- Turned on warning level 4 just to see what it would produce: a lot of

warnings. At first, I was going to try and clean them all up. Then I decided
  that was a worthless cause and went about just acting on the ones that
  might actually be helpful:
   C4189 (local variable is initialized but not referenced)
   C4702 (unreachable code)
   C4512 (assignment operator could not be generated)


SVN r420 (trunk)

src/zstring.cpp

@@ -478,7 +478,7 @@ void FString::ToUpper ()
 	size_t max = Len();
 	for (size_t i = 0; i < max; ++i)
 	{
-		Chars[i] = toupper(Chars[i]);
+		Chars[i] = (char)toupper(Chars[i]);
 	}
 	UnlockBuffer();
 }
@@ -489,7 +489,7 @@ void FString::ToLower ()
 	size_t max = Len();
 	for (size_t i = 0; i < max; ++i)
 	{
-		Chars[i] = tolower(Chars[i]);
+		Chars[i] = (char)tolower(Chars[i]);
 	}
 	UnlockBuffer();
 }
@@ -502,11 +502,11 @@ void FString::SwapCase ()
 	{
 		if (isupper(Chars[i]))
 		{
-			Chars[i] = tolower(Chars[i]);
+			Chars[i] = (char)tolower(Chars[i]);
 		}
 		else
 		{
-			Chars[i] = toupper(Chars[i]);
+			Chars[i] = (char)toupper(Chars[i]);
 		}
 	}
 	UnlockBuffer();