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arbitrary precision decimal numbers

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strings/llstr.c:
  small optimization
BitKeeper/etc/ignore:
  Added strings/test_decimal to the ignore list
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unknown
2004-10-18 14:06:46 +02:00
parent 65ed693681
commit decc71e636
5 changed files with 1714 additions and 9 deletions
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include/decimal.h Normal file
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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>
#include <m_ctype.h>
#include <my_sys.h> /* for my_alloca */
typedef enum {TRUNCATE=0, EVEN} dec_round_mode;
typedef uint32 decimal_digit;
typedef struct st_decimal {
int intg, frac, len;
my_bool sign;
decimal_digit *buf;
} decimal;
int decimal2string(decimal *from, char *to, uint *to_len);
int string2decimal(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 decimal_add(decimal *from1, decimal *from2, decimal *to);
int decimal_sub(decimal *from1, decimal *from2, decimal *to);
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_result_size(decimal *from1, decimal *from2, char op, int param);
int decimal_round(decimal *dec, int new_scale, dec_round_mode mode);
/*
conventions:
decimal_smth() == 0 -- everything's ok
decimal_smth() <= 0 -- result is usable, precision loss is possible
decimal_smth() <= 1 -- result is unusable, but most significant digits
can be lost
decimal_smth() > 1 -- no result was generated
*/
#define E_DEC_TRUNCATED -1
#define E_DEC_OK 0
#define E_DEC_OVERFLOW 1
#define E_DEC_DIV_ZERO 2
#define E_DEC_BAD_NUM 3
#define E_DEC_OOM 4
#endif