.\"	$NetBSD: curses_attributes.3,v 1.6 2003/05/21 21:22:15 jdc Exp $
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.Dd May 21, 2003
.Dt CURSES_ATTRIBUTES 3
.Os
.Sh NAME
.Nm curses_attributes ,
.Nm attron ,
.Nm attroff ,
.Nm attrset ,
.Nm wattron ,
.Nm wattroff ,
.Nm wattrset ,
.Nm getattrs ,
.Nm attr_on ,
.Nm attr_off ,
.Nm attr_set ,
.Nm color_set ,
.Nm attr_get ,
.Nm wattr_on ,
.Nm wattr_off ,
.Nm wattr_set ,
.Nm wcolor_set ,
.Nm wattr_get
.Nd curses general attribute manipulation routines
.Sh LIBRARY
.Lb libcurses
.Sh SYNOPSIS
.In curses.h
.Ft int
.Fn attron "int attr"
.Ft int
.Fn attroff "int attr"
.Ft int
.Fn attrset "int attr"
.Ft int
.Fn wattron "WINDOW * win" "int attr"
.Ft int
.Fn wattroff "WINDOW * win" "int attr"
.Ft int
.Fn wattrset "WINDOW * win" "int attr"
.Ft chtype
.Fn getattrs "WINDOW *win"
.Ft int
.Fn attr_on "attr_t attr" "void *opt"
.Ft int
.Fn attr_off "attr_t attr" "void *opt"
.Ft int
.Fn attr_set "attr_t attr" "short pair" "void *opt"
.Ft int
.Fn color_set "short pair" "void *opt"
.Ft int
.Fn attr_get "attr_t *attr" "short *pair" "void *opt"
.Ft int
.Fn wattr_on "WINDOW *win" "attr_t attr" "void *opt"
.Ft int
.Fn wattr_off "WINDOW *win" "attr_t attr" "void *opt"
.Ft int
.Fn wattr_set "WINDOW *win" "attr_t attr" "short pair" "void *opt"
.Ft int
.Fn wcolor_set "WINDOW *win" "short pair" "void *opt"
.Ft int
.Fn wattr_get "WINDOW *win" "attr_t *attr" "short *pair" "void *opt"
.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 "COLOR_PAIR(n)" -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)
.It COLOR_PAIR(n)
characters are displayed using color pair n.
.El
.Pp
The functions
.Fn attron
and
.Fn attr_on
turn on the attributes specified in
.Fa attr
on
.Dv stdscr .
.Pp
The functions
.Fn attroff
and
.Fn attr_off
turn 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 function
.Fn attr_set
sets the attributes of
.Dv stdscr
to those specified in
.Fa attr
and
.Fa pair ,
turning off any others.
Note that a color pair specified in
.Fa pair
will override any color pair specified in
.Fa attr .
.Pp
The function
.Fn color_set
sets the color pair attribute to the pair specified in
.Fa pair .
.Pp
The functions
.Fn wattron ,
.Fn wattr_on ,
.Fn wattroff ,
.Fn wattr_on ,
.Fn wattrset ,
.Fn wattr_set
and
.Fn wcolor_set
are equivalent to
.Fn attron ,
.Fn attr_on ,
.Fn attroff
.Fn attr_off ,
.Fn attrset ,
.Fn attr_set
and
.Fn color_set
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 .
.Pp
The function
.Fn attr_get
sets
.Fa attr
to the attributes and
.Fa pair
to the color pair currently applied to
.Dv stdscr .
Either of
.Fa attr
and
.Fa pair
can be
.Dv NULL ,
if the relevant value is of no interest.
.Pp
The function
.Fn wattr_get
is equivalent to
.Fn attr_get ,
excepting that the attributes and color pair currently applied to
.Fa win
are set.
.Sh RETURN VALUES
These functions return OK on success and ERR on failure.
.Sh SEE ALSO
.Xr curses_addch 3 ,
.Xr curses_addchstr 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 NOTES
The
.Fa opt
argument is not currently used but is reserved for a future version of the
specification.
.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.