al_set_path_drive - Allegro 5 API

       Set  the  drive string on a path.  The drive may be NULL, which is equivalent to setting the drive string
       to the empty string.

       al_set_path_drive - Allegro 5 API

al_get_path_drive(3alleg5)

Allegro reference manual                                                              al_set_path_drive(3alleg5)

              #include <allegro5/allegro.h>

              void al_set_path_drive(ALLEGRO_PATH *path, const char *drive)