Method append_zero

src/common/buffer.cc:1503–1525

  }

  void buffer::list::append_zero(unsigned len)
  {
    _len += len;

    const unsigned free_in_last = get_append_buffer_unused_tail_length();
    const unsigned first_round = std::min(len, free_in_last);
    if (first_round) {
      if (unlikely(_carriage != &_buffers.back())) {
        auto bptr = ptr_node::create(*_carriage, _carriage->length(), 0);
	_carriage = bptr.get();
	_buffers.push_back(*bptr.release());
        _num += 1;
      }
      _carriage->append_zeros(first_round);
    }

    const unsigned second_round = len - first_round;
    if (second_round) {
      auto& new_back = refill_append_space(second_round);
      new_back.set_length(second_round);
      new_back.zero(false);
    }
  }

  
  /*