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.\" $Id: curs_in_wchstr.3x,v 1.48 2025/02/01 22:54:32 tom Exp $
.TH curs_in_wchstr 3X 2025-02-01 "ncurses 6.5" "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 win_wchstr(WINDOW *\fIwin\fP, cchar_t *\fIwchstr\fP);
\fBint mvin_wchstr(int \fIy\fP, int \fIx\fP, cchar_t *\fIwchstr\fP);
\fBint mvwin_wchstr(WINDOW *\fIwin\fP, int \fIy\fP, int \fIx\fP, cchar_t *\fIwchstr\fP);
.PP
\fBint in_wchnstr(cchar_t *\fIwchstr\fP, int \fIn\fP);
\fBint win_wchnstr(WINDOW *\fIwin\fP, cchar_t *\fIwchstr\fP, int \fIn\fP);
\fBint mvin_wchnstr(int \fIy\fP, int \fIx\fP, cchar_t *\fIwchstr\fP, int \fIn\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 \fBgetcchar\fP(3X)].
.SH RETURN VALUE
Upon successful completion, these functions return
\fBOK\fP.
Otherwise, they return
\fBERR\fP.
.PP
.I \%ncurses
returns
.B ERR
.bP
if the \fIwin\fP parameter is null or
.bP
if the \fIwchstr\fP parameter is null.
.PP
Functions prefixed with \*(``mv\*('' first perform cursor movement and
fail if the position
.RI ( y ,
.IR x )
is outside the window boundaries.
.SH NOTES
All of these functions except
.B \%win_wchnstr
may be implemented as 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
X/Open Curses Issue\ 4 describes these functions.
It specifies no error conditions for them.
.SH HISTORY
X/Open Curses Issue\ 4 (1995) initially specified these functions.
The System\ V Interface Definition Version\ 4
of the same year
specified a function named
.I \%winwchstr
(and the usual variants).
.\" SVID 4, vol 3., p. 515
This was a later addition to
.RI SVr4. x ,
not appearing in the first SVr4 (1989).
It differed from X/Open's later
.I \%win_wchstr
in that it took an argument of type
.RI pointer-to- chtype
instead of
.RI pointer-to cchar_t .
.SH SEE ALSO
\fB\%curs_inchstr\fP(3X) describes comparable functions of the
.I \%ncurses
library in its non-wide-character configuration.
.PP
\fB\%curses\fP(3X),
\fB\%curs_inwstr\fP(3X),
\fB\%curs_in_wch\fP(3X)