Re: [Qemu-devel] [RFC 12/20] add visitor for parsing hz[KMG] input string

[Igor Mammedov <imammedo@redhat.com>]

----- Original Message -----
> From: "Andreas Färber" <afaerber@suse.de>
> To: "Igor Mammedov" <imammedo@redhat.com>
> Cc: qemu-devel@nongnu.org, gleb@redhat.com, lersek@redhat.com, pbonzini@redhat.com, stefanha@linux.vnet.ibm.com,
> mdroth@linux.vnet.ibm.com, akong@redhat.com, ehabkost@redhat.com, aliguori@us.ibm.com, mtosatti@redhat.com, "jan
> kiszka" <jan.kiszka@siemens.com>, blauwirbel@gmail.com, avi@redhat.com
> Sent: Friday, August 10, 2012 1:57:42 PM
> Subject: Re: [RFC 12/20] add visitor for parsing hz[KMG] input string
> 
> Am 10.08.2012 13:22, schrieb Igor Mammedov:
> > Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> > ---
> >  qapi/qapi-visit-core.c      | 11 +++++++++++
> >  qapi/qapi-visit-core.h      |  2 ++
> >  qapi/string-input-visitor.c | 22 ++++++++++++++++++++++
> >  3 files changed, 35 insertions(+)
> > 
> > diff --git a/qapi/qapi-visit-core.c b/qapi/qapi-visit-core.c
> > index 7a82b63..322cfa6 100644
> > --- a/qapi/qapi-visit-core.c
> > +++ b/qapi/qapi-visit-core.c
> > @@ -311,3 +311,14 @@ void input_type_enum(Visitor *v, int *obj,
> > const char *strings[],
> >      g_free(enum_str);
> >      *obj = value;
> >  }
> > +
> > +void visit_type_hz(Visitor *v, int64_t *obj, const char *name,
> > Error **errp)
> > +{
> > +    if (!error_is_set(errp)) {
> > +        if (v->type_hz) {
> > +            v->type_hz(v, obj, name, errp);
> > +        } else {
> > +            v->type_int(v, obj, name, errp);
> > +        }
> > +    }
> > +}
> > diff --git a/qapi/qapi-visit-core.h b/qapi/qapi-visit-core.h
> > index 60aceda..29d3038 100644
> > --- a/qapi/qapi-visit-core.h
> > +++ b/qapi/qapi-visit-core.h
> > @@ -62,6 +62,7 @@ struct Visitor
> >      void (*type_int64)(Visitor *v, int64_t *obj, const char *name,
> >      Error **errp);
> >      /* visit_type_size() falls back to (*type_uint64)() if
> >      type_size is unset */
> >      void (*type_size)(Visitor *v, uint64_t *obj, const char *name,
> >      Error **errp);
> > +    void (*type_hz)(Visitor *v, int64_t *obj, const char *name,
> > Error **errp);
> >  };
> >  
> >  void visit_start_handle(Visitor *v, void **obj, const char *kind,
> > @@ -91,5 +92,6 @@ void visit_type_size(Visitor *v, uint64_t *obj,
> > const char *name, Error **errp);
> >  void visit_type_bool(Visitor *v, bool *obj, const char *name,
> >  Error **errp);
> >  void visit_type_str(Visitor *v, char **obj, const char *name,
> >  Error **errp);
> >  void visit_type_number(Visitor *v, double *obj, const char *name,
> >  Error **errp);
> > +void visit_type_hz(Visitor *v, int64_t *obj, const char *name,
> > Error **errp);
> >  
> >  #endif
> > diff --git a/qapi/string-input-visitor.c
> > b/qapi/string-input-visitor.c
> > index 497eb9a..32e3780 100644
> > --- a/qapi/string-input-visitor.c
> > +++ b/qapi/string-input-visitor.c
> > @@ -110,6 +110,27 @@ static void parse_start_optional(Visitor *v,
> > bool *present,
> >      *present = true;
> >  }
> >  
> > +static void parse_type_hz(Visitor *v, int64_t *obj, const char
> > *name,
> > +                             Error **errp)
> > +{
> > +    StringInputVisitor *siv = DO_UPCAST(StringInputVisitor,
> > visitor, v);
> > +    char *endp = (char *) siv->string;
> > +    long long val;
> > +
> > +    errno = 0;
> > +    if (siv->string) {
> > +        val = strtosz_suffix_unit(siv->string, &endp,
> > +                             STRTOSZ_DEFSUFFIX_B, 1000);
> > +    }
> > +    if (!siv->string || val == -1 || *endp) {
> > +        error_set(errp, QERR_INVALID_PARAMETER_VALUE, name,
> > +              "a value representible as a non-negative int64");
> 
> Thunderbird suggests "representable".
copy paste error, I'll fix source and here.

> 
> > +        return;
> > +    }
> > +
> > +    *obj = val;
> > +}
> > +
> >  Visitor *string_input_get_visitor(StringInputVisitor *v)
> >  {
> >      return &v->visitor;
> > @@ -132,6 +153,7 @@ StringInputVisitor
> > *string_input_visitor_new(const char *str)
> >      v->visitor.type_str = parse_type_str;
> >      v->visitor.type_number = parse_type_number;
> >      v->visitor.start_optional = parse_start_optional;
> > +    v->visitor.type_hz = parse_type_hz;
> >  
> >      v->string = str;
> >      return v;
> 
> I would prefer to stay physically exact and do s/hz/freq/g. ;)
I'll do it next respin.

> 
> Seems like a good idea to have a specialized visitor, didn't think of
> that. Quite possibly there's use cases beyond tsc_freq that we might
> want to switch as follow-ups.
> 
> Regards,
> Andreas
> 
> --
> SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany
> GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG
> Nürnberg
> 
Thanks,
  Igor