[Openmcl-devel] Two streams questions

[Ron Garret]

Just what I needed.  Works like a charm.  Thanks!

On Jul 29, 2016, at 5:24 PM, Gary Byers <gb at clozure.com> wrote:

> See "ccl:library;serial-streams.lisp";  streams created via MAKE-SERIAL-STREAM as defined in that file are bivalent and INTERACTIVE-STREAM-P should be true of them.
> 
> 
> 
> On 07/29/2016 05:43 PM, Ron Garret wrote:
>> 
>> On Jul 29, 2016, at 3:42 PM, Gary Byers <gb at clozure.com> wrote:
>> 
>>> I have not tried this, looked at the code, or thought about this much,
>>> 
>>> Does
>>> 
>>> (defun read-byte-no-hang (s)
>>> (when (listen s)
>>>   (read-byte s)))
>>> 
>>> work ?
>> 
>> Unfortunately, no.  CLHS specifically says:
>> 
>> "On a non-interactive input-stream, listen returns true except when at end of file[1]”
>> 
>> (IMHO this is a bug in the spec.)
>> 
>>> Note also that a terminal device may be in one of a few "modes: (raw, cooked, cbreak) some of which may do line bufferimg (aka "rubout handling") inside the tty driver.
>> 
>> Yes, this one is in raw mode.  I’ve been able to get this to work by using a character stream with a latin-1 encoding and read-char-no-hang, but that’s a horrible hack.
>> 
>> rg
>>