Current File : //usr/include/mysql/server/decimal.h
/* 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 St, Fifth Floor, Boston, MA 02110-1335 USA */
#ifndef _decimal_h
#define _decimal_h
#ifdef __cplusplus
extern "C" {
#endif
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(const decimal_t *from, char *to, int *to_len,
decimal_digits_t fixed_precision,
decimal_digits_t fixed_decimals,
char filler);
int decimal2ulonglong(const decimal_t *from, ulonglong *to);
int ulonglong2decimal(ulonglong from, decimal_t *to);
int decimal2longlong(const decimal_t *from, longlong *to);
int longlong2decimal(longlong from, decimal_t *to);
int decimal2double(const decimal_t *from, double *to);
int double2decimal(double from, decimal_t *to);
decimal_digits_t decimal_actual_fraction(const decimal_t *from);
int decimal2bin(const decimal_t *from, uchar *to, decimal_digits_t precision,
decimal_digits_t scale);
int bin2decimal(const uchar *from, decimal_t *to, decimal_digits_t precision,
decimal_digits_t scale);
uint decimal_size(decimal_digits_t precision, decimal_digits_t scale);
uint decimal_bin_size(decimal_digits_t precision, decimal_digits_t scale);
uint decimal_result_size(decimal_t *from1, decimal_t *from2, char op,
int param);
decimal_digits_t decimal_intg(const decimal_t *from);
int decimal_add(const decimal_t *from1, const decimal_t *from2, decimal_t *to);
int decimal_sub(const decimal_t *from1, const decimal_t *from2, decimal_t *to);
int decimal_cmp(const decimal_t *from1, const decimal_t *from2);
int decimal_mul(const decimal_t *from1, const decimal_t *from2, decimal_t *to);
int decimal_div(const decimal_t *from1, const decimal_t *from2, decimal_t *to,
int scale_incr);
int decimal_mod(const decimal_t *from1, const decimal_t *from2, decimal_t *to);
int decimal_round(const decimal_t *from, decimal_t *to, int new_scale,
decimal_round_mode mode);
int decimal_is_zero(const decimal_t *from);
void max_decimal(decimal_digits_t precision, decimal_digits_t 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
#ifdef __cplusplus
}
#endif
#endif
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