN(n) != NUMERIC_POS && \
NUMERIC_SIGN(n) != NUMERIC_NEG)
/* ----------
* The Numeric data type stored in the database
*
* NOTE: by convention, values in the packed form have been stripped of
* all leading and trailing zeroes (except there will be a trailing zero
* in the last byte, if the number of digits is odd). In particular,
* if the value is zero, there will be no digits at all! The weight is
* arbitrary in that case, but we normally set it to zero.
* ----------
*/
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 (2 decimal digits/byte) */
} NumericData;
typedef NumericData *Numeric;
#define NUMERIC_HDRSZ (sizeof(int32) + sizeof(uint16) * 3)
/*
* fmgr interface macros
*/
#define DatumGetNumeric(X) ((Numeric) PG_DETOAST_DATUM(X))
#define DatumGetNumericCopy(X) ((Numeric) PG_DETOAST_DATUM_COPY(X))
#define NumericGetDatum(X) PointerGetDatum(X)
#define PG_GETARG_NUMERIC(n) DatumGetNumeric(PG_GETARG_DATUM(n))
#define PG_GETARG_NUMERIC_COPY(n) DatumGetNumericCopy(PG_GETARG_DATUM(n))
#define PG_RETURN_NUMERIC(x) return NumericGetDatum(x)
#endif /* _PG_NUMERIC_H_ */
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