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/* Copyright (C) 2000 MySQL AB
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; either version 2 of the License, or
(at your option) any later version.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#ifndef _decimal_h
#define _decimal_h
#include <my_global.h>
typedef enum {TRUNCATE=0, HALF_EVEN, HALF_UP} decimal_round_mode;
typedef int32 decimal_digit;
typedef struct st_decimal {
int intg, frac, len;
my_bool sign;
decimal_digit *buf;
} decimal;
int decimal2string(decimal *from, char *to, int *to_len);
int string2decimal(char *from, decimal *to, char **end);
int string2decimal_fixed(char *from, decimal *to, char **end);
int decimal2ulonglong(decimal *from, ulonglong *to);
int ulonglong2decimal(ulonglong from, decimal *to);
int decimal2longlong(decimal *from, longlong *to);
int longlong2decimal(longlong from, decimal *to);
int decimal2double(decimal *from, double *to);
int double2decimal(double from, decimal *to);
int decimal2bin(decimal *from, char *to, int precision, int scale);
int bin2decimal(char *from, decimal *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 *from1, decimal *from2, char op, int param);
int decimal_add(decimal *from1, decimal *from2, decimal *to);
int decimal_sub(decimal *from1, decimal *from2, decimal *to);
int decimal_cmp(decimal *from1, decimal *from2);
int decimal_mul(decimal *from1, decimal *from2, decimal *to);
int decimal_div(decimal *from1, decimal *from2, decimal *to, int scale_incr);
int decimal_mod(decimal *from1, decimal *from2, decimal *to);
int decimal_round(decimal *from, decimal *to, int new_scale, decimal_round_mode mode);
/*
the following works only on special "zero" decimal, not on any
decimal that happen to evaluate to zero
*/
#define decimal_is_zero(dec) ((dec)->intg1==1 && (dec)->frac1==0 && (dec)->buf[0]==0)
/* set a decimal 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
*/
#define decimal_string_size(dec) ((dec)->intg + (dec)->frac + ((dec)->frac > 0) + 1)
/* 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 3
#define E_DEC_BAD_NUM 4
#define E_DEC_OOM 5
#endif
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