Re: mvcur() function does not work

[Thomas Dickey]

On Mon, 21 May 2007, Alexey Miheev wrote:

> I have tried to use mvcur() function to move the cursor on screen. But
> as I see this functions does nothing on major Linux distributions (Red
> Hat 4, SuSe 10, Ubuntu 6.06).
> LSB 3.1 refers to SUSv2 (The Single UNIX Specification, Version 2) for the
> description of the libncurses functions. According to this standard,
> the function returns 0 only upon successful completion.
>
> In the following code, mvcur() returns OK, but the visible cursor does
> not change its place.

That's not surprising.

mvcur() is a low-level function, like tputs().  Note the comment at the
end of http://www.opengroup.org/onlinepubs/007908799/xcurses/mvcur.html -

After use of mvcur(), the model Curses maintains of the state of the 
terminal might not match the actual state of the terminal. The application 
should touch and refresh the window before resuming conventional use of 
Curses.

Curses may use this function internally (ncurses does), but calling it 
from a curses application doesn't have a specified behavior.

> > #include <stdio.h>
> #include <curses.h>
>
> int main(int argc, char* argv[])
> {
>        int res;
>
>        initscr();
>
>        getch();
>        move(LINES/2, COLS/2);
>        getch();
>        res=mvcur(LINES/2, COLS/2, 5, 5);
>        getch();
>
>        endwin();
>        printf("mvcur() return value was %d\n", res);
>
>        return 0;
> }
>
>
> Regards, Alexey Miheev
>
> Linux Verification Center, ISPRAS
> web:    http://www.linuxtesting.org
> e-mail: address@hidden
>
>
>
>
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--
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net