umb_addstr
if (!umb_addstr(&cp, sizeof (cp), &off, pin, pinlen,
if (!umb_addstr(&cp, sizeof (cp), &off, newpin, newpinlen,
if (!umb_addstr(&cp, sizeof (cp), &off, NULL, 0,
if (!umb_addstr(c, sizeof (*c), &off, sc->sc_info.apn,