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al_ustr_prev(3)                                                al_ustr_prev(3)

NAME
       al_ustr_prev - Allegro 5 API

SYNOPSIS

              #include <allegro5/allegro.h>

              bool al_ustr_prev(const ALLEGRO_USTR *us, int *pos)

DESCRIPTION
       Find the byte offset of the previous code point in string, before *pos.
       *pos does not have to be at the beginning of a code point.  Returns
       true on success, then 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, then *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.

SEE ALSO
       al_ustr_next(3)

Allegro reference manual                                       al_ustr_prev(3)