MAC_MAX_LABEL_BUF_LEN
if (strlen(elements) >= MAC_MAX_LABEL_BUF_LEN)
(*mac)->m_string = malloc(MAC_MAX_LABEL_BUF_LEN);
(*mac)->m_buflen = MAC_MAX_LABEL_BUF_LEN;
if (mac->m_buflen > MAC_MAX_LABEL_BUF_LEN ||