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

["Andreas Färber" <afaerber@suse.de>]

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".

> +        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. ;)

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

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