1
/* Copyright (C) 2000 MySQL AB
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.
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.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
20
{TRUNCATE=0, HALF_EVEN, HALF_UP, CEILING, FLOOR}
22
typedef int32 decimal_digit_t;
24
typedef struct st_decimal_t {
30
int internal_str2dec(const char *from, decimal_t *to, char **end,
32
int decimal2string(decimal_t *from, char *to, int *to_len,
33
int fixed_precision, int fixed_decimals,
35
int decimal2ulonglong(decimal_t *from, ulonglong *to);
36
int ulonglong2decimal(ulonglong from, decimal_t *to);
37
int decimal2longlong(decimal_t *from, longlong *to);
38
int longlong2decimal(longlong from, decimal_t *to);
39
int decimal2double(decimal_t *from, double *to);
40
int double2decimal(double from, decimal_t *to);
41
int decimal_actual_fraction(decimal_t *from);
42
int decimal2bin(decimal_t *from, uchar *to, int precision, int scale);
43
int bin2decimal(const uchar *from, decimal_t *to, int precision, int scale);
45
int decimal_size(int precision, int scale);
46
int decimal_bin_size(int precision, int scale);
47
int decimal_result_size(decimal_t *from1, decimal_t *from2, char op,
50
int decimal_intg(decimal_t *from);
51
int decimal_add(decimal_t *from1, decimal_t *from2, decimal_t *to);
52
int decimal_sub(decimal_t *from1, decimal_t *from2, decimal_t *to);
53
int decimal_cmp(decimal_t *from1, decimal_t *from2);
54
int decimal_mul(decimal_t *from1, decimal_t *from2, decimal_t *to);
55
int decimal_div(decimal_t *from1, decimal_t *from2, decimal_t *to,
57
int decimal_mod(decimal_t *from1, decimal_t *from2, decimal_t *to);
58
int decimal_round(decimal_t *from, decimal_t *to, int new_scale,
59
decimal_round_mode mode);
60
int decimal_is_zero(decimal_t *from);
61
void max_decimal(int precision, int frac, decimal_t *to);
63
#define string2decimal(A,B,C) internal_str2dec((A), (B), (C), 0)
64
#define string2decimal_fixed(A,B,C) internal_str2dec((A), (B), (C), 1)
66
/* set a decimal_t to zero */
68
#define decimal_make_zero(dec) do { \
76
returns the length of the buffer to hold string representation
77
of the decimal (including decimal dot, possible sign and \0)
80
#define decimal_string_size(dec) (((dec)->intg ? (dec)->intg : 1) + \
81
(dec)->frac + ((dec)->frac > 0) + 2)
83
/* negate a decimal */
84
#define decimal_neg(dec) do { (dec)->sign^=1; } while(0)
89
decimal_smth() == 0 -- everything's ok
90
decimal_smth() <= 1 -- result is usable, but precision loss is possible
91
decimal_smth() <= 2 -- result can be unusable, most significant digits
93
decimal_smth() > 2 -- no result was generated
97
#define E_DEC_TRUNCATED 1
98
#define E_DEC_OVERFLOW 2
99
#define E_DEC_DIV_ZERO 4
100
#define E_DEC_BAD_NUM 8
103
#define E_DEC_ERROR 31
104
#define E_DEC_FATAL_ERROR 30