Fix some issues with printing float and double

-fixes some issues with printing float and double
-limits the number of decimal places printable to 16

Author: bigdinotech

cores/arduino/Print.cpp

@@ -286,10 +286,23 @@ size_t Print::printLongLong(unsigned long long n, uint8_t base) {
 }
 
 
-size_t Print::printFloat(double number, uint8_t digits)
+size_t Print::printFloat(double number, uint16_t decimalPlaces)
 {
-  char str[50];
-
-  dtostrf(number, 0, digits, str);
+    if(decimalPlaces>16)
+        decimalPlaces = 16;
+    int digits = 0;
+    int intValue = (int)number;
+    while(intValue !=0)
+    {
+        intValue /= 10;
+        digits++;
+    }
+    digits += decimalPlaces;
+    if(number < 0)
+        digits++;
+    char str[digits];
+  
+  
+  dtostrf(number, 0, digits-1, str);
   return(print(str));
 }

cores/arduino/Print.h

@@ -37,7 +37,7 @@ class Print
     int write_error;
     size_t printNumber(unsigned long, uint8_t);
     size_t printLongLong(unsigned long long, uint8_t);
-    size_t printFloat(double, uint8_t);
+    size_t printFloat(double, uint16_t);
   protected:
     void setWriteError(int err = 1) { write_error = err; }
   public:
@@ -67,7 +67,7 @@ class Print
     size_t print(long long, int = DEC);
     size_t print(unsigned long, int = DEC);
     size_t print(unsigned long long, int = DEC);
-    size_t print(double, int = BIN);
+    size_t print(double, int = 2);
     size_t print(const Printable&);
 
     size_t println(const __FlashStringHelper *);
@@ -81,7 +81,7 @@ class Print
     size_t println(long long, int = DEC);
     size_t println(unsigned long, int = DEC);
     size_t println(unsigned long long, int = DEC);
-    size_t println(double, int = BIN);
+    size_t println(double, int = 2);
     size_t println(const Printable&);
     size_t println(void);
 };