117 lines
4.4 KiB
C
117 lines
4.4 KiB
C
/* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; version 2 of the License.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */
|
|
|
|
#ifndef _decimal_h
|
|
#define _decimal_h
|
|
|
|
typedef enum
|
|
{TRUNCATE=0, HALF_EVEN, HALF_UP, CEILING, FLOOR}
|
|
decimal_round_mode;
|
|
typedef int32 decimal_digit_t;
|
|
|
|
/**
|
|
intg is the number of *decimal* digits (NOT number of decimal_digit_t's !)
|
|
before the point
|
|
frac is the number of decimal digits after the point
|
|
len is the length of buf (length of allocated space) in decimal_digit_t's,
|
|
not in bytes
|
|
sign false means positive, true means negative
|
|
buf is an array of decimal_digit_t's
|
|
*/
|
|
typedef struct st_decimal_t {
|
|
int intg, frac, len;
|
|
my_bool sign;
|
|
decimal_digit_t *buf;
|
|
} decimal_t;
|
|
|
|
int internal_str2dec(const char *from, decimal_t *to, char **end,
|
|
my_bool fixed);
|
|
int decimal2string(decimal_t *from, char *to, int *to_len,
|
|
int fixed_precision, int fixed_decimals,
|
|
char filler);
|
|
int decimal2ulonglong(decimal_t *from, ulonglong *to);
|
|
int ulonglong2decimal(ulonglong from, decimal_t *to);
|
|
int decimal2longlong(decimal_t *from, longlong *to);
|
|
int longlong2decimal(longlong from, decimal_t *to);
|
|
int decimal2double(decimal_t *from, double *to);
|
|
int double2decimal(double from, decimal_t *to);
|
|
int decimal_actual_fraction(decimal_t *from);
|
|
int decimal2bin(decimal_t *from, uchar *to, int precision, int scale);
|
|
int bin2decimal(const uchar *from, decimal_t *to, int precision, int scale);
|
|
|
|
int decimal_size(int precision, int scale);
|
|
int decimal_bin_size(int precision, int scale);
|
|
int decimal_result_size(decimal_t *from1, decimal_t *from2, char op,
|
|
int param);
|
|
|
|
int decimal_intg(decimal_t *from);
|
|
int decimal_add(decimal_t *from1, decimal_t *from2, decimal_t *to);
|
|
int decimal_sub(decimal_t *from1, decimal_t *from2, decimal_t *to);
|
|
int decimal_cmp(decimal_t *from1, decimal_t *from2);
|
|
int decimal_mul(decimal_t *from1, decimal_t *from2, decimal_t *to);
|
|
int decimal_div(decimal_t *from1, decimal_t *from2, decimal_t *to,
|
|
int scale_incr);
|
|
int decimal_mod(decimal_t *from1, decimal_t *from2, decimal_t *to);
|
|
int decimal_round(decimal_t *from, decimal_t *to, int new_scale,
|
|
decimal_round_mode mode);
|
|
int decimal_is_zero(decimal_t *from);
|
|
void max_decimal(int precision, int frac, decimal_t *to);
|
|
|
|
#define string2decimal(A,B,C) internal_str2dec((A), (B), (C), 0)
|
|
#define string2decimal_fixed(A,B,C) internal_str2dec((A), (B), (C), 1)
|
|
|
|
/* set a decimal_t to zero */
|
|
|
|
#define decimal_make_zero(dec) do { \
|
|
(dec)->buf[0]=0; \
|
|
(dec)->intg=1; \
|
|
(dec)->frac=0; \
|
|
(dec)->sign=0; \
|
|
} while(0)
|
|
|
|
/*
|
|
returns the length of the buffer to hold string representation
|
|
of the decimal (including decimal dot, possible sign and \0)
|
|
*/
|
|
|
|
#define decimal_string_size(dec) (((dec)->intg ? (dec)->intg : 1) + \
|
|
(dec)->frac + ((dec)->frac > 0) + 2)
|
|
|
|
/* negate a decimal */
|
|
#define decimal_neg(dec) do { (dec)->sign^=1; } while(0)
|
|
|
|
/*
|
|
conventions:
|
|
|
|
decimal_smth() == 0 -- everything's ok
|
|
decimal_smth() <= 1 -- result is usable, but precision loss is possible
|
|
decimal_smth() <= 2 -- result can be unusable, most significant digits
|
|
could've been lost
|
|
decimal_smth() > 2 -- no result was generated
|
|
*/
|
|
|
|
#define E_DEC_OK 0
|
|
#define E_DEC_TRUNCATED 1
|
|
#define E_DEC_OVERFLOW 2
|
|
#define E_DEC_DIV_ZERO 4
|
|
#define E_DEC_BAD_NUM 8
|
|
#define E_DEC_OOM 16
|
|
|
|
#define E_DEC_ERROR 31
|
|
#define E_DEC_FATAL_ERROR 30
|
|
|
|
#endif
|
|
|