MirBSD manpage: bkgd(3), bkgdset(3), curs_bkgd(3), getbkgd(3), wbkgd(3), wbkgdset(3)

curs_bkgd(3)        UNIX Programmer's Manual         curs_bkgd(3)


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


     #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);


     The bkgdset and wbkgdset routines manipulate the background
     of the named window. The window background is a chtype con-
     sisting 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 attri-
     bute part of the background is displayed as the graphic ren-
     dition 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,

MirBSD #10-current     Printed 2022-12-23                       1

curs_bkgd(3)        UNIX Programmer's Manual         curs_bkgd(3)

     Issue 4. It specifies that bkgd and wbkgd return ERR on
     failure. but gives no failure conditions.


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

MirBSD #10-current     Printed 2022-12-23                       2

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