Re: [Qemu-devel] [PATCH 13/22] add visitor for parsing hz[KMG] input string

[Igor Mammedov <imammedo@redhat.com>]

On Fri, 7 Sep 2012 18:12:00 -0400
Don Slutz <Don@cloudswitch.com> wrote:

> On 09/07/12 16:55, Igor Mammedov wrote:
> > Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> > Acked-by: Andreas Färber <afaerber@suse.de>
> > --
> > v2:
> >    * replaced _hz suffix for frequency visitor by _freq suffix
> >      suggested-by: Andreas Färber
> >    * fixed typo & extra space spotted-by: Andreas Färber
> > ---
> >   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..5c8705e 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_freq(Visitor *v, int64_t *obj, const char *name, Error **errp)
> > +{
> > +    if (!error_is_set(errp)) {
> > +        if (v->type_freq) {
> > +            v->type_freq(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..e5e7dd7 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_freq)(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_freq(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..47d2a84 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_freq(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;
> I get:
> 
> cc1: warnings being treated as errors
> qapi/string-input-visitor.c: In function 'parse_type_freq':
> qapi/string-input-visitor.c:118: error: 'val' may be used uninitialized 
> in this function
> make: *** [qapi/string-input-visitor.o] Error 1
> make: *** Waiting for unfinished jobs....

FC17 with default configure settings doesn't complain.
And I really do not see how it could be.

> Which the change:
> 
> 
> diff --git a/qapi/string-input-visitor.c b/qapi/string-input-visitor.c
> index 47d2a84..74fe395 100644
> --- a/qapi/string-input-visitor.c
> +++ b/qapi/string-input-visitor.c
> @@ -115,7 +115,7 @@ static void parse_type_freq(Visitor *v, int64_t 
> *obj, const char *name,
>   {
>       StringInputVisitor *siv = DO_UPCAST(StringInputVisitor, visitor, v);
>       char *endp = (char *) siv->string;
> -    long long val;
> +    long long val = 0;
>       errno = 0;
>       if (siv->string) {
> 
> Fixes it for me.
> 
> > +
> > +    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 representable as a non-negative int64");
> > +        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_freq = parse_type_freq;
> >   
> >       v->string = str;
> >       return v;
>    -Don Slutz


-- 
Regards,
  Igor