greenplumn shortest_dec 源码
greenplumn shortest_dec 代码
文件路径：/src/include/common/shortest_dec.h
/*---------------------------------------------------------------------------
*
* Ryu floating-point output.
*
* Portions Copyright (c) 2018-2019, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/include/common/shortest_dec.h
*
* This is a modification of code taken from github.com/ulfjack/ryu under the
* terms of the Boost license (not the Apache license). The original copyright
* notice follows:
*
* Copyright 2018 Ulf Adams
*
* The contents of this file may be used under the terms of the Apache
* License, Version 2.0.
*
* (See accompanying file LICENSE-Apache or copy at
* http://www.apache.org/licenses/LICENSE-2.0)
*
* Alternatively, the contents of this file may be used under the terms of the
* Boost Software License, Version 1.0.
*
* (See accompanying file LICENSE-Boost or copy at
* https://www.boost.org/LICENSE_1_0.txt)
*
* Unless required by applicable law or agreed to in writing, this software is
* distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.
*
*---------------------------------------------------------------------------
*/
#ifndef SHORTEST_DEC_H
#define SHORTEST_DEC_H
/*----
* The length of 25 comes from:
*
* Case 1: -9.9999999999999999e-299 = 24 bytes, plus 1 for null
*
* Case 2: -0.00099999999999999999 = 23 bytes, plus 1 for null
*/
#define DOUBLE_SHORTEST_DECIMAL_LEN 25
int double_to_shortest_decimal_bufn(double f, char *result);
int double_to_shortest_decimal_buf(double f, char *result);
char *double_to_shortest_decimal(double f);
/*
* The length of 16 comes from:
*
* Case 1: -9.99999999e+29 = 15 bytes, plus 1 for null
*
* Case 2: -0.000999999999 = 15 bytes, plus 1 for null
*/
#define FLOAT_SHORTEST_DECIMAL_LEN 16
int float_to_shortest_decimal_bufn(float f, char *result);
int float_to_shortest_decimal_buf(float f, char *result);
char *float_to_shortest_decimal(float f);
#endif /* SHORTEST_DEC_H */
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