XftFont *xftfont = XftFontOpen(Xdisplay, Xscreenno,
                                   XFT_FAMILY, XftTypeString, (char *)face,
                                   XFT_PIXEL_SIZE, XftTypeInteger, 20,
                                   (void *)0);
    int n = 0;
    for(int c = 0; c < 128; c++)
        if(!XftCharExists(Xdisplay, xftfont, c + 256))
            n++;

    XftFont *xftfont = XftFontOpen(Xdisplay, Xscreenno,
                                   XFT_FAMILY, XftTypeString, (char *)face,
                                   XFT_PIXEL_SIZE, XftTypeInteger, 20,
                                   (void *)0);
    if (!xftfont) return 0;
    int n = 0;