SERVER-41071 Replace more NULLs with nullptr

30 files changed, 134 insertions, 133 deletions

diff --git a/src/mongo/base/checked_cast.h b/src/mongo/base/checked_cast.h
index 074b432fab7..df62cd41b3b 100644
--- a/src/mongo/base/checked_cast.h
+++ b/src/mongo/base/checked_cast.h
@@ -61,7 +61,7 @@ struct checked_cast_impl<true> {
     template <typename T, typename U>
     static T cast(U* u) {
         if (!u) {
-            return NULL;
+            return nullptr;
         }
         T t = dynamic_cast<T>(u);
         invariant(t);
diff --git a/src/mongo/client/cyrus_sasl_client_session.cpp b/src/mongo/client/cyrus_sasl_client_session.cpp
index 36d7d588142..e6ddd6e3a7f 100644
--- a/src/mongo/client/cyrus_sasl_client_session.cpp
+++ b/src/mongo/client/cyrus_sasl_client_session.cpp
@@ -136,7 +136,7 @@ MONGO_INITIALIZER_WITH_PREREQUISITES(CyrusSaslClientContext,
                                      ("NativeSaslClientContext", "CyrusSaslAllocatorsAndMutexes"))
 (InitializerContext* context) {
     static sasl_callback_t saslClientGlobalCallbacks[] = {
-        {SASL_CB_LOG, SaslCallbackFn(saslClientLogSwallow), NULL /* context */},
+        {SASL_CB_LOG, SaslCallbackFn(saslClientLogSwallow), nullptr /* context */},
         {SASL_CB_LIST_END}};
 
     // If the client application has previously called sasl_client_init(), the callbacks passed
@@ -147,7 +147,7 @@ MONGO_INITIALIZER_WITH_PREREQUISITES(CyrusSaslClientContext,
     if (result != SASL_OK) {
         return Status(ErrorCodes::UnknownError,
                       str::stream() << "Could not initialize sasl client components ("
-                                    << sasl_errstring(result, NULL, NULL)
+                                    << sasl_errstring(result, nullptr, nullptr)
                                     << ")");
     }
 
@@ -204,7 +204,7 @@ int saslClientGetPassword(sasl_conn_t* conn,
             return SASL_BADPARAM;
 
         sasl_secret_t* secret = session->getPasswordAsSecret();
-        if (secret == NULL) {
+        if (secret == nullptr) {
             saslSetError(conn, "No password data provided");
             return SASL_FAIL;
         }
@@ -221,7 +221,7 @@ int saslClientGetPassword(sasl_conn_t* conn,
 }  // namespace
 
 CyrusSaslClientSession::CyrusSaslClientSession()
-    : SaslClientSession(), _saslConnection(NULL), _step(0), _success(false) {
+    : SaslClientSession(), _saslConnection(nullptr), _step(0), _success(false) {
     const sasl_callback_t callbackTemplate[maxCallbacks] = {
         {SASL_CB_AUTHNAME, SaslCallbackFn(saslClientGetSimple), this},
         {SASL_CB_USER, SaslCallbackFn(saslClientGetSimple), this},
@@ -254,28 +254,28 @@ sasl_secret_t* CyrusSaslClientSession::getPasswordAsSecret() {
 }
 
 Status CyrusSaslClientSession::initialize() {
-    if (_saslConnection != NULL)
+    if (_saslConnection != nullptr)
         return Status(ErrorCodes::AlreadyInitialized,
                       "Cannot reinitialize CyrusSaslClientSession.");
 
     int result = sasl_client_new(getParameter(parameterServiceName).toString().c_str(),
                                  getParameter(parameterServiceHostname).toString().c_str(),
-                                 NULL,
-                                 NULL,
+                                 nullptr,
+                                 nullptr,
                                  _callbacks,
                                  0,
                                  &_saslConnection);
 
     if (SASL_OK != result) {
         return Status(ErrorCodes::UnknownError,
-                      str::stream() << sasl_errstring(result, NULL, NULL));
+                      str::stream() << sasl_errstring(result, nullptr, nullptr));
     }
 
     return Status::OK();
 }
 
 Status CyrusSaslClientSession::step(StringData inputData, std::string* outputData) {
-    const char* output = NULL;
+    const char* output = nullptr;
     unsigned outputSize = 0xFFFFFFFF;
 
     int result;
@@ -283,7 +283,7 @@ Status CyrusSaslClientSession::step(StringData inputData, std::string* outputDat
         const char* actualMechanism;
         result = sasl_client_start(_saslConnection,
                                    getParameter(parameterMechanism).toString().c_str(),
-                                   NULL,
+                                   nullptr,
                                    &output,
                                    &outputSize,
                                    &actualMechanism);
@@ -291,7 +291,7 @@ Status CyrusSaslClientSession::step(StringData inputData, std::string* outputDat
         result = sasl_client_step(_saslConnection,
                                   inputData.rawData(),
                                   static_cast<unsigned>(inputData.size()),
-                                  NULL,
+                                  nullptr,
                                   &output,
                                   &outputSize);
     }
diff --git a/src/mongo/client/sasl_sspi.cpp b/src/mongo/client/sasl_sspi.cpp
index fa011a458a0..b917b016844 100644
--- a/src/mongo/client/sasl_sspi.cpp
+++ b/src/mongo/client/sasl_sspi.cpp
@@ -89,12 +89,12 @@ void HandleLastError(const sasl_utils_t* utils, DWORD errCode, const char* msg)
     char* err;
     if (!FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
                             FORMAT_MESSAGE_IGNORE_INSERTS,
-                        NULL,
+                        nullptr,
                         errCode,
                         MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                         (LPSTR)&err,
                         0,
-                        NULL)) {
+                        nullptr)) {
         return;
     }
 
@@ -150,10 +150,10 @@ int sspiClientMechNew(void* glob_context,
 
     // Fetch password, if available.
     authIdentity.PasswordLength = 0;
-    authIdentity.Password = NULL;
+    authIdentity.Password = nullptr;
     std::wstring utf16Password;
 
-    sasl_secret_t* password = NULL;
+    sasl_secret_t* password = nullptr;
     sasl_getsecret_t* pass_cb;
     void* pass_context;
     ret = cparams->utils->getcallback(
@@ -174,13 +174,13 @@ int sspiClientMechNew(void* glob_context,
     std::unique_ptr<SspiConnContext> pcctx(new SspiConnContext());
     pcctx->userPlusRealm = userPlusRealm;
     TimeStamp ignored;
-    SECURITY_STATUS status = AcquireCredentialsHandleW(NULL,  // principal
+    SECURITY_STATUS status = AcquireCredentialsHandleW(nullptr,  // principal
                                                        const_cast<LPWSTR>(L"kerberos"),
                                                        SECPKG_CRED_OUTBOUND,
-                                                       NULL,           // LOGON id
+                                                       nullptr,        // LOGON id
                                                        &authIdentity,  // auth data
-                                                       NULL,           // get key fn
-                                                       NULL,           // get key arg
+                                                       nullptr,        // get key fn
+                                                       nullptr,        // get key arg
                                                        &pcctx->cred,
                                                        &ignored);
     if (status != SEC_E_OK) {
@@ -191,7 +191,7 @@ int sspiClientMechNew(void* glob_context,
     pcctx->haveCred = true;
 
     // Compose target name token. First, verify that a hostname has been provided.
-    if (cparams->serverFQDN == NULL || strlen(cparams->serverFQDN) == 0) {
+    if (cparams->serverFQDN == nullptr || strlen(cparams->serverFQDN) == 0) {
         saslSetError(cparams->utils, "SSPI: no serverFQDN");
         return SASL_FAIL;
     }
@@ -246,9 +246,9 @@ int sspiValidateServerSecurityLayerOffering(SspiConnContext* pcctx,
 
     wrapBufs[1].cbBuffer = 0;
     wrapBufs[1].BufferType = SECBUFFER_DATA;
-    wrapBufs[1].pvBuffer = NULL;
+    wrapBufs[1].pvBuffer = nullptr;
 
-    SECURITY_STATUS status = DecryptMessage(&pcctx->ctx, &wrapBufDesc, 0, NULL);
+    SECURITY_STATUS status = DecryptMessage(&pcctx->ctx, &wrapBufDesc, 0, nullptr);
     if (status != SEC_E_OK) {
         HandleLastError(cparams->utils, status, "DecryptMessage");
         return SASL_FAIL;
@@ -359,7 +359,7 @@ int sspiClientMechStep(void* conn_context,
                        unsigned* clientoutlen,
                        sasl_out_params_t* oparams) throw() {
     SspiConnContext* pcctx = static_cast<SspiConnContext*>(conn_context);
-    *clientout = NULL;
+    *clientout = nullptr;
     *clientoutlen = 0;
 
     if (pcctx->authComplete) {
@@ -386,24 +386,24 @@ int sspiClientMechStep(void* conn_context,
     outbuf.ulVersion = SECBUFFER_VERSION;
     outbuf.cBuffers = 1;
     outbuf.pBuffers = outBufs;
-    outBufs[0].pvBuffer = NULL;
+    outBufs[0].pvBuffer = nullptr;
     outBufs[0].cbBuffer = 0;
     outBufs[0].BufferType = SECBUFFER_TOKEN;
 
     ULONG contextAttr = 0;
     SECURITY_STATUS status =
         InitializeSecurityContextW(&pcctx->cred,
-                                   pcctx->haveCtxt ? &pcctx->ctx : NULL,
+                                   pcctx->haveCtxt ? &pcctx->ctx : nullptr,
                                    const_cast<wchar_t*>(pcctx->nameToken.c_str()),
                                    ISC_REQ_ALLOCATE_MEMORY | ISC_REQ_MUTUAL_AUTH,
                                    0,
                                    SECURITY_NETWORK_DREP,
-                                   (pcctx->haveCtxt ? &inbuf : NULL),
+                                   (pcctx->haveCtxt ? &inbuf : nullptr),
                                    0,
                                    &pcctx->ctx,
                                    &outbuf,
                                    &contextAttr,
-                                   NULL);
+                                   nullptr);
 
     if (status != SEC_E_OK && status != SEC_I_CONTINUE_NEEDED) {
         HandleLastError(cparams->utils, status, "InitializeSecurityContext");
@@ -415,7 +415,7 @@ int sspiClientMechStep(void* conn_context,
 
     if (status == SEC_E_OK) {
         // Send back nothing and wait for the server to reply with the security capabilities
-        *clientout = NULL;
+        *clientout = nullptr;
         *clientoutlen = 0;
         pcctx->authComplete = true;
         return SASL_CONTINUE;
@@ -443,15 +443,15 @@ sasl_client_plug_t sspiClientPlugin[] = {
          SASL_SEC_NOACTIVE | SASL_SEC_NOANONYMOUS | SASL_SEC_MUTUAL_AUTH |
          SASL_SEC_PASS_CREDENTIALS, /* security_flags */
      SASL_FEAT_NEEDSERVERFQDN | SASL_FEAT_WANT_CLIENT_FIRST | SASL_FEAT_ALLOWS_PROXY,
-     NULL, /* required prompt ids, NULL = user/pass only */
-     NULL, /* global state for mechanism */
+     nullptr, /* required prompt ids, nullptr = user/pass only */
+     nullptr, /* global state for mechanism */
      sspiClientMechNew,
      sspiClientMechStep,
      sspiClientMechDispose,
      sspiClientMechFree,
-     NULL,
-     NULL,
-     NULL}};
+     nullptr,
+     nullptr,
+     nullptr}};
 
 int sspiClientPluginInit(const sasl_utils_t* utils,
                          int max_version,
@@ -483,7 +483,7 @@ MONGO_INITIALIZER_WITH_PREREQUISITES(SaslSspiClientPlugin,
         return Status(ErrorCodes::UnknownError,
                       str::stream() << "could not add SASL Client SSPI plugin " << sspiPluginName
                                     << ": "
-                                    << sasl_errstring(ret, NULL, NULL));
+                                    << sasl_errstring(ret, nullptr, nullptr));
     }
 
     return Status::OK();
@@ -497,7 +497,7 @@ MONGO_INITIALIZER_WITH_PREREQUISITES(SaslPlainClientPlugin,
         return Status(ErrorCodes::UnknownError,
                       str::stream() << "Could not add SASL Client PLAIN plugin " << sspiPluginName
                                     << ": "
-                                    << sasl_errstring(ret, NULL, NULL));
+                                    << sasl_errstring(ret, nullptr, nullptr));
     }
 
     return Status::OK();
diff --git a/src/mongo/db/exec/geo_near.cpp b/src/mongo/db/exec/geo_near.cpp
index 5fa04b917db..f3f08bd3be8 100644
--- a/src/mongo/db/exec/geo_near.cpp
+++ b/src/mongo/db/exec/geo_near.cpp
@@ -595,7 +595,7 @@ StatusWith<NearStage::CoveredInterval*>  //
                                  const Collection* collection) {
     // The search is finished if we searched at least once and all the way to the edge
     if (_currBounds.getInner() >= 0 && _currBounds.getOuter() == _fullBounds.getOuter()) {
-        return StatusWith<CoveredInterval*>(NULL);
+        return StatusWith<CoveredInterval*>(nullptr);
     }
 
     //
@@ -1015,7 +1015,7 @@ StatusWith<NearStage::CoveredInterval*>  //
                                        const Collection* collection) {
     // The search is finished if we searched at least once and all the way to the edge
     if (_currBounds.getInner() >= 0 && _currBounds.getOuter() == _fullBounds.getOuter()) {
-        return StatusWith<CoveredInterval*>(NULL);
+        return StatusWith<CoveredInterval*>(nullptr);
     }
 
     //
diff --git a/src/mongo/db/exec/near.cpp b/src/mongo/db/exec/near.cpp
index 1b56d9838e0..91a3a60317a 100644
--- a/src/mongo/db/exec/near.cpp
+++ b/src/mongo/db/exec/near.cpp
@@ -146,7 +146,7 @@ PlanStage::StageState NearStage::bufferNext(WorkingSetID* toReturn, Status* erro
             return PlanStage::FAILURE;
         }
 
-        if (NULL == intervalStatus.getValue()) {
+        if (nullptr == intervalStatus.getValue()) {
             _searchState = SearchState_Finished;
             return PlanStage::IS_EOF;
         }
diff --git a/src/mongo/db/repl/isself.cpp b/src/mongo/db/repl/isself.cpp
index f864cbb13de..13df4f52b5f 100644
--- a/src/mongo/db/repl/isself.cpp
+++ b/src/mongo/db/repl/isself.cpp
@@ -275,7 +275,7 @@ std::vector<std::string> getBoundAddrs(const bool ipv6enabled) {
                                    GAA_FLAG_SKIP_ANYCAST |  // only want unicast addrs
                                        GAA_FLAG_SKIP_MULTICAST |
                                        GAA_FLAG_SKIP_DNS_SERVER,
-                                   NULL,
+                                   nullptr,
                                    adapters,
                                    &adaptersLen);
 
@@ -293,8 +293,8 @@ std::vector<std::string> getBoundAddrs(const bool ipv6enabled) {
         return out;
     }
 
-    for (IP_ADAPTER_ADDRESSES* adapter = adapters; adapter != NULL; adapter = adapter->Next) {
-        for (IP_ADAPTER_UNICAST_ADDRESS* addr = adapter->FirstUnicastAddress; addr != NULL;
+    for (IP_ADAPTER_ADDRESSES* adapter = adapters; adapter != nullptr; adapter = adapter->Next) {
+        for (IP_ADAPTER_UNICAST_ADDRESS* addr = adapter->FirstUnicastAddress; addr != nullptr;
              addr = addr->Next) {
             short family = reinterpret_cast<SOCKADDR_STORAGE*>(addr->Address.lpSockaddr)->ss_family;
 
diff --git a/src/mongo/db/server_options_helpers.cpp b/src/mongo/db/server_options_helpers.cpp
index 01c0f1c0c8c..bc0a1eddc04 100644
--- a/src/mongo/db/server_options_helpers.cpp
+++ b/src/mongo/db/server_options_helpers.cpp
@@ -91,7 +91,7 @@ CODE facilitynames[] = {{"auth", LOG_AUTH},     {"cron", LOG_CRON},     {"daemon
                         {"syslog", LOG_SYSLOG}, {"user", LOG_USER},     {"uucp", LOG_UUCP},
                         {"local0", LOG_LOCAL0}, {"local1", LOG_LOCAL1}, {"local2", LOG_LOCAL2},
                         {"local3", LOG_LOCAL3}, {"local4", LOG_LOCAL4}, {"local5", LOG_LOCAL5},
-                        {"local6", LOG_LOCAL6}, {"local7", LOG_LOCAL7}, {NULL, -1}};
+                        {"local6", LOG_LOCAL6}, {"local7", LOG_LOCAL7}, {nullptr, -1}};
 
 #endif  // !defined(INTERNAL_NOPRI)
 #endif  // defined(SYSLOG_NAMES)
diff --git a/src/mongo/db/storage/wiredtiger/wiredtiger_util.cpp b/src/mongo/db/storage/wiredtiger/wiredtiger_util.cpp
index fb424183586..0d2d8b7bd5e 100644
--- a/src/mongo/db/storage/wiredtiger/wiredtiger_util.cpp
+++ b/src/mongo/db/storage/wiredtiger/wiredtiger_util.cpp
@@ -337,7 +337,7 @@ StatusWith<int64_t> WiredTigerUtil::getStatisticsValue(WT_SESSION* session,
     }
 
     int64_t value;
-    ret = cursor->get_value(cursor, NULL, NULL, &value);
+    ret = cursor->get_value(cursor, nullptr, nullptr, &value);
     if (ret != 0) {
         return StatusWith<int64_t>(
             ErrorCodes::BadValue,
@@ -627,7 +627,7 @@ Status WiredTigerUtil::exportTableToBSON(WT_SESSION* session,
     std::map<string, BSONObjBuilder*> subs;
     const char* desc;
     uint64_t value;
-    while (c->next(c) == 0 && c->get_value(c, &desc, NULL, &value) == 0) {
+    while (c->next(c) == 0 && c->get_value(c, &desc, nullptr, &value) == 0) {
         StringData key(desc);
 
         StringData prefix;
diff --git a/src/mongo/dbtests/query_stage_near.cpp b/src/mongo/dbtests/query_stage_near.cpp
index 4af68aad624..df400c3bd1f 100644
--- a/src/mongo/dbtests/query_stage_near.cpp
+++ b/src/mongo/dbtests/query_stage_near.cpp
@@ -110,7 +110,7 @@ public:
                                                       WorkingSet* workingSet,
                                                       const Collection* collection) {
         if (_pos == static_cast<int>(_intervals.size()))
-            return StatusWith<CoveredInterval*>(NULL);
+            return StatusWith<CoveredInterval*>(nullptr);
 
         const MockInterval& interval = *_intervals[_pos++];
 
diff --git a/src/mongo/logger/console.cpp b/src/mongo/logger/console.cpp
index ce8c053779c..ebf8049ac71 100644
--- a/src/mongo/logger/console.cpp
+++ b/src/mongo/logger/console.cpp
@@ -174,7 +174,7 @@ private:
         while (unwrittenCount > 0) {
             DWORD written;
             BOOL success =
-                WriteConsoleW(_consoleHandle, unwrittenBegin, unwrittenCount, &written, NULL);
+                WriteConsoleW(_consoleHandle, unwrittenBegin, unwrittenCount, &written, nullptr);
             if (!success) {
                 return false;
             }
diff --git a/src/mongo/logger/rotatable_file_writer.cpp b/src/mongo/logger/rotatable_file_writer.cpp
index fa22a7f1e4a..a8bd27a0fc4 100644
--- a/src/mongo/logger/rotatable_file_writer.cpp
+++ b/src/mongo/logger/rotatable_file_writer.cpp
@@ -138,10 +138,10 @@ bool Win32FileStreambuf::open(StringData fileName, bool append) {
     _fileHandle = CreateFileW(utf8ToWide(fileName).c_str(),         // lpFileName
                               GENERIC_WRITE,                        // dwDesiredAccess
                               FILE_SHARE_DELETE | FILE_SHARE_READ,  // dwShareMode
-                              NULL,                                 // lpSecurityAttributes
+                              nullptr,                              // lpSecurityAttributes
                               OPEN_ALWAYS,                          // dwCreationDisposition
                               FILE_ATTRIBUTE_NORMAL,                // dwFlagsAndAttributes
-                              NULL                                  // hTemplateFile
+                              nullptr                               // hTemplateFile
                               );
 
 
@@ -152,11 +152,11 @@ bool Win32FileStreambuf::open(StringData fileName, bool append) {
     zero.QuadPart = 0LL;
 
     if (append) {
-        if (SetFilePointerEx(_fileHandle, zero, NULL, FILE_END)) {
+        if (SetFilePointerEx(_fileHandle, zero, nullptr, FILE_END)) {
             return true;
         }
     } else {
-        if (SetFilePointerEx(_fileHandle, zero, NULL, FILE_BEGIN) && SetEndOfFile(_fileHandle)) {
+        if (SetFilePointerEx(_fileHandle, zero, nullptr, FILE_BEGIN) && SetEndOfFile(_fileHandle)) {
             return true;
         }
     }
@@ -171,7 +171,7 @@ std::streamsize Win32FileStreambuf::xsputn(const char* s, std::streamsize count)
 
     while (count > totalBytesWritten) {
         DWORD bytesWritten;
-        if (!WriteFile(_fileHandle, s, count - totalBytesWritten, &bytesWritten, NULL)) {
+        if (!WriteFile(_fileHandle, s, count - totalBytesWritten, &bytesWritten, nullptr)) {
             break;
         }
 
diff --git a/src/mongo/platform/posix_fadvise.cpp b/src/mongo/platform/posix_fadvise.cpp
index cd4ed2c9ddb..689d5de94b0 100644
--- a/src/mongo/platform/posix_fadvise.cpp
+++ b/src/mongo/platform/posix_fadvise.cpp
@@ -57,7 +57,7 @@ int posix_fadvise(int fd, off_t offset, off_t len, int advice) {
 MONGO_INITIALIZER_GENERAL(SolarisPosixFadvise, MONGO_NO_PREREQUISITES, ("default"))
 (InitializerContext* context) {
     void* functionAddress = dlsym(RTLD_DEFAULT, "posix_fadvise");
-    if (functionAddress != NULL) {
+    if (functionAddress != nullptr) {
         mongo::pal::posix_fadvise_switcher =
             reinterpret_cast<mongo::pal::PosixFadviseFunc>(functionAddress);
     }
diff --git a/src/mongo/platform/strcasestr.cpp b/src/mongo/platform/strcasestr.cpp
index eacf9fc0773..a9c5a9ce09d 100644
--- a/src/mongo/platform/strcasestr.cpp
+++ b/src/mongo/platform/strcasestr.cpp
@@ -71,7 +71,7 @@ const char* STRCASESTR_EMULATION_NAME(const char* haystack, const char* needle)
     // If not found, return NULL
     const char* haystackLowerStart = haystackLower.c_str();
     const char* location = strstr(haystackLowerStart, needleLower.c_str());
-    return location ? (haystack + (location - haystackLowerStart)) : NULL;
+    return location ? (haystack + (location - haystackLowerStart)) : nullptr;
 }
 
 #if defined(__sun)
@@ -99,7 +99,7 @@ namespace mongo {
 MONGO_INITIALIZER_GENERAL(SolarisStrCaseCmp, MONGO_NO_PREREQUISITES, ("default"))
 (InitializerContext* context) {
     void* functionAddress = dlsym(RTLD_DEFAULT, "strcasestr");
-    if (functionAddress != NULL) {
+    if (functionAddress != nullptr) {
         mongo::pal::strcasestr_switcher =
             reinterpret_cast<mongo::pal::StrCaseStrFunc>(functionAddress);
     }
diff --git a/src/mongo/shell/dbshell.cpp b/src/mongo/shell/dbshell.cpp
index 4282d05a525..1a5018cf499 100644
--- a/src/mongo/shell/dbshell.cpp
+++ b/src/mongo/shell/dbshell.cpp
@@ -780,7 +780,7 @@ int _main(int argc, char* argv[], char** envp) {
     rcGlobalLocation = "/etc/mongorc.js";
 #else
     wchar_t programDataPath[MAX_PATH];
-    if (S_OK == SHGetFolderPathW(NULL, CSIDL_COMMON_APPDATA, NULL, 0, programDataPath)) {
+    if (S_OK == SHGetFolderPathW(nullptr, CSIDL_COMMON_APPDATA, nullptr, 0, programDataPath)) {
         rcGlobalLocation = str::stream() << toUtf8String(programDataPath)
                                          << "\\MongoDB\\mongorc.js";
     }
@@ -861,7 +861,7 @@ int _main(int argc, char* argv[], char** envp) {
             if (getenv("HOME") != nullptr)
                 rcLocation = str::stream() << getenv("HOME") << "/.mongorc.js";
 #else
-            if (getenv("HOMEDRIVE") != NULL && getenv("HOMEPATH") != NULL)
+            if (getenv("HOMEDRIVE") != nullptr && getenv("HOMEPATH") != nullptr)
                 rcLocation = str::stream() << toUtf8String(_wgetenv(L"HOMEDRIVE"))
                                            << toUtf8String(_wgetenv(L"HOMEPATH"))
                                            << "\\.mongorc.js";
diff --git a/src/mongo/shell/linenoise.cpp b/src/mongo/shell/linenoise.cpp
index f4fdc340e79..501103aae4a 100644
--- a/src/mongo/shell/linenoise.cpp
+++ b/src/mongo/shell/linenoise.cpp
@@ -2792,7 +2792,7 @@ mongo::Status linenoiseHistorySave(const char* filename) {
     }
 #else
     fp = fopen(filename, "wt");
-    if (fp == NULL) {
+    if (fp == nullptr) {
         const auto ewd = mongo::errnoWithDescription();
         return linenoiseFileError(mongo::ErrorCodes::FileOpenFailed, "fopen()", filename, ewd);
     }
diff --git a/src/mongo/shell/shell_utils_launcher.cpp b/src/mongo/shell/shell_utils_launcher.cpp
index c25acf297f7..60a78f9a38d 100644
--- a/src/mongo/shell/shell_utils_launcher.cpp
+++ b/src/mongo/shell/shell_utils_launcher.cpp
@@ -911,7 +911,7 @@ inline void kill_wrapper(ProcessId pid, int sig, int port, const BSONObj& opt) {
     std::string eventName = getShutdownSignalName(pid.asUInt32());
 
     HANDLE event = OpenEventA(EVENT_MODIFY_STATE, FALSE, eventName.c_str());
-    if (event == NULL) {
+    if (event == nullptr) {
         int gle = GetLastError();
         if (gle != ERROR_FILE_NOT_FOUND) {
             const auto ewd = errnoWithDescription();
diff --git a/src/mongo/util/concurrency/spin_lock.cpp b/src/mongo/util/concurrency/spin_lock.cpp
index d797d3cb762..cbd72e9f9d6 100644
--- a/src/mongo/util/concurrency/spin_lock.cpp
+++ b/src/mongo/util/concurrency/spin_lock.cpp
@@ -69,7 +69,7 @@ void SpinLock::_lockSlowPath() {
     t.tv_nsec = 5000000;
 
     while (!_tryLock()) {
-        nanosleep(&t, NULL);
+        nanosleep(&t, nullptr);
     }
 }
 
diff --git a/src/mongo/util/exception_filter_win32.cpp b/src/mongo/util/exception_filter_win32.cpp
index dfb631b1196..5f404d2bf8a 100644
--- a/src/mongo/util/exception_filter_win32.cpp
+++ b/src/mongo/util/exception_filter_win32.cpp
@@ -60,7 +60,7 @@ namespace {
 void doMinidumpWithException(struct _EXCEPTION_POINTERS* exceptionInfo) {
     WCHAR moduleFileName[MAX_PATH];
 
-    DWORD ret = GetModuleFileNameW(NULL, &moduleFileName[0], ARRAYSIZE(moduleFileName));
+    DWORD ret = GetModuleFileNameW(nullptr, &moduleFileName[0], ARRAYSIZE(moduleFileName));
     if (ret == 0) {
         int gle = GetLastError();
         log() << "GetModuleFileName failed " << errnoWithDescription(gle);
@@ -69,7 +69,7 @@ void doMinidumpWithException(struct _EXCEPTION_POINTERS* exceptionInfo) {
         wcscpy_s(moduleFileName, L"mongo");
     } else {
         WCHAR* dotStr = wcschr(&moduleFileName[0], L'.');
-        if (dotStr != NULL) {
+        if (dotStr != nullptr) {
             *dotStr = L'\0';
         }
     }
@@ -85,7 +85,7 @@ void doMinidumpWithException(struct _EXCEPTION_POINTERS* exceptionInfo) {
     dumpName += L".mdmp";
 
     HANDLE hFile = CreateFileW(
-        dumpName.c_str(), GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
+        dumpName.c_str(), GENERIC_WRITE, 0, nullptr, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, nullptr);
     if (INVALID_HANDLE_VALUE == hFile) {
         DWORD lasterr = GetLastError();
         log() << "failed to open minidump file " << toUtf8String(dumpName.c_str()) << " : "
@@ -111,9 +111,9 @@ void doMinidumpWithException(struct _EXCEPTION_POINTERS* exceptionInfo) {
                                      GetCurrentProcessId(),
                                      hFile,
                                      miniDumpType,
-                                     exceptionInfo != NULL ? &aMiniDumpInfo : NULL,
-                                     NULL,
-                                     NULL);
+                                     exceptionInfo != nullptr ? &aMiniDumpInfo : nullptr,
+                                     nullptr,
+                                     nullptr);
     if (FALSE == bstatus) {
         DWORD lasterr = GetLastError();
         log() << "failed to create minidump : " << errnoWithDescription(lasterr);
diff --git a/src/mongo/util/file.cpp b/src/mongo/util/file.cpp
index 6cb07dcba9b..9096a11b23e 100644
--- a/src/mongo/util/file.cpp
+++ b/src/mongo/util/file.cpp
@@ -66,9 +66,9 @@ File::~File() {
 intmax_t File::freeSpace(const std::string& path) {
     ULARGE_INTEGER avail;
     if (GetDiskFreeSpaceExW(toWideString(path.c_str()).c_str(),
-                            &avail,   // bytes available to caller
-                            NULL,     // ptr to returned total size
-                            NULL)) {  // ptr to returned total free
+                            &avail,      // bytes available to caller
+                            nullptr,     // ptr to returned total size
+                            nullptr)) {  // ptr to returned total free
         return avail.QuadPart;
     }
     DWORD dosError = GetLastError();
@@ -106,10 +106,10 @@ void File::open(const char* filename, bool readOnly, bool direct) {
     _handle = CreateFileW(toNativeString(filename).c_str(),               // filename
                           (readOnly ? 0 : GENERIC_WRITE) | GENERIC_READ,  // desired access
                           FILE_SHARE_WRITE | FILE_SHARE_READ,             // share mode
-                          NULL,                                           // security
+                          nullptr,                                        // security
                           OPEN_ALWAYS,                                    // create or open
                           FILE_ATTRIBUTE_NORMAL,                          // file attributes
-                          NULL);                                          // template
+                          nullptr);                                       // template
     _bad = !is_open();
     if (_bad) {
         DWORD dosError = GetLastError();
@@ -121,7 +121,7 @@ void File::open(const char* filename, bool readOnly, bool direct) {
 void File::read(fileofs o, char* data, unsigned len) {
     LARGE_INTEGER li;
     li.QuadPart = o;
-    if (SetFilePointerEx(_handle, li, NULL, FILE_BEGIN) == 0) {
+    if (SetFilePointerEx(_handle, li, nullptr, FILE_BEGIN) == 0) {
         _bad = true;
         DWORD dosError = GetLastError();
         log() << "In File::read(), SetFilePointerEx for '" << _name
@@ -154,7 +154,7 @@ void File::truncate(fileofs size) {
     }
     LARGE_INTEGER li;
     li.QuadPart = size;
-    if (SetFilePointerEx(_handle, li, NULL, FILE_BEGIN) == 0) {
+    if (SetFilePointerEx(_handle, li, nullptr, FILE_BEGIN) == 0) {
         _bad = true;
         DWORD dosError = GetLastError();
         log() << "In File::truncate(), SetFilePointerEx for '" << _name
@@ -173,7 +173,7 @@ void File::truncate(fileofs size) {
 void File::write(fileofs o, const char* data, unsigned len) {
     LARGE_INTEGER li;
     li.QuadPart = o;
-    if (SetFilePointerEx(_handle, li, NULL, FILE_BEGIN) == 0) {
+    if (SetFilePointerEx(_handle, li, nullptr, FILE_BEGIN) == 0) {
         _bad = true;
         DWORD dosError = GetLastError();
         log() << "In File::write(), SetFilePointerEx for '" << _name
@@ -182,7 +182,7 @@ void File::write(fileofs o, const char* data, unsigned len) {
         return;
     }
     DWORD bytesWritten;
-    if (WriteFile(_handle, data, len, &bytesWritten, NULL) == 0) {
+    if (WriteFile(_handle, data, len, &bytesWritten, nullptr) == 0) {
         _bad = true;
         DWORD dosError = GetLastError();
         log() << "In File::write(), WriteFile for '" << _name << "' tried to write " << len
diff --git a/src/mongo/util/net/private/socket_poll.cpp b/src/mongo/util/net/private/socket_poll.cpp
index 28bfed452de..7726aa3c077 100644
--- a/src/mongo/util/net/private/socket_poll.cpp
+++ b/src/mongo/util/net/private/socket_poll.cpp
@@ -39,7 +39,7 @@ namespace mongo {
 
 typedef int(WSAAPI* WSAPollFunction)(pollfd* fdarray, ULONG nfds, INT timeout);
 
-static WSAPollFunction wsaPollFunction = NULL;
+static WSAPollFunction wsaPollFunction = nullptr;
 
 MONGO_INITIALIZER(DynamicLinkWin32Poll)(InitializerContext* context) {
     HINSTANCE wsaPollLib = LoadLibraryW(L"Ws2_32.dll");
@@ -51,7 +51,7 @@ MONGO_INITIALIZER(DynamicLinkWin32Poll)(InitializerContext* context) {
 }
 
 bool isPollSupported() {
-    return wsaPollFunction != NULL;
+    return wsaPollFunction != nullptr;
 }
 
 int socketPoll(pollfd* fdarray, unsigned long nfds, int timeout) {
diff --git a/src/mongo/util/net/sock_test.cpp b/src/mongo/util/net/sock_test.cpp
index bb246175eef..d9b3ec8ee84 100644
--- a/src/mongo/util/net/sock_test.cpp
+++ b/src/mongo/util/net/sock_test.cpp
@@ -62,7 +62,7 @@ SocketPair socketPair(const int type, const int protocol = 0);
 namespace detail {
 void awaitAccept(SOCKET* acceptSock, SOCKET listenSock, Notification<void>& notify) {
     *acceptSock = INVALID_SOCKET;
-    const SOCKET result = ::accept(listenSock, NULL, 0);
+    const SOCKET result = ::accept(listenSock, nullptr, 0);
     if (result != INVALID_SOCKET) {
         *acceptSock = result;
     }
@@ -98,7 +98,7 @@ SocketPair socketPair(const int type, const int protocol) {
     hints.ai_socktype = type;
     hints.ai_flags = AI_PASSIVE;
 
-    int result = ::getaddrinfo(NULL, "0", &hints, &res);
+    int result = ::getaddrinfo(nullptr, "0", &hints, &res);
     if (result != 0) {
         closesocket(listenSock);
         return SocketPair();
@@ -135,7 +135,7 @@ SocketPair socketPair(const int type, const int protocol) {
     connectHints.ai_socktype = type;
     std::stringstream portStream;
     portStream << ntohs(bindAddr.sin_port);
-    result = ::getaddrinfo(NULL, portStream.str().c_str(), &connectHints, &connectRes);
+    result = ::getaddrinfo(nullptr, portStream.str().c_str(), &connectHints, &connectRes);
     if (result != 0) {
         closesocket(listenSock);
         ::freeaddrinfo(res);
diff --git a/src/mongo/util/net/ssl_manager_openssl.cpp b/src/mongo/util/net/ssl_manager_openssl.cpp
index 3c178b9f0b2..e716aacf584 100644
--- a/src/mongo/util/net/ssl_manager_openssl.cpp
+++ b/src/mongo/util/net/ssl_manager_openssl.cpp
@@ -184,7 +184,7 @@ bool enableECDHE(SSL_CTX* const ctx) {
     // this call could actually enable auto ecdh. We also ensure the OpenSSL version is sufficiently
     // old to protect against future versions where SSL_CTX_set_ecdh_auto could be removed and 94
     // ctrl code could be repurposed.
-    if (SSL_CTX_ctrl(ctx, 94, 1, NULL) != 1) {
+    if (SSL_CTX_ctrl(ctx, 94, 1, nullptr) != 1) {
         // If manually setting the configuration option failed, use a hard coded curve
         if (!useDefaultECKey(ctx)) {
             warning() << "Failed to enable ECDHE due to a lack of support from system libraries.";
@@ -1206,20 +1206,20 @@ Status importCertStoreToX509_STORE(const wchar_t* storeName,
                                    X509_STORE* verifyStore) {
     HCERTSTORE systemStore = CertOpenStore(CERT_STORE_PROV_SYSTEM_W,
                                            0,
-                                           NULL,
+                                           nullptr,
                                            storeLocation | CERT_STORE_READONLY_FLAG,
                                            const_cast<LPWSTR>(storeName));
-    if (systemStore == NULL) {
+    if (systemStore == nullptr) {
         return {ErrorCodes::InvalidSSLConfiguration,
                 str::stream() << "error opening system CA store: " << errnoWithDescription()};
     }
     auto systemStoreGuard = makeGuard([systemStore]() { CertCloseStore(systemStore, 0); });
 
-    PCCERT_CONTEXT certCtx = NULL;
-    while ((certCtx = CertEnumCertificatesInStore(systemStore, certCtx)) != NULL) {
+    PCCERT_CONTEXT certCtx = nullptr;
+    while ((certCtx = CertEnumCertificatesInStore(systemStore, certCtx)) != nullptr) {
         auto certBytes = static_cast<const unsigned char*>(certCtx->pbCertEncoded);
-        X509* x509Obj = d2i_X509(NULL, &certBytes, certCtx->cbCertEncoded);
-        if (x509Obj == NULL) {
+        X509* x509Obj = d2i_X509(nullptr, &certBytes, certCtx->cbCertEncoded);
+        if (x509Obj == nullptr) {
             return {ErrorCodes::InvalidSSLConfiguration,
                     str::stream() << "Error parsing X509 object from Windows certificate store"
                                   << SSLManagerInterface::getSSLErrorMessage(ERR_get_error())};
diff --git a/src/mongo/util/ntservice.cpp b/src/mongo/util/ntservice.cpp
index 11eba4b9d72..c5133a9c99a 100644
--- a/src/mongo/util/ntservice.cpp
+++ b/src/mongo/util/ntservice.cpp
@@ -57,9 +57,9 @@ namespace mongo {
 namespace ntservice {
 namespace {
 bool _startService = false;
-SERVICE_STATUS_HANDLE _statusHandle = NULL;
+SERVICE_STATUS_HANDLE _statusHandle = nullptr;
 wstring _serviceName;
-ServiceCallback _serviceCallback = NULL;
+ServiceCallback _serviceCallback = nullptr;
 }  // namespace
 
 static void installServiceOrDie(const wstring& serviceName,
@@ -279,19 +279,19 @@ void installServiceOrDie(const wstring& serviceName,
     std::vector<std::string> serviceArgv = constructServiceArgv(argv);
 
     char exePath[1024];
-    GetModuleFileNameA(NULL, exePath, sizeof exePath);
+    GetModuleFileNameA(nullptr, exePath, sizeof exePath);
     serviceArgv.at(0) = exePath;
 
     std::string commandLine = constructUtf8WindowsCommandLine(serviceArgv);
 
-    SC_HANDLE schSCManager = ::OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
-    if (schSCManager == NULL) {
+    SC_HANDLE schSCManager = ::OpenSCManager(nullptr, nullptr, SC_MANAGER_ALL_ACCESS);
+    if (schSCManager == nullptr) {
         DWORD err = ::GetLastError();
         log() << "Error connecting to the Service Control Manager: " << windows::GetErrMsg(err);
         quickExit(EXIT_NTSERVICE_ERROR);
     }
 
-    SC_HANDLE schService = NULL;
+    SC_HANDLE schService = nullptr;
     int retryCount = 10;
 
     while (true) {
@@ -299,7 +299,7 @@ void installServiceOrDie(const wstring& serviceName,
         // TODO: Check to see if service is in "Deleting" status, suggest the user close down
         // Services MMC snap-ins.
         schService = ::OpenService(schSCManager, serviceName.c_str(), SERVICE_ALL_ACCESS);
-        if (schService != NULL) {
+        if (schService != nullptr) {
             log() << "There is already a service named '" << toUtf8String(serviceName)
                   << (retryCount > 0 ? "', sleeping and retrying" : "', aborting");
             ::CloseServiceHandle(schService);
@@ -329,12 +329,12 @@ void installServiceOrDie(const wstring& serviceName,
                                   SERVICE_AUTO_START,         // start type
                                   SERVICE_ERROR_NORMAL,       // error control
                                   commandLineWide.c_str(),    // command line
-                                  NULL,                       // load order group
-                                  NULL,                       // tag id
+                                  nullptr,                    // load order group
+                                  nullptr,                    // tag id
                                   L"\0\0",                    // dependencies
-                                  NULL,                       // user account
-                                  NULL);                      // user account password
-    if (schService == NULL) {
+                                  nullptr,                    // user account
+                                  nullptr);                   // user account password
+    if (schService == nullptr) {
         DWORD err = ::GetLastError();
         log() << "Error creating service: " << windows::GetErrMsg(err);
         ::CloseServiceHandle(schSCManager);
@@ -364,13 +364,13 @@ void installServiceOrDie(const wstring& serviceName,
                                                  SERVICE_NO_CHANGE,          // service type
                                                  SERVICE_NO_CHANGE,          // start type
                                                  SERVICE_NO_CHANGE,          // error control
-                                                 NULL,                       // path
-                                                 NULL,                       // load order group
-                                                 NULL,                       // tag id
-                                                 NULL,                       // dependencies
+                                                 nullptr,                    // path
+                                                 nullptr,                    // load order group
+                                                 nullptr,                    // tag id
+                                                 nullptr,                    // dependencies
                                                  actualServiceUser.c_str(),  // user account
                                                  servicePassword.c_str(),  // user account password
-                                                 NULL);                    // service display name
+                                                 nullptr);                 // service display name
         if (!serviceInstalled) {
             log() << "Setting service login failed, service has 'LocalService' permissions";
         }
@@ -438,15 +438,15 @@ void installServiceOrDie(const wstring& serviceName,
 void removeServiceOrDie(const wstring& serviceName) {
     log() << "Trying to remove Windows service '" << toUtf8String(serviceName) << "'";
 
-    SC_HANDLE schSCManager = ::OpenSCManager(NULL, NULL, SC_MANAGER_ALL_ACCESS);
-    if (schSCManager == NULL) {
+    SC_HANDLE schSCManager = ::OpenSCManager(nullptr, nullptr, SC_MANAGER_ALL_ACCESS);
+    if (schSCManager == nullptr) {
         DWORD err = ::GetLastError();
         log() << "Error connecting to the Service Control Manager: " << windows::GetErrMsg(err);
         quickExit(EXIT_NTSERVICE_ERROR);
     }
 
     SC_HANDLE schService = ::OpenService(schSCManager, serviceName.c_str(), SERVICE_ALL_ACCESS);
-    if (schService == NULL) {
+    if (schService == nullptr) {
         log() << "Could not find a service named '" << toUtf8String(serviceName) << "' to remove";
         ::CloseServiceHandle(schSCManager);
         quickExit(EXIT_NTSERVICE_ERROR);
@@ -484,7 +484,7 @@ void removeServiceOrDie(const wstring& serviceName) {
 }
 
 bool reportStatus(DWORD reportState, DWORD waitHint, DWORD exitCode) {
-    if (_statusHandle == NULL)
+    if (_statusHandle == nullptr)
         return false;
 
     static DWORD checkPoint = 1;
@@ -551,7 +551,7 @@ static void serviceStop() {
 }
 
 static void WINAPI initService(DWORD argc, LPTSTR* argv) {
-    _statusHandle = RegisterServiceCtrlHandlerEx(_serviceName.c_str(), serviceCtrl, NULL);
+    _statusHandle = RegisterServiceCtrlHandlerEx(_serviceName.c_str(), serviceCtrl, nullptr);
     if (!_statusHandle)
         return;
 
@@ -615,7 +615,7 @@ void startService() {
 
     SERVICE_TABLE_ENTRYW dispTable[] = {
         {const_cast<LPWSTR>(_serviceName.c_str()), (LPSERVICE_MAIN_FUNCTION)initService},
-        {NULL, NULL}};
+        {nullptr, nullptr}};
 
     log() << "Trying to start Windows service '" << toUtf8String(_serviceName) << "'";
     if (StartServiceCtrlDispatcherW(dispTable)) {
diff --git a/src/mongo/util/processinfo_osx.cpp b/src/mongo/util/processinfo_osx.cpp
index a11a8a5974a..0ed7de3a1f9 100644
--- a/src/mongo/util/processinfo_osx.cpp
+++ b/src/mongo/util/processinfo_osx.cpp
@@ -145,11 +145,11 @@ Variant getSysctlByName(const char* sysctlName) {
     // NB: sysctlbyname is called once to determine the buffer length, and once to copy
     //     the sysctl value.  Retry if the buffer length grows between calls.
     do {
-        status = sysctlbyname(sysctlName, NULL, &len, NULL, 0);
+        status = sysctlbyname(sysctlName, nullptr, &len, nullptr, 0);
         if (status == -1)
             break;
         value.resize(len);
-        status = sysctlbyname(sysctlName, &*value.begin(), &len, NULL, 0);
+        status = sysctlbyname(sysctlName, &*value.begin(), &len, nullptr, 0);
     } while (status == -1 && errno == ENOMEM);
     if (status == -1) {
         // unrecoverable error from sysctlbyname
@@ -168,7 +168,7 @@ template <>
 long long getSysctlByName<NumberVal>(const char* sysctlName) {
     long long value = 0;
     size_t len = sizeof(value);
-    if (sysctlbyname(sysctlName, &value, &len, NULL, 0) < 0) {
+    if (sysctlbyname(sysctlName, &value, &len, nullptr, 0) < 0) {
         log() << "Unable to resolve sysctl " << sysctlName << " (number) ";
     }
     if (len > 8) {
diff --git a/src/mongo/util/signal_handlers.cpp b/src/mongo/util/signal_handlers.cpp
index f6f81234c11..2f361b363e5 100644
--- a/src/mongo/util/signal_handlers.cpp
+++ b/src/mongo/util/signal_handlers.cpp
@@ -131,8 +131,8 @@ BOOL WINAPI CtrlHandler(DWORD fdwCtrlType) {
 void eventProcessingThread() {
     std::string eventName = getShutdownSignalName(ProcessId::getCurrent().asUInt32());
 
-    HANDLE event = CreateEventA(NULL, TRUE, FALSE, eventName.c_str());
-    if (event == NULL) {
+    HANDLE event = CreateEventA(nullptr, TRUE, FALSE, eventName.c_str());
+    if (event == nullptr) {
         warning() << "eventProcessingThread CreateEvent failed: " << errnoWithDescription();
         return;
     }
diff --git a/src/mongo/util/signal_handlers_synchronous.cpp b/src/mongo/util/signal_handlers_synchronous.cpp
index 90b758d40fc..e1cd8371177 100644
--- a/src/mongo/util/signal_handlers_synchronous.cpp
+++ b/src/mongo/util/signal_handlers_synchronous.cpp
@@ -73,7 +73,7 @@ const char* strsignal(int signalNum) {
 }
 
 void endProcessWithSignal(int signalNum) {
-    RaiseException(EXIT_ABRUPT, EXCEPTION_NONCONTINUABLE, 0, NULL);
+    RaiseException(EXIT_ABRUPT, EXCEPTION_NONCONTINUABLE, 0, nullptr);
 }
 
 #else
diff --git a/src/mongo/util/text.cpp b/src/mongo/util/text.cpp
index df084ac1bae..f01ed7797a4 100644
--- a/src/mongo/util/text.cpp
+++ b/src/mongo/util/text.cpp
@@ -154,7 +154,7 @@ std::string toUtf8String(const std::wstring& wide) {
 
     // Calculate necessary buffer size
     int len = ::WideCharToMultiByte(
-        CP_UTF8, 0, wide.c_str(), static_cast<int>(wide.size()), NULL, 0, NULL, NULL);
+        CP_UTF8, 0, wide.c_str(), static_cast<int>(wide.size()), nullptr, 0, nullptr, nullptr);
 
     // Perform actual conversion
     if (len > 0) {
@@ -165,8 +165,8 @@ std::string toUtf8String(const std::wstring& wide) {
                                     static_cast<int>(wide.size()),
                                     &buffer[0],
                                     static_cast<int>(buffer.size()),
-                                    NULL,
-                                    NULL);
+                                    nullptr,
+                                    nullptr);
         if (len > 0) {
             verify(len == static_cast<int>(buffer.size()));
             return std::string(&buffer[0], buffer.size());
@@ -182,7 +182,7 @@ std::wstring toWideString(const char* utf8String) {
                                          0,           // Flags
                                          utf8String,  // Input string
                                          -1,          // Count, -1 for NUL-terminated
-                                         NULL,        // No output buffer
+                                         nullptr,     // No output buffer
                                          0            // Zero means "compute required size"
                                          );
     if (bufferSize == 0) {
@@ -212,7 +212,7 @@ bool writeUtf8ToWindowsConsole(const char* utf8String, unsigned int utf8StringSi
                                          0,               // Flags
                                          utf8String,      // Input string
                                          utf8StringSize,  // Input string length
-                                         NULL,            // No output buffer
+                                         nullptr,         // No output buffer
                                          0                // Zero means "compute required size"
                                          );
     if (bufferSize == 0) {
@@ -240,7 +240,7 @@ bool writeUtf8ToWindowsConsole(const char* utf8String, unsigned int utf8StringSi
                                      utf16Pointer,
                                      numberOfCharactersThisPass,
                                      &numberOfCharactersWritten,
-                                     NULL);
+                                     nullptr);
         if (0 == success) {
             DWORD dosError = GetLastError();
             static bool errorMessageShown = false;
@@ -265,7 +265,7 @@ bool writeUtf8ToWindowsConsole(const char* utf8String, unsigned int utf8StringSi
 }
 
 WindowsCommandLine::WindowsCommandLine(int argc, wchar_t* argvW[], wchar_t* envpW[])
-    : _argv(NULL), _envp(NULL) {
+    : _argv(nullptr), _envp(nullptr) {
     // Construct UTF-8 copy of arguments
     std::vector<std::string> utf8args;
     std::vector<size_t> utf8argLength;
@@ -307,7 +307,7 @@ WindowsCommandLine::WindowsCommandLine(int argc, wchar_t* argvW[], wchar_t* envp
         strcpy_s(_envp[i], utf8envLength[i], utf8envs[i].c_str());
         blockPtr += utf8envLength[i];
     }
-    _envp[i] = NULL;
+    _envp[i] = nullptr;
 }
 
 WindowsCommandLine::~WindowsCommandLine() {
diff --git a/src/mongo/util/text_test.cpp b/src/mongo/util/text_test.cpp
index 77d6561e795..cee02a05c19 100644
--- a/src/mongo/util/text_test.cpp
+++ b/src/mongo/util/text_test.cpp
@@ -56,16 +56,17 @@ TEST(WindowsCommandLineConstruction, EmptyCommandLine) {
 }
 
 TEST(WindowsCommandLineConstruction, NothingToQuote) {
-    ASSERT_EQUALS("abc d \"\" e", constructUtf8WindowsCommandLine(svec("abc", "d", "", "e", NULL)));
+    ASSERT_EQUALS("abc d \"\" e",
+                  constructUtf8WindowsCommandLine(svec("abc", "d", "", "e", nullptr)));
 }
 
 TEST(WindowsCommandLineConstruction, ThingsToQuote) {
     ASSERT_EQUALS("a\\\\\\b \"de fg\" h",
-                  constructUtf8WindowsCommandLine(svec("a\\\\\\b", "de fg", "h", NULL)));
+                  constructUtf8WindowsCommandLine(svec("a\\\\\\b", "de fg", "h", nullptr)));
     ASSERT_EQUALS("\"a\\\\b c\" d e",
-                  constructUtf8WindowsCommandLine(svec("a\\\\b c", "d", "e", NULL)));
-    ASSERT_EQUALS("\"a \\\\\" \\", constructUtf8WindowsCommandLine(svec("a \\", "\\", NULL)));
-    ASSERT_EQUALS("\"\\\\\\\\\\\"\"", constructUtf8WindowsCommandLine(svec("\\\\\"", NULL)));
+                  constructUtf8WindowsCommandLine(svec("a\\\\b c", "d", "e", nullptr)));
+    ASSERT_EQUALS("\"a \\\\\" \\", constructUtf8WindowsCommandLine(svec("a \\", "\\", nullptr)));
+    ASSERT_EQUALS("\"\\\\\\\\\\\"\"", constructUtf8WindowsCommandLine(svec("\\\\\"", nullptr)));
 }
 
 TEST(WindowsCommandLineConstruction, RegressionSERVER_7252) {
@@ -88,5 +89,5 @@ TEST(WindowsCommandLineConstruction, RegressionSERVER_7252) {
                                              "C:\\mongo\\logs\\mongo_config.log.txt",
                                              "--configsvr",
                                              "--service",
-                                             NULL)));
+                                             nullptr)));
 }
diff --git a/src/mongo/util/time_support.cpp b/src/mongo/util/time_support.cpp
index b40ebcb19ee..77277b56cb2 100644
--- a/src/mongo/util/time_support.cpp
+++ b/src/mongo/util/time_support.cpp
@@ -874,7 +874,7 @@ static unsigned long long resyncTime() {
 
 unsigned long long curTimeMicros64() {
     // Windows 8/2012 & later support a <1us time function
-    if (GetSystemTimePreciseAsFileTimeFunc != NULL) {
+    if (GetSystemTimePreciseAsFileTimeFunc != nullptr) {
         FILETIME time;
         GetSystemTimePreciseAsFileTimeFunc(&time);
         return fileTimeToMicroseconds(time);
diff --git a/src/mongo/util/winutil.h b/src/mongo/util/winutil.h
index bab5d8256a7..f6ef4592e23 100644
--- a/src/mongo/util/winutil.h
+++ b/src/mongo/util/winutil.h
@@ -50,12 +50,12 @@ namespace windows {
 inline std::string GetErrMsg(DWORD err) {
     LPTSTR errMsg;
     ::FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
-                    NULL,
+                    nullptr,
                     err,
                     0,
                     (LPTSTR)&errMsg,
                     0,
-                    NULL);
+                    nullptr);
     std::string errMsgStr = toUtf8String(errMsg);
     ::LocalFree(errMsg);
     // FormatMessage() appends a newline to the end of error messages, we trim it because std::endl