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Diffstat (limited to 'include/decimal.h')
| -rw-r--r-- | include/decimal.h | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/include/decimal.h b/include/decimal.h new file mode 100644 index 00000000..02725fe0 --- /dev/null +++ b/include/decimal.h @@ -0,0 +1,128 @@ +/* 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 02110-1335 USA */ + +#ifndef _decimal_h +#define _decimal_h + +#ifdef __cplusplus +extern "C" { +#endif + +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, + decimal_digits_t fixed_precision, + decimal_digits_t fixed_decimals, + char filler); +int decimal2ulonglong(const decimal_t *from, ulonglong *to); +int ulonglong2decimal(ulonglong from, decimal_t *to); +int decimal2longlong(const 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); +decimal_digits_t decimal_actual_fraction(const decimal_t *from); +int decimal2bin(const decimal_t *from, uchar *to, decimal_digits_t precision, + decimal_digits_t scale); +int bin2decimal(const uchar *from, decimal_t *to, decimal_digits_t precision, + decimal_digits_t scale); + +uint decimal_size(decimal_digits_t precision, decimal_digits_t scale); +uint decimal_bin_size(decimal_digits_t precision, decimal_digits_t scale); +uint decimal_result_size(decimal_t *from1, decimal_t *from2, char op, + int param); + +decimal_digits_t 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(decimal_digits_t precision, decimal_digits_t 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 + +#ifdef __cplusplus +} +#endif + +#endif + |