Method append

src/common/buffer.cc:582–590

  }

  unsigned buffer::ptr::append(char c)
  {
    ceph_assert(_raw);
    ceph_assert(1 <= unused_tail_length());
    char* ptr = _raw->get_data() + _off + _len;
    *ptr = c;
    _len++;
    return _len + _off;
  }

  unsigned buffer::ptr::append(const char *p, unsigned l)
  {