al_ustr_next - Allegro 5 API
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#include <allegro5/allegro.h>
bool al_ustr_next(const ALLEGRO_USTR *us, int *pos)
Find the byte offset of the next code point in string, beginning at *pos. *pos
does not have to be at the beginning of a code point.
Returns true on success, and the value pointed to by pos will be
updated to the found offset. Otherwise returns false if *pos was already at
the end of the string, and *pos is unmodified.
This function just looks for an appropriate byte; it
doesn’t check if found offset is the beginning of a valid code point.
If you are working with possibly invalid UTF-8 strings then it could skip
over some invalid bytes.