ALLEGRO_USTR_INFO - Allegro 5 API

       A  type that holds additional information for an ALLEGRO_USTR(3alleg5) that references an external memory
       buffer.  You can convert it back to ALLEGRO_USTR(3alleg5) via al_ref_info(3alleg5).

       ALLEGRO_USTR_INFO - Allegro 5 API

al_ref_cstr(3alleg5), al_ref_buffer(3alleg5), al_ref_info(3alleg5) and al_ref_ustr(3alleg5).

Allegro reference manual                                                              ALLEGRO_USTR_INFO(3alleg5)

              #include <allegro5/allegro.h>

              typedef struct _al_tagbstring ALLEGRO_USTR_INFO;