Mark H Weaver <mhw@netris.org> skribis:

> While I agree that CBIPs should be unbuffered by default, I think it's
> important to have a way to enable buffering, even if it's not portable.

So I started with the patch below, which allows us to specify which
ports (really: which port types) support ‘setvbuf’.  This is
conservative so that ports that do not explicitly claim to support it
won’t break.

Then I started modifying the CBIP.  The problem is that the CBIP has a
bytevector stored in its SCM_STREAM, whose contents are normally stored
in ‘read_buf’.  So it needs to know if a new buffer is installed.

Perhaps that, rather than a ‘supports_setvbuf’ bit, we need a pointer to
the port’s ‘setvbuf’ method?  For file ports it would be
‘scm_fport_buffer_add’, for instance.

Thoughts?

Ludo’.