Move the cursor to coordinates (y,x), get a string from the
    terminal screen, store it in the variable str (which must be
    large enough to contain the string), and echo it on the specified
    window. The mvgetstr function acts on the stdscr window.

    Format

      #include  <curses.h>

      int mvgetstr  (int y, int x, char *str);

      int mvwgetstr  (WINDOW *win, int y, int x, char *str);