bkgdset, wbkgdset, bkgd, wbkgd, getbkgd - curses window
background manipulation routines
void bkgdset(const chtype ch);
void wbkgdset(WINDOW *win, const chtype ch);
int bkgd(const chtype ch);
int wbkgd(WINDOW *win, const chtype ch);
chtype getbkgd(WINDOW *win);
The bkgdset and wbkgdset routines manipulate the background
of the named window. The window background is a
chtype consisting of any combination of attributes (i.e.,
rendition) and a character. The attribute part of the
background is combined (OR'ed) with all non-blank characters
that are written into the window with waddch. Both
the character and attribute parts of the background are
combined with the blank characters. The background
becomes a property of the character and moves with the
character through any scrolling and insert/delete
To the extent possible on a particular terminal, the
attribute part of the background is displayed as the
graphic rendition of the character put on the screen.
The bkgd and wbkgd functions set the background property
of the current or specified window and then apply this
setting to every character position in that window:
The rendition of every character on the screen is
changed to the new background rendition.
Wherever the former background character appears,
it is changed to the new background character.
The getbkgd function returns the given window's current
background character/attribute pair.
The routines bkgd and wbkgd return the integer OK. The
SVr4.0 manual says "or a non-negative integer if immedok
is set", but this appears to be an error.
Note that bkgdset and bkgd may be macros.
These functions are described in the XSI Curses standard,
Issue 4. The draft does not include const qualifiers on
the arguments. The standard specifies that bkgd and wbkgd
return ERR, on failure. but gives no failure conditions.
curses(3), curs_addch(3), curs_outopts(3)
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