pgtypes_numeric.h

PostgreSQL 8.1.4的源码 适用于Linux下的开源数据库系统

#ifndef PGTYPES_NUMERIC
#define PGTYPES_NUMERIC

#define NUMERIC_POS						0x0000
#define NUMERIC_NEG						0x4000
#define NUMERIC_NAN						0xC000
#define NUMERIC_MAX_PRECISION			1000
#define NUMERIC_MAX_DISPLAY_SCALE		NUMERIC_MAX_PRECISION
#define NUMERIC_MIN_DISPLAY_SCALE		0
#define NUMERIC_MIN_SIG_DIGITS			16

#define DECSIZE 30

typedef unsigned char NumericDigit;
typedef struct
{
	int			ndigits;		/* number of digits in digits[] - can be 0! */
	int			weight;			/* weight of first digit */
	int			rscale;			/* result scale */
	int			dscale;			/* display scale */
	int			sign;			/* NUMERIC_POS, NUMERIC_NEG, or NUMERIC_NAN */
	NumericDigit *buf;			/* start of alloc'd space for digits[] */
	NumericDigit *digits;		/* decimal digits */
} numeric;

typedef struct
{
	int			ndigits;		/* number of digits in digits[] - can be 0! */
	int			weight;			/* weight of first digit */
	int			rscale;			/* result scale */
	int			dscale;			/* display scale */
	int			sign;			/* NUMERIC_POS, NUMERIC_NEG, or NUMERIC_NAN */
	NumericDigit digits[DECSIZE];		/* decimal digits */
} decimal;

#ifdef __cplusplus
extern		"C"
{
#endif

numeric    *PGTYPESnumeric_new(void);
void		PGTYPESnumeric_free(numeric *);
numeric    *PGTYPESnumeric_from_asc(char *, char **);
char	   *PGTYPESnumeric_to_asc(numeric *, int);
int			PGTYPESnumeric_add(numeric *, numeric *, numeric *);
int			PGTYPESnumeric_sub(numeric *, numeric *, numeric *);
int			PGTYPESnumeric_mul(numeric *, numeric *, numeric *);
int			PGTYPESnumeric_div(numeric *, numeric *, numeric *);
int			PGTYPESnumeric_cmp(numeric *, numeric *);
int			PGTYPESnumeric_from_int(signed int, numeric *);
int			PGTYPESnumeric_from_long(signed long int, numeric *);
int			PGTYPESnumeric_copy(numeric *, numeric *);
int			PGTYPESnumeric_from_double(double, numeric *);
int			PGTYPESnumeric_to_double(numeric *, double *);
int			PGTYPESnumeric_to_int(numeric *, int *);
int			PGTYPESnumeric_to_long(numeric *, long *);
int			PGTYPESnumeric_to_decimal(numeric *, decimal *);
int			PGTYPESnumeric_from_decimal(decimal *, numeric *);

#ifdef __cplusplus
}
#endif

#endif   /* PGTYPES_NUMERIC */