1 /* Copyright © 2018, Keith Packard 2 All rights reserved. 3 4 Redistribution and use in source and binary forms, with or without 5 modification, are permitted provided that the following conditions are met: 6 7 * Redistributions of source code must retain the above copyright 8 notice, this list of conditions and the following disclaimer. 9 * Redistributions in binary form must reproduce the above copyright 10 notice, this list of conditions and the following disclaimer in 11 the documentation and/or other materials provided with the 12 distribution. 13 * Neither the name of the copyright holders nor the names of 14 contributors may be used to endorse or promote products derived 15 from this software without specific prior written permission. 16 17 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 18 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 21 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 POSSIBILITY OF SUCH DAMAGE. */ 28 29 #ifndef _LDTOA_ENGINE_H_ 30 #define _LDTOA_ENGINE_H_ 31 32 #include <stdlib.h> 33 #include <stdint.h> 34 #include <float.h> 35 #include <stdbool.h> 36 37 #if __LDBL_MANT_DIG__ == 113 38 #define LDTOA_MAX_DIG 34 39 #elif __LDBL_MANT_DIG__ == 106 40 #define LDTOA_MAX_DIG 32 41 #elif __LDBL_MANT_DIG__ == 64 42 #define LDTOA_MAX_DIG 20 43 #endif 44 45 struct ldtoa { 46 int32_t exp; 47 uint8_t flags; 48 char digits[LDTOA_MAX_DIG + 1]; 49 }; 50 51 int 52 __ldtoa_engine(long double x, struct ldtoa *dtoa, int max_digits, bool fmode, int max_decimals); 53 54 /* '__ldtoa_engine' flags return value */ 55 #define LDTOA_MINUS 1 56 #define LDTOA_ZERO 2 57 #define LDTOA_INF 4 58 #define LDTOA_NAN 8 59 #define LDTOA_CARRY 16 /* Carry was to most significant position. */ 60 61 #endif /* !_LDTOA_ENGINE_H_ */ 62
