util/posix_logger.h [70:126]:
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          thread_id.c_str());

      // The header can be at most 28 characters (10 date + 15 time +
      // 3 delimiters) plus the thread ID, which should fit comfortably into the
      // static buffer.
      assert(buffer_offset <= 28 + kMaxThreadIdSize);
      static_assert(28 + kMaxThreadIdSize < kStackBufferSize,
                    "stack-allocated buffer may not fit the message header");
      assert(buffer_offset < buffer_size);

      // Print the message into the buffer.
      std::va_list arguments_copy;
      va_copy(arguments_copy, arguments);
      buffer_offset +=
          std::vsnprintf(buffer + buffer_offset, buffer_size - buffer_offset,
                         format, arguments_copy);
      va_end(arguments_copy);

      // The code below may append a newline at the end of the buffer, which
      // requires an extra character.
      if (buffer_offset >= buffer_size - 1) {
        // The message did not fit into the buffer.
        if (iteration == 0) {
          // Re-run the loop and use a dynamically-allocated buffer. The buffer
          // will be large enough for the log message, an extra newline and a
          // null terminator.
          dynamic_buffer_size = buffer_offset + 2;
          continue;
        }

        // The dynamically-allocated buffer was incorrectly sized. This should
        // not happen, assuming a correct implementation of std::(v)snprintf.
        // Fail in tests, recover by truncating the log message in production.
        assert(false);
        buffer_offset = buffer_size - 1;
      }

      // Add a newline if necessary.
      if (buffer[buffer_offset - 1] != '\n') {
        buffer[buffer_offset] = '\n';
        ++buffer_offset;
      }

      assert(buffer_offset <= buffer_size);
      std::fwrite(buffer, 1, buffer_offset, fp_);
      std::fflush(fp_);

      if (iteration != 0) {
        delete[] buffer;
      }
      break;
    }
  }

 private:
  std::FILE* const fp_;
};
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util/windows_logger.h [64:120]:
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          thread_id.c_str());

      // The header can be at most 28 characters (10 date + 15 time +
      // 3 delimiters) plus the thread ID, which should fit comfortably into the
      // static buffer.
      assert(buffer_offset <= 28 + kMaxThreadIdSize);
      static_assert(28 + kMaxThreadIdSize < kStackBufferSize,
                    "stack-allocated buffer may not fit the message header");
      assert(buffer_offset < buffer_size);

      // Print the message into the buffer.
      std::va_list arguments_copy;
      va_copy(arguments_copy, arguments);
      buffer_offset +=
          std::vsnprintf(buffer + buffer_offset, buffer_size - buffer_offset,
                         format, arguments_copy);
      va_end(arguments_copy);

      // The code below may append a newline at the end of the buffer, which
      // requires an extra character.
      if (buffer_offset >= buffer_size - 1) {
        // The message did not fit into the buffer.
        if (iteration == 0) {
          // Re-run the loop and use a dynamically-allocated buffer. The buffer
          // will be large enough for the log message, an extra newline and a
          // null terminator.
          dynamic_buffer_size = buffer_offset + 2;
          continue;
        }

        // The dynamically-allocated buffer was incorrectly sized. This should
        // not happen, assuming a correct implementation of std::(v)snprintf.
        // Fail in tests, recover by truncating the log message in production.
        assert(false);
        buffer_offset = buffer_size - 1;
      }

      // Add a newline if necessary.
      if (buffer[buffer_offset - 1] != '\n') {
        buffer[buffer_offset] = '\n';
        ++buffer_offset;
      }

      assert(buffer_offset <= buffer_size);
      std::fwrite(buffer, 1, buffer_offset, fp_);
      std::fflush(fp_);

      if (iteration != 0) {
        delete[] buffer;
      }
      break;
    }
  }

 private:
  std::FILE* const fp_;
};
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