/* ---------- * numeric.h - * * Definitions for the exact numeric data type of Postgres * * 1998 Jan Wieck * * $Header: /cvsroot/pgsql/src/include/utils/numeric.h,v 1.2 1998/12/30 20:46:06 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 * 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_ */