al_append_native_text_log - Allegro 5 API

       Appends  a  line  of  text  to the message log window and scrolls to the bottom (if the line would not be
       visible otherwise).  This works like printf.  A line is continued until you add a newline character.

       If the window is NULL then this function will fall back to calling printf.  This makes it  convenient  to
       support logging to a window or a terminal.

Allegro reference manual                                                      al_append_native_text_log(3alleg5)

       al_append_native_text_log - Allegro 5 API

              #include <allegro5/allegro_native_dialog.h>

              void al_append_native_text_log(ALLEGRO_TEXTLOG *textlog,
                 char const *format, ...)