al_ustr_prev_get(3)        Library Functions Manual        al_ustr_prev_get(3)

NAME
       al_ustr_prev_get - Allegro 5 API

SYNOPSIS
              #include <allegro5/allegro.h>

              int32_t al_ustr_prev_get(const ALLEGRO_USTR *us, int *pos)

DESCRIPTION
       Find the beginning of a code point before byte offset *pos, then return
       it.  Note this performs a pre-increment.

       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.  As with al_ustr_prev(3), invalid
       byte sequences may be skipped while advancing.

SEE ALSO
       al_ustr_get_next(3)

Allegro reference manual                                   al_ustr_prev_get(3)