Remove ostream from class StreamBuffer

luprex/cpp/core/drivenengine.cpp

@@ -62,6 +62,39 @@ static DrivenEngine *make_engine(std::string_view kind) {
     return nullptr;
 }
 
+//////////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////////
+//
+// The stdostream
+//
+//////////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////////
+
+class StreamBufferWriter : public std::streambuf, public eng::opnew {
+private:
+    StreamBuffer *target_;
+public:
+    StreamBufferWriter(StreamBuffer *t) : target_(t) {}
+
+    virtual int_type overflow(int_type c) {
+    	if (c != EOF) {
+            target_->write_uint8(c);
+	    }
+        return c;
+    }
+};
+
+class StreamBufferOStream : public std::ostream, public eng::opnew {
+private:
+    StreamBufferWriter writer_;
+public:
+    StreamBufferOStream(StreamBuffer *t) : std::ostream(nullptr), writer_(t) {
+        rdbuf(&writer_);
+    }
+    virtual ~StreamBufferOStream() {
+    }
+};
+
 //////////////////////////////////////////////////////////////////////////////
 //////////////////////////////////////////////////////////////////////////////
 //
@@ -156,6 +189,7 @@ void DrivenEngine::stop_driver() {
 DrivenEngine::DrivenEngine() {
     next_unused_chid_ = 1;
     stdio_channel_ = eng::make_shared<Channel>(this, 0, 0, "", false);
+    stdostream_.reset(new StreamBufferOStream(stdio_channel_->out()));
     channels_[0] = stdio_channel_;
     rescan_lua_source_ = false;
     clock_ = 0.0;