Age Owner TLA Line data Source code
1 : /*-------------------------------------------------------------------------
2 : *
3 : * numeric.h
4 : * Definitions for the exact numeric data type of Postgres
5 : *
6 : * Original coding 1998, Jan Wieck. Heavily revised 2003, Tom Lane.
7 : *
8 : * Copyright (c) 1998-2023, PostgreSQL Global Development Group
9 : *
10 : * src/include/utils/numeric.h
11 : *
12 : *-------------------------------------------------------------------------
13 : */
14 : #ifndef _PG_NUMERIC_H_
15 : #define _PG_NUMERIC_H_
16 :
17 : #include "fmgr.h"
18 :
19 : /*
20 : * Limits on the precision and scale specifiable in a NUMERIC typmod. The
21 : * precision is strictly positive, but the scale may be positive or negative.
22 : * A negative scale implies rounding before the decimal point.
23 : *
24 : * Note that the minimum display scale defined below is zero --- we always
25 : * display all digits before the decimal point, even when the scale is
26 : * negative.
27 : *
28 : * Note that the implementation limits on the precision and display scale of a
29 : * numeric value are much larger --- beware of what you use these for!
30 : */
31 : #define NUMERIC_MAX_PRECISION 1000
32 :
33 : #define NUMERIC_MIN_SCALE (-1000)
34 : #define NUMERIC_MAX_SCALE 1000
35 :
36 : /*
37 : * Internal limits on the scales chosen for calculation results
38 : */
39 : #define NUMERIC_MAX_DISPLAY_SCALE NUMERIC_MAX_PRECISION
40 : #define NUMERIC_MIN_DISPLAY_SCALE 0
41 :
42 : #define NUMERIC_MAX_RESULT_SCALE (NUMERIC_MAX_PRECISION * 2)
43 :
44 : /*
45 : * For inherently inexact calculations such as division and square root,
46 : * we try to get at least this many significant digits; the idea is to
47 : * deliver a result no worse than float8 would.
48 : */
49 : #define NUMERIC_MIN_SIG_DIGITS 16
50 :
51 : /* The actual contents of Numeric are private to numeric.c */
52 : struct NumericData;
53 : typedef struct NumericData *Numeric;
54 :
55 : /*
56 : * fmgr interface macros
57 : */
58 :
59 : static inline Numeric
194 peter 60 GNC 9367488 : DatumGetNumeric(Datum X)
61 : {
62 9367488 : return (Numeric) PG_DETOAST_DATUM(X);
63 : }
64 :
65 : static inline Numeric
66 9 : DatumGetNumericCopy(Datum X)
67 : {
68 9 : return (Numeric) PG_DETOAST_DATUM_COPY(X);
69 : }
70 :
71 : static inline Datum
72 1746197 : NumericGetDatum(Numeric X)
73 : {
74 1746197 : return PointerGetDatum(X);
75 : }
76 :
8053 bruce 77 ECB : #define PG_GETARG_NUMERIC(n) DatumGetNumeric(PG_GETARG_DATUM(n))
78 : #define PG_GETARG_NUMERIC_COPY(n) DatumGetNumericCopy(PG_GETARG_DATUM(n))
79 : #define PG_RETURN_NUMERIC(x) return NumericGetDatum(x)
80 :
4990 tgl 81 : /*
82 : * Utility functions in numeric.c
83 : */
84 : extern bool numeric_is_nan(Numeric num);
85 : extern bool numeric_is_inf(Numeric num);
86 : extern int32 numeric_maximum_size(int32 typmod);
87 : extern char *numeric_out_sci(Numeric num, int scale);
88 : extern char *numeric_normalize(Numeric num);
89 :
90 : extern Numeric int64_to_numeric(int64 val);
91 : extern Numeric int64_div_fast_to_numeric(int64 val1, int log10val2);
92 :
93 : extern Numeric numeric_add_opt_error(Numeric num1, Numeric num2,
94 : bool *have_error);
95 : extern Numeric numeric_sub_opt_error(Numeric num1, Numeric num2,
96 : bool *have_error);
97 : extern Numeric numeric_mul_opt_error(Numeric num1, Numeric num2,
98 : bool *have_error);
99 : extern Numeric numeric_div_opt_error(Numeric num1, Numeric num2,
100 : bool *have_error);
101 : extern Numeric numeric_mod_opt_error(Numeric num1, Numeric num2,
102 : bool *have_error);
103 : extern int32 numeric_int4_opt_error(Numeric num, bool *have_error);
104 :
105 : #endif /* _PG_NUMERIC_H_ */
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