Add OpenString to FScanner class

src/p_udmf.cpp

@@ -1061,7 +1061,7 @@ public:
 		if (tagstring.IsNotEmpty())
 		{
 			FScanner sc;
-			sc.OpenMem("tagstring", tagstring.GetChars(), tagstring.Len());
+			sc.OpenString("tagstring", tagstring);
 			// scan the string as long as valid numbers can be found
 			while (sc.CheckNumber())
 			{
@@ -1536,7 +1536,7 @@ public:
 		if (tagstring.IsNotEmpty())
 		{
 			FScanner sc;
-			sc.OpenMem("tagstring", tagstring.GetChars(), tagstring.Len());
+			sc.OpenString("tagstring", tagstring);
 			// scan the string as long as valid numbers can be found
 			while (sc.CheckNumber())
 			{

src/sc_man.cpp

@@ -195,9 +195,22 @@ void FScanner::OpenFile (const char *name)
 //==========================================================================
 
 void FScanner::OpenMem (const char *name, const char *buffer, int size)
+{
+	OpenString(name, FString(buffer, size));
+}
+
+//==========================================================================
+//
+// FScanner :: OpenString
+//
+// Like OpenMem, but takes a string directly.
+//
+//==========================================================================
+
+void FScanner::OpenString (const char *name, FString buffer)
 {
 	Close ();
-	ScriptBuffer = FString(buffer, size);
+	ScriptBuffer = buffer;
 	ScriptName = name;
 	LumpNum = -1;
 	PrepareScript ();

src/sc_man.h

@@ -21,6 +21,7 @@ public:
 	void Open(const char *lumpname);
 	void OpenFile(const char *filename);
 	void OpenMem(const char *name, const char *buffer, int size);
+	void OpenString(const char *name, FString buffer);
 	void OpenLumpNum(int lump);
 	void Close();