[CM] Port output function receives string 1 char at a time

[vladimir florentino]

My personal usecase for wanting a single string is more basic, though.
In the callback, I log the display to a gui console. The console adds
a new entry everytime it is called. When receiving that data, there is
no indication of when the string stream ended. So, to log the string
as 1 entry starts involving buffering the data and checking and
logging it later. To me, seems backwards of how it should be: if
someone wants to loop over the data, they can do it using the pointer
and the length when the receive the callback. I understand it's there
for historical reasons, but still -- the requirement of a client
application leaked into the api of the runtime. I'm raising my hand to
add a normal version of that function.

On Sun, Nov 20, 2022 at 6:03 AM vladimir florentino
<optimusvlad at gmail.com> wrote:
>
> Sounds good. But, please, do consider providing a way to receive that
> string as a single value. The functionality is already present, it
> just needs a little extra to be exposed.
>
> I don't know if I consider this a minor optimization. If the Scheme
> side deals with long strings, say by receiving large xml payload from
> an RPC call, invoking a function once for each character, just to
> reassemble the data again, is an unnecessary use of cpu cycles.
>
> Thanks
>
> On Sun, Nov 20, 2022 at 5:49 AM <bil at ccrma.stanford.edu> wrote:
> >
> > Thanks for the suggested code, but that is not how
> > I want to do it, if I do it at all.  This is a minor
> > optimization, so it should not introduce compile-time
> > switches that split s7 into two incompatible versions;
> > I'd have to add stuff to ffitest.c and the documentation
> > and so on.  I'll look at it later.
> >