/* 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 typedef enum {TRUNCATE=0, HALF_EVEN, HALF_UP, CEILING, FLOOR} 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); int decimal_is_zero(decimal *from); /* 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 (including decimal dot, possible sign and \0) */ #define decimal_string_size(dec) ((dec)->intg + (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