[ruby-dev:10309] Telnet#preprocess

ごとうゆうぞうです。

Net::Telnet で遊んでいて思ったのですが、preprocess にある、
以下の正規表現なのですが、

      string.gsub(/#{IAC}(
                   [#{IAC}#{AO}#{AYT}#{DM}#{IP}#{NOP}]|
                   [#{DO}#{DONT}#{WILL}#{WONT}]
                     [#{OPT_BINARY}-#{OPT_NEW_ENVIRON}#{OPT_EXOPL}]|
                   #{SB}[^#{IAC}]*#{IAC}#{SE}
                 )/xno) do

データとして IAC が送出される場合について、RFC854 に

   This format was chosen so that as more comprehensive use
   of the "data space" is made -- by negotiations from the basic NVT, of
   course -- collisions of data bytes with reserved command values will
   be minimized, all such collisions requiring the inconvenience, and
   inefficiency, of "escaping" the data bytes into the stream.  With the
   current set-up, only the IAC need be doubled to be sent as data, and
   the other 255 codes may be passed transparently.

とあるので、

      string.gsub(/#{IAC}(
                   [#{AO}#{AYT}#{DM}#{IP}#{NOP}]|
                   [#{DO}#{DONT}#{WILL}#{WONT}]
                     [#{OPT_BINARY}-#{OPT_NEW_ENVIRON}#{OPT_EXOPL}]|
                   #{SB}.([^#{IAC}]|#{IAC}#{IAC})*#{IAC}#{SE}
                 )/xno) do

くらいがいいように思います。

--
ごとうゆうぞう