al_ustr_prev_get - Man Page

#include <allegro5/allegro.h>

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

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.

al_ustr_get_next(3)

al_ustr_get(3), al_ustr_get_next(3).