[Bug 1719758] Re: telnet send IAC ABORT in some Tranditional Chinese UTF-8 character

[Camilio]

The same problem happens with other UTF8 characters, like Ü or Ï.
For instance, Ü is coded as 0xC3 0x9C. As telnet is basically 7-bits, 0x9C is seen as 0x1C, which is Ctrl-O. And Ctrl-O is used to flushoutput.
So, telnet sends the 0xC3, then send the flushoutput IAC sequence.
本 is coded as 0xe6 0x9c 0xac, so there is also the Ctrl-O found inside.

To make it work, you need to deactivate some control codes, like those at least:
```
set flushoutput off
set quit off
```

Then netkit-telnet package should be corrected to detect UTF8 sequences
and to ignore extra UTF8 bytes for control sequences.

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https://bugs.launchpad.net/bugs/1719758

Title:
  telnet send IAC ABORT in some Tranditional Chinese UTF-8 character

Status in netkit-telnet package in Ubuntu:
  Confirmed

Bug description:
  When I telnet to some MUD server and chat,
  > say 本
  telnet client send 'IAC ABORT's, and MUD server get the wrong input.

  
  1. what telnet send :
  telnet> toggle
  Need an argument to 'toggle' command.  'toggle ?' for help.
  telnet> toggle options
  Will show option processing.
  say 本               
  SENT IAC ABORT
  SENT DO TIMING MARK

  
  2. What MUD server received (from strace)
  readv(8, [{"say \346\377\356\377\375\6", 10}], 1) = 10
  epoll_ctl(3, EPOLL_CTL_MOD, 8, {EPOLLIN|EPOLLOUT, {u32=8, u64=8}}) = 0
  writev(8, [{"\377\373\6", 3}], 1)       = 3


  '本' is 0xe6,0xac,0x9c
  but the MUD server got :
  0xe6, 0xff, 0xee, 0xff, 0xfd, 0x06

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