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51 lines
2 KiB
C
51 lines
2 KiB
C
#ifndef MY_DECIMAL_LIMITS_INCLUDED
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#define MY_DECIMAL_LIMITS_INCLUDED
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/* Copyright (c) 2011 Monty Program 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; 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 02110-1335 USA */
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#define DECIMAL_LONGLONG_DIGITS 22
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#define DECIMAL_LONG_DIGITS 10
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#define DECIMAL_LONG3_DIGITS 8
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/** maximum length of buffer in our big digits (uint32). */
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#define DECIMAL_BUFF_LENGTH 9
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/* the number of digits that my_decimal can possibly contain */
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#define DECIMAL_MAX_POSSIBLE_PRECISION (DECIMAL_BUFF_LENGTH * 9)
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/**
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maximum guaranteed precision of number in decimal digits (number of our
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digits * number of decimal digits in one our big digit - number of decimal
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digits in one our big digit decreased by 1 (because we always put decimal
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point on the border of our big digits))
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With normal precision we can handle 65 digits. MariaDB can store in
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the .frm up to 63 digits. By default we use DECIMAL_NOT_SPECIFIED digits
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when converting strings to decimal, so we don't want to set this too high.
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To not use up all digits for the scale we limit the number of decimals to
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38.
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*/
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#define DECIMAL_MAX_PRECISION (DECIMAL_MAX_POSSIBLE_PRECISION - 8*2)
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#define DECIMAL_MAX_SCALE 38
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#define DECIMAL_NOT_SPECIFIED 39
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/**
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maximum length of string representation (number of maximum decimal
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digits + 1 position for sign + 1 position for decimal point, no terminator)
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*/
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#define DECIMAL_MAX_STR_LENGTH (DECIMAL_MAX_POSSIBLE_PRECISION + 2)
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#endif /* MY_DECIMAL_LIMITS_INCLUDED */
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