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/mysql/include/mysql/decimal.h

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C++ Header | 107 lines | 61 code | 17 blank | 29 comment | 0 complexity | a58221ead6427ccd16b2875113ee4ca5 MD5 | raw file
  1/* Copyright (C) 2000 MySQL AB
  2
  3   This program is free software; you can redistribute it and/or modify
  4   it under the terms of the GNU General Public License as published by
  5   the Free Software Foundation; version 2 of the License.
  6
  7   This program is distributed in the hope that it will be useful,
  8   but WITHOUT ANY WARRANTY; without even the implied warranty of
  9   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 10   GNU General Public License for more details.
 11
 12   You should have received a copy of the GNU General Public License
 13   along with this program; if not, write to the Free Software
 14   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
 15
 16#ifndef _decimal_h
 17#define _decimal_h
 18
 19typedef enum
 20{TRUNCATE=0, HALF_EVEN, HALF_UP, CEILING, FLOOR}
 21  decimal_round_mode;
 22typedef int32 decimal_digit_t;
 23
 24typedef struct st_decimal_t {
 25  int    intg, frac, len;
 26  my_bool sign;
 27  decimal_digit_t *buf;
 28} decimal_t;
 29
 30int internal_str2dec(const char *from, decimal_t *to, char **end,
 31                     my_bool fixed);
 32int decimal2string(decimal_t *from, char *to, int *to_len,
 33                   int fixed_precision, int fixed_decimals,
 34                   char filler);
 35int decimal2ulonglong(decimal_t *from, ulonglong *to);
 36int ulonglong2decimal(ulonglong from, decimal_t *to);
 37int decimal2longlong(decimal_t *from, longlong *to);
 38int longlong2decimal(longlong from, decimal_t *to);
 39int decimal2double(decimal_t *from, double *to);
 40int double2decimal(double from, decimal_t *to);
 41int decimal_actual_fraction(decimal_t *from);
 42int decimal2bin(decimal_t *from, uchar *to, int precision, int scale);
 43int bin2decimal(const uchar *from, decimal_t *to, int precision, int scale);
 44
 45int decimal_size(int precision, int scale);
 46int decimal_bin_size(int precision, int scale);
 47int decimal_result_size(decimal_t *from1, decimal_t *from2, char op,
 48                        int param);
 49
 50int decimal_intg(decimal_t *from);
 51int decimal_add(decimal_t *from1, decimal_t *from2, decimal_t *to);
 52int decimal_sub(decimal_t *from1, decimal_t *from2, decimal_t *to);
 53int decimal_cmp(decimal_t *from1, decimal_t *from2);
 54int decimal_mul(decimal_t *from1, decimal_t *from2, decimal_t *to);
 55int decimal_div(decimal_t *from1, decimal_t *from2, decimal_t *to,
 56                int scale_incr);
 57int decimal_mod(decimal_t *from1, decimal_t *from2, decimal_t *to);
 58int decimal_round(decimal_t *from, decimal_t *to, int new_scale,
 59                  decimal_round_mode mode);
 60int decimal_is_zero(decimal_t *from);
 61void max_decimal(int precision, int frac, decimal_t *to);
 62
 63#define string2decimal(A,B,C) internal_str2dec((A), (B), (C), 0)
 64#define string2decimal_fixed(A,B,C) internal_str2dec((A), (B), (C), 1)
 65
 66/* set a decimal_t to zero */
 67
 68#define decimal_make_zero(dec)        do {                \
 69                                        (dec)->buf[0]=0;    \
 70                                        (dec)->intg=1;      \
 71                                        (dec)->frac=0;      \
 72                                        (dec)->sign=0;      \
 73                                      } while(0)
 74
 75/*
 76  returns the length of the buffer to hold string representation
 77  of the decimal (including decimal dot, possible sign and \0)
 78*/
 79
 80#define decimal_string_size(dec) (((dec)->intg ? (dec)->intg : 1) + \
 81				  (dec)->frac + ((dec)->frac > 0) + 2)
 82
 83/* negate a decimal */
 84#define decimal_neg(dec) do { (dec)->sign^=1; } while(0)
 85
 86/*
 87  conventions:
 88
 89    decimal_smth() == 0     -- everything's ok
 90    decimal_smth() <= 1     -- result is usable, but precision loss is possible
 91    decimal_smth() <= 2     -- result can be unusable, most significant digits
 92                               could've been lost
 93    decimal_smth() >  2     -- no result was generated
 94*/
 95
 96#define E_DEC_OK                0
 97#define E_DEC_TRUNCATED         1
 98#define E_DEC_OVERFLOW          2
 99#define E_DEC_DIV_ZERO          4
100#define E_DEC_BAD_NUM           8
101#define E_DEC_OOM              16
102
103#define E_DEC_ERROR            31
104#define E_DEC_FATAL_ERROR      30
105
106#endif
107