pgtypes_numeric.h

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#ifndef PGTYPES_NUMERIC
#define PGTYPES_NUMERIC

#define NUMERIC_POS                     0x0000
#define NUMERIC_NEG                     0x4000
#define NUMERIC_NAN                     0xC000
#define NUMERIC_NULL                        0xF000
#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);
decimal    *PGTYPESdecimal_new(void);
void        PGTYPESnumeric_free(numeric *);
void        PGTYPESdecimal_free(decimal *);
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 */