1/* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
2
3 This program is free software; you can redistribute it and/or modify
4 it under the terms of the GNU General Public License as published by
5 the Free Software Foundation; version 2 of the License.
6
7 This program is distributed in the hope that it will be useful,
8 but WITHOUT ANY WARRANTY; without even the implied warranty of
9 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 GNU General Public License for more details.
11
12 You should have received a copy of the GNU General Public License
13 along with this program; if not, write to the Free Software
14 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
15
16#ifndef _decimal_h
17#define _decimal_h
18
19#ifdef __cplusplus
20extern "C" {
21#endif
22
23typedef enum
24{TRUNCATE=0, HALF_EVEN, HALF_UP, CEILING, FLOOR}
25 decimal_round_mode;
26typedef int32 decimal_digit_t;
27
28/**
29 intg is the number of *decimal* digits (NOT number of decimal_digit_t's !)
30 before the point
31 frac is the number of decimal digits after the point
32 len is the length of buf (length of allocated space) in decimal_digit_t's,
33 not in bytes
34 sign false means positive, true means negative
35 buf is an array of decimal_digit_t's
36 */
37typedef struct st_decimal_t {
38 int intg, frac, len;
39 my_bool sign;
40 decimal_digit_t *buf;
41} decimal_t;
42
43int internal_str2dec(const char *from, decimal_t *to, char **end,
44 my_bool fixed);
45int decimal2string(const decimal_t *from, char *to, int *to_len,
46 int fixed_precision, int fixed_decimals,
47 char filler);
48int decimal2ulonglong(const decimal_t *from, ulonglong *to);
49int ulonglong2decimal(ulonglong from, decimal_t *to);
50int decimal2longlong(const decimal_t *from, longlong *to);
51int longlong2decimal(longlong from, decimal_t *to);
52int decimal2double(const decimal_t *from, double *to);
53int double2decimal(double from, decimal_t *to);
54int decimal_actual_fraction(const decimal_t *from);
55int decimal2bin(const decimal_t *from, uchar *to, int precision, int scale);
56int bin2decimal(const uchar *from, decimal_t *to, int precision, int scale);
57
58int decimal_size(int precision, int scale);
59int decimal_bin_size(int precision, int scale);
60int decimal_result_size(decimal_t *from1, decimal_t *from2, char op,
61 int param);
62
63int decimal_intg(const decimal_t *from);
64int decimal_add(const decimal_t *from1, const decimal_t *from2, decimal_t *to);
65int decimal_sub(const decimal_t *from1, const decimal_t *from2, decimal_t *to);
66int decimal_cmp(const decimal_t *from1, const decimal_t *from2);
67int decimal_mul(const decimal_t *from1, const decimal_t *from2, decimal_t *to);
68int decimal_div(const decimal_t *from1, const decimal_t *from2, decimal_t *to,
69 int scale_incr);
70int decimal_mod(const decimal_t *from1, const decimal_t *from2, decimal_t *to);
71int decimal_round(const decimal_t *from, decimal_t *to, int new_scale,
72 decimal_round_mode mode);
73int decimal_is_zero(const decimal_t *from);
74void max_decimal(int precision, int frac, decimal_t *to);
75
76#define string2decimal(A,B,C) internal_str2dec((A), (B), (C), 0)
77#define string2decimal_fixed(A,B,C) internal_str2dec((A), (B), (C), 1)
78
79/* set a decimal_t to zero */
80
81#define decimal_make_zero(dec) do { \
82 (dec)->buf[0]=0; \
83 (dec)->intg=1; \
84 (dec)->frac=0; \
85 (dec)->sign=0; \
86 } while(0)
87
88/*
89 returns the length of the buffer to hold string representation
90 of the decimal (including decimal dot, possible sign and \0)
91*/
92
93#define decimal_string_size(dec) (((dec)->intg ? (dec)->intg : 1) + \
94 (dec)->frac + ((dec)->frac > 0) + 2)
95
96/* negate a decimal */
97#define decimal_neg(dec) do { (dec)->sign^=1; } while(0)
98
99/*
100 conventions:
101
102 decimal_smth() == 0 -- everything's ok
103 decimal_smth() <= 1 -- result is usable, but precision loss is possible
104 decimal_smth() <= 2 -- result can be unusable, most significant digits
105 could've been lost
106 decimal_smth() > 2 -- no result was generated
107*/
108
109#define E_DEC_OK 0
110#define E_DEC_TRUNCATED 1
111#define E_DEC_OVERFLOW 2
112#define E_DEC_DIV_ZERO 4
113#define E_DEC_BAD_NUM 8
114#define E_DEC_OOM 16
115
116#define E_DEC_ERROR 31
117#define E_DEC_FATAL_ERROR 30
118
119#ifdef __cplusplus
120}
121#endif
122
123#endif
124
125