\"      $NetBSD: curses_addch.3,v 1.11 2025/04/11 23:57:20 uwe Exp $
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\"      Brett Lymn ([email protected], [email protected])
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Dd October 25, 2018
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
Va stdscr
or to the specified window.
Pp
The
Fn addch
function adds the character given in
Fa ch
to
Va 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
Va 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_insch 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 .

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