~drizzle-trunk/drizzle/development

/* 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; 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., 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_t;

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(decimal_t *from, char *to, int *to_len,

                   int fixed_precision, int fixed_decimals,

                   char filler);

int decimal2ulonglong(decimal_t *from, ulonglong *to);

int ulonglong2decimal(ulonglong from, decimal_t *to);

int decimal2longlong(decimal_t *from, longlong *to);

int longlong2decimal(longlong from, decimal_t *to);

int decimal2double(decimal_t *from, double *to);

int double2decimal(double from, decimal_t *to);

int decimal_actual_fraction(decimal_t *from);

int decimal2bin(decimal_t *from, uchar *to, int precision, int scale);

int bin2decimal(const uchar *from, decimal_t *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_t *from1, decimal_t *from2, char op,

                        int param);

int decimal_intg(decimal_t *from);

int decimal_add(decimal_t *from1, decimal_t *from2, decimal_t *to);

int decimal_sub(decimal_t *from1, decimal_t *from2, decimal_t *to);

int decimal_cmp(decimal_t *from1, decimal_t *from2);

int decimal_mul(decimal_t *from1, decimal_t *from2, decimal_t *to);

int decimal_div(decimal_t *from1, decimal_t *from2, decimal_t *to,

                int scale_incr);

int decimal_mod(decimal_t *from1, decimal_t *from2, decimal_t *to);

int decimal_round(decimal_t *from, decimal_t *to, int new_scale,

                  decimal_round_mode mode);

int decimal_is_zero(decimal_t *from);

void max_decimal(int precision, int 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

#endif