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+/* 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
+