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

include/ArduinoJson/Polyfills/isInfinity.hpp

@@ -0,0 +1,45 @@
+// 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
+}
+}