[Bug 276220] tty_disc canonical input processing: suprising behavior of the EOF cchar

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276220

Kyle Evans <kevans@freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|New                         |In Progress
           Assignee|standards@FreeBSD.org       |kevans@freebsd.org
                 CC|                            |kevans@freebsd.org

--- Comment #2 from Kyle Evans <kevans@freebsd.org> ---
Created attachment 247547
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=247547&action=edit
git(1) diff against base

I agree with your interpretation of the spec; I think we want something like
the attached patch... it searches one past the buffer size for an EOF.  If we
find it there, then we will trim it; if we don't, then the next read() will
return the remaining portion of the line and optionally trim the EOF (if
found).

The tty_inq.c portion of the patch just fixes a bogus assertion; if you read
later in the function, you'll note that `clen` (thus, `rlen`) is assumed to
include `flen`, so we shouldn't bomb out if we're trimming the excess past the
remainder of the buffer.

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