Cumulocity Official / MbedSmartRest

mbed.org implementation of the abstract SmartREST library for the Cumulocity Platform SmartREST protocol.

Dependents:   MbedSmartRestMain MbedSmartRestMain

FloatValue.cpp@13:aba98ad2ac1b, 2014-11-15 (annotated)

Committer:
Cumulocity
Date:
Sat Nov 15 12:21:41 2014 +0100
Revision:
13:aba98ad2ac1b
Parent:
11:e1bee9a77652 
Updated from revision 0b898f0efc6d

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Cumulocity 0:099f76422485 1 /*
Cumulocity 0:099f76422485 2 * FloatValue.cpp
Cumulocity 0:099f76422485 3 *
Cumulocity 0:099f76422485 4 * Created on: Nov 1, 2013
Cumulocity 0:099f76422485 5 * * Authors: Vincent Wochnik <v.wochnik@gmail.com>
Cumulocity 0:099f76422485 6 *
Cumulocity 0:099f76422485 7 * Copyright (c) 2013 Cumulocity GmbH
Cumulocity 0:099f76422485 8 *
Cumulocity 0:099f76422485 9 * Permission is hereby granted, free of charge, to any person obtaining
Cumulocity 0:099f76422485 10 * a copy of this software and associated documentation files (the
Cumulocity 0:099f76422485 11 * "Software"), to deal in the Software without restriction, including
Cumulocity 0:099f76422485 12 * without limitation the rights to use, copy, modify, merge, publish,
Cumulocity 0:099f76422485 13 * distribute, sublicense, and/or sell copies of the Software, and to
Cumulocity 0:099f76422485 14 * permit persons to whom the Software is furnished to do so, subject to
Cumulocity 0:099f76422485 15 * the following conditions:
Cumulocity 0:099f76422485 16 *
Cumulocity 0:099f76422485 17 * The above copyright notice and this permission notice shall be
Cumulocity 0:099f76422485 18 * included in all copies or substantial portions of the Software.
Cumulocity 0:099f76422485 19 *
Cumulocity 0:099f76422485 20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
Cumulocity 0:099f76422485 21 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
Cumulocity 0:099f76422485 22 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
Cumulocity 0:099f76422485 23 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
Cumulocity 0:099f76422485 24 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
Cumulocity 0:099f76422485 25 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
Cumulocity 0:099f76422485 26 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Cumulocity 0:099f76422485 27 */
Cumulocity 0:099f76422485 28
Cumulocity 0:099f76422485 29 #include "FloatValue.h"
Cumulocity 0:099f76422485 30 #include <math.h>
Cumulocity 0:099f76422485 31 #include <stdio.h>
Cumulocity 0:099f76422485 32
Cumulocity 11:e1bee9a77652 33
Cumulocity 11:e1bee9a77652 34 /*-------------------------------------------------------------------------*/
Cumulocity 0:099f76422485 35 FloatValue::FloatValue(double number, uint8_t digits, bool zflag)
Cumulocity 0:099f76422485 36 {
Cumulocity 11:e1bee9a77652 37 _negative = (number < 0.0);
Cumulocity 11:e1bee9a77652 38 _zflag = zflag;
Cumulocity 11:e1bee9a77652 39 if (_negative)
Cumulocity 11:e1bee9a77652 40 _number = -number;
Cumulocity 11:e1bee9a77652 41 else
Cumulocity 11:e1bee9a77652 42 _number = number;
Cumulocity 11:e1bee9a77652 43 if (digits == SMARTREST_FLOATVALUE_DETECTPREC)
Cumulocity 11:e1bee9a77652 44 _digits = detectPrecision(_number);
Cumulocity 11:e1bee9a77652 45 else
Cumulocity 11:e1bee9a77652 46 _digits = digits;
Cumulocity 0:099f76422485 47 }
Cumulocity 11:e1bee9a77652 48 /*-------------------------------------------------------------------------*/
Cumulocity 0:099f76422485 49 uint8_t FloatValue::valueType() const
Cumulocity 0:099f76422485 50 {
Cumulocity 11:e1bee9a77652 51 return VALUE_FLOAT;
Cumulocity 0:099f76422485 52 }
Cumulocity 11:e1bee9a77652 53 /*-------------------------------------------------------------------------*/
Cumulocity 0:099f76422485 54 long FloatValue::integerValue() const
Cumulocity 0:099f76422485 55 {
Cumulocity 11:e1bee9a77652 56 return 0L;
Cumulocity 0:099f76422485 57 }
Cumulocity 11:e1bee9a77652 58 /*-------------------------------------------------------------------------*/
Cumulocity 0:099f76422485 59 double FloatValue::floatValue() const
Cumulocity 0:099f76422485 60 {
Cumulocity 11:e1bee9a77652 61 return (_negative) ? -_number : _number;
Cumulocity 0:099f76422485 62 }
Cumulocity 11:e1bee9a77652 63 /*-------------------------------------------------------------------------*/
Cumulocity 0:099f76422485 64 const char * FloatValue::characterValue() const
Cumulocity 0:099f76422485 65 {
Cumulocity 11:e1bee9a77652 66 return 0;
Cumulocity 0:099f76422485 67 }
Cumulocity 11:e1bee9a77652 68 /*-------------------------------------------------------------------------*/
Cumulocity 0:099f76422485 69 size_t FloatValue::write(AbstractDataSink& sink) const
Cumulocity 0:099f76422485 70 {
Cumulocity 11:e1bee9a77652 71 size_t n = 0;
Cumulocity 11:e1bee9a77652 72 double number, rounding;
Cumulocity 11:e1bee9a77652 73 uint8_t i;
Cumulocity 11:e1bee9a77652 74 unsigned long int_part;
Cumulocity 11:e1bee9a77652 75 double remainder;
Cumulocity 11:e1bee9a77652 76
Cumulocity 11:e1bee9a77652 77 if (isnan(_number))
Cumulocity 11:e1bee9a77652 78 return sink.write("nan");
Cumulocity 0:099f76422485 79
Cumulocity 11:e1bee9a77652 80 if (_negative)
Cumulocity 11:e1bee9a77652 81 n += sink.write('-');
Cumulocity 0:099f76422485 82
Cumulocity 11:e1bee9a77652 83 if (isinf(_number))
Cumulocity 11:e1bee9a77652 84 {
Cumulocity 11:e1bee9a77652 85 n += sink.write("inf");
Cumulocity 11:e1bee9a77652 86 return n;
Cumulocity 11:e1bee9a77652 87 }
Cumulocity 0:099f76422485 88
Cumulocity 11:e1bee9a77652 89 number = _number;
Cumulocity 11:e1bee9a77652 90 rounding = 0.5;
Cumulocity 11:e1bee9a77652 91 for (i = 0; i < _digits; ++i)
Cumulocity 11:e1bee9a77652 92 rounding /= 10.0;
Cumulocity 11:e1bee9a77652 93 number += rounding;
Cumulocity 0:099f76422485 94
Cumulocity 11:e1bee9a77652 95 int_part = (unsigned long)number;
Cumulocity 11:e1bee9a77652 96 remainder = number - (double)int_part;
Cumulocity 0:099f76422485 97
Cumulocity 11:e1bee9a77652 98 if ((_zflag) || (int_part))
Cumulocity 11:e1bee9a77652 99 n += sink.write(int_part);
Cumulocity 0:099f76422485 100
Cumulocity 11:e1bee9a77652 101 if (_digits == 0)
Cumulocity 11:e1bee9a77652 102 return n;
Cumulocity 11:e1bee9a77652 103 n += sink.write(".");
Cumulocity 0:099f76422485 104
Cumulocity 11:e1bee9a77652 105 uint8_t digits = _digits;
Cumulocity 11:e1bee9a77652 106 while (digits-- > 0)
Cumulocity 11:e1bee9a77652 107 {
Cumulocity 11:e1bee9a77652 108 remainder *= 10.0;
Cumulocity 11:e1bee9a77652 109 unsigned long l = (unsigned long)remainder;
Cumulocity 11:e1bee9a77652 110 n += sink.write(l);
Cumulocity 11:e1bee9a77652 111 remainder -= l;
Cumulocity 11:e1bee9a77652 112 }
Cumulocity 0:099f76422485 113
Cumulocity 11:e1bee9a77652 114 return n;
Cumulocity 0:099f76422485 115 }
Cumulocity 11:e1bee9a77652 116 /*-------------------------------------------------------------------------*/
Cumulocity 0:099f76422485 117 size_t FloatValue::length() const
Cumulocity 0:099f76422485 118 {
Cumulocity 11:e1bee9a77652 119 size_t l = 0;
Cumulocity 11:e1bee9a77652 120 double number, rounding;
Cumulocity 11:e1bee9a77652 121 unsigned long n;
Cumulocity 11:e1bee9a77652 122 uint8_t i;
Cumulocity 0:099f76422485 123
Cumulocity 11:e1bee9a77652 124 if (isnan(_number))
Cumulocity 11:e1bee9a77652 125 return 3;
Cumulocity 0:099f76422485 126
Cumulocity 11:e1bee9a77652 127 if (_negative)
Cumulocity 11:e1bee9a77652 128 l++;
Cumulocity 0:099f76422485 129
Cumulocity 11:e1bee9a77652 130 if (isinf(_number))
Cumulocity 11:e1bee9a77652 131 {
Cumulocity 11:e1bee9a77652 132 l += 3;
Cumulocity 11:e1bee9a77652 133 return l;
Cumulocity 11:e1bee9a77652 134 }
Cumulocity 0:099f76422485 135
Cumulocity 11:e1bee9a77652 136 number = _number;
Cumulocity 11:e1bee9a77652 137 rounding = 0.5;
Cumulocity 11:e1bee9a77652 138 for (i = 0; i < _digits; ++i)
Cumulocity 11:e1bee9a77652 139 rounding /= 10.0;
Cumulocity 11:e1bee9a77652 140 number += rounding;
Cumulocity 0:099f76422485 141
Cumulocity 11:e1bee9a77652 142 n = (unsigned long)number;
Cumulocity 11:e1bee9a77652 143 if ((_zflag) || (n))
Cumulocity 11:e1bee9a77652 144 {
Cumulocity 11:e1bee9a77652 145 do
Cumulocity 11:e1bee9a77652 146 {
Cumulocity 11:e1bee9a77652 147 n /= 10;
Cumulocity 11:e1bee9a77652 148 l++;
Cumulocity 11:e1bee9a77652 149 } while(n);
Cumulocity 11:e1bee9a77652 150 }
Cumulocity 0:099f76422485 151
Cumulocity 11:e1bee9a77652 152 if (_digits > 0)
Cumulocity 11:e1bee9a77652 153 l += 1 + _digits;
Cumulocity 0:099f76422485 154
Cumulocity 11:e1bee9a77652 155 return l;
Cumulocity 0:099f76422485 156 }
Cumulocity 11:e1bee9a77652 157 /*-------------------------------------------------------------------------*/
Cumulocity 0:099f76422485 158 Value* FloatValue::copy() const
Cumulocity 0:099f76422485 159 {
Cumulocity 11:e1bee9a77652 160 double number;
Cumulocity 0:099f76422485 161
Cumulocity 11:e1bee9a77652 162 number = (_negative) ? -_number : _number;
Cumulocity 11:e1bee9a77652 163 return new FloatValue(number, _digits, _zflag);
Cumulocity 0:099f76422485 164 }
Cumulocity 11:e1bee9a77652 165 /*-------------------------------------------------------------------------*/
Cumulocity 0:099f76422485 166 uint8_t FloatValue::detectPrecision(double n)
Cumulocity 0:099f76422485 167 {
Cumulocity 11:e1bee9a77652 168 uint8_t prec = 0, count = 0;
Cumulocity 11:e1bee9a77652 169 int8_t d;
Cumulocity 0:099f76422485 170
Cumulocity 11:e1bee9a77652 171 if ((isinf(n)) || (isnan(n)))
Cumulocity 11:e1bee9a77652 172 return 0;
Cumulocity 0:099f76422485 173
Cumulocity 11:e1bee9a77652 174 n -= (long)n;
Cumulocity 0:099f76422485 175
Cumulocity 11:e1bee9a77652 176 while ((prec < 6) && (count < 3))
Cumulocity 11:e1bee9a77652 177 {
Cumulocity 11:e1bee9a77652 178 n *= 10;
Cumulocity 11:e1bee9a77652 179 d = (uint8_t)n;
Cumulocity 0:099f76422485 180
Cumulocity 11:e1bee9a77652 181 if (count == 0)
Cumulocity 11:e1bee9a77652 182 {
Cumulocity 11:e1bee9a77652 183 if ((d <= 0) || (d >= 9))
Cumulocity 11:e1bee9a77652 184 count++;
Cumulocity 11:e1bee9a77652 185 }
Cumulocity 11:e1bee9a77652 186 else
Cumulocity 11:e1bee9a77652 187 {
Cumulocity 11:e1bee9a77652 188 count++;
Cumulocity 11:e1bee9a77652 189 }
Cumulocity 11:e1bee9a77652 190 prec++;
Cumulocity 11:e1bee9a77652 191 n -= d;
Cumulocity 11:e1bee9a77652 192 }
Cumulocity 0:099f76422485 193
Cumulocity 11:e1bee9a77652 194 return --prec;
Cumulocity 0:099f76422485 195 }
Cumulocity 11:e1bee9a77652 196 /*-------------------------------------------------------------------------*/