more print format constants defined; function printNumber(..) adapted.

- HEX2, HEX4, HEX8
- BIN2, BIN4, BIN8, BIN16, BIN32
The number represents the minimum digit count for printing, i.e. adding leading zeros.

Author: TobiasKnauss

api/Print.cpp

@@ -238,22 +238,36 @@ size_t Print::println(const Printable& x)
 
 // Private Methods /////////////////////////////////////////////////////////////
 
-size_t Print::printNumber(unsigned long n, uint8_t base)
+size_t Print::printNumber(unsigned long n, uint16_t base)
 {
   char buf[8 * sizeof(long) + 1]; // Assumes 8-bit chars plus zero byte.
   char *str = &buf[sizeof(buf) - 1];
 
   *str = '\0';
 
+  uint8_t minDigits = 1;
+  uint8_t maxDigits = sizeof(buf) - 1;
+  if (base > 0xFF)
+  {
+    minDigits = base >> 8;
+    base = base & 0xFF;
+  }
+  if (minDigits > maxDigits) minDigits = maxDigits;
+
   // prevent crash if called with base == 1
   if (base < 2) base = 10;
 
+  uint8_t usedDigits = 0;
   do {
     char c = n % base;
     n /= base;
 
     *--str = c < 10 ? c + '0' : c + 'A' - 10;
+    usedDigits++;
   } while(n);
+  while (usedDigits++ < minDigits) {
+    *--str = '0';
+  }
 
   return write(str);
 }

api/Print.h

@@ -26,17 +26,25 @@
 #include "Printable.h"
 
 #define DEC 10
-#define HEX 16
+#define HEX  0x0010
+#define HEX2 0x0210
+#define HEX4 0x0410
+#define HEX8 0x0810
 #define OCT 8
-#define BIN 2
+#define BIN   0x0002
+#define BIN2  0x0202
+#define BIN4  0x0402
+#define BIN8  0x0802
+#define BIN16 0x1002
+#define BIN32 0x2002
 
 namespace arduino {
 
 class Print
 {
   private:
     int write_error;
-    size_t printNumber(unsigned long, uint8_t);
+    size_t printNumber(unsigned long, uint16_t);
     size_t printULLNumber(unsigned long long, uint8_t);
     size_t printFloat(double, int);
   protected: