old_contents: # Copyright (C) 2011 Victor Semionov
  # All rights reserved.
  # 
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions are met:
  #  * Redistributions of source code must retain the above copyright notice, this
  #    list of conditions and the following disclaimer.
  #  * Redistributions in binary form must reproduce the above copyright notice,
  #    this list of conditions and the following disclaimer in the documentation
  #    and/or other materials provided with the distribution.
  #  * Neither the name of the copyright holder nor the names of the contributors
  #    may be used to endorse or promote products derived from this software
  #    without specific prior written permission.
  # 
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  # DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  # SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  
  import io
  
  
  dict_newline = "\r\n"
  
  
  def get_sio(sock):
      sio = sock.makefile(mode="rw", encoding="utf-8", newline=dict_newline)
      return sio
  
  def read_line(sio):
      """reads a line of input
      
      The trailing EOL is stripped.
      
      throws socket.timeout, EOFError, BufferError
      """
  
      buff = io.StringIO(newline=dict_newline)
      count = 0
      have_cr = False
  
      while count < 1024:
          ch = sio.read(1)
          if not ch:
              raise EOFError("client closed the connection prematurely")
          buff.write(ch)
          count += 1
  
          if ch == '\n' and have_cr:
              return buff.getvalue().rstrip("\n")
          have_cr = ch == '\r'
      else:
          raise BufferError("client exceeded the maximum command line length")
  
  def write_line(sio, line, split=True):
      """writes a line of output
      
      The line argument should not end with an EOL.
      The first leading '.' char is doubled.
      If split is True, lines with above-maximum length are split to multiple lines.
      If split is False, lines with above-maximum length are truncated.
      """
  
      pass
  
  def write_status(sio, status, line):
      write_line(sio, "{} {}".format(status, line), split=False)
  
new_contents: # Copyright (C) 2011 Victor Semionov
  # All rights reserved.
  # 
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions are met:
  #  * Redistributions of source code must retain the above copyright notice, this
  #    list of conditions and the following disclaimer.
  #  * Redistributions in binary form must reproduce the above copyright notice,
  #    this list of conditions and the following disclaimer in the documentation
  #    and/or other materials provided with the distribution.
  #  * Neither the name of the copyright holder nor the names of the contributors
  #    may be used to endorse or promote products derived from this software
  #    without specific prior written permission.
  # 
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
  # ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  # DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  # SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  # CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  
  import io
  
  
  dict_newline = "\r\n"
  
  
  def get_sio(sock):
      sio = sock.makefile(mode="rw", encoding="utf-8", newline=dict_newline)
      return sio
  
  def read_line(sio):
      """reads a line of input
      
      The trailing EOL is stripped.
      
      throws socket.timeout, EOFError, BufferError
      """
  
      buff = io.StringIO(newline=dict_newline)
      count = 0
      have_cr = False
  
      while count < 1024:
          ch = sio.read(1)
          if not ch:
              raise EOFError("client closed the connection prematurely")
          buff.write(ch)
          count += 1
  
          if ch == '\n' and have_cr:
              return buff.getvalue().rstrip("\n")
          have_cr = ch == '\r'
      else:
          raise BufferError("client exceeded the maximum command line length")
  
  def write_line(sio, line, split=True):
      """writes a line of output
      
      The line argument should not end with an EOL.
      The first leading '.' char is doubled.
      If split is True, lines with above-maximum length are split to multiple lines.
      If split is False, lines with above-maximum length are truncated.
      """
  
      pass
  
  def write_status(sio, status, line):
      write_line(sio, "{:03d} {:s}".format(status, line), split=False)
  
subject: Enforce 3-digit status.