initialize_copy

static VALUE
ossl_x509req_copy(VALUE self, VALUE other)
{
    X509_REQ *a, *b, *req;

    rb_check_frozen(self);
    if (self == other) return self;
    GetX509Req(self, a);
    GetX509Req(other, b);
    if (!(req = X509_REQ_dup(b))) {
        ossl_raise(eX509ReqError, NULL);
    }
    X509_REQ_free(a);
    DATA_PTR(self) = req;

    return self;
}