if ( Character.isDigit(hostname.charAt(0)) ) {
            int i, len, dots;
            char[] data;

            i = dots = 0; /* quick IP address validation */
            len = hostname.length();
            data = hostname.toCharArray();
            while ( i < len && Character.isDigit(data[ i++ ]) ) {
                if ( i == len && dots == 3 ) {
                    // probably an IP address
                    return true;

	w.closeDot()
	w.dot = &dotWriter{w: w}
	return w.dot
}

func (w *Writer) closeDot() {
	if w.dot != nil {
		w.dot.Close() // sets w.dot = nil
	}
}

type dotWriter struct {
	w     *Writer
	state int
}

const (
	wstateBegin     = iota // initial state; must be zero
	wstateBeginLine        // beginning of line
	wstateCR               // wrote \r (possibly at end of line)

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// dot -Tpng src/docs/userguide/img/cpp-unit-test-variant-task-graph.dot > src/docs/userguide/img/cpp-unit-test-variant-task-graph.png
digraph cppUnitTestVariantTaskGraph {
  graph [ dpi = 100, fontname="Sans"];
  node [fontname = "Sans"];
  edge [fontname = "Sans"];

Jordan Liggitt <******@****.***> 1663901449 -0400

Jackie Elliott <******@****.***> 1692924238 -0700

Jordan Liggitt <******@****.***> 1663901449 -0400

Jackie Elliott <******@****.***> 1692924238 -0700

Jordan Liggitt <******@****.***> 1663901449 -0400

 * label is longer than 63 characters. Trailing dots are okay.
 */
internal fun String.containsInvalidLabelLengths(): Boolean {
  if (length !in 1..253) return true

  var labelStart = 0
  while (true) {
    val dot = indexOf('.', startIndex = labelStart)
    val labelLength =
      when (dot) {
        -1 -> length - labelStart
        else -> dot - labelStart
      }
    if (labelLength !in 1..63) return true

        if( Character.isDigit( hostname.charAt( 0 ))) {
            int i, len, dots;
            char[] data;

            i = dots = 0;                    /* quick IP address validation */
            len = hostname.length();
            data = hostname.toCharArray();
            while( i < len && Character.isDigit( data[i++] )) {
                if( i == len && dots == 3 ) {
                    // probably an IP address