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.TH "al_ustr_prev" "3alleg5" "" "Allegro reference manual" ""
.hy
.SH NAME
.PP
al_ustr_prev - Allegro 5 API
.SH SYNOPSIS
.IP
.nf
\f[C]
#include <allegro5/allegro.h>

bool al_ustr_prev(const ALLEGRO_USTR *us, int *pos)
\f[R]
.fi
.SH DESCRIPTION
.PP
Find the byte offset of the previous code point in string, before
\f[C]*pos\f[R].
\f[C]*pos\f[R] does not have to be at the beginning of a code point.
Returns true on success, and the value pointed to by \f[C]pos\f[R] will
be updated to the found offset.
Otherwise returns false if \f[C]*pos\f[R] was already at the end of the
string, and \f[C]*pos\f[R] is unmodified.
.PP
This function just looks for an appropriate byte; it doesn\[cq]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.
.SH SEE ALSO
.PP
al_ustr_next(3alleg5)