More bugs.

[Vadim Antonov avg@postman.ncube.com]

/sys/src/cmd/auth/lib/readln didn't turn raw mode off
before sending newline (which caused some funny behaviour
if the server translates the newline differently in
raw and cooked modes).  Also, in some cases closed
stream could be interpreted as DEL by readln.

The quick fix is appended.  As always, the real fix
would be to make echo-on and echo-off _separate_
from raw-on and raw-off.  I remember seeing the same
kind of problem in Unix version 6.  I guess aliens from
outer space kept somebody in suspended animation all
those years :)


--vadim

naiad% pwd
/sys/src/cmd/auth/lib
naiad% diff readln.c.old readln.c
49,50d48
<               if(*p == 0x7f)
<                       exits(0);
53c51,52
<                       if(raw)
---
>                       if(raw) {
>                               write(ctl, "rawoff", 6);
54a54
>                       }
58a59,60
>               if(*p == 0x7f)
>                       exits(0);
naiad%