138 lines
5.7 KiB
C
138 lines
5.7 KiB
C
/*
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* Copyright (c) 2019, The Linux Foundation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of The Linux Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef STD_DTOA_H
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#define STD_DTOA_H
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//
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// Constant Definitions
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//
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// For floating point numbers, the range of a double precision number is
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// approximately +/- 10 ^ 308.25 as per the IEEE Standard 754.
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// As such, the maximum size of the integer portion of the
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// string is assumed to be 311 (309 + sign + \0). The maximum
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// size of the fractional part is assumed to be 100. Thus, the
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// maximum size of the string that would contain the number
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// after conversion is safely assumed to be 420 (including any
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// prefix, the null character and exponent specifiers 'e').
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//
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// The buffers that contain the converted integer and the fraction parts of
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// the float are safely assumed to be of size 310.
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#define STD_DTOA_FORMAT_FLOAT_SIZE 420
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#define STD_DTOA_FORMAT_INTEGER_SIZE 311
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#define STD_DTOA_FORMAT_FRACTION_SIZE 100
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// Constants for operations on the IEEE 754 representation of double
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// precision floating point numbers.
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#define STD_DTOA_DP_SIGN_SHIFT_COUNT 63
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#define STD_DTOA_DP_EXPONENT_SHIFT_COUNT 52
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#define STD_DTOA_DP_EXPONENT_MASK 0x7ff
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#define STD_DTOA_DP_EXPONENT_BIAS 1023
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#define STD_DTOA_DP_MANTISSA_MASK ( ( (uint64)1 << 52 ) - 1 )
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#define STD_DTOA_DP_INFINITY_EXPONENT_ID 0x7FF
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#define STD_DTOA_DP_MAX_EXPONENT 1023
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#define STD_DTOA_DP_MIN_EXPONENT_NORM -1022
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#define STD_DTOA_DP_MIN_EXPONENT_DENORM -1074
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#define STD_DTOA_DP_MAX_EXPONENT_DEC 308
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#define STD_DTOA_DP_MIN_EXPONENT_DEC_DENORM -323
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#define STD_DTOA_PRECISION_ROUNDING_VALUE 4
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#define STD_DTOA_DEFAULT_FLOAT_PRECISION 6
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#define STD_DTOA_NEGATIVE_INF_UPPER_CASE "-INF"
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#define STD_DTOA_NEGATIVE_INF_LOWER_CASE "-inf"
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#define STD_DTOA_POSITIVE_INF_UPPER_CASE "INF"
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#define STD_DTOA_POSITIVE_INF_LOWER_CASE "inf"
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#define STD_DTOA_NAN_UPPER_CASE "NAN"
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#define STD_DTOA_NAN_LOWER_CASE "nan"
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#define STD_DTOA_FP_POSITIVE_INF 0x7FF0000000000000uLL
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#define STD_DTOA_FP_NEGATIVE_INF 0xFFF0000000000000uLL
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#define STD_DTOA_FP_SNAN 0xFFF0000000000001uLL
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#define STD_DTOA_FP_QNAN 0xFFFFFFFFFFFFFFFFuLL
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//
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// Useful Macros
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//
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#define MY_ISDIGIT(c) ( ( (c) >= '0' ) && ( (c) <= '9' ) )
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#define FP_EXPONENT(u) ( ( ( (u) >> STD_DTOA_DP_EXPONENT_SHIFT_COUNT ) \
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& STD_DTOA_DP_EXPONENT_MASK ) - STD_DTOA_DP_EXPONENT_BIAS )
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#define FP_EXPONENT_BIASED(u) ( ( (u) >> STD_DTOA_DP_EXPONENT_SHIFT_COUNT ) \
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& STD_DTOA_DP_EXPONENT_MASK )
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#define FP_MANTISSA_NORM(u) ( ( (u) & STD_DTOA_DP_MANTISSA_MASK ) | \
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( (uint64)1 << STD_DTOA_DP_EXPONENT_SHIFT_COUNT ) )
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#define FP_MANTISSA_DENORM(u) ( (u) & STD_DTOA_DP_MANTISSA_MASK )
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#define FP_MANTISSA(u) ( FP_EXPONENT_BIASED(u) ? FP_MANTISSA_NORM(u) : \
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FP_MANTISSA_DENORM(u) )
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#define FP_SIGN(u) ( (u) >> STD_DTOA_DP_SIGN_SHIFT_COUNT )
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#define DOUBLE_TO_UINT64(d) ( *( (uint64*) &(d) ) )
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#define DOUBLE_TO_INT64(d) ( *( (int64*) &(d) ) )
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#define UINT64_TO_DOUBLE(u) ( *( (double*) &(u) ) )
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//
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// Type Definitions
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//
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typedef enum
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{
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FP_TYPE_UNKOWN = 0,
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FP_TYPE_NEGATIVE_INF,
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FP_TYPE_POSITIVE_INF,
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FP_TYPE_NAN,
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FP_TYPE_GENERAL,
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} FloatingPointType;
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//
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// Function Declarations
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//
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#ifdef __cplusplus
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extern "C" {
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#endif // #ifdef __cplusplus
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double fp_pow_10( int nPow );
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double fp_round( double dNumber, int nPrecision );
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int fp_log_10( double dNumber );
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int fp_check_special_cases( double dNumber, FloatingPointType* pNumberType );
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int std_dtoa_decimal( double dNumber, int nPrecision,
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char acIntegerPart[ STD_DTOA_FORMAT_INTEGER_SIZE ],
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char acFractionPart[ STD_DTOA_FORMAT_FRACTION_SIZE ] );
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int std_dtoa_hex( double dNumber, int nPrecision, char cFormat,
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char acIntegerPart[ STD_DTOA_FORMAT_INTEGER_SIZE ],
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char acFractionPart[ STD_DTOA_FORMAT_FRACTION_SIZE ],
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int* pnExponent );
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#ifdef __cplusplus
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}
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#endif // #ifdef __cplusplus
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#endif // STD_DTOA_H
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