Re: Replacement for string-as-unibyte-function

[Stefan Monnier]

>> So make sure the buffer in which the process writes is unibyte with
>> 
>>     (set-buffer-multibyte nil)
>> 
>> and make sure Emacs doesn't try to decode the process's output:
>> 
>>     (set-process-coding-system <proc> 'binary)
>> 
>> (which you can also set directly when you launch the process, but how
>> you do it depends on the function you use to create the process).
>
> I'm actually using make-network-process (to communicate via tls).  

Then use something like

    (make-network-process ... :coding 'binary ...)
or
    (make-network-process ... :coding '(binary . utf-8) ...)

> The filter function inserts the string into a buffer.  

Emacs receives the data from the process as a sequence of *bytes* (after
all, that's the only thing available in POSIX communication).  So in
order to pass a sequence of *chars* (aka "a multibyte string") to the
process filter, Emacs's internal C code has to do the equivalent of

    (*de*code-coding-string "thedatareceived" '<somecodingsystem>)

where <somecodingsystem> is the coding system that
`make-network-process` decided to use for that process.
And then you come along and want to call `encode-coding-string` on the
result: better use `:coding` as I suggested above in order to cut the
middle man.


        Stefan