.\"	$NetBSD: curses_attributes.3,v 1.2 2002/10/21 14:17:54 wiz Exp $
.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
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.\" by Julian Coleman.
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.Dd October 13, 2002
.Dt CURSES_ATTRIBUTES 3
.Os
.Sh NAME
.Nm curses_attributes ,
.Nm attron ,
.Nm attroff ,
.Nm attrset ,
.Nm wattron ,
.Nm wattroff ,
.Nm wattrset ,
.Nm getattrs
.Nd curses general attribute manipulation routines
.Sh LIBRARY
.Lb libcurses
.Sh SYNOPSIS
.Fd #include \*[Lt]curses.h\*[Gt]
.Ft int
.Fn attron int
.Ft int
.Fn attroff int
.Ft int
.Fn attrset int
.Ft int
.Fn wattron int
.Ft int
.Fn wattroff int
.Ft int
.Fn wattrset int
.Ft chtype
.Fn getattrs "WINDOW *win"
.Sh DESCRIPTION
These functions manipulate attributes on
.Dv stdscr
or on the specified window.
The attributes that can be manipulated are:
.Pp
.Bl -tag -width "A_ALTCHARSET" -compact -offset indent
.It A_NORMAL
no special attributes are applied
.It A_STANDOUT
characters are displayed in standout mode
.It A_UNDERLINE
characters are displayed underlined
.It A_REVERSE
characters are displayed in inverse video
.It A_BLINK
characters blink
.It A_DIM
characters are displayed at a lower intensity
.It A_BOLD
characters are displayed at a higher intensity
.It A_BLANK
characters are added as blanks
.It A_PROTECT
characters are protected from modification
.It A_ALTCHARSET
characters are displayed using the alternate character set (ACS)
.El
along with color.
.Pp
The function
.Fn attron
turns on the attributes specified in
.Fa attr
on
.Dv stdscr .
.Pp
The function
.Fn attroff
turns off the attributes specified in
.Fa attr
on
.Dv stdscr .
.Pp
The function
.Fn attrset
sets the attributes of
.Dv stdscr
to those specified in
.Fa attr ,
turning off any others.
To turn off all the attributes (including color and alternate character set),
use
.Fn attrset A_NORMAL .
.Pp
Multiple attributes can be manipulated by combining the attributes
using a logical
.Em OR .
For example,
.Fn attron "A_REVERSE | A_BOLD"
will turn on both inverse video and higher intensity.
.Pp
The functions
.Fn wattron ,
.Fn wattroff
and
.Fn wattrset
are equivalent to
.Fn attron ,
.Fn attroff
and
.Fn attrset ,
respectively, excepting that the character is added to the window specified by
.Fa win .
.Pp
The function
.Fn getattrs
returns the attributes that are currently applied to window specified by
.Fa win .
.Sh RETURN VALUES
These functions return OK on success and ERR on failure.
.Sh SEE ALSO
.Xr curses_addch 3 ,
.Xr curses_addstr 3 ,
.Xr curses_background 3 ,
.Xr curses_color 3 ,
.Xr curses_insertch 3 ,
.Xr curses_standout 3 ,
.Xr curses_underscore 3
.Sh STANDARDS
The
.Nx
Curses library complies with the X/Open Curses specification, part of the
Single Unix Specification.
.Sh HISTORY
These functions first appeared in
.Nx 1.5 .
.Sh BUGS
Some terminals do not support characters with both color and other attributes
set.
In this case, the other attribute is displayed instead of the color attribute.