.\" $OpenBSD: curs_add_wch.3,v 1.1 2010/09/06 17:26:17 nicm Exp $
.\"***************************************************************************
.\" Copyright (c) 2001-2002,2006 Free Software Foundation, Inc.              *
.\"                                                                          *
.\" Permission is hereby granted, free of charge, to any person obtaining a  *
.\" copy of this software and associated documentation files (the            *
.\" "Software"), to deal in the Software without restriction, including      *
.\" without limitation the rights to use, copy, modify, merge, publish,      *
.\" distribute, distribute with modifications, sublicense, and/or sell       *
.\" copies of the Software, and to permit persons to whom the Software is    *
.\" furnished to do so, subject to the following conditions:                 *
.\"                                                                          *
.\" The above copyright notice and this permission notice shall be included  *
.\" in all copies or substantial portions of the Software.                   *
.\"                                                                          *
.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
.\" IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
.\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
.\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
.\"                                                                          *
.\" Except as contained in this notice, the name(s) of the above copyright   *
.\" holders shall not be used in advertising or otherwise to promote the     *
.\" sale, use or other dealings in this Software without prior written       *
.\" authorization.                                                           *
.\"***************************************************************************
.\"
.\" $Id: curs_add_wch.3,v 1.1 2010/09/06 17:26:17 nicm Exp $
.TH curs_add_wch 3 ""
.SH NAME
\fBadd_wch\fP,
\fBwadd_wch\fP,
\fBmvadd_wch\fP,
\fBmvwadd_wch\fP,
\fBecho_wchar\fP,
\fBwecho_wchar\fP - add a complex character and rendition to a \fBcurses\fR window, then advance the cursor
.SH SYNOPSIS
.PP
\fB#include <curses.h>\fP
.sp
.B "int add_wch( const cchar_t *\fIwch\fB );"
.br
.B "int wadd_wch( WINDOW *\fIwin\fP, const cchar_t *\fIwch\fB );"
.br
.B "int mvadd_wch( int \fIy\fP, int \fIx\fP, const cchar_t *\fIwch\fB );"
.br
.B "int mvwadd_wch( WINDOW *\fIwin\fP, int \fIy\fP, int \fIx\fP, const cchar_t *\fIwch\fB );"
.br
.B "int echo_wchar( const cchar_t *\fIwch\fB );"
.br
.B "int wecho_wchar( WINDOW *\fIwin\fP, const cchar_t *\fIwch\fB );"
.br
.SH DESCRIPTION
.PP
The
\fBadd_wch\fP,
\fBwadd_wch\fP,
\fBmvadd_wch\fP, and
\fBmvwadd_wch\fP
functions put the complex character \fIwch\fP into the given
window at its current position,
which is then advanced.
These functions perform
wrapping and special-character processing as follows:
.TP 5
-
If \fIwch\fP refers to a spacing character,
then any previous character at that location is removed.
A new character specified by \fIwch\fP is
placed at that location with rendition specified by \fIwch\fP.
The cursor then advances to
the next spacing character on the screen.
.TP 5
-
If \fIwch\fP refers to a non-spacing character,
all previous characters at that location are preserved.
The non-spacing characters of \fIwch\fP
are added to the spacing complex character,
and the rendition specified by \fIwch\fP is ignored.
.TP 5
-
If the character part of \fIwch\fP is
a tab, newline, backspace or other control character,
the window is updated and the cursor moves as if \fBaddch\fR were called.
.PP
The \fBecho_wchar\fP
function is functionally equivalent to a call to
\fBadd_wch\fP
followed by a call to
\fBrefresh\fP.
Similarly, the
\fBwecho_wchar\fP
is functionally equivalent to a call to
\fBwadd_wch\fP
followed by a call to
\fBwrefresh\fP.
The knowledge
that only a single character is being output is taken into consideration and,
for non-control characters, a considerable performance gain might be seen
by using the *\fBecho\fP* functions instead of their equivalents.
.SH RETURN VALUES
.PP
All routines return the integer \fBERR\fR upon failure and \fBOK\fR on success.
.SH NOTES
.PP
Note that
\fBadd_wch\fP,
\fBmvadd_wch\fP,
\fBmvwadd_wch\fP, and
\fBecho_wchar\fP
may be macros.
.SH PORTABILITY
.PP
All these functions are described in the XSI Curses standard, Issue 4.
The defaults specified for forms-drawing characters apply in the POSIX locale.
.PP
XSI documents constants beginning with \fBWACS_\fP which are used for
line-drawing.
Those are not currently implemented in \fBncurses\fP.
.SH SEE ALSO
.PP
\fBcurses\fR(3),
\fBcurs_addch\fR(3),
\fBcurs_attr\fR(3),
\fBcurs_clear\fR(3),
\fBcurs_outopts\fR(3),
\fBcurs_refresh\fR(3),
\fBputwc\fR(3)
.\"#
.\"# The following sets edit modes for GNU EMACS
.\"# Local Variables:
.\"# mode:nroff
.\"# fill-column:79
.\"# End: