Re: [PATCH net-next v3 1/2] lib: vsprintf: add IPv4/v6 generic %p[Ii]S[pfs]format specifier

[Daniel Borkmann]

On 06/28/2013 05:53 PM, Daniel Borkmann wrote:
> On 06/28/2013 05:44 PM, Joe Perches wrote:
> > On Fri, 2013-06-28 at 14:05 +0200, Daniel Borkmann wrote:
> > > In order to avoid making code that deals with printing both, IPv4 and
> > > IPv6 addresses, unnecessary complicated as for example ...
> >
> > Thanks Daniel, seems sensible.  Just trivial comments...
>
> Ok, thanks.
>
> > []
> >
> > > diff --git a/lib/vsprintf.c b/lib/vsprintf.c
> > []
> >
> > Should any other include other than net/addrconf be needed?

Ah, you mean net/addrconf.h, ok got it. Hm, well, I've compiled and tested it, no
warning or error on my side.

> I'm not sure I understand this question.
>
> > > +char *ip6_addr_string_sa(char *buf, char *end, const struct sockaddr_in6 *sa,
> > > +             struct printf_spec spec, const char *fmt)
> > > +{
> > []
> > > +    char fmt6[2] = { fmt[0], '6'};
> >
> > This looks odd to me.  why not use a bool compressed
> > flag and identify this before the isalpha loop and not
> > have fmt6 at all?
>
> Well, we have a bool called 'have_c' that identifies if 'c' was specified. To have
> the same behaviour as with %pI6, this is used to create a temporary fmt that we then
> can pass to ip6_string(). If you look at ip6_addr_string(), it's done the same way,
> and by that, we stay compatible in behaviour.
>
> > > +    u8 off = 0;
> > > +
> > > +    fmt++;
> > > +    while (isalpha(*++fmt)) {
> > > +        switch (*fmt) {
> > > +        case 'p':
> > > +            have_p = true;
> > > +            break;
> > > +        case 'f':
> > > +            have_f = true;
> > > +            break;
> > > +        case 's':
> > > +            have_s = true;
> > > +            break;
> > > +        case 'c':
> > > +            have_c = true;
> > > +            break;
> > > +        }
> > > +    }
> --
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