Replace NULL with nullptr or null in webrtc/audio/ and common_audio/.

webrtc/common_audio/ring_buffer_unittest.cc

 /*
  *  Copyright (c) 2013 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 36 matching lines @@
   return starting_value;
 }
 
 // We use ASSERTs in this test to avoid obscuring the seed in the case of a
 // failure.
 static void RandomStressTest(int** data_ptr) {
   const int kNumTests = 10;
   const int kNumOps = 1000;
   const int kMaxBufferSize = 1000;
 
-  unsigned int seed = time(NULL);
+  unsigned int seed = time(nullptr);
   printf("seed=%u\n", seed);
   srand(seed);
   for (int i = 0; i < kNumTests; i++) {
     const int buffer_size = std::max(rand() % kMaxBufferSize, 1);
     std::unique_ptr<int[]> write_data(new int[buffer_size]);
     std::unique_ptr<int[]> read_data(new int[buffer_size]);
     scoped_ring_buffer buffer(WebRtc_CreateBuffer(buffer_size, sizeof(int)));
-    ASSERT_TRUE(buffer.get() != NULL);
+    ASSERT_TRUE(buffer.get() != nullptr);
     WebRtc_InitBuffer(buffer.get());
     int buffer_consumed = 0;
     int write_element = 0;
     int read_element = 0;
     for (int j = 0; j < kNumOps; j++) {
       const bool write = rand() % 2 == 0 ? true : false;
       const int num_elements = rand() % buffer_size;
       if (write) {
         const int buffer_available = buffer_size - buffer_consumed;
         ASSERT_EQ(static_cast<size_t>(buffer_available),
@@ skipping 22 matching lines @@
         }
         read_element = CheckIncrementingData(check_ptr, expected_elements,
                                              read_element);
         buffer_consumed = std::max(buffer_consumed - expected_elements, 0);
       }
     }
   }
 }
 
 TEST(RingBufferTest, RandomStressTest) {
-  int* data_ptr = NULL;
+  int* data_ptr = nullptr;
   RandomStressTest(&data_ptr);
 }
 
 TEST(RingBufferTest, RandomStressTestWithNullPtr) {
-  RandomStressTest(NULL);
+  RandomStressTest(nullptr);
 }
 
 TEST(RingBufferTest, PassingNulltoReadBufferForcesMemcpy) {
   const size_t kDataSize = 2;
   int write_data[kDataSize];
   int read_data[kDataSize];
   int* data_ptr;
 
   scoped_ring_buffer buffer(WebRtc_CreateBuffer(kDataSize, sizeof(int)));
-  ASSERT_TRUE(buffer.get() != NULL);
+  ASSERT_TRUE(buffer.get() != nullptr);
   WebRtc_InitBuffer(buffer.get());
 
   SetIncrementingData(write_data, kDataSize, 0);
   EXPECT_EQ(kDataSize, WebRtc_WriteBuffer(buffer.get(), write_data, kDataSize));
   SetIncrementingData(read_data, kDataSize, kDataSize);
   EXPECT_EQ(kDataSize, WebRtc_ReadBuffer(buffer.get(),
       reinterpret_cast<void**>(&data_ptr), read_data, kDataSize));
   // Copying was not necessary, so |read_data| has not been updated.
   CheckIncrementingData(data_ptr, kDataSize, 0);
   CheckIncrementingData(read_data, kDataSize, kDataSize);
 
   EXPECT_EQ(kDataSize, WebRtc_WriteBuffer(buffer.get(), write_data, kDataSize));
-  EXPECT_EQ(kDataSize, WebRtc_ReadBuffer(buffer.get(), NULL, read_data,
-                                         kDataSize));
-  // Passing NULL forces a memcpy, so |read_data| is now updated.
+  EXPECT_EQ(kDataSize,
+            WebRtc_ReadBuffer(buffer.get(), nullptr, read_data, kDataSize));
+  // Passing null forces a memcpy, so |read_data| is now updated.
   CheckIncrementingData(read_data, kDataSize, 0);
 }
 
 TEST(RingBufferTest, CreateHandlesErrors) {
-  EXPECT_TRUE(WebRtc_CreateBuffer(0, 1) == NULL);
-  EXPECT_TRUE(WebRtc_CreateBuffer(1, 0) == NULL);
+  EXPECT_TRUE(WebRtc_CreateBuffer(0, 1) == nullptr);
+  EXPECT_TRUE(WebRtc_CreateBuffer(1, 0) == nullptr);
   RingBuffer* buffer = WebRtc_CreateBuffer(1, 1);
-  EXPECT_TRUE(buffer != NULL);
+  EXPECT_TRUE(buffer != nullptr);
   WebRtc_FreeBuffer(buffer);
 }
 
 }  // namespace webrtc