Allegro 5 api
#include <allegro5/allegro.h> int al_ustr_rfind_chr(const ALLEGRO_USTR *us, int end_pos, int32_t c)
Search for the encoding of code point c in us backwards from byte offset end_pos (exclusive). Returns the position where it is found or -1 if it is not found.
al_ustr_find_chr(3alleg5)