forked from bblanchon/ArduinoJson
61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
// Copyright Benoit Blanchon 2014-2016
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// MIT License
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//
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// Arduino JSON library
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// https://github.com/bblanchon/ArduinoJson
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// If you like this project, please add a star!
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#ifndef ARDUINO
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#include "../../include/ArduinoJson/Arduino/Print.hpp"
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#include <stdio.h>
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#include <math.h> // for isnan() and isinf()
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// only for GCC 4.9+
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#if defined(__GNUC__) && \
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(__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 9))
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#pragma GCC diagnostic ignored "-Wfloat-conversion"
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#endif
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// Visual Studo 2012 didn't have isnan, nor isinf
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#if defined(_MSC_VER) && _MSC_VER <= 1700
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#include <float.h>
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#define isnan(x) _isnan(x)
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#define isinf(x) (!_finite(x))
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#endif
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size_t Print::print(const char s[]) {
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size_t n = 0;
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while (*s) {
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n += write(*s++);
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}
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return n;
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}
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size_t Print::print(double value, int digits) {
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// https://github.com/arduino/Arduino/blob/db8cbf24c99dc930b9ccff1a43d018c81f178535/hardware/arduino/sam/cores/arduino/Print.cpp#L218
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if (isnan(value)) return print("nan");
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if (isinf(value)) return print("inf");
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char tmp[32];
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// https://github.com/arduino/Arduino/blob/db8cbf24c99dc930b9ccff1a43d018c81f178535/hardware/arduino/sam/cores/arduino/Print.cpp#L220
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bool isBigDouble = value > 4294967040.0 || value < -4294967040.0;
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if (isBigDouble) {
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// Arduino's implementation prints "ovf"
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// We prefer trying to use scientific notation, since we have sprintf
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sprintf(tmp, "%g", value);
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} else {
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// Here we have the exact same output as Arduino's implementation
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sprintf(tmp, "%.*f", digits, value);
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}
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return print(tmp);
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}
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size_t Print::println() { return write('\r') + write('\n'); }
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#endif
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