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.\" $Id: curs_in_wchstr.3x,v 1.32 2023/11/18 20:55:18 tom Exp $
.TH in_wchstr 3NCURSES 2023-11-18 "ncurses 6.4" "Library calls"
.ie \n(.g \{\
.ds `` \(lq
.ds '' \(rq
.\}
.el \{\
.ie t .ds `` ``
.el   .ds `` ""
.ie t .ds '' ''
.el   .ds '' ""
.\}
.
.de bP
.ie n  .IP \(bu 4
.el    .IP \(bu 2
..
.SH NAME
\fB\%in_wchstr\fP,
\fB\%in_wchnstr\fP,
\fB\%win_wchstr\fP,
\fB\%win_wchnstr\fP,
\fB\%mvin_wchstr\fP,
\fB\%mvin_wchnstr\fP,
\fB\%mvwin_wchstr\fP,
\fB\%mvwin_wchnstr\fP \-
get a \fIcurses\fR complex character string from a window
.SH SYNOPSIS
.nf
\fB#include <curses.h>
.PP
\fBint in_wchstr(cchar_t *\fIwchstr\fP);
\fBint in_wchnstr(cchar_t *\fIwchstr\fP, int \fIn\fP);
\fBint win_wchstr(WINDOW *\fIwin\fP, cchar_t *\fIwchstr\fP);
\fBint win_wchnstr(WINDOW *\fIwin\fP, cchar_t *\fIwchstr\fP, int \fIn\fP);
.PP
\fBint mvin_wchstr(int \fIy\fP, int \fIx\fP, cchar_t *\fIwchstr\fP);
\fBint mvin_wchnstr(int \fIy\fP, int \fIx\fP, cchar_t *\fIwchstr\fP, int \fIn\fP);
\fBint mvwin_wchstr(WINDOW *\fIwin\fP, int \fIy\fP, int \fIx\fP, cchar_t *\fIwchstr\fP);
\fBint mvwin_wchnstr(WINDOW *\fIwin\fP, int \fIy\fP, int \fIx\fP, cchar_t *\fIwchstr\fP, int \fIn\fP);
.fi
.SH DESCRIPTION
These functions return an array of complex characters in \fIwchstr\fP,
starting at the current cursor position in the named window.
Attributes (rendition) are stored with the characters.
.PP
The four functions with \fIn\fP as the last argument return
a leading substring at most \fIn\fP characters long
(exclusive of the trailing zeroed \fBcchar_t\fR.
Transfer stops at the end of the current line, or when \fIn\fP characters have
been stored at the location referenced by \fIwchstr\fP.
.PP
Constants defined in \fB<curses.h>\fP can be used with the \fB&\fP (logical
AND) operator to extract the character or the attribute alone from any position
in the \fIwchstr\fP [see \fB\%getcchar\fP(3NCURSES)].
.SH RETURN VALUE
Upon successful completion, these functions return
\fBOK\fP.
Otherwise, they return
\fBERR\fP.
.PP
X/Open Curses defines no error conditions.
This implementation returns an error
.bP
if the \fIwin\fP parameter is null or
.bP
if the \fIwchstr\fP parameter is null.
.PP
Functions with a \*(``mv\*('' prefix first perform a cursor movement using
\fBwmove\fP, and return an error if the position is outside the window,
or if the window pointer is null.
.SH NOTES
All routines except \fBwin_wchnstr\fP may be macros.
.PP
Reading a line that overflows the array pointed to by
\fIwchstr\fP
with
\fBin_wchstr\fP,
\fBmvin_wchstr\fP,
\fBmvwin_wchstr\fP
or
\fBwin_wchstr\fP
causes undefined results.
Therefore, the use of
\fBin_wchnstr\fP,
\fBmvin_wchnstr\fP,
\fBmvwin_wchnstr\fP, or
\fBwin_wchnstr\fP
is recommended.
.SH PORTABILITY
The XSI Curses defines no error conditions.
This implementation checks for null pointers,
returning \fBERR\fP in that case.
.SH SEE ALSO
\fB\%ncurses\fP(3NCURSES),
\fB\%inchstr\fP(3NCURSES),
\fB\%instr\fP(3NCURSES),
\fB\%inwstr\fP(3NCURSES),
\fB\%in_wch\fP(3NCURSES)