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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[]
.fi
.SH DESCRIPTION
.PP
Find the byte offset of the previous code point in string, before
\f[C]*pos\f[].
\f[C]*pos\f[] 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[] will
be updated to the found offset.
Otherwise returns false if \f[C]*pos\f[] was already at the end of the
string, and \f[C]*pos\f[] is unmodified.
.PP
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.
.SH SEE ALSO
.PP
al_ustr_next(3alleg5)