/* Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.

 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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;

/**
 intg is the number of *decimal* digits (NOT number of decimal_digit_t's !)
 before the point
 frac is the number of decimal digits after the point
 len is the length of buf (length of allocated space) in decimal_digit_t's,
 not in bytes
 sign false means positive, true means negative
 buf is an array of decimal_digit_t's
 */
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(const 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(const 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);

/**
 Convert decimal to lldiv_t.
 The integer part is stored in to->quot.
 The fractional part is multiplied to 10^9 and stored to to->rem.
 @param from Decimal value
 @param to lldiv_t value
 @retval 0 on success
 @retval !0 in error
*/
int decimal2lldiv_t(const decimal_t *from, lldiv_t *to);

/**
 Convert doube to lldiv_t.
 The integer part is stored in to->quot.
 The fractional part is multiplied to 10^9 and stored to to->rem.
 @param from Decimal value
 @param to lldiv_t value
 @retval 0 on success
 @retval !0 in error
*/

int double2lldiv_t(double from, lldiv_t *to);
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(const decimal_t *from);
int decimal_add(const decimal_t *from1, const decimal_t *from2, decimal_t *to);
int decimal_sub(const decimal_t *from1, const decimal_t *from2, decimal_t *to);
int decimal_cmp(const decimal_t *from1, const decimal_t *from2);
int decimal_mul(const decimal_t *from1, const decimal_t *from2, decimal_t *to);
int decimal_div(const decimal_t *from1, const decimal_t *from2, decimal_t *to,
 int scale_incr);
int decimal_mod(const decimal_t *from1, const decimal_t *from2, decimal_t *to);
int decimal_round(const decimal_t *from, decimal_t *to, int new_scale,
 decimal_round_mode mode);
int decimal_is_zero(const 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円)
*/

#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