getch

static VALUE
window_getch(VALUE obj)
{
    struct windata *winp;
    struct wgetch_arg arg;
    int c;

    GetWINDOW(obj, winp);
    arg.win = winp->window;
    rb_thread_blocking_region(wgetch_func, (void *)&arg, RUBY_UBF_IO, 0);
    c = arg.c;
    if (c == EOF) return Qnil;
    if (rb_isprint(c)) {
        char ch = (char)c;

        return rb_locale_str_new(&ch, 1);
    }
    return UINT2NUM(c);
}