Re: [Xen-devel] [Qemu-devel] [PATCH v3 25/25] chardev: Let qemu_chr_write[_all] use size_t

[Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>]

Hi

On Wed, Feb 20, 2019 at 11:39 AM Daniel P. Berrangé <berrange@xxxxxxxxxx> wrote:
>
> On Wed, Feb 20, 2019 at 02:02:32AM +0100, Philippe Mathieu-Daudé wrote:
>
> > diff --git a/include/chardev/char.h b/include/chardev/char.h
> > index 0341dd1ba2..2e3b5a15ca 100644
> > --- a/include/chardev/char.h
> > +++ b/include/chardev/char.h
> > @@ -221,7 +221,7 @@ void qemu_chr_set_feature(Chardev *chr,
> >                            ChardevFeature feature);
> >  QemuOpts *qemu_chr_parse_compat(const char *label, const char *filename,
> >                                  bool permit_mux_mon);
> > -int qemu_chr_write(Chardev *s, const uint8_t *buf, int len, bool 
> > write_all);
> > +int qemu_chr_write(Chardev *s, const uint8_t *buf, size_t len, bool 
> > write_all);
>
> Seeing this cleanup reminds me that I think we ought to change
> the chardev read & write functions to take "void *buf" instead.
> as is done for regular libc  read/write functions. This would
> avoid casts in the callers between char */uint8_t *
>
> Something to think about for a future cleanup job....same applies
> for the QIOChannel APIs which take a 'char *buf', annoyingly
> different from the chardev APIs :-( Both ought to have void *buf

I fully agree, and I started that conversion some time ago, and lost
it somewhere. That should be easier than changing the sign of return
values though!

>
>
> Regards,
> Daniel
> --
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