Replace NULL with nullptr in all C++ files.

webrtc/system_wrappers/source/trace_impl.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 26 matching lines @@
 volatile int Trace::level_filter_ = kTraceDefault;
 
 // Construct On First Use idiom. Avoids "static initialization order fiasco".
 TraceImpl* TraceImpl::StaticInstance(CountOperation count_operation,
                                      const TraceLevel level) {
   // Sanities to avoid taking lock unless absolutely necessary (for
   // performance reasons). count_operation == kAddRefNoCreate implies that a
   // message will be written to file.
   if ((level != kTraceAll) && (count_operation == kAddRefNoCreate)) {
     if (!(level & level_filter())) {
-      return NULL;
+      return nullptr;
     }
   }
   TraceImpl* impl =
     GetStaticInstance<TraceImpl>(count_operation);
   return impl;
 }
 
 TraceImpl* TraceImpl::GetTrace(const TraceLevel level) {
   return StaticInstance(kAddRefNoCreate, level);
 }
 
 TraceImpl* TraceImpl::CreateInstance() {
 #if defined(_WIN32)
   return new TraceWindows();
 #else
   return new TracePosix();
 #endif
 }
 
 TraceImpl::TraceImpl()
-    : callback_(NULL),
+    : callback_(nullptr),
       row_count_text_(0),
       file_count_text_(0),
-      trace_file_(FileWrapper::Create()) {
-}
+      trace_file_(FileWrapper::Create()) {}
 
 TraceImpl::~TraceImpl() {
   trace_file_->CloseFile();
 }
 
 int32_t TraceImpl::AddThreadId(char* trace_message) const {
   uint32_t thread_id = rtc::CurrentThreadId();
   // Messages is 12 characters.
   return sprintf(trace_message, "%10u; ", thread_id);
 }
@@ skipping 236 matching lines @@
 }
 
 int32_t TraceImpl::AddMessage(
     char* trace_message,
     const char msg[WEBRTC_TRACE_MAX_MESSAGE_SIZE],
     const uint16_t written_so_far) const {
   int length = 0;
   if (written_so_far >= WEBRTC_TRACE_MAX_MESSAGE_SIZE) {
     return -1;
   }
-  // - 2 to leave room for newline and NULL termination.
+// - 2 to leave room for newline and null termination.
 #ifdef _WIN32
   length = _snprintf(trace_message,
                      WEBRTC_TRACE_MAX_MESSAGE_SIZE - written_so_far - 2,
                      "%s", msg);
   if (length < 0) {
     length = WEBRTC_TRACE_MAX_MESSAGE_SIZE - written_so_far - 2;
     trace_message[length] = 0;
   }
 #else
   length = snprintf(trace_message,
                     WEBRTC_TRACE_MAX_MESSAGE_SIZE - written_so_far - 2,
                     "%s", msg);
   if (length < 0 ||
       length > WEBRTC_TRACE_MAX_MESSAGE_SIZE - written_so_far - 2) {
     length = WEBRTC_TRACE_MAX_MESSAGE_SIZE - written_so_far - 2;
     trace_message[length] = 0;
   }
 #endif
-  // Length with NULL termination.
+  // Length with null termination.
   return length + 1;
 }
 
 void TraceImpl::AddMessageToList(
     const char trace_message[WEBRTC_TRACE_MAX_MESSAGE_SIZE],
     const uint16_t length,
     const TraceLevel level) {
   rtc::CritScope lock(&crit_);
   if (callback_)
     callback_->Print(level, trace_message, length);
@@ skipping 215 matching lines @@
         va_end(args);
         buff = temp_buff;
       }
       trace->AddImpl(level, module, id, buff);
     }
     ReturnTrace();
   }
 }
 
 }  // namespace webrtc