1 /*--------------------------------------------------------------------------- 2 * 3 * Ryu floating-point output. 4 * 5 * Portions Copyright (c) 2018-2019, PostgreSQL Global Development Group 6 * 7 * IDENTIFICATION 8 * src/include/common/shortest_dec.h 9 * 10 * This is a modification of code taken from github.com/ulfjack/ryu under the 11 * terms of the Boost license (not the Apache license). The original copyright 12 * notice follows: 13 * 14 * Copyright 2018 Ulf Adams 15 * 16 * The contents of this file may be used under the terms of the Apache 17 * License, Version 2.0. 18 * 19 * (See accompanying file LICENSE-Apache or copy at 20 * http://www.apache.org/licenses/LICENSE-2.0) 21 * 22 * Alternatively, the contents of this file may be used under the terms of the 23 * Boost Software License, Version 1.0. 24 * 25 * (See accompanying file LICENSE-Boost or copy at 26 * https://www.boost.org/LICENSE_1_0.txt) 27 * 28 * Unless required by applicable law or agreed to in writing, this software is 29 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 30 * KIND, either express or implied. 31 * 32 *--------------------------------------------------------------------------- 33 */ 34 #ifndef SHORTEST_DEC_H 35 #define SHORTEST_DEC_H 36 37 /*---- 38 * The length of 25 comes from: 39 * 40 * Case 1: -9.9999999999999999e-299 = 24 bytes, plus 1 for null 41 * 42 * Case 2: -0.00099999999999999999 = 23 bytes, plus 1 for null 43 */ 44 #define DOUBLE_SHORTEST_DECIMAL_LEN 25 45 46 int double_to_shortest_decimal_bufn(double f, char *result); 47 int double_to_shortest_decimal_buf(double f, char *result); 48 char *double_to_shortest_decimal(double f); 49 50 /* 51 * The length of 16 comes from: 52 * 53 * Case 1: -9.99999999e+29 = 15 bytes, plus 1 for null 54 * 55 * Case 2: -0.000999999999 = 15 bytes, plus 1 for null 56 */ 57 #define FLOAT_SHORTEST_DECIMAL_LEN 16 58 59 int float_to_shortest_decimal_bufn(float f, char *result); 60 int float_to_shortest_decimal_buf(float f, char *result); 61 char *float_to_shortest_decimal(float f); 62 63 #endif /* SHORTEST_DEC_H */ 64