Re: Bug in refresh() ? :(

[Thomas Dickey]

On Thu, Aug 30, 2001 at 11:27:49AM -0500, Dan Nelson wrote:
> In the last episode (Aug 30), Yonglin ma said:
> > Here is the sample program 15-4.c from <<Linux Programing Bible>>.
> > 
> >     init_pair(1, COLOR_GREEN, COLOR_BLACK);
> >     attrset(COLOR_PAIR(1));
> >     printw("Notice the existing text printed to the screen with this\n");
> >     printw("pair is not modified, but this new text has the new color.\n");
> > 
> > But the program doesn't run as expected! the existing text with
> > COLOR_PAIR(1) modified (repaint with the new color)!
> 
> The program's comment is wrong.  The ncurses init_pair manpage reads:
> 
>        If the color-pair was previously initialized, the screen is
>        refreshed and all occurrences of that color-pair is changed to
>        the new definition.

perhaps that book was written against an old version of ncurses (the fix
is post-4.2 btw):

980627
        + modify init_pair so that if a color-pair is reinitialized, we will
          repaint the areas of the screen whose color changes, like SVr4 curses
          (reported by Christian Maurer <address@hidden>).

-- 
Thomas E. Dickey <address@hidden>
http://dickey.his.com
ftp://dickey.his.com