diff --git a/cmds/atrace/atrace.cpp b/cmds/atrace/atrace.cpp
index 668a701..b583442 100644
--- a/cmds/atrace/atrace.cpp
+++ b/cmds/atrace/atrace.cpp
@@ -229,8 +229,8 @@
 static bool g_compress = false;
 static bool g_nohup = false;
 static int g_initialSleepSecs = 0;
-static const char* g_categoriesFile = NULL;
-static const char* g_kernelTraceFuncs = NULL;
+static const char* g_categoriesFile = nullptr;
+static const char* g_kernelTraceFuncs = nullptr;
 static const char* g_debugAppCmdLine = "";
 static const char* g_outputFile = nullptr;
 
@@ -406,7 +406,7 @@
     for (int i = 0; i < MAX_SYS_FILES; i++) {
         const char* path = category.sysfiles[i].path;
         bool req = category.sysfiles[i].required == REQ;
-        if (path != NULL) {
+        if (path != nullptr) {
             if (req) {
                 if (!fileIsWritable(path)) {
                     return false;
@@ -431,7 +431,7 @@
     for (int i = 0; i < MAX_SYS_FILES; i++) {
         const char* path = category.sysfiles[i].path;
         bool req = category.sysfiles[i].required == REQ;
-        if (path != NULL) {
+        if (path != nullptr) {
             if (req) {
                 if (!fileExists(path)) {
                     return false;
@@ -547,10 +547,10 @@
     Vector<String16> services = sm->listServices();
     for (size_t i = 0; i < services.size(); i++) {
         sp<IBinder> obj = sm->checkService(services[i]);
-        if (obj != NULL) {
+        if (obj != nullptr) {
             Parcel data;
             if (obj->transact(IBinder::SYSPROPS_TRANSACTION, data,
-                    NULL, 0) != OK) {
+                    nullptr, 0) != OK) {
                 if (false) {
                     // XXX: For some reason this fails on tablets trying to
                     // poke the "phone" service.  It's not clear whether some
@@ -640,9 +640,9 @@
 {
     int i = 0;
     char* start = cmdline;
-    while (start != NULL) {
+    while (start != nullptr) {
         char* end = strchr(start, ',');
-        if (end != NULL) {
+        if (end != nullptr) {
             *end = '\0';
             end++;
         }
@@ -672,7 +672,7 @@
         const TracingCategory &c = k_categories[i];
         for (int j = 0; j < MAX_SYS_FILES; j++) {
             const char* path = c.sysfiles[j].path;
-            if (path != NULL && fileIsWritable(path)) {
+            if (path != nullptr && fileIsWritable(path)) {
                 ok &= setKernelOptionEnable(path, false);
             }
         }
@@ -708,7 +708,7 @@
                 ok = false;
             }
         }
-        func = strtok(NULL, ",");
+        func = strtok(nullptr, ",");
     }
     free(myFuncs);
     return ok;
@@ -719,7 +719,7 @@
 {
     bool ok = true;
 
-    if (funcs == NULL || funcs[0] == '\0') {
+    if (funcs == nullptr || funcs[0] == '\0') {
         // Disable kernel function tracing.
         if (fileIsWritable(k_currentTracerPath)) {
             ok &= writeStr(k_currentTracerPath, "nop");
@@ -741,7 +741,7 @@
         char* func = strtok(myFuncs, ",");
         while (func) {
             ok &= appendStr(k_ftraceFilterPath, func);
-            func = strtok(NULL, ",");
+            func = strtok(nullptr, ",");
         }
         free(myFuncs);
 
@@ -783,7 +783,7 @@
     if (!categories_file) {
         return true;
     }
-    Tokenizer* tokenizer = NULL;
+    Tokenizer* tokenizer = nullptr;
     if (Tokenizer::open(String8(categories_file), &tokenizer) != NO_ERROR) {
         return false;
     }
@@ -885,7 +885,7 @@
             for (int j = 0; j < MAX_SYS_FILES; j++) {
                 const char* path = c.sysfiles[j].path;
                 bool required = c.sysfiles[j].required == REQ;
-                if (path != NULL) {
+                if (path != nullptr) {
                     if (fileIsWritable(path)) {
                         ok &= setKernelOptionEnable(path, true);
                     } else if (required) {
@@ -910,7 +910,7 @@
     setTraceOverwriteEnable(true);
     setTraceBufferSizeKB(1);
     setPrintTgidEnableIfPresent(false);
-    setKernelTraceFuncs(NULL);
+    setKernelTraceFuncs(nullptr);
     setUserInitiatedTraceProperty(false);
 }
 
@@ -1068,10 +1068,10 @@
     sigemptyset(&sa.sa_mask);
     sa.sa_flags = 0;
     sa.sa_handler = handleSignal;
-    sigaction(SIGHUP, &sa, NULL);
-    sigaction(SIGINT, &sa, NULL);
-    sigaction(SIGQUIT, &sa, NULL);
-    sigaction(SIGTERM, &sa, NULL);
+    sigaction(SIGHUP, &sa, nullptr);
+    sigaction(SIGINT, &sa, nullptr);
+    sigaction(SIGQUIT, &sa, nullptr);
+    sigaction(SIGTERM, &sa, nullptr);
 }
 
 static void listSupportedCategories()
@@ -1161,13 +1161,13 @@
         int ret;
         int option_index = 0;
         static struct option long_options[] = {
-            {"async_start",       no_argument, 0,  0 },
-            {"async_stop",        no_argument, 0,  0 },
-            {"async_dump",        no_argument, 0,  0 },
-            {"only_userspace",    no_argument, 0,  0 },
-            {"list_categories",   no_argument, 0,  0 },
-            {"stream",            no_argument, 0,  0 },
-            {           0,                  0, 0,  0 }
+            {"async_start",       no_argument, nullptr,  0 },
+            {"async_stop",        no_argument, nullptr,  0 },
+            {"async_dump",        no_argument, nullptr,  0 },
+            {"only_userspace",    no_argument, nullptr,  0 },
+            {"list_categories",   no_argument, nullptr,  0 },
+            {"stream",            no_argument, nullptr,  0 },
+            {nullptr,                       0, nullptr,  0 }
         };
 
         ret = getopt_long(argc, argv, "a:b:cf:k:ns:t:zo:",
diff --git a/cmds/cmd/cmd.cpp b/cmds/cmd/cmd.cpp
index 4238531..0616add 100644
--- a/cmds/cmd/cmd.cpp
+++ b/cmds/cmd/cmd.cpp
@@ -103,12 +103,12 @@
         }
         if (is_selinux_enabled() && seLinuxContext.size() > 0) {
             String8 seLinuxContext8(seLinuxContext);
-            security_context_t tmp = NULL;
+            security_context_t tmp = nullptr;
             getfilecon(fullPath.string(), &tmp);
             Unique_SecurityContext context(tmp);
             if (checkWrite) {
                 int accessGranted = selinux_check_access(seLinuxContext8.string(), context.get(),
-                        "file", "write", NULL);
+                        "file", "write", nullptr);
                 if (accessGranted != 0) {
 #if DEBUG
                     ALOGD("openFile: failed selinux write check!");
@@ -122,7 +122,7 @@
             }
             if (checkRead) {
                 int accessGranted = selinux_check_access(seLinuxContext8.string(), context.get(),
-                        "file", "read", NULL);
+                        "file", "read", nullptr);
                 if (accessGranted != 0) {
 #if DEBUG
                     ALOGD("openFile: failed selinux read check!");
@@ -174,7 +174,7 @@
 #endif
     sp<IServiceManager> sm = defaultServiceManager();
     fflush(stdout);
-    if (sm == NULL) {
+    if (sm == nullptr) {
         ALOGW("Unable to get default service manager!");
         aerr << "cmd: Unable to get default service manager!" << endl;
         return 20;
@@ -192,7 +192,7 @@
 
         for (size_t i=0; i<services.size(); i++) {
             sp<IBinder> service = sm->checkService(services[i]);
-            if (service != NULL) {
+            if (service != nullptr) {
                 aout << "  " << services[i] << endl;
             }
         }
@@ -205,7 +205,7 @@
     }
     String16 cmd = String16(argv[1]);
     sp<IBinder> service = sm->checkService(cmd);
-    if (service == NULL) {
+    if (service == nullptr) {
         ALOGW("Can't find service %s", argv[1]);
         aerr << "cmd: Can't find service: " << argv[1] << endl;
         return 20;
diff --git a/cmds/dumpstate/DumpstateUtil.cpp b/cmds/dumpstate/DumpstateUtil.cpp
index 85eb464..600a500 100644
--- a/cmds/dumpstate/DumpstateUtil.cpp
+++ b/cmds/dumpstate/DumpstateUtil.cpp
@@ -56,11 +56,11 @@
     timespec ts;
     ts.tv_sec = MSEC_TO_SEC(timeout_ms);
     ts.tv_nsec = (timeout_ms % 1000) * 1000000;
-    int ret = TEMP_FAILURE_RETRY(sigtimedwait(&child_mask, NULL, &ts));
+    int ret = TEMP_FAILURE_RETRY(sigtimedwait(&child_mask, nullptr, &ts));
     int saved_errno = errno;
 
     // Set the signals back the way they were.
-    if (sigprocmask(SIG_SETMASK, &old_mask, NULL) == -1) {
+    if (sigprocmask(SIG_SETMASK, &old_mask, nullptr) == -1) {
         printf("*** sigprocmask failed: %s\n", strerror(errno));
         if (ret == 0) {
             return false;
@@ -310,7 +310,7 @@
         struct sigaction sigact;
         memset(&sigact, 0, sizeof(sigact));
         sigact.sa_handler = SIG_IGN;
-        sigaction(SIGPIPE, &sigact, NULL);
+        sigaction(SIGPIPE, &sigact, nullptr);
 
         execvp(path, (char**)args.data());
         // execvp's result will be handled after waitpid_with_timeout() below, but
diff --git a/cmds/dumpstate/dumpstate.cpp b/cmds/dumpstate/dumpstate.cpp
index dec767d..2c248c6 100644
--- a/cmds/dumpstate/dumpstate.cpp
+++ b/cmds/dumpstate/dumpstate.cpp
@@ -90,7 +90,7 @@
 
 /* read before root is shed */
 static char cmdline_buf[16384] = "(unknown)";
-static const char *dump_traces_path = NULL;
+static const char *dump_traces_path = nullptr;
 
 // TODO: variables and functions below should be part of dumpstate object
 
@@ -295,7 +295,7 @@
     char path[PATH_MAX];
 
     d = opendir(driverpath);
-    if (d == NULL) {
+    if (d == nullptr) {
         return;
     }
 
@@ -587,7 +587,7 @@
 static int dump_stat_from_fd(const char *title __unused, const char *path, int fd) {
     unsigned long long fields[__STAT_NUMBER_FIELD];
     bool z;
-    char *cp, *buffer = NULL;
+    char *cp, *buffer = nullptr;
     size_t i = 0;
     FILE *fp = fdopen(dup(fd), "rb");
     getline(&buffer, &i, fp);
@@ -1686,7 +1686,7 @@
             | O_CLOEXEC | O_NOFOLLOW)));
     if (fd == -1) {
         MYLOGE("open(%s): %s\n", filepath.c_str(), strerror(errno));
-        return NULL;
+        return nullptr;
     }
 
     SHA256_CTX ctx;
@@ -1699,7 +1699,7 @@
             break;
         } else if (bytes_read == -1) {
             MYLOGE("read(%s): %s\n", filepath.c_str(), strerror(errno));
-            return NULL;
+            return nullptr;
         }
 
         SHA256_Update(&ctx, buffer.data(), bytes_read);
@@ -1748,7 +1748,7 @@
     int do_add_date = 0;
     int do_zip_file = 0;
     int do_vibrate = 1;
-    char* use_outfile = 0;
+    char* use_outfile = nullptr;
     int use_socket = 0;
     int use_control_socket = 0;
     int do_fb = 0;
diff --git a/cmds/dumpstate/utils.cpp b/cmds/dumpstate/utils.cpp
index 9beff98..77f09b7 100644
--- a/cmds/dumpstate/utils.cpp
+++ b/cmds/dumpstate/utils.cpp
@@ -525,13 +525,13 @@
     if (PropertiesHelper::IsDryRun()) return;
 
     /* Get size of kernel buffer */
-    int size = klogctl(KLOG_SIZE_BUFFER, NULL, 0);
+    int size = klogctl(KLOG_SIZE_BUFFER, nullptr, 0);
     if (size <= 0) {
         printf("Unexpected klogctl return value: %d\n\n", size);
         return;
     }
     char *buf = (char *) malloc(size + 1);
-    if (buf == NULL) {
+    if (buf == nullptr) {
         printf("memory allocation failed\n\n");
         return;
     }
@@ -598,7 +598,7 @@
     DurationReporter duration_reporter(title);
     DIR *dirp;
     struct dirent *d;
-    char *newpath = NULL;
+    char *newpath = nullptr;
     const char *slash = "/";
     int retval = 0;
 
@@ -611,7 +611,7 @@
         ++slash;
     }
     dirp = opendir(dir);
-    if (dirp == NULL) {
+    if (dirp == nullptr) {
         retval = -errno;
         MYLOGE("%s: %s\n", dir, strerror(errno));
         return retval;
@@ -620,7 +620,7 @@
     if (!dump_from_fd) {
         dump_from_fd = dump_file_from_fd;
     }
-    for (; ((d = readdir(dirp))); free(newpath), newpath = NULL) {
+    for (; ((d = readdir(dirp))); free(newpath), newpath = nullptr) {
         if ((d->d_name[0] == '.')
          && (((d->d_name[1] == '.') && (d->d_name[2] == '\0'))
           || (d->d_name[1] == '\0'))) {
@@ -648,7 +648,7 @@
             printf("*** %s: %s\n", newpath, strerror(errno));
             continue;
         }
-        (*dump_from_fd)(NULL, newpath, fd.get());
+        (*dump_from_fd)(nullptr, newpath, fd.get());
     }
     closedir(dirp);
     if (!title.empty()) {
diff --git a/cmds/flatland/GLHelper.cpp b/cmds/flatland/GLHelper.cpp
index d5b3372..62d2fa1 100644
--- a/cmds/flatland/GLHelper.cpp
+++ b/cmds/flatland/GLHelper.cpp
@@ -29,7 +29,7 @@
     mContext(EGL_NO_CONTEXT),
     mDummySurface(EGL_NO_SURFACE),
     mConfig(0),
-    mShaderPrograms(NULL),
+    mShaderPrograms(nullptr),
     mDitherTexture(0) {
 }
 
@@ -101,12 +101,12 @@
 }
 
 void GLHelper::tearDown() {
-    if (mShaderPrograms != NULL) {
+    if (mShaderPrograms != nullptr) {
         delete[] mShaderPrograms;
-        mShaderPrograms = NULL;
+        mShaderPrograms = nullptr;
     }
 
-    if (mSurfaceComposerClient != NULL) {
+    if (mSurfaceComposerClient != nullptr) {
         mSurfaceComposerClient->dispose();
         mSurfaceComposerClient.clear();
     }
@@ -210,7 +210,7 @@
     glc->setConsumerUsageBits(GRALLOC_USAGE_HW_COMPOSER);
 
     sp<ANativeWindow> anw = new Surface(producer);
-    EGLSurface s = eglCreateWindowSurface(mDisplay, mConfig, anw.get(), NULL);
+    EGLSurface s = eglCreateWindowSurface(mDisplay, mConfig, anw.get(), nullptr);
     if (s == EGL_NO_SURFACE) {
         fprintf(stderr, "eglCreateWindowSurface error: %#x\n", eglGetError());
         return false;
@@ -223,7 +223,7 @@
 
 bool GLHelper::computeWindowScale(uint32_t w, uint32_t h, float* scale) {
     sp<IBinder> dpy = mSurfaceComposerClient->getBuiltInDisplay(0);
-    if (dpy == NULL) {
+    if (dpy == nullptr) {
         fprintf(stderr, "SurfaceComposer::getBuiltInDisplay failed.\n");
         return false;
     }
@@ -247,7 +247,7 @@
     bool result;
     status_t err;
 
-    if (mSurfaceComposerClient == NULL) {
+    if (mSurfaceComposerClient == nullptr) {
         mSurfaceComposerClient = new SurfaceComposerClient;
     }
     err = mSurfaceComposerClient->initCheck();
@@ -258,7 +258,7 @@
 
     sp<SurfaceControl> sc = mSurfaceComposerClient->createSurface(
             String8("Benchmark"), w, h, PIXEL_FORMAT_RGBA_8888, 0);
-    if (sc == NULL || !sc->isValid()) {
+    if (sc == nullptr || !sc->isValid()) {
         fprintf(stderr, "Failed to create SurfaceControl.\n");
         return false;
     }
@@ -275,7 +275,7 @@
             .apply();
 
     sp<ANativeWindow> anw = sc->getSurface();
-    EGLSurface s = eglCreateWindowSurface(mDisplay, mConfig, anw.get(), NULL);
+    EGLSurface s = eglCreateWindowSurface(mDisplay, mConfig, anw.get(), nullptr);
     if (s == EGL_NO_SURFACE) {
         fprintf(stderr, "eglCreateWindowSurface error: %#x\n", eglGetError());
         return false;
@@ -294,7 +294,7 @@
         return false;
     }
 
-    glShaderSource(shader, 1, &src, NULL);
+    glShaderSource(shader, 1, &src, nullptr);
     glCompileShader(shader);
 
     GLint compiled = 0;
@@ -305,7 +305,7 @@
         if (infoLen) {
             char* buf = new char[infoLen];
             if (buf) {
-                glGetShaderInfoLog(shader, infoLen, NULL, buf);
+                glGetShaderInfoLog(shader, infoLen, nullptr, buf);
                 fprintf(stderr, "Shader compile log:\n%s\n", buf);
                 delete[] buf;
             }
@@ -318,21 +318,21 @@
 }
 
 static void printShaderSource(const char* const* src) {
-    for (size_t i = 0; i < MAX_SHADER_LINES && src[i] != NULL; i++) {
+    for (size_t i = 0; i < MAX_SHADER_LINES && src[i] != nullptr; i++) {
         fprintf(stderr, "%3zu: %s\n", i+1, src[i]);
     }
 }
 
 static const char* makeShaderString(const char* const* src) {
     size_t len = 0;
-    for (size_t i = 0; i < MAX_SHADER_LINES && src[i] != NULL; i++) {
+    for (size_t i = 0; i < MAX_SHADER_LINES && src[i] != nullptr; i++) {
         // The +1 is for the '\n' that will be added.
         len += strlen(src[i]) + 1;
     }
 
     char* result = new char[len+1];
     char* end = result;
-    for (size_t i = 0; i < MAX_SHADER_LINES && src[i] != NULL; i++) {
+    for (size_t i = 0; i < MAX_SHADER_LINES && src[i] != nullptr; i++) {
         strcpy(end, src[i]);
         end += strlen(src[i]);
         *end = '\n';
@@ -376,7 +376,7 @@
         if (bufLength) {
             char* buf = new char[bufLength];
             if (buf) {
-                glGetProgramInfoLog(program, bufLength, NULL, buf);
+                glGetProgramInfoLog(program, bufLength, nullptr, buf);
                 fprintf(stderr, "Program link log:\n%s\n", buf);
                 delete[] buf;
             }
diff --git a/cmds/flatland/Main.cpp b/cmds/flatland/Main.cpp
index 3d7cac0..7ceb397 100644
--- a/cmds/flatland/Main.cpp
+++ b/cmds/flatland/Main.cpp
@@ -284,7 +284,7 @@
 public:
 
     Layer() :
-        mGLHelper(NULL),
+        mGLHelper(nullptr),
         mSurface(EGL_NO_SURFACE) {
     }
 
@@ -316,23 +316,23 @@
     }
 
     void tearDown() {
-        if (mComposer != NULL) {
+        if (mComposer != nullptr) {
             mComposer->tearDown();
             delete mComposer;
-            mComposer = NULL;
+            mComposer = nullptr;
         }
 
-        if (mRenderer != NULL) {
+        if (mRenderer != nullptr) {
             mRenderer->tearDown();
             delete mRenderer;
-            mRenderer = NULL;
+            mRenderer = nullptr;
         }
 
         if (mSurface != EGL_NO_SURFACE) {
             mGLHelper->destroySurface(&mSurface);
             mGLConsumer->abandon();
         }
-        mGLHelper = NULL;
+        mGLHelper = nullptr;
         mGLConsumer.clear();
     }
 
@@ -377,7 +377,7 @@
         mDesc(desc),
         mInstance(instance),
         mNumLayers(countLayers(desc)),
-        mGLHelper(NULL),
+        mGLHelper(nullptr),
         mSurface(EGL_NO_SURFACE),
         mWindowSurface(EGL_NO_SURFACE) {
     }
@@ -443,7 +443,7 @@
             mLayers[i].tearDown();
         }
 
-        if (mGLHelper != NULL) {
+        if (mGLHelper != nullptr) {
             if (mWindowSurface != EGL_NO_SURFACE) {
                 mGLHelper->destroySurface(&mWindowSurface);
             }
@@ -453,7 +453,7 @@
             mSurfaceControl.clear();
             mGLHelper->tearDown();
             delete mGLHelper;
-            mGLHelper = NULL;
+            mGLHelper = nullptr;
         }
     }
 
@@ -553,7 +553,7 @@
     static size_t countLayers(const BenchmarkDesc& desc) {
         size_t i;
         for (i = 0; i < MAX_NUM_LAYERS; i++) {
-            if (desc.layers[i].rendererFactory == NULL) {
+            if (desc.layers[i].rendererFactory == nullptr) {
                 break;
             }
         }
diff --git a/cmds/lshal/ListCommand.cpp b/cmds/lshal/ListCommand.cpp
index 09eeaa8..8d5f0d2 100644
--- a/cmds/lshal/ListCommand.cpp
+++ b/cmds/lshal/ListCommand.cpp
@@ -1073,9 +1073,9 @@
         i++;
     }
     // getopt_long last option has all zeros
-    ret[i].name = NULL;
+    ret[i].name = nullptr;
     ret[i].has_arg = 0;
-    ret[i].flag = NULL;
+    ret[i].flag = nullptr;
     ret[i].val = 0;
 
     return ret;
diff --git a/cmds/lshal/PipeRelay.cpp b/cmds/lshal/PipeRelay.cpp
index 3828bbf..87d75ac 100644
--- a/cmds/lshal/PipeRelay.cpp
+++ b/cmds/lshal/PipeRelay.cpp
@@ -78,7 +78,7 @@
 PipeRelay::~PipeRelay() {
     CloseFd(&mFds[1]);
 
-    if (mThread != NULL) {
+    if (mThread != nullptr) {
         mThread->join();
         mThread.clear();
     }
diff --git a/cmds/lshal/Timeout.h b/cmds/lshal/Timeout.h
index c940404..58119a6 100644
--- a/cmds/lshal/Timeout.h
+++ b/cmds/lshal/Timeout.h
@@ -57,7 +57,7 @@
     BackgroundTaskState &state = *static_cast<BackgroundTaskState *>(data);
     state();
     state.notify();
-    return NULL;
+    return nullptr;
 }
 
 template<class R, class P>
@@ -65,7 +65,7 @@
     auto now = std::chrono::system_clock::now();
     BackgroundTaskState state{std::forward<decltype(func)>(func)};
     pthread_t thread;
-    if (pthread_create(&thread, NULL, callAndNotify, &state)) {
+    if (pthread_create(&thread, nullptr, callAndNotify, &state)) {
         std::cerr << "FATAL: could not create background thread." << std::endl;
         return false;
     }
@@ -73,7 +73,7 @@
     if (!success) {
         pthread_kill(thread, SIGINT);
     }
-    pthread_join(thread, NULL);
+    pthread_join(thread, nullptr);
     return success;
 }
 
diff --git a/cmds/rawbu/backup.cpp b/cmds/rawbu/backup.cpp
index 0072281..8b20e3e 100644
--- a/cmds/rawbu/backup.cpp
+++ b/cmds/rawbu/backup.cpp
@@ -38,7 +38,7 @@
 static struct stat statBuffer;
 
 static char copyBuffer[8192];
-static char *backupFilePath = NULL;
+static char *backupFilePath = nullptr;
 
 static uint32_t inputFileVersion;
 
@@ -58,7 +58,7 @@
     { "/data/system/batterystats.bin", SPECIAL_NO_TOUCH },
     { "/data/system/location", SPECIAL_NO_TOUCH },
     { "/data/dalvik-cache", SPECIAL_NO_BACKUP },
-    { NULL, 0 },
+    { nullptr, 0 },
 };
 
 /* This is just copied from the shell's built-in wipe command. */
@@ -71,7 +71,7 @@
 
     dir = opendir(path);
 
-    if (dir == NULL) {
+    if (dir == nullptr) {
         fprintf (stderr, "Error opendir'ing %s: %s\n",
                     path, strerror(errno));
         return 0;
@@ -87,7 +87,7 @@
     for (;;) {
         de = readdir(dir);
 
-        if (de == NULL) {
+        if (de == nullptr) {
             break;
         }
 
@@ -115,7 +115,7 @@
             }
         }
         
-        if (!noBackup && SKIP_PATHS[i].path != NULL) {
+        if (!noBackup && SKIP_PATHS[i].path != nullptr) {
             // This is a SPECIAL_NO_TOUCH directory.
             continue;
         }
@@ -203,7 +203,7 @@
         int amt = size > (off_t)sizeof(copyBuffer) ? sizeof(copyBuffer) : (int)size;
         int readLen = fread(copyBuffer, 1, amt, src);
         if (readLen <= 0) {
-            if (srcName != NULL) {
+            if (srcName != nullptr) {
                 fprintf(stderr, "unable to read source (%d of %ld bytes) file '%s': %s\n",
                     amt, origSize, srcName, errno != 0 ? strerror(errno) : "unexpected EOF");
             } else {
@@ -214,7 +214,7 @@
         }
         int writeLen = fwrite(copyBuffer, 1, readLen, dest); 
         if (writeLen != readLen) {
-            if (destName != NULL) {
+            if (destName != nullptr) {
                 fprintf(stderr, "unable to write file (%d of %d bytes) '%s': '%s'\n",
                     writeLen, readLen, destName, strerror(errno));
             } else {
@@ -256,14 +256,14 @@
 {
     DIR *dir;
     struct dirent *de;
-    char* fullPath = NULL;
+    char* fullPath = nullptr;
     int srcLen = strlen(srcPath);
     int result = 1;
     int i;
     
     dir = opendir(srcPath);
 
-    if (dir == NULL) {
+    if (dir == nullptr) {
         fprintf (stderr, "error opendir'ing '%s': %s\n",
                     srcPath, strerror(errno));
         return 0;
@@ -272,7 +272,7 @@
     for (;;) {
         de = readdir(dir);
 
-        if (de == NULL) {
+        if (de == nullptr) {
             break;
         }
 
@@ -283,7 +283,7 @@
             continue;
         }
 
-        if (fullPath != NULL) {
+        if (fullPath != nullptr) {
             free(fullPath);
         }
         fullPath = (char*)malloc(srcLen + strlen(de->d_name) + 2);
@@ -298,7 +298,7 @@
                     break;
                 }
             }
-            if (SKIP_PATHS[i].path != NULL) {
+            if (SKIP_PATHS[i].path != nullptr) {
                 continue;
             }
         }
@@ -343,14 +343,14 @@
             }
             
             FILE* src = fopen(fullPath, "r");
-            if (src == NULL) {
+            if (src == nullptr) {
                 fprintf(stderr, "unable to open source file '%s': %s\n",
                     fullPath, strerror(errno));
                 result = 0;
                 goto done;
             }
             
-            int copyres = copy_file(fh, src, size, NULL, fullPath);
+            int copyres = copy_file(fh, src, size, nullptr, fullPath);
             fclose(src);
             if (!copyres) {
                 result = 0;
@@ -360,7 +360,7 @@
     }
 
 done:
-    if (fullPath != NULL) {
+    if (fullPath != nullptr) {
         free(fullPath);
     }
     
@@ -374,7 +374,7 @@
     int res = -1;
     
     FILE* fh = fopen(destPath, "w");
-    if (fh == NULL) {
+    if (fh == nullptr) {
         fprintf(stderr, "unable to open destination '%s': %s\n",
                 destPath, strerror(errno));
         return -1;
@@ -504,7 +504,7 @@
     int res = -1;
     
     FILE* fh = fopen(srcPath, "r");
-    if (fh == NULL) {
+    if (fh == nullptr) {
         fprintf(stderr, "Unable to open source '%s': %s\n",
                 srcPath, strerror(errno));
         return -1;
@@ -534,7 +534,7 @@
 
     while (1) {
         int type;
-        char* path = NULL;
+        char* path = nullptr;
         if (read_header(fh, &type, &path, &statBuffer) == 0) {
             goto done;
         }
@@ -570,14 +570,14 @@
             printf("Restoring file %s...\n", path);
             
             FILE* dest = fopen(path, "w");
-            if (dest == NULL) {
+            if (dest == nullptr) {
                 fprintf(stderr, "unable to open destination file '%s': %s\n",
                     path, strerror(errno));
                 free(path);
                 goto done;
             }
             
-            int copyres = copy_file(dest, fh, size, path, NULL);
+            int copyres = copy_file(dest, fh, size, path, nullptr);
             fclose(dest);
             if (!copyres) {
                 free(path);
diff --git a/cmds/service/service.cpp b/cmds/service/service.cpp
index bc11256..34a3fdc 100644
--- a/cmds/service/service.cpp
+++ b/cmds/service/service.cpp
@@ -30,7 +30,7 @@
 
 void writeString16(Parcel& parcel, const char* string)
 {
-    if (string != NULL)
+    if (string != nullptr)
     {
         parcel.writeString16(String16(string));
     }
@@ -43,7 +43,7 @@
 // get the name of the generic interface we hold a reference to
 static String16 get_interface_name(sp<IBinder> service)
 {
-    if (service != NULL) {
+    if (service != nullptr) {
         Parcel data, reply;
         status_t err = service->transact(IBinder::INTERFACE_TRANSACTION, data, &reply);
         if (err == NO_ERROR) {
@@ -93,7 +93,7 @@
 #endif
     sp<IServiceManager> sm = defaultServiceManager();
     fflush(stdout);
-    if (sm == NULL) {
+    if (sm == nullptr) {
         aerr << "service: Unable to get default service manager!" << endl;
         return 20;
     }
@@ -106,7 +106,7 @@
             if (optind < argc) {
                 sp<IBinder> service = sm->checkService(String16(argv[optind]));
                 aout << "Service " << argv[optind] <<
-                    (service == NULL ? ": not found" : ": found") << endl;
+                    (service == nullptr ? ": not found" : ": found") << endl;
             } else {
                 aerr << "service: No service specified for check" << endl;
                 wantsUsage = true;
@@ -131,7 +131,7 @@
                 sp<IBinder> service = sm->checkService(String16(argv[optind++]));
                 String16 ifName = get_interface_name(service);
                 int32_t code = atoi(argv[optind++]);
-                if (service != NULL && ifName.size() > 0) {
+                if (service != nullptr && ifName.size() > 0) {
                     Parcel data, reply;
 
                     // the interface name is first
@@ -186,28 +186,28 @@
                             data.writeDouble(atof(argv[optind++]));
                         } else if (strcmp(argv[optind], "null") == 0) {
                             optind++;
-                            data.writeStrongBinder(NULL);
+                            data.writeStrongBinder(nullptr);
                         } else if (strcmp(argv[optind], "intent") == 0) {
                         	
-                        	char* action = NULL;
-                        	char* dataArg = NULL;
-                        	char* type = NULL;
+                        	char* action = nullptr;
+                        	char* dataArg = nullptr;
+                        	char* type = nullptr;
                         	int launchFlags = 0;
-                        	char* component = NULL;
+                        	char* component = nullptr;
                         	int categoryCount = 0;
                         	char* categories[16];
                         	
-                        	char* context1 = NULL;
+                        	char* context1 = nullptr;
                         	
                             optind++;
                             
                         	while (optind < argc)
                         	{
                         		char* key = strtok_r(argv[optind], "=", &context1);
-                        		char* value = strtok_r(NULL, "=", &context1);
+                        		char* value = strtok_r(nullptr, "=", &context1);
                                 
                                 // we have reached the end of the XXX=XXX args.
-                                if (key == NULL) break;
+                                if (key == nullptr) break;
                         		
                         		if (strcmp(key, "action") == 0)
                         		{
@@ -231,14 +231,14 @@
                         		}
                         		else if (strcmp(key, "categories") == 0)
                         		{
-                        			char* context2 = NULL;
+                        			char* context2 = nullptr;
                         			int categoryCount = 0;
                         			categories[categoryCount] = strtok_r(value, ",", &context2);
                         			
-                        			while (categories[categoryCount] != NULL)
+                        			while (categories[categoryCount] != nullptr)
                         			{
                         				categoryCount++;
-                        				categories[categoryCount] = strtok_r(NULL, ",", &context2);
+                        				categories[categoryCount] = strtok_r(nullptr, ",", &context2);
                         			}
                         		}
                                 
diff --git a/cmds/surfacereplayer/replayer/Main.cpp b/cmds/surfacereplayer/replayer/Main.cpp
index 7090bdb..fbfcacf 100644
--- a/cmds/surfacereplayer/replayer/Main.cpp
+++ b/cmds/surfacereplayer/replayer/Main.cpp
@@ -94,7 +94,7 @@
     }
 
     char** input = argv + optind;
-    if (input[0] == NULL) {
+    if (input[0] == nullptr) {
         std::cerr << "No trace file provided...exiting" << std::endl;
         abort();
     }