Add "al_get_joystick_device_id" to api

Author: MarkOates

docs/src/refman/joystick.txt

@@ -131,6 +131,10 @@ handles may become inactive, and vice versa.
 
 See also: [al_reconfigure_joysticks]
 
+## API: al_get_joystick_device_id
+
+Return the device id of the given joystick.
+
 ## API: al_get_joystick_name
 
 Return the name of the given joystick.

include/allegro5/joystick.h

@@ -81,6 +81,7 @@ AL_FUNC(int,            al_get_joystick_num_buttons,  (ALLEGRO_JOYSTICK *));
 AL_FUNC(const char*,    al_get_joystick_button_name,  (ALLEGRO_JOYSTICK *, int buttonn));
 
 AL_FUNC(void,           al_get_joystick_state,  (ALLEGRO_JOYSTICK *, ALLEGRO_JOYSTICK_STATE *ret_state));
+AL_FUNC(int,            al_get_joystick_device_id,  (ALLEGRO_JOYSTICK *));
 
 AL_FUNC(ALLEGRO_EVENT_SOURCE *, al_get_joystick_event_source, (void));
 

src/joynu.c

@@ -300,6 +300,19 @@ void al_get_joystick_state(ALLEGRO_JOYSTICK *joy, ALLEGRO_JOYSTICK_STATE *ret_st
    new_joystick_driver->get_joystick_state(joy, ret_state);
 }
 
+
+
+/* Function: al_get_joystick_device_id
+ */
+int al_get_joystick_device_id(ALLEGRO_JOYSTICK *joy)
+{
+   ASSERT(new_joystick_driver);
+
+   return new_joystick_driver->get_device_id(joy);
+}
+
+
+
 /*
  * Local Variables:
  * c-basic-offset: 3