al_ustr_get - Allegro 5 API

       Return the code point in ub beginning at byte offset pos.

       On  success  returns  the  code point value.  If pos was out of bounds (e.g. past the end of the string),
       return -1.  On an error, such as an invalid byte sequence, return -2.

       al_ustr_get - Allegro 5 API

al_ustr_get_next(3alleg5), al_ustr_prev_get(3alleg5)

Allegro reference manual                                                                    al_ustr_get(3alleg5)

              #include <allegro5/allegro.h>

              int32_t al_ustr_get(const ALLEGRO_USTR *ub, int pos)