Using CHANNEL_PRINTS to transfer printbuffers to stdout is now working.

luprex/cpp/core/drivenengine.hpp

@@ -218,7 +218,12 @@ public:
     // DRIVER: this merely sets a flag, which the driver will notice later,
     // causing the driver to update the lua source.
     //
-    void rescan_lua_source(bool b);
+    void rescan_lua_source(bool b) { rescan_lua_source_ = b; }
+
+    // Set the flag to indicate that you have something you want to
+    // print.  This will trigger the driver to access CHANNEL_PRINTS.
+    //
+    void set_have_prints(bool b) { have_prints_ = b; }
 
     // Set the world pointer and the actor ID.
     //
@@ -274,6 +279,7 @@ public:
     bool drv_get_outgoing_empty(uint32_t chid) const;
     void drv_get_console_prompt(uint32_t *len, const char **data) const;
     double drv_get_clock() const;
+    bool drv_get_have_prints() const;
     bool drv_get_rescan_lua_source() const;
     bool drv_get_stop_driver() const;
     int64_t drv_get_actor_id() const;
@@ -310,6 +316,7 @@ private:
     StreamBuffer call_function_retpk_;
     bool rescan_lua_source_;
     double clock_;
+    bool have_prints_;
     bool stop_driver_;
     eng::string console_prompt_;
     friend class Channel;