Added custom implementation of ftoa (issues #266, #267, #269 and #270)

include/ArduinoJson/Polyfills/isInfinity.hpp

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+// Copyright Benoit Blanchon 2014-2016
+// MIT License
+//
+// Arduino JSON library
+// https://github.com/bblanchon/ArduinoJson
+// If you like this project, please add a star!
+
+#pragma once
+
+// If Visual Studo <= 2012
+#if defined(_MSC_VER) && _MSC_VER <= 1700
+#include <float.h>
+#else
+#include <math.h>
+#endif
+
+namespace ArduinoJson {
+namespace Polyfills {
+
+// If Visual Studo <= 2012
+#if defined(_MSC_VER) && _MSC_VER <= 1700
+template <typename T>
+bool isInfinity(T x) {
+  return !_finite(x);
+}
+#else
+template <typename T>
+bool isInfinity(T x) {
+  return isinf(x);
+}
+
+#ifdef __GLIBC__
+template <>
+inline bool isInfinity<double>(double x) {
+  return isinfl(x);
+}
+
+template <>
+inline bool isInfinity<float>(float x) {
+  return isinff(x);
+}
+#endif
+#endif
+}
+}

include/ArduinoJson/Polyfills/isNaN.hpp

@@ -0,0 +1,46 @@
+// Copyright Benoit Blanchon 2014-2016
+// MIT License
+//
+// Arduino JSON library
+// https://github.com/bblanchon/ArduinoJson
+// If you like this project, please add a star!
+
+#pragma once
+
+// If Visual Studo <= 2012
+#if defined(_MSC_VER) && _MSC_VER <= 1700
+#include <float.h>
+#else
+#include <math.h>
+#endif
+
+namespace ArduinoJson {
+namespace Polyfills {
+
+// If Visual Studo <= 2012
+#if defined(_MSC_VER) && _MSC_VER <= 1700
+template <typename T>
+bool isNaN(T x) {
+  return _isnan(x) != 0;
+}
+#else
+template <typename T>
+bool isNaN(T x) {
+  return isnan(x);
+}
+
+#ifdef __GLIBC__
+template <>
+inline bool isNaN<double>(double x) {
+  return isnanl(x);
+}
+
+template <>
+inline bool isNaN<float>(float x) {
+  return isnanf(x);
+}
+#endif
+
+#endif
+}
+}

include/ArduinoJson/Polyfills/normalize.hpp

@@ -0,0 +1,47 @@
+// Copyright Benoit Blanchon 2014-2016
+// MIT License
+//
+// Arduino JSON library
+// https://github.com/bblanchon/ArduinoJson
+// If you like this project, please add a star!
+
+#pragma once
+
+namespace ArduinoJson {
+namespace Polyfills {
+
+#ifdef ARDUINO
+
+// on embedded platform, favor code size over speed
+
+template <typename T>
+short normalize(T& value) {
+  short powersOf10 = 0;
+  while (value && value < 1) {
+    powersOf10--;
+    value *= 10;
+  }
+  while (value > 10) {
+    powersOf10++;
+    value /= 10;
+  }
+  return powersOf10;
+}
+
+#else
+
+// on non-embedded platform, favor speed over code size
+
+template <typename T>
+short normalize(T& value) {
+  if (value == 0.0) return 0;
+
+  short powersOf10 = static_cast<short>(floor(log10(value)));
+  value /= pow(T(10), powersOf10);
+
+  return powersOf10;
+}
+
+#endif
+}
+}