Improved portability of String class (maniacbug)

Author: cmaglie

cores/arduino/WString.cpp

@@ -70,39 +70,39 @@ String::String(char c)
 String::String(unsigned char value, unsigned char base)
 {
 	init();
-	char buf[9];
+	char buf[1 + 8 * sizeof(unsigned char)];
 	utoa(value, buf, base);
 	*this = buf;
 }
 
 String::String(int value, unsigned char base)
 {
 	init();
-	char buf[18];
+	char buf[2 + 8 * sizeof(int)];
 	itoa(value, buf, base);
 	*this = buf;
 }
 
 String::String(unsigned int value, unsigned char base)
 {
 	init();
-	char buf[17];
+	char buf[1 + 8 * sizeof(unsigned int)];
 	utoa(value, buf, base);
 	*this = buf;
 }
 
 String::String(long value, unsigned char base)
 {
 	init();
-	char buf[34];
+	char buf[2 + 8 * sizeof(long)];
 	ltoa(value, buf, base);
 	*this = buf;
 }
 
 String::String(unsigned long value, unsigned char base)
 {
 	init();
-	char buf[33];
+	char buf[1 + 8 * sizeof(unsigned long)];
 	ultoa(value, buf, base);
 	*this = buf;
 }
@@ -289,35 +289,35 @@ unsigned char String::concat(char c)
 
 unsigned char String::concat(unsigned char num)
 {
-	char buf[4];
+	char buf[1 + 3 * sizeof(unsigned char)];
 	itoa(num, buf, 10);
 	return concat(buf, strlen(buf));
 }
 
 unsigned char String::concat(int num)
 {
-	char buf[12];
+	char buf[2 + 3 * sizeof(int)];
 	itoa(num, buf, 10);
 	return concat(buf, strlen(buf));
 }
 
 unsigned char String::concat(unsigned int num)
 {
-	char buf[11];
+	char buf[1 + 3 * sizeof(unsigned int)];
 	utoa(num, buf, 10);
 	return concat(buf, strlen(buf));
 }
 
 unsigned char String::concat(long num)
 {
-	char buf[12];
+	char buf[2 + 3 * sizeof(long)];
 	ltoa(num, buf, 10);
 	return concat(buf, strlen(buf));
 }
 
 unsigned char String::concat(unsigned long num)
 {
-	char buf[11];
+	char buf[1 + 3 * sizeof(unsigned long)];
 	ultoa(num, buf, 10);
 	return concat(buf, strlen(buf));
 }