117 lines
4.4 KiB
C
117 lines
4.4 KiB
C
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/* Copyright (c) 2000, 2011, 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 as published by
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the Free Software Foundation; version 2 of the License.
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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 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 Street, Fifth Floor, Boston, MA 02110-1301, USA */
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#ifndef _decimal_h
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#define _decimal_h
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typedef enum
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{TRUNCATE=0, HALF_EVEN, HALF_UP, CEILING, 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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typedef struct st_decimal_t {
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int intg, frac, len;
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my_bool sign;
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decimal_digit_t *buf;
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} decimal_t;
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int internal_str2dec(const char *from, decimal_t *to, char **end,
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my_bool fixed);
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int decimal2string(decimal_t *from, char *to, int *to_len,
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int fixed_precision, int fixed_decimals,
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char filler);
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int decimal2ulonglong(decimal_t *from, ulonglong *to);
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int ulonglong2decimal(ulonglong from, decimal_t *to);
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int decimal2longlong(decimal_t *from, longlong *to);
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int longlong2decimal(longlong from, decimal_t *to);
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int decimal2double(decimal_t *from, double *to);
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int double2decimal(double from, decimal_t *to);
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int decimal_actual_fraction(decimal_t *from);
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int decimal2bin(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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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(decimal_t *from1, decimal_t *from2, char op,
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int param);
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int decimal_intg(decimal_t *from);
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int decimal_add(decimal_t *from1, decimal_t *from2, decimal_t *to);
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int decimal_sub(decimal_t *from1, decimal_t *from2, decimal_t *to);
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int decimal_cmp(decimal_t *from1, decimal_t *from2);
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int decimal_mul(decimal_t *from1, decimal_t *from2, decimal_t *to);
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int decimal_div(decimal_t *from1, decimal_t *from2, decimal_t *to,
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int scale_incr);
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int decimal_mod(decimal_t *from1, decimal_t *from2, decimal_t *to);
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int decimal_round(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(decimal_t *from);
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void max_decimal(int precision, int frac, decimal_t *to);
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#define string2decimal(A,B,C) internal_str2dec((A), (B), (C), 0)
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#define string2decimal_fixed(A,B,C) internal_str2dec((A), (B), (C), 1)
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/* set a decimal_t to zero */
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#define decimal_make_zero(dec) do { \
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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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} while(0)
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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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#define decimal_string_size(dec) (((dec)->intg ? (dec)->intg : 1) + \
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(dec)->frac + ((dec)->frac > 0) + 2)
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/* negate a decimal */
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#define decimal_neg(dec) do { (dec)->sign^=1; } while(0)
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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 possible
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decimal_smth() <= 2 -- result can be unusable, most significant digits
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could've been lost
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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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#endif
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