Function ncursesw::shims::ncurses::copywin

pub unsafe fn copywin(
    srcwin: WINDOW, 
    dstwin: WINDOW, 
    sminrow: i32, 
    smincol: i32, 
    dminrow: i32, 
    dmincol: i32, 
    dmaxrow: i32, 
    dmaxcol: i32, 
    overlay: i32
) -> i32

Safety

https://invisible-island.net/ncurses/man/curs_overlay.3x.html