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154 lines
5.4 KiB
154 lines
5.4 KiB
/* Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#ifndef DECIMAL_INCLUDED
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#define DECIMAL_INCLUDED
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#ifndef MYSQL_ABI_CHECK
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#include <stdlib.h>
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#endif
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#include "my_inttypes.h"
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#include "my_macros.h"
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typedef enum {
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TRUNCATE = 0,
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HALF_EVEN,
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HALF_UP,
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CEILING,
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FLOOR
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} decimal_round_mode;
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typedef int32 decimal_digit_t;
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/**
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intg is the number of *decimal* digits (NOT number of decimal_digit_t's !)
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before the point
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frac is the number of decimal digits after the point
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len is the length of buf (length of allocated space) in decimal_digit_t's,
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not in bytes
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sign false means positive, true means negative
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buf is an array of decimal_digit_t's
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*/
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struct decimal_t {
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int intg, frac, len;
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bool sign;
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decimal_digit_t *buf;
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};
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#ifndef MYSQL_ABI_CHECK
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void widen_fraction(int new_frac, decimal_t *d);
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int string2decimal(const char *from, decimal_t *to, const char **end);
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int decimal2string(const decimal_t *from, char *to, int *to_len,
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int fixed_precision, int fixed_decimals, char filler);
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int decimal2ulonglong(const decimal_t *from, ulonglong *to);
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int ulonglong2decimal(ulonglong from, decimal_t *to);
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int decimal2longlong(const decimal_t *from, longlong *to);
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int longlong2decimal(longlong from, decimal_t *to);
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int decimal2double(const decimal_t *from, double *to);
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int double2decimal(double from, decimal_t *to);
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int decimal_actual_fraction(const decimal_t *from);
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int decimal2bin(const decimal_t *from, uchar *to, int precision, int scale);
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int bin2decimal(const uchar *from, decimal_t *to, int precision, int scale,
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bool keep_prec = false);
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/**
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Convert decimal to lldiv_t.
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The integer part is stored in to->quot.
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The fractional part is multiplied to 10^9 and stored to to->rem.
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@param from Decimal value
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@param [out] to lldiv_t value
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@retval 0 on success
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@retval !0 in error
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*/
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int decimal2lldiv_t(const decimal_t *from, lldiv_t *to);
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/**
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Convert doube to lldiv_t.
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The integer part is stored in to->quot.
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The fractional part is multiplied to 10^9 and stored to to->rem.
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@param nr Decimal value
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@param [out] lld lldiv_t value
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@retval 0 on success
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@retval !0 in error
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*/
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int double2lldiv_t(double nr, lldiv_t *lld);
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int decimal_size(int precision, int scale);
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int decimal_bin_size(int precision, int scale);
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int decimal_result_size(const decimal_t *from1, const decimal_t *from2, char op,
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int param);
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int decimal_intg(const decimal_t *from);
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int decimal_add(const decimal_t *from1, const decimal_t *from2, decimal_t *to);
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int decimal_sub(const decimal_t *from1, const decimal_t *from2, decimal_t *to);
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int decimal_cmp(const decimal_t *from1, const decimal_t *from2);
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int decimal_mul(const decimal_t *from1, const decimal_t *from2, decimal_t *to);
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int decimal_div(const decimal_t *from1, const decimal_t *from2, decimal_t *to,
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int scale_incr);
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int decimal_mod(const decimal_t *from1, const decimal_t *from2, decimal_t *to);
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int decimal_round(const decimal_t *from, decimal_t *to, int new_scale,
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decimal_round_mode mode);
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int decimal_is_zero(const decimal_t *from);
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void max_decimal(int precision, int frac, decimal_t *to);
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int decimal_shift(decimal_t *dec, int shift);
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/* set a decimal_t to zero */
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static inline void decimal_make_zero(decimal_t *dec) {
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dec->buf[0] = 0;
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dec->intg = 1;
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dec->frac = 0;
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dec->sign = 0;
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}
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/**
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Returns the length of the buffer to hold string representation
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of the decimal (including decimal dot, possible sign and \0)
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*/
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static inline int decimal_string_size(const decimal_t *dec) {
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return (dec->intg ? dec->intg : 1) + dec->frac + (dec->frac > 0) + 2;
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}
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/*
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conventions:
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decimal_smth() == 0 -- everything's ok
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decimal_smth() <= 1 -- result is usable, but precision loss is
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possible decimal_smth() <= 2 -- result can be unusable, most significant
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digits could've been lost decimal_smth() > 2 -- no result was generated
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*/
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#define E_DEC_OK 0
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#define E_DEC_TRUNCATED 1
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#define E_DEC_OVERFLOW 2
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#define E_DEC_DIV_ZERO 4
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#define E_DEC_BAD_NUM 8
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#define E_DEC_OOM 16
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#define E_DEC_ERROR 31
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#define E_DEC_FATAL_ERROR 30
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static constexpr int DECIMAL_MAX_SCALE{30};
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static constexpr int DECIMAL_NOT_SPECIFIED{DECIMAL_MAX_SCALE + 1};
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#endif // MYSQL_ABI_CHECK
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#endif // DECIMAL_INCLUDED
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