.\"	$NetBSD: curses_addch.3,v 1.9 2017/07/03 21:32:50 wiz Exp $
.\"
.\" Copyright (c) 2002
.\"	Brett Lymn (blymn@NetBSD.org, brett_lymn@yahoo.com.au)
.\"
.\" This code is donated to the NetBSD Foundation by the Author.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. The name of the Author may not be used to endorse or promote
.\"    products derived from this software without specific prior written
.\"    permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\"
.Dd July 11, 2007
.Dt CURSES_ADDCH 3
.Os
.Sh NAME
.Nm curses_addch ,
.Nm addch ,
.Nm waddch ,
.Nm mvaddch ,
.Nm mvwaddch
.Nd curses add characters to windows routines
.Sh LIBRARY
.Lb libcurses
.Sh SYNOPSIS
.In curses.h
.Ft int
.Fn addch "chtype ch"
.Ft int
.Fn waddch "WINDOW *win" "chtype ch"
.Ft int
.Fn mvaddch "int y" "int x" "chtype ch"
.Ft int
.Fn mvwaddch "WINDOW *win" "int y" "int x" "chtype ch"
.Sh DESCRIPTION
These functions add characters to
.Dv stdscr
or to the specified window.
.Pp
The
.Fn addch
function adds the character given in
.Fa ch
to
.Dv stdscr
at the current cursor position and advances the current cursor position by one.
Any character attributes set in
.Fa ch
will be merged with the background attributes currently set on
.Dv stdscr .
.Pp
The
.Fn waddch
function is the same as the
.Fn addch
function, excepting that the character is added to the window specified by
.Fa win .
.Pp
The
.Fn mvaddch
and
.Fn mvwaddch
functions are the same as the
.Fn addch
and
.Fn waddch
functions, respectively, excepting that
.Fn wmove
is called to move the cursor to the position specified by
.Fa y ,
.Fa x
before the character is added to the window.
.Ss LINE DRAWING CHARACTERS
Some terminals support the display of line drawing and graphics characters.
These characters can be added using their defined names, as shown in the
table below.
Where the terminal does not support a specific character, the default
(non-graphics) character is displayed instead.
.Bl -column -offset indent ".Sy System V Name" ".Sy Default"
.It Sy "Name" Ta Sy "Default" Ta Sy "Description"
.It ACS_RARROW Ta > Ta "Arrow pointing right"
.It ACS_LARROW Ta < Ta "Arrow pointing left"
.It ACS_UARROW Ta ^ Ta "Arrow pointing up"
.It ACS_DARROW Ta v Ta "Arrow pointing down"
.It ACS_BLOCK Ta # Ta "Solid square block"
.It ACS_DIAMOND Ta + Ta "Diamond"
.It ACS_CKBOARD Ta : Ta "Checker board (stipple)"
.It ACS_DEGREE Ta ' Ta "Degree symbol"
.It ACS_PLMINUS Ta # Ta "Plus/minus"
.It ACS_BOARD Ta # Ta "Board of squares"
.It ACS_LANTERN Ta # Ta "Lantern symbol"
.It ACS_LRCORNER Ta + Ta "Lower right-hand corner"
.It ACS_URCORNER Ta + Ta "Upper right-hand corner"
.It ACS_ULCORNER Ta + Ta "Upper left-hand corner"
.It ACS_LLCORNER Ta + Ta "Lower left-hand corner"
.It ACS_PLUS Ta + Ta "Plus"
.It ACS_HLINE Ta - Ta "Horizontal line"
.It ACS_S1 Ta - Ta "Scan line 1"
.It ACS_S9 Ta - Ta "Scan line 9"
.It ACS_LTEE Ta + Ta "Left tee"
.It ACS_RTEE Ta + Ta "Right tee"
.It ACS_BTEE Ta + Ta "Bottom tee"
.It ACS_TTEE Ta + Ta "Top tee"
.It ACS_VLINE Ta | Ta "Vertical line"
.It ACS_BULLET Ta o Ta "Bullet"
.El
.Pp
The following additional,
.Em ncurses
compatible, characters are also supported.
.Bl -column -offset indent ".Sy System V Name" ".Sy Default"
.It Sy "Name" Ta Sy "Default" Ta Sy "Description"
.It ACS_S3 Ta - Ta "Scan line 3"
.It ACS_S7 Ta - Ta "Scan line 7"
.It ACS_LEQUAL Ta < Ta "Less than or equal to"
.It ACS_GEQUAL Ta > Ta "Greater than or equal to"
.It ACS_PI Ta * Ta "Pi symbol"
.It ACS_NEQUAL Ta ! Ta "Not equal to"
.It ACS_STERLING Ta f Ta "Sterling symbol"
.El
.Pp
For compatibility with some
.Em System V
implementations, the following definitions are also supported.
.Bl -column -offset indent ".Sy System V Name" ".Sy Default"
.It Sy "System V Name" Ta Sy "NetBSD Curses Name"
.It ACS_SBBS Ta ACS_LRCORNER
.It ACS_BBSS Ta ACS_URCORNER
.It ACS_BSSB Ta ACS_ULCORNER
.It ACS_SSBB Ta ACS_LLCORNER
.It ACS_SSSS Ta ACS_PLUS
.It ACS_BSBS Ta ACS_HLINE
.It ACS_SSSB Ta ACS_LTEE
.It ACS_SBSS Ta ACS_RTEE
.It ACS_SSBS Ta ACS_BTEE
.It ACS_BSSS Ta ACS_TTEE
.It ACS_SBSB Ta ACS_VLINE
.El
.Sh RETURN VALUES
Functions returning pointers will return
.Dv NULL
if an error is detected.
The functions that return an int will return one of the following
values:
.Pp
.Bl -tag -width ERR -compact
.It Er OK
The function completed successfully.
.It Er ERR
An error occurred in the function.
.El
.Sh SEE ALSO
.Xr curses_addchstr 3 ,
.Xr curses_addstr 3 ,
.Xr curses_attributes 3 ,
.Xr curses_cursor 3 ,
.Xr curses_delch 3 ,
.Xr curses_inch 3 ,
.Xr curses_insertch 3
.Sh STANDARDS
The
.Nx
Curses library complies with the X/Open Curses specification, part of the
Single Unix Specification.
.Sh HISTORY
The Curses package appeared in
.Bx 4.0 .