al_get_fs_entry_name - Allegro 5 API

       Returns the entry’s filename path.  Note that the filesystem encoding may not be known and the conversion
       to  UTF-8 could in very rare cases cause this to return an invalid path.  Therefore it’s always safest to
       access the file over its ALLEGRO_FS_ENTRY(3alleg5) and not the path.

       On success returns a read only string which you must not modify or destroy.  Returns NULL on failure.

              Note: prior to 5.1.5 it was written: “...  the path will not be an  absolute  path  if  the  entry
              wasn’t created from an absolute path”.  This is no longer true.

Allegro reference manual                                                           al_get_fs_entry_name(3alleg5)

       al_get_fs_entry_name - Allegro 5 API

              #include <allegro5/allegro.h>

              const char *al_get_fs_entry_name(ALLEGRO_FS_ENTRY *e)