fixed FileStream::unget() with subsequent calls (i.e. UTF-16 encoding)

Author: firewave

simplecpp.cpp

@@ -335,6 +335,7 @@ class simplecpp::TokenList::Stream {
     }
 
     unsigned short bom;
+protected:
     bool isUtf16;
 };
 
@@ -386,7 +387,14 @@ class FileStream : public simplecpp::TokenList::Stream {
         return ch;
     }
     virtual void unget() {
-        ungetc(lastCh, file);
+        if (isUtf16) {
+            // TODO: use ungetc() as well
+            // UTF-16 has subsequent unget() calls
+            fseek(file, -1, SEEK_CUR);
+        }
+        else
+            ungetc(lastCh, file);
+
     }
     virtual bool good() {
         return lastCh != EOF;