pgtypes_numeric.h

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#ifndef PGTYPES_NUMERIC
#define PGTYPES_NUMERIC
 
#include <pgtypes.h>
 
#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 *var);
void        PGTYPESdecimal_free(decimal *var);
numeric    *PGTYPESnumeric_from_asc(char *str, char **endptr);
char       *PGTYPESnumeric_to_asc(numeric *num, int dscale);
int         PGTYPESnumeric_add(numeric *var1, numeric *var2, numeric *result);
int         PGTYPESnumeric_sub(numeric *var1, numeric *var2, numeric *result);
int         PGTYPESnumeric_mul(numeric *var1, numeric *var2, numeric *result);
int         PGTYPESnumeric_div(numeric *var1, numeric *var2, numeric *result);
int         PGTYPESnumeric_cmp(numeric *var1, numeric *var2);
int         PGTYPESnumeric_from_int(signed int int_val, numeric *var);
int         PGTYPESnumeric_from_long(signed long int long_val, numeric *var);
int         PGTYPESnumeric_copy(numeric *src, numeric *dst);
int         PGTYPESnumeric_from_double(double d, numeric *dst);
int         PGTYPESnumeric_to_double(numeric *nv, double *dp);
int         PGTYPESnumeric_to_int(numeric *nv, int *ip);
int         PGTYPESnumeric_to_long(numeric *nv, long *lp);
int         PGTYPESnumeric_to_decimal(numeric *src, decimal *dst);
int         PGTYPESnumeric_from_decimal(decimal *src, numeric *dst);
 
#ifdef __cplusplus
}
#endif
 
#endif                          /* PGTYPES_NUMERIC */