Terminate strings (comm names) on null terminator

When a field of a certain size is parsed as string stop
if a null terminator is encountered.

Bug 579627

Change-Id: I57505b0cdb8ae4eab6fd791535de63fc58765cf9
Signed-off-by: Fabrizio Iannetti <fabrizio.iannetti@gmail.com>
Reviewed-on: https://git.eclipse.org/r/c/tracecompass.incubator/org.eclipse.tracecompass.incubator/+/192600
Tested-by: Trace Compass Bot <tracecompass-bot@eclipse.org>
Tested-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>

tracetypes/org.eclipse.tracecompass.incubator.ftrace.core/src/org/eclipse/tracecompass/incubator/internal/ftrace/core/binary/iterator/BinaryFTraceIteratorHelper.java

@@ -227,6 +227,11 @@ private Object getPrimitiveDataValue(BinaryFTraceFormatField formatField, byte[]
     }
 
     private static String readStringField(byte[] fieldData) {
+        for (int i = 0; i < fieldData.length; i++) {
+            if (fieldData[i] == 0) {
+                return new String(fieldData, 0, i);
+            }
+        }
         return new String(fieldData);
     }