Add print method for int64_t and uint64_t

See:
https://github.com/arduino/Arduino/issues/1236

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>

Author: fpistm

cores/arduino/Print.cpp

@@ -255,3 +255,56 @@ size_t Print::printFloat(double number, uint8_t digits)
 
   return n;
 }
+
+#ifdef SUPPORT_LONGLONG
+
+void Print::println(int64_t n, uint8_t base)
+{
+  print(n, base);
+  println();
+}
+
+void Print::print(int64_t n, uint8_t base)
+{
+  if (n < 0)
+  {
+    print((char)'-');
+    n = -n;
+  }
+  if (base < 2) base = 2;
+  print((uint64_t)n, base);
+}
+
+void Print::println(uint64_t n, uint8_t base)
+{
+  print(n, base);
+  println();
+}
+
+void Print::print(uint64_t n, uint8_t base)
+{
+  if (base < 2) base = 2;
+  printLLNumber(n, base);
+}
+
+void Print::printLLNumber(uint64_t n, uint8_t base)
+{
+  unsigned char buf[16 * sizeof(long)];
+  unsigned int i = 0;
+
+  if (n == 0)
+  {
+    print((char)'0');
+	return;
+  }
+
+  while (n > 0)
+  {
+    buf[i++] = n % base;
+    n /= base;
+  }
+
+  for (; i > 0; i--)
+    print((char) (buf[i - 1] < 10 ? '0' + buf[i - 1] : 'A' + buf[i - 1] - 10));
+}
+#endif

cores/arduino/Print.h

@@ -31,11 +31,17 @@
 #define OCT 8
 #define BIN 2
 
+// uncomment next line to support printing of 64 bit ints.
+#define SUPPORT_LONGLONG
+
 class Print
 {
   private:
     int write_error;
     size_t printNumber(unsigned long, uint8_t);
+#ifdef SUPPORT_LONGLONG
+    void printLLNumber(uint64_t, uint8_t );
+#endif
     size_t printFloat(double, uint8_t);
   protected:
     void setWriteError(int err = 1) { write_error = err; }
@@ -79,6 +85,12 @@ class Print
     size_t println(double, int = 2);
     size_t println(const Printable&);
     size_t println(void);
+#ifdef SUPPORT_LONGLONG
+    void println(int64_t, uint8_t = DEC);
+    void print(int64_t, uint8_t = DEC);
+    void println(uint64_t, uint8_t = DEC);
+    void print(uint64_t, uint8_t = DEC);
+#endif
 };
 
 #endif