c_str -> data

32 files changed, 68 insertions, 68 deletions

diff --git a/document/src/tests/documenttestcase.cpp b/document/src/tests/documenttestcase.cpp
index 76226129997..7735ccdbb1d 100644
--- a/document/src/tests/documenttestcase.cpp
+++ b/document/src/tests/documenttestcase.cpp
@@ -886,7 +886,7 @@ TEST(DocumentTest, testGenerateSerializedFile)
 
     fd = open((serializedDir + "/serializecpp-lz4-level9.dat").c_str(),
               O_WRONLY | O_TRUNC | O_CREAT, 0644);
-    if (write(fd, lz4buf.c_str(), lz4buf.size()) != (ssize_t)lz4buf.size()) {
+    if (write(fd, lz4buf.data(), lz4buf.size()) != (ssize_t)lz4buf.size()) {
         throw vespalib::Exception("write failed");
     }
     close(fd);
diff --git a/document/src/tests/documentupdatetestcase.cpp b/document/src/tests/documentupdatetestcase.cpp
index 5fab79efce8..b8a0101a782 100644
--- a/document/src/tests/documentupdatetestcase.cpp
+++ b/document/src/tests/documentupdatetestcase.cpp
@@ -85,7 +85,7 @@ void
 writeBufferToFile(const nbostream &buf, const vespalib::string &fileName)
 {
     auto file = std::fstream(fileName, std::ios::out | std::ios::binary);
-    file.write(buf.c_str(), buf.size());
+    file.write(buf.data(), buf.size());
     assert(file.good());
     file.close();
 }
diff --git a/document/src/tests/fieldpathupdatetestcase.cpp b/document/src/tests/fieldpathupdatetestcase.cpp
index 39360119766..213ac2e5432 100644
--- a/document/src/tests/fieldpathupdatetestcase.cpp
+++ b/document/src/tests/fieldpathupdatetestcase.cpp
@@ -1096,7 +1096,7 @@ TEST_F(FieldPathUpdateTestCase, testGenerateSerializedFile)
 
     int fd = open(TEST_PATH("data/serialize-fieldpathupdate-cpp.dat").c_str(),
                   O_WRONLY | O_TRUNC | O_CREAT, 0644);
-    if (write(fd, buf.c_str(), buf.size()) != (ssize_t)buf.size()) {
+    if (write(fd, buf.data(), buf.size()) != (ssize_t)buf.size()) {
     	throw vespalib::Exception("write failed");
     }
     close(fd);
diff --git a/document/src/vespa/document/fieldvalue/fieldvalue.cpp b/document/src/vespa/document/fieldvalue/fieldvalue.cpp
index 49efbd83c61..7737d03b45a 100644
--- a/document/src/vespa/document/fieldvalue/fieldvalue.cpp
+++ b/document/src/vespa/document/fieldvalue/fieldvalue.cpp
@@ -47,7 +47,7 @@ FieldValue::hash() const
 {
     vespalib::nbostream os;
     serialize(os);
-    return vespalib::hashValue(os.c_str(), os.size()) ;
+    return vespalib::hashValue(os.data(), os.size()) ;
 }
 
 bool
diff --git a/document/src/vespa/document/serialization/vespadocumentserializer.cpp b/document/src/vespa/document/serialization/vespadocumentserializer.cpp
index 570a51907da..4d60befba52 100644
--- a/document/src/vespa/document/serialization/vespadocumentserializer.cpp
+++ b/document/src/vespa/document/serialization/vespadocumentserializer.cpp
@@ -293,10 +293,10 @@ vespalib::ConstBufferRef
 compressStream(const CompressionConfig &config, nbostream &stream, vespalib::DataBuffer & compressed_data)
 {
     using vespalib::compression::compress;
-    vespalib::ConstBufferRef buf(stream.c_str(), stream.size());
+    vespalib::ConstBufferRef buf(stream.data(), stream.size());
     if (config.useCompression() && bigEnough(stream.size(), config)) {
         CompressionConfig::Type compressedType = compress(config,
-                                                          vespalib::ConstBufferRef(stream.c_str(), stream.size()),
+                                                          vespalib::ConstBufferRef(stream.data(), stream.size()),
                                                           compressed_data, false);
         if (compressedType != config.type ||
             ! compressionSufficient(config, stream.size(), compressed_data.getDataLen()))
diff --git a/documentapi/src/vespa/documentapi/messagebus/messages/visitor.cpp b/documentapi/src/vespa/documentapi/messagebus/messages/visitor.cpp
index 102a2308768..453e93fd7eb 100644
--- a/documentapi/src/vespa/documentapi/messagebus/messages/visitor.cpp
+++ b/documentapi/src/vespa/documentapi/messagebus/messages/visitor.cpp
@@ -162,7 +162,7 @@ DocumentListMessage::Entry::serialize(vespalib::GrowableByteBuffer& buf) const
 {
     buf.putLong(_timestamp);
     vespalib::nbostream nbo = _document->serialize();
-    buf.putBytes(nbo.c_str(), nbo.size());
+    buf.putBytes(nbo.data(), nbo.size());
     buf.putByte(_removeEntry ? 1 : 0);
 }
 
diff --git a/searchcore/src/apps/vespa-transactionlog-inspect/vespa-transactionlog-inspect.cpp b/searchcore/src/apps/vespa-transactionlog-inspect/vespa-transactionlog-inspect.cpp
index ca8274aab00..54fc072c2b1 100644
--- a/searchcore/src/apps/vespa-transactionlog-inspect/vespa-transactionlog-inspect.cpp
+++ b/searchcore/src/apps/vespa-transactionlog-inspect/vespa-transactionlog-inspect.cpp
@@ -298,7 +298,7 @@ public:
     {
     }
     virtual RPC::Result receive(const Packet &packet) override {
-        vespalib::nbostream_longlivedbuf handle(packet.getHandle().c_str(), packet.getHandle().size());
+        vespalib::nbostream_longlivedbuf handle(packet.getHandle().data(), packet.getHandle().size());
         try {
             while (handle.size() > 0) {
                 Packet::Entry entry;
diff --git a/searchcore/src/tests/grouping/grouping.cpp b/searchcore/src/tests/grouping/grouping.cpp
index e5ac6ed15b0..6d7bd243e71 100644
--- a/searchcore/src/tests/grouping/grouping.cpp
+++ b/searchcore/src/tests/grouping/grouping.cpp
@@ -168,7 +168,7 @@ TEST_F("testGroupingContextInitialization", DoomFixture()) {
     nos << (uint32_t)1;
     baseRequest.serialize(nos);
 
-    GroupingContext context(f1.clock, f1.timeOfDoom, os.c_str(), os.size());
+    GroupingContext context(f1.clock, f1.timeOfDoom, os.data(), os.size());
     ASSERT_TRUE(!context.empty());
     GroupingContext::GroupingList list = context.getGroupingList();
     ASSERT_TRUE(list.size() == 1);
@@ -226,7 +226,7 @@ TEST_F("testGroupingContextSerializing", DoomFixture()) {
     context.serialize();
     vespalib::nbostream & res(context.getResult());
     EXPECT_EQUAL(res.size(), os.size());
-    ASSERT_TRUE(memcmp(res.c_str(), os.c_str(), res.size()) == 0);
+    ASSERT_TRUE(memcmp(res.data(), os.data(), res.size()) == 0);
 }
 
 TEST_F("testGroupingManager", DoomFixture()) {
diff --git a/searchcore/src/tests/proton/matching/matching_test.cpp b/searchcore/src/tests/proton/matching/matching_test.cpp
index 8c4bf0d55b0..95ab43dbcba 100644
--- a/searchcore/src/tests/proton/matching/matching_test.cpp
+++ b/searchcore/src/tests/proton/matching/matching_test.cpp
@@ -616,7 +616,7 @@ TEST("require that grouping is performed (multi-threaded)") {
             Grouping grequest;
             grequest.setRoot(Group().addResult(SumAggregationResult().setExpression(createAttr())));
             grequest.serialize(os);
-            request->groupSpec.assign(buf.c_str(), buf.c_str() + buf.size());
+            request->groupSpec.assign(buf.data(), buf.data() + buf.size());
         }
         SearchReply::UP reply = world.performSearch(request, threads);
         {
diff --git a/searchcore/src/tests/proton/matching/request_context/request_context_test.cpp b/searchcore/src/tests/proton/matching/request_context/request_context_test.cpp
index 109a4cc7a25..c3338a973c4 100644
--- a/searchcore/src/tests/proton/matching/request_context/request_context_test.cpp
+++ b/searchcore/src/tests/proton/matching/request_context/request_context_test.cpp
@@ -36,7 +36,7 @@ private:
     void insert_tensor_in_properties(const vespalib::string& tensor_name, const Value& tensor_value) {
         vespalib::nbostream stream;
         DefaultTensorEngine::ref().encode(tensor_value, stream);
-        _props.add(tensor_name, vespalib::stringref(stream.c_str(), stream.size()));
+        _props.add(tensor_name, vespalib::stringref(stream.data(), stream.size()));
     }
 
 public:
diff --git a/searchcore/src/tests/proton/server/feedstates_test.cpp b/searchcore/src/tests/proton/server/feedstates_test.cpp
index 96096c0401f..ca48fb773d8 100644
--- a/searchcore/src/tests/proton/server/feedstates_test.cpp
+++ b/searchcore/src/tests/proton/server/feedstates_test.cpp
@@ -105,7 +105,7 @@ RemoveOperationContext::RemoveOperationContext(search::SerialNum serial)
       str(), packet()
 {
     op.serialize(str);
-    ConstBufferRef buf(str.c_str(), str.wp());
+    ConstBufferRef buf(str.data(), str.wp());
     packet.reset(new Packet());
     packet->add(Packet::Entry(serial, FeedOperation::REMOVE, buf));
 }
diff --git a/searchcore/src/vespa/searchcore/proton/server/feedstates.cpp b/searchcore/src/vespa/searchcore/proton/server/feedstates.cpp
index 5a6a990df9b..faee5914a97 100644
--- a/searchcore/src/vespa/searchcore/proton/server/feedstates.cpp
+++ b/searchcore/src/vespa/searchcore/proton/server/feedstates.cpp
@@ -49,7 +49,7 @@ handleProgress(TlsReplayProgress &progress, SerialNum currentSerial)
 void
 handlePacket(PacketWrapper::SP wrap, EntryHandler entryHandler)
 {
-    vespalib::nbostream_longlivedbuf handle(wrap->packet.getHandle().c_str(), wrap->packet.getHandle().size());
+    vespalib::nbostream_longlivedbuf handle(wrap->packet.getHandle().data(), wrap->packet.getHandle().size());
     while (handle.size() > 0) {
         Packet::Entry entry;
         entry.deserialize(handle);
diff --git a/searchcore/src/vespa/searchcore/proton/server/tlcproxy.cpp b/searchcore/src/vespa/searchcore/proton/server/tlcproxy.cpp
index bfc59dee35e..bbd02d7efce 100644
--- a/searchcore/src/vespa/searchcore/proton/server/tlcproxy.cpp
+++ b/searchcore/src/vespa/searchcore/proton/server/tlcproxy.cpp
@@ -14,7 +14,7 @@ namespace proton {
 void TlcProxy::commit(search::SerialNum serialNum, search::transactionlog::Type type,
                       const vespalib::nbostream &buf, DoneCallback onDone)
 {
-    Packet::Entry entry(serialNum, type, vespalib::ConstBufferRef(buf.c_str(), buf.size()));
+    Packet::Entry entry(serialNum, type, vespalib::ConstBufferRef(buf.data(), buf.size()));
     Packet packet;
     packet.add(entry);
     packet.close();
diff --git a/searchlib/src/apps/docstore/create-idx-from-dat.cpp b/searchlib/src/apps/docstore/create-idx-from-dat.cpp
index 5990b3ec805..46aca14325f 100644
--- a/searchlib/src/apps/docstore/create-idx-from-dat.cpp
+++ b/searchlib/src/apps/docstore/create-idx-from-dat.cpp
@@ -78,7 +78,7 @@ generate(uint64_t serialNum, size_t chunks, FastOS_FileInterface & idxFile, size
             fprintf(stdout, "Failed with lengthError %ld due to '%s'\n", lengthError, e.what());
         }
     }
-    idxFile.Write2(os.c_str(), os.size());
+    idxFile.Write2(os.data(), os.size());
     return serialNum;
 }
 
diff --git a/searchlib/src/tests/aggregator/perdocexpr.cpp b/searchlib/src/tests/aggregator/perdocexpr.cpp
index 513e94321e1..610fc58e98f 100644
--- a/searchlib/src/tests/aggregator/perdocexpr.cpp
+++ b/searchlib/src/tests/aggregator/perdocexpr.cpp
@@ -489,9 +489,9 @@ TEST("testResultNodes") {
     double d(786324.78);
     nbostream os;
     os << j << d;
-    RawResultNode r1(os.c_str(), sizeof(j));
+    RawResultNode r1(os.data(), sizeof(j));
     EXPECT_EQUAL(r1.getInteger(), 789);
-    RawResultNode r2(os.c_str() + sizeof(j), sizeof(d));
+    RawResultNode r2(os.data() + sizeof(j), sizeof(d));
     EXPECT_EQUAL(r2.getFloat(), 786324.78);
 
     StringResultNode s1, s2("a"), s3("a"), s4("b"), s5("bb");
@@ -560,7 +560,7 @@ void testStreaming(const Identifiable &v) {
 
     EXPECT_EQUAL(os2.size(), os3.size());
     ASSERT_TRUE(os2.size() == os3.size());
-    EXPECT_EQUAL(0, memcmp(os2.c_str(), os3.c_str(), os3.size()));
+    EXPECT_EQUAL(0, memcmp(os2.data(), os3.data(), os3.size()));
 }
 
 TEST("testTimeStamp") {
diff --git a/searchlib/src/tests/features/imported_dot_product/imported_dot_product_test.cpp b/searchlib/src/tests/features/imported_dot_product/imported_dot_product_test.cpp
index b7fb3d2b6a1..2f710c5d6e1 100644
--- a/searchlib/src/tests/features/imported_dot_product/imported_dot_product_test.cpp
+++ b/searchlib/src/tests/features/imported_dot_product/imported_dot_product_test.cpp
@@ -111,7 +111,7 @@ struct ArrayFixture : FixtureBase {
     void check_prepare_state_output(const vespalib::tensor::Tensor & tensor, const ExpectedType & expected) {
         vespalib::nbostream os;
         vespalib::tensor::TypedBinaryFormat::serialize(os, tensor);
-        vespalib::string input_vector(os.c_str(), os.size());
+        vespalib::string input_vector(os.data(), os.size());
         check_prepare_state_output(".tensor", input_vector, expected);
     }
 
diff --git a/searchlib/src/tests/transactionlog/translogclient_test.cpp b/searchlib/src/tests/transactionlog/translogclient_test.cpp
index 861216fd53c..0dced597917 100644
--- a/searchlib/src/tests/transactionlog/translogclient_test.cpp
+++ b/searchlib/src/tests/transactionlog/translogclient_test.cpp
@@ -77,7 +77,7 @@ public:
 
 RPC::Result CallBackTest::receive(const Packet & p)
 {
-    nbostream_longlivedbuf  h(p.getHandle().c_str(), p.getHandle().size());
+    nbostream_longlivedbuf  h(p.getHandle().data(), p.getHandle().size());
     LOG(info,"CallBackTest::receive (%zu, %zu, %zu)(%s)", h.rp(), h.size(), h.capacity(), myhex(h.peek(), h.size()).c_str());
     while(h.size() > 0) {
         Packet::Entry e;
@@ -103,7 +103,7 @@ public:
 
 RPC::Result CallBackManyTest::receive(const Packet & p)
 {
-    nbostream_longlivedbuf h(p.getHandle().c_str(), p.getHandle().size());
+    nbostream_longlivedbuf h(p.getHandle().data(), p.getHandle().size());
     for(;h.size() > 0; _count++, _value++) {
         Packet::Entry e;
         e.deserialize(h);
@@ -135,7 +135,7 @@ public:
 
 RPC::Result CallBackUpdate::receive(const Packet & packet)
 {
-    nbostream_longlivedbuf h(packet.getHandle().c_str(), packet.getHandle().size());
+    nbostream_longlivedbuf h(packet.getHandle().data(), packet.getHandle().size());
     while (h.size() > 0) {
         Packet::Entry e;
         e.deserialize(h);
@@ -187,7 +187,7 @@ public:
 
 RPC::Result CallBackStatsTest::receive(const Packet & p)
 {
-    nbostream_longlivedbuf h(p.getHandle().c_str(), p.getHandle().size());
+    nbostream_longlivedbuf h(p.getHandle().data(), p.getHandle().size());
     for(;h.size() > 0; ++_count) {
         Packet::Entry e;
         e.deserialize(h);
@@ -236,13 +236,13 @@ bool Test::partialUpdateTest()
     nbostream os;
     os << du;
 
-    vespalib::ConstBufferRef bb(os.c_str(), os.size());
+    vespalib::ConstBufferRef bb(os.data(), os.size());
     LOG(info, "DU : %s", myhex(bb.c_str(), bb.size()).c_str());
     Packet::Entry e(7, du.getClass().id(), bb);
     Packet pa;
     pa.add(e);
     pa.close();
-    ASSERT_TRUE(session.commit(vespalib::ConstBufferRef(pa.getHandle().c_str(), pa.getHandle().size())));
+    ASSERT_TRUE(session.commit(vespalib::ConstBufferRef(pa.getHandle().data(), pa.getHandle().size())));
 
     CallBackUpdate ca;
     TransLogClient::Visitor::UP visitor = tls.createVisitor("test1", ca);
@@ -320,10 +320,10 @@ bool Test::fillDomainTest(TransLogClient::Session * s1, const vespalib::string &
     ASSERT_TRUE (!b.add(e1));
     a.close();
     b.close();
-    ASSERT_TRUE (s1->commit(vespalib::ConstBufferRef(a.getHandle().c_str(), a.getHandle().size())));
-    ASSERT_TRUE (s1->commit(vespalib::ConstBufferRef(b.getHandle().c_str(), b.getHandle().size())));
+    ASSERT_TRUE (s1->commit(vespalib::ConstBufferRef(a.getHandle().data(), a.getHandle().size())));
+    ASSERT_TRUE (s1->commit(vespalib::ConstBufferRef(b.getHandle().data(), b.getHandle().size())));
     try {
-        s1->commit(vespalib::ConstBufferRef(a.getHandle().c_str(), a.getHandle().size()));
+        s1->commit(vespalib::ConstBufferRef(a.getHandle().data(), a.getHandle().size()));
         ASSERT_TRUE(false);
     } catch (const std::exception & e) {
         EXPECT_EQUAL(vespalib::string("commit failed with code -2. server says: Exception during commit on " + name + " : Incomming serial number(1) must be bigger than the last one (3)."), e.what());
@@ -340,7 +340,7 @@ bool Test::fillDomainTest(TransLogClient::Session * s1, const vespalib::string &
     EXPECT_EQUAL(a.range().to(), 3u);
 
     Packet::Entry e;
-    vespalib::nbostream h(a.getHandle().c_str(), a.getHandle().size());
+    vespalib::nbostream h(a.getHandle().data(), a.getHandle().size());
     e.deserialize(h);
     e.deserialize(h);
     e.deserialize(h);
@@ -358,13 +358,13 @@ void Test::fillDomainTest(TransLogClient::Session * s1, size_t numPackets, size_
             Packet::Entry e(value+1, j+1, vespalib::ConstBufferRef((const char *)&value, sizeof(value)));
             if ( ! p->add(e) ) {
                 p->close();
-                ASSERT_TRUE(s1->commit(vespalib::ConstBufferRef(p->getHandle().c_str(), p->getHandle().size())));
+                ASSERT_TRUE(s1->commit(vespalib::ConstBufferRef(p->getHandle().data(), p->getHandle().size())));
                 p.reset(new Packet());
                 ASSERT_TRUE(p->add(e));
             }
         }
         p->close();
-        ASSERT_TRUE(s1->commit(vespalib::ConstBufferRef(p->getHandle().c_str(), p->getHandle().size())));
+        ASSERT_TRUE(s1->commit(vespalib::ConstBufferRef(p->getHandle().data(), p->getHandle().size())));
     }
 }
 
@@ -382,13 +382,13 @@ Test::fillDomainTest(TransLogClient::Session * s1,
             Packet::Entry e(value+1, j+1, vespalib::ConstBufferRef((const char *)&entryBuffer[0], entryBuffer.size()));
             if ( ! p->add(e) ) {
                 p->close();
-                ASSERT_TRUE(s1->commit(vespalib::ConstBufferRef(p->getHandle().c_str(), p->getHandle().size())));
+                ASSERT_TRUE(s1->commit(vespalib::ConstBufferRef(p->getHandle().data(), p->getHandle().size())));
                 p.reset(new Packet());
                 ASSERT_TRUE(p->add(e));
             }
         }
         p->close();
-        ASSERT_TRUE(s1->commit(vespalib::ConstBufferRef(p->getHandle().c_str(), p->getHandle().size())));
+        ASSERT_TRUE(s1->commit(vespalib::ConstBufferRef(p->getHandle().data(), p->getHandle().size())));
     }
 }
 
diff --git a/searchlib/src/tests/transactionlogstress/translogstress.cpp b/searchlib/src/tests/transactionlogstress/translogstress.cpp
index 76587d78b69..74e48081e17 100644
--- a/searchlib/src/tests/transactionlogstress/translogstress.cpp
+++ b/searchlib/src/tests/transactionlogstress/translogstress.cpp
@@ -118,11 +118,11 @@ EntryGenerator::getRandomEntry(SerialNum num)
     if (_buffers != NULL) {
         size_t i = _rnd.lrand48() % _buffers->size();
         const nbostream& buffer = (*_buffers)[i];
-        return Packet::Entry(num, 1024, ConstBufferRef(buffer.c_str(), buffer.size()));
+        return Packet::Entry(num, 1024, ConstBufferRef(buffer.data(), buffer.size()));
     } else {
         _bufferGenerator.setSeed(_baseSeed + num);
         _lastGeneratedBuffer = _bufferGenerator.getRandomBuffer();
-        return Packet::Entry(num, 1024, ConstBufferRef(_lastGeneratedBuffer.c_str(), _lastGeneratedBuffer.size()));
+        return Packet::Entry(num, 1024, ConstBufferRef(_lastGeneratedBuffer.data(), _lastGeneratedBuffer.size()));
     }
 }
 
@@ -225,7 +225,7 @@ FeederThread::commitPacket()
 {
     _packet.close();
     const vespalib::nbostream& stream = _packet.getHandle();
-    if (!_session->commit(ConstBufferRef(stream.c_str(), stream.size()))) {
+    if (!_session->commit(ConstBufferRef(stream.data(), stream.size()))) {
         throw std::runtime_error(vespalib::make_string
                                  ("FeederThread: Failed commiting %s", PacketPrinter::toStr(_packet).c_str()));
     } else {
diff --git a/searchlib/src/vespa/searchlib/docstore/chunk.cpp b/searchlib/src/vespa/searchlib/docstore/chunk.cpp
index 4707e8001a8..c7976fd15ae 100644
--- a/searchlib/src/vespa/searchlib/docstore/chunk.cpp
+++ b/searchlib/src/vespa/searchlib/docstore/chunk.cpp
@@ -89,13 +89,13 @@ Chunk::getLid(uint32_t lid) const
         if (it->getLid() == lid) {
 #if 1
             uint32_t bLid(0), bLen(0);
-            vespalib::nbostream is(getData().c_str()+it->getOffset(), it->size());
+            vespalib::nbostream is(getData().data() + it->getOffset(), it->size());
             is >> bLid >> bLen;
             assert(bLid == lid);
             assert(bLen == it->netSize());
             assert((bLen + 2*sizeof(uint32_t)) == it->size());
 #endif
-            buf = vespalib::ConstBufferRef(getData().c_str() + it->getNetOffset(), it->netSize());
+            buf = vespalib::ConstBufferRef(getData().data() + it->getNetOffset(), it->netSize());
         }
     }
     return buf;
diff --git a/searchlib/src/vespa/searchlib/docstore/chunkformat.cpp b/searchlib/src/vespa/searchlib/docstore/chunkformat.cpp
index 4d76b3fea25..a5bed4c33ce 100644
--- a/searchlib/src/vespa/searchlib/docstore/chunkformat.cpp
+++ b/searchlib/src/vespa/searchlib/docstore/chunkformat.cpp
@@ -33,7 +33,7 @@ ChunkFormat::pack(uint64_t lastSerial, vespalib::DataBuffer & compressed, const
     const size_t oldPos(compressed.getDataLen());
     compressed.writeInt8(compression.type);
     compressed.writeInt32(os.size());
-    CompressionConfig::Type type(compress(compression, vespalib::ConstBufferRef(os.c_str(), os.size()), compressed, false));
+    CompressionConfig::Type type(compress(compression, vespalib::ConstBufferRef(os.data(), os.size()), compressed, false));
     if (compression.type != type) {
         compressed.getData()[oldPos] = type;
     }
diff --git a/searchlib/src/vespa/searchlib/docstore/visitcache.cpp b/searchlib/src/vespa/searchlib/docstore/visitcache.cpp
index 994df3237f2..e8504480b7d 100644
--- a/searchlib/src/vespa/searchlib/docstore/visitcache.cpp
+++ b/searchlib/src/vespa/searchlib/docstore/visitcache.cpp
@@ -66,7 +66,7 @@ BlobSet::get(uint32_t lid) const
     ConstBufferRef buf;
     for (LidPosition pos : _positions) {
         if (pos.lid() == lid) {
-            buf = ConstBufferRef(_buffer.c_str() + pos.offset(), pos.size());
+            buf = ConstBufferRef(_buffer.data() + pos.offset(), pos.size());
             break;
         }
     }
diff --git a/searchlib/src/vespa/searchlib/docstore/visitcache.h b/searchlib/src/vespa/searchlib/docstore/visitcache.h
index eb035ac2a2c..8a06794ee35 100644
--- a/searchlib/src/vespa/searchlib/docstore/visitcache.h
+++ b/searchlib/src/vespa/searchlib/docstore/visitcache.h
@@ -60,7 +60,7 @@ public:
     void remove(uint32_t lid);
     const Positions & getPositions() const { return _positions; }
     vespalib::ConstBufferRef get(uint32_t lid) const;
-    vespalib::ConstBufferRef getBuffer() const { return vespalib::ConstBufferRef(_buffer.c_str(), _buffer.size()); }
+    vespalib::ConstBufferRef getBuffer() const { return vespalib::ConstBufferRef(_buffer.data(), _buffer.size()); }
 private:
     Positions           _positions;
     vespalib::nbostream _buffer;
diff --git a/searchlib/src/vespa/searchlib/docstore/writeablefilechunk.cpp b/searchlib/src/vespa/searchlib/docstore/writeablefilechunk.cpp
index e802ec0a326..70295d81a93 100644
--- a/searchlib/src/vespa/searchlib/docstore/writeablefilechunk.cpp
+++ b/searchlib/src/vespa/searchlib/docstore/writeablefilechunk.cpp
@@ -867,13 +867,13 @@ WriteableFileChunk::unconditionallyFlushPendingChunks(const vespalib::LockGuard
             _pendingDat -= pc.getDataLen();
             lastSerial = pc.getLastSerial();
             const nbostream &os2(pc.getSerializedIdx());
-            os.write(os2.c_str(), os2.size());
+            os.write(os2.data(), os2.size());
         }
     }
     vespalib::system_time timeStamp(vespalib::system_clock::now());
     auto idxFile = openIdx();
     idxFile->SetPosition(idxFile->GetSize());
-    ssize_t wlen = idxFile->Write2(os.c_str(), os.size());
+    ssize_t wlen = idxFile->Write2(os.data(), os.size());
     updateCurrentDiskFootprint();
 
     if (wlen != static_cast<ssize_t>(os.size())) {
diff --git a/searchlib/src/vespa/searchlib/expression/functionnodes.cpp b/searchlib/src/vespa/searchlib/expression/functionnodes.cpp
index 0eb85cba4ba..b770b9ffc9d 100644
--- a/searchlib/src/vespa/searchlib/expression/functionnodes.cpp
+++ b/searchlib/src/vespa/searchlib/expression/functionnodes.cpp
@@ -489,7 +489,7 @@ bool CatFunctionNode::onExecute() const
         getArg(i).execute();
         getArg(i).getResult().serialize(nos);
     }
-    static_cast<RawResultNode &>(updateResult()).setBuffer(os.c_str(), os.size());
+    static_cast<RawResultNode &>(updateResult()).setBuffer(os.data(), os.size());
     return true;
 }
 
@@ -520,14 +520,14 @@ bool XorBitFunctionNode::internalExecute(const nbostream & os) const
 {
     const size_t numBytes(_tmpXor.size());
     memset(&_tmpXor[0], 0, numBytes);
-    const char * s(os.c_str());
+    const char * s(os.data());
     for (size_t i(0), m(os.size()/numBytes); i < m; i++) {
         for (size_t j(0), k(numBytes); j < k; j++) {
             _tmpXor[j] ^= s[j + k*i];
         }
     }
     for (size_t i((os.size()/numBytes)*numBytes); i < os.size(); i++) {
-        _tmpXor[i%numBytes] = os.c_str()[i];
+        _tmpXor[i%numBytes] = os.data()[i];
     }
     static_cast<RawResultNode &>(updateResult()).setBuffer(&_tmpXor[0], numBytes);
     return true;
@@ -537,7 +537,7 @@ bool MD5BitFunctionNode::internalExecute(const nbostream & os) const
 {
     const unsigned int MD5_DIGEST_LENGTH = 16;
     unsigned char md5ScratchPad[MD5_DIGEST_LENGTH];
-    fastc_md5sum(os.c_str(), os.size(), md5ScratchPad);
+    fastc_md5sum(os.data(), os.size(), md5ScratchPad);
     static_cast<RawResultNode &>(updateResult()).setBuffer(md5ScratchPad, std::min(sizeof(md5ScratchPad), getNumBytes()));
     return true;
 }
diff --git a/searchlib/src/vespa/searchlib/transactionlog/common.cpp b/searchlib/src/vespa/searchlib/transactionlog/common.cpp
index a84e27b2e53..a5eaa61af12 100644
--- a/searchlib/src/vespa/searchlib/transactionlog/common.cpp
+++ b/searchlib/src/vespa/searchlib/transactionlog/common.cpp
@@ -37,7 +37,7 @@ Packet::Packet(const void * buf, size_t sz) :
      _limit(sz),
      _buf(static_cast<const char *>(buf), sz)
 {
-    nbostream_longlivedbuf os(_buf.c_str(), sz);
+    nbostream_longlivedbuf os(_buf.data(), sz);
     while ( os.size() > 0 ) {
         Entry e;
         e.deserialize(os);
@@ -55,7 +55,7 @@ bool Packet::merge(const Packet & packet)
     if (retval) {
         _count += packet._count;
         _range.to(packet._range.to());
-        _buf.write(packet.getHandle().c_str(), packet.getHandle().size());
+        _buf.write(packet.getHandle().data(), packet.getHandle().size());
     }
     return retval;
 }
diff --git a/searchlib/src/vespa/searchlib/transactionlog/domain.cpp b/searchlib/src/vespa/searchlib/transactionlog/domain.cpp
index fc9518ccf1b..5a64d829183 100644
--- a/searchlib/src/vespa/searchlib/transactionlog/domain.cpp
+++ b/searchlib/src/vespa/searchlib/transactionlog/domain.cpp
@@ -282,7 +282,7 @@ void waitPendingSync(vespalib::Monitor &syncMonitor, bool &pendingSync)
 void Domain::commit(const Packet & packet)
 {
     DomainPart::SP dp(_parts.rbegin()->second);
-    vespalib::nbostream_longlivedbuf is(packet.getHandle().c_str(), packet.getHandle().size());
+    vespalib::nbostream_longlivedbuf is(packet.getHandle().data(), packet.getHandle().size());
     Packet::Entry entry;
     entry.deserialize(is);
     if (dp->byteSize() > _domainPartSize) {
diff --git a/searchlib/src/vespa/searchlib/transactionlog/domainpart.cpp b/searchlib/src/vespa/searchlib/transactionlog/domainpart.cpp
index d2838711a51..8a6e833bd1f 100644
--- a/searchlib/src/vespa/searchlib/transactionlog/domainpart.cpp
+++ b/searchlib/src/vespa/searchlib/transactionlog/domainpart.cpp
@@ -403,7 +403,7 @@ void
 DomainPart::commit(SerialNum firstSerial, const Packet &packet)
 {
     int64_t firstPos(_transLog->GetPosition());
-    nbostream_longlivedbuf h(packet.getHandle().c_str(), packet.getHandle().size());
+    nbostream_longlivedbuf h(packet.getHandle().data(), packet.getHandle().size());
     if (_range.from() == 0) {
         _range.from(firstSerial);
     }
@@ -495,7 +495,7 @@ DomainPart::visit(SerialNumRange &r, Packet &packet)
                 }
             } else {
                 const nbostream & tmp = start->second.getHandle();
-                nbostream_longlivedbuf h(tmp.c_str(), tmp.size());
+                nbostream_longlivedbuf h(tmp.data(), tmp.size());
                 LOG(debug, "Visit partial[%" PRIu64 ", %" PRIu64 "] (%zd, %zd, %zd)",
                            start->second.range().from(), start->second.range().to(), h.rp(), h.size(), h.capacity());
                 Packet newPacket(h.size());
@@ -585,13 +585,13 @@ DomainPart::write(FastOS_FileInterface &file, const Packet::Entry &entry)
     size_t start(os.size());
     entry.serialize(os);
     size_t end(os.size());
-    crc = calcCrc(_defaultCrc, os.c_str()+start, end - start);
+    crc = calcCrc(_defaultCrc, os.data() + start, end - start);
     os << crc;
     size_t osSize = os.size();
     assert(osSize == len + sizeof(len) + sizeof(uint8_t));
 
     LockGuard guard(_writeLock);
-    if ( ! file.CheckedWrite(os.c_str(), osSize) ) {
+    if ( ! file.CheckedWrite(os.data(), osSize) ) {
         throw runtime_error(handleWriteError("Failed writing the entry.", file, lastKnownGoodPos, entry, end - start));
     }
     _writtenSerial = entry.serial();
diff --git a/searchlib/src/vespa/searchlib/transactionlog/translogserver.cpp b/searchlib/src/vespa/searchlib/transactionlog/translogserver.cpp
index 37903bc21f5..a3528c4f615 100644
--- a/searchlib/src/vespa/searchlib/transactionlog/translogserver.cpp
+++ b/searchlib/src/vespa/searchlib/transactionlog/translogserver.cpp
@@ -366,7 +366,7 @@ public:
         req->SetMethodName("visitCallback");
         req->GetParams()->AddString(domain.c_str());
         req->GetParams()->AddInt32(id);
-        req->GetParams()->AddData(packet.getHandle().c_str(), packet.getHandle().size());
+        req->GetParams()->AddData(packet.getHandle().data(), packet.getHandle().size());
         return send(req);
     }
 
diff --git a/staging_vespalib/src/tests/objects/identifiable_test.cpp b/staging_vespalib/src/tests/objects/identifiable_test.cpp
index b952ad18333..2b4d50cc786 100644
--- a/staging_vespalib/src/tests/objects/identifiable_test.cpp
+++ b/staging_vespalib/src/tests/objects/identifiable_test.cpp
@@ -161,40 +161,40 @@ void IdentifiableTest::testNboStream()
         EXPECT_EQUAL(nbostream::ok, s.state());
         EXPECT_EQUAL(10u, s.size());
         EXPECT_EQUAL(16u, s.capacity());
-        EXPECT_EQUAL(0, strncmp(s.c_str()+4, "abcdef", 6));
+        EXPECT_EQUAL(0, strncmp(s.data() + 4, "abcdef", 6));
     }
     {
         nbostream s(8);
         EXPECT_EQUAL(0u, s.size());
         EXPECT_EQUAL(8u, s.capacity());
-        const char * prev = s.c_str();
+        const char * prev = s.data();
         s << "ABCD";
         EXPECT_EQUAL(8u, s.size());
         EXPECT_EQUAL(8u, s.capacity());
-        EXPECT_EQUAL(prev, s.c_str());
+        EXPECT_EQUAL(prev, s.data());
         s << "A long string that will cause resizing";
         EXPECT_EQUAL(50u, s.size());
         EXPECT_EQUAL(64u, s.capacity());
-        EXPECT_NOT_EQUAL(prev, s.c_str());
+        EXPECT_NOT_EQUAL(prev, s.data());
     }
     {
         nbostream s(8);
         EXPECT_EQUAL(0u, s.size());
         EXPECT_EQUAL(8u, s.capacity());
-        const char * prev = s.c_str();
+        const char * prev = s.data();
         s << "ABCD";
         EXPECT_EQUAL(8u, s.size());
         EXPECT_EQUAL(8u, s.capacity());
-        EXPECT_EQUAL(prev, s.c_str());
+        EXPECT_EQUAL(prev, s.data());
         s.reserve(50);
-        EXPECT_NOT_EQUAL(prev, s.c_str());
+        EXPECT_NOT_EQUAL(prev, s.data());
         EXPECT_EQUAL(8u, s.size());
         EXPECT_EQUAL(64u, s.capacity());
-        prev = s.c_str();
+        prev = s.data();
         s << "A long string that will cause resizing";
         EXPECT_EQUAL(50u, s.size());
         EXPECT_EQUAL(64u, s.capacity());
-        EXPECT_EQUAL(prev, s.c_str());
+        EXPECT_EQUAL(prev, s.data());
     }
     {
         nbostream s;
diff --git a/staging_vespalib/src/vespa/vespalib/objects/identifiable.cpp b/staging_vespalib/src/vespa/vespalib/objects/identifiable.cpp
index 6cc2af1fc90..2465d5f9d9b 100644
--- a/staging_vespalib/src/vespa/vespalib/objects/identifiable.cpp
+++ b/staging_vespalib/src/vespa/vespalib/objects/identifiable.cpp
@@ -244,7 +244,7 @@ int Identifiable::onCmp(const Identifiable& b) const
     nbs << b;
     size_t minLength(std::min(as.size(), bs.size()));
     if (minLength > 0) {
-        diff = memcmp(as.c_str(), bs.c_str(), minLength);
+        diff = memcmp(as.data(), bs.data(), minLength);
     }
     if (diff == 0) {
         diff = as.size() - bs.size();
diff --git a/streamingvisitors/src/vespa/searchvisitor/searchvisitor.cpp b/streamingvisitors/src/vespa/searchvisitor/searchvisitor.cpp
index 94026ffaa19..eb1cc7f0256 100644
--- a/streamingvisitors/src/vespa/searchvisitor/searchvisitor.cpp
+++ b/streamingvisitors/src/vespa/searchvisitor/searchvisitor.cpp
@@ -1108,7 +1108,7 @@ SearchVisitor::generateGroupingResults()
         vespalib::NBOSerializer nos(os);
         grouping.serialize(nos);
         vespalib::MallocPtr blob(os.size());
-        memcpy(blob, os.c_str(), os.size());
+        memcpy(blob, os.data(), os.size());
         searchResult.getGroupingList().add(grouping.getId(), blob);
     }
 }
diff --git a/vespalib/src/vespa/vespalib/objects/nbostream.h b/vespalib/src/vespa/vespalib/objects/nbostream.h
index 3109295fbdc..daaea981b5a 100644
--- a/vespalib/src/vespa/vespalib/objects/nbostream.h
+++ b/vespalib/src/vespa/vespalib/objects/nbostream.h
@@ -141,7 +141,7 @@ public:
     size_t size() const { return left(); }
     size_t capacity() const { return _wbuf.size(); }
     bool empty()  const { return size() == 0; }
-    const char * c_str() const { return &_rbuf[0]; }
+    const char * data() const { return &_rbuf[0]; }
     const char * peek() const { return &_rbuf[_rp]; }
     size_t rp() const { return _rp; }
     nbostream & rp(size_t pos) { if (pos > _wp) fail(eof); _rp = pos; return *this; }