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/*-------------------------------------------------------------------------
*
* numeric.h
* Definitions for the exact numeric data type of Postgres
*
* Original coding 1998, Jan Wieck. Heavily revised 2003, Tom Lane.
*
* Copyright (c) 1998-2022, PostgreSQL Global Development Group
*
* src/include/utils/numeric.h
*
*-------------------------------------------------------------------------
*/
#ifndef _PG_NUMERIC_H_
#define _PG_NUMERIC_H_
#include "fmgr.h"
/*
* Limits on the precision and scale specifiable in a NUMERIC typmod. The
* precision is strictly positive, but the scale may be positive or negative.
* A negative scale implies rounding before the decimal point.
*
* Note that the minimum display scale defined below is zero --- we always
* display all digits before the decimal point, even when the scale is
* negative.
*
* Note that the implementation limits on the precision and display scale of a
* numeric value are much larger --- beware of what you use these for!
*/
#define NUMERIC_MAX_PRECISION 1000
#define NUMERIC_MIN_SCALE (-1000)
#define NUMERIC_MAX_SCALE 1000
/*
* Internal limits on the scales chosen for calculation results
*/
#define NUMERIC_MAX_DISPLAY_SCALE NUMERIC_MAX_PRECISION
#define NUMERIC_MIN_DISPLAY_SCALE 0
#define NUMERIC_MAX_RESULT_SCALE (NUMERIC_MAX_PRECISION * 2)
/*
* For inherently inexact calculations such as division and square root,
* we try to get at least this many significant digits; the idea is to
* deliver a result no worse than float8 would.
*/
#define NUMERIC_MIN_SIG_DIGITS 16
/* The actual contents of Numeric are private to numeric.c */
struct NumericData;
typedef struct NumericData *Numeric;
/*
* fmgr interface macros
*/
static inline Numeric
DatumGetNumeric(Datum X)
{
return (Numeric) PG_DETOAST_DATUM(X);
}
static inline Numeric
DatumGetNumericCopy(Datum X)
{
return (Numeric) PG_DETOAST_DATUM_COPY(X);
}
static inline Datum
NumericGetDatum(Numeric X)
{
return 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)
/*
* Utility functions in numeric.c
*/
extern bool numeric_is_nan(Numeric num);
extern bool numeric_is_inf(Numeric num);
extern int32 numeric_maximum_size(int32 typmod);
extern char *numeric_out_sci(Numeric num, int scale);
extern char *numeric_normalize(Numeric num);
extern Numeric int64_to_numeric(int64 val);
extern Numeric int64_div_fast_to_numeric(int64 val1, int log10val2);
extern Numeric numeric_add_opt_error(Numeric num1, Numeric num2,
bool *have_error);
extern Numeric numeric_sub_opt_error(Numeric num1, Numeric num2,
bool *have_error);
extern Numeric numeric_mul_opt_error(Numeric num1, Numeric num2,
bool *have_error);
extern Numeric numeric_div_opt_error(Numeric num1, Numeric num2,
bool *have_error);
extern Numeric numeric_mod_opt_error(Numeric num1, Numeric num2,
bool *have_error);
extern int32 numeric_int4_opt_error(Numeric num, bool *have_error);
#endif /* _PG_NUMERIC_H_ */
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