curs_bkgd(3X)                                                  curs_bkgd(3X)

NAME         top

       bkgdset,  wbkgdset,  bkgd,  wbkgd, getbkgd - curses window background
       manipulation routines

SYNOPSIS         top

       #include <curses.h>

       void bkgdset(chtype ch);
       void wbkgdset(WINDOW *win, chtype ch);
       int bkgd(chtype ch);
       int wbkgd(WINDOW *win, chtype ch);
       chtype getbkgd(WINDOW *win);

DESCRIPTION         top

       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 line/character operations.

       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.

RETURN VALUE         top

       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.

NOTES         top

       Note that bkgdset and bkgd may be macros.

PORTABILITY         top

       These functions are described in the XSI Curses standard, Issue 4.
       It specifies that bkgd and wbkgd return ERR on failure, but gives no
       failure conditions.

SEE ALSO         top

       curses(3X), curs_addch(3X), curs_attr(3X), curs_outopts(3X)

COLOPHON         top

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