/*
 * call-seq: from_state(opts)
 *
 * Creates a State object from _opts_, which ought to be Hash to create a
 * new State instance configured by _opts_, something else to create an
 * unconfigured instance. If _opts_ is a State object, it is just returned.
 */
static VALUE cState_from_state_s(VALUE self, VALUE opts)
{
    if (rb_obj_is_kind_of(opts, self)) {
        return opts;
    } else if (rb_obj_is_kind_of(opts, rb_cHash)) {
        return rb_funcall(self, i_new, 1, opts);
    } else {
        if (NIL_P(CJSON_SAFE_STATE_PROTOTYPE)) {
            CJSON_SAFE_STATE_PROTOTYPE = rb_const_get(mJSON, rb_intern("SAFE_STATE_PROTOTYPE"));
        }
        return CJSON_SAFE_STATE_PROTOTYPE;
    }
}