refactored printIntegerInBase to work without a buffer + minor cleanup

print.c

@@ -40,25 +40,24 @@ void printPgmString(const char *s)
 		serial_write(c);
 }
 
+// Prints a single digit of any base up to 36. 0..9 prints as
+// '0'..'9' while 10..35 prints as 'a'..'z'
+void printDigit(uint8_t value) {
+	serial_write(value < 10 ?
+		'0' + value :
+		'a' + value - 10);
+}
+
 void printIntegerInBase(unsigned long n, unsigned long base)
 { 
-	unsigned char buf[8 * sizeof(long)]; // Assumes 8-bit chars. 
-	unsigned long i = 0;
-
 	if (n == 0) {
-		serial_write('0');
+    printDigit(0);
 		return;
 	} 
-
 	while (n > 0) {
-		buf[i++] = n % base;
+    printDigit(n % base);
 		n /= base;
 	}
-
-	for (; i > 0; i--)
-		serial_write(buf[i - 1] < 10 ?
-			'0' + buf[i - 1] :
-			'A' + buf[i - 1] - 10);
 }
 
 void printInteger(long n)