memset(expanded_buf, 0, sizeof(expanded_buf));
ret = dn_expand(startptr, endptr, ptr, expanded_buf, sizeof(expanded_buf));
if (ret < 0) break;
memset(expanded_buf, 0, sizeof(expanded_buf));
ret = dn_expand(startptr, endptr, ptr, expanded_buf, sizeof(expanded_buf));
if (ret < 0) break;