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Diffstat (limited to 'include/decimal.h')
| -rw-r--r-- | include/decimal.h | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/include/decimal.h b/include/decimal.h new file mode 100644 index 00000000000..5b5b8c0b460 --- /dev/null +++ b/include/decimal.h @@ -0,0 +1,102 @@ +/* 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, 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); + +/* + 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 (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 + |