Fixed "constant exceeds range of float [-Woverflow]" (issue #544)

test/Polyfills/CMakeLists.txt

@@ -8,6 +8,7 @@
 add_executable(PolyfillsTests 
 	isFloat.cpp
 	isInteger.cpp
+	normalize.cpp
 	parseFloat.cpp
 	parseInteger.cpp
 )

test/Polyfills/normalize.cpp

@@ -0,0 +1,43 @@
+// Copyright Benoit Blanchon 2014-2017
+// MIT License
+//
+// Arduino JSON library
+// https://bblanchon.github.io/ArduinoJson/
+// If you like this project, please add a star!
+
+#include <ArduinoJson/Polyfills/normalize.hpp>
+#include <catch.hpp>
+
+using namespace ArduinoJson::Polyfills;
+
+TEST_CASE("normalize<double>()") {
+  SECTION("1.7976931348623157E+308") {
+    double value = 1.7976931348623157E+308;
+    int exp = normalize(value);
+    REQUIRE(value == Approx(1.7976931348623157));
+    REQUIRE(exp == 308);
+  }
+
+  SECTION("4.94065645841247e-324") {
+    double value = 4.94065645841247e-324;
+    int exp = normalize(value);
+    REQUIRE(value == Approx(4.94065645841247));
+    REQUIRE(exp == -324);
+  }
+}
+
+TEST_CASE("normalize<float>()") {
+  SECTION("3.4E+38") {
+    float value = 3.4E+38f;
+    int exp = normalize(value);
+    REQUIRE(value == Approx(3.4f));
+    REQUIRE(exp == 38);
+  }
+
+  SECTION("1.17549435e−38") {
+    float value = 1.17549435e-38f;
+    int exp = normalize(value);
+    REQUIRE(value == Approx(1.17549435));
+    REQUIRE(exp == -38);
+  }
+}