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69 lines
2.4 KiB
C
69 lines
2.4 KiB
C
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/* Copyright (C) 2000 MySQL AB
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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; either version 2 of the License, or
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(at your option) any later version.
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#ifndef _decimal_h
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#define _decimal_h
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#include <my_global.h>
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#include <m_ctype.h>
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#include <my_sys.h> /* for my_alloca */
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typedef enum {TRUNCATE=0, EVEN} dec_round_mode;
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typedef uint32 decimal_digit;
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typedef struct st_decimal {
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int intg, frac, len;
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my_bool sign;
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decimal_digit *buf;
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} decimal;
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int decimal2string(decimal *from, char *to, uint *to_len);
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int string2decimal(char *from, decimal *to, char **end);
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int decimal2ulonglong(decimal *from, ulonglong *to);
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int ulonglong2decimal(ulonglong from, decimal *to);
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int decimal2longlong(decimal *from, longlong *to);
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int longlong2decimal(longlong from, decimal *to);
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int decimal2double(decimal *from, double *to);
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int double2decimal(double from, decimal *to);
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int decimal_add(decimal *from1, decimal *from2, decimal *to);
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int decimal_sub(decimal *from1, decimal *from2, decimal *to);
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int decimal_mul(decimal *from1, decimal *from2, decimal *to);
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int decimal_div(decimal *from1, decimal *from2, decimal *to, int scale_incr);
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int decimal_mod(decimal *from1, decimal *from2, decimal *to);
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int decimal_result_size(decimal *from1, decimal *from2, char op, int param);
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int decimal_round(decimal *dec, int new_scale, dec_round_mode mode);
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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() <= 0 -- result is usable, precision loss is possible
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decimal_smth() <= 1 -- result is unusable, but most significant digits
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can be lost
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decimal_smth() > 1 -- no result was generated
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*/
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#define E_DEC_TRUNCATED -1
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#define E_DEC_OK 0
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#define E_DEC_OVERFLOW 1
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#define E_DEC_DIV_ZERO 2
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#define E_DEC_BAD_NUM 3
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#define E_DEC_OOM 4
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#endif
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