Re: [PATCH v6 11/12] lib/vsprintf: Add %pfw conversion specifier for printing fwnode names

Sakari Ailus
2019-09-18T13:11:14Z

Hi Joe,

On Tue, Sep 10, 2019 at 03:21:26AM -0700, Joe Perches wrote:
> > @@ -5988,14 +5988,17 @@ sub process {
> > for (my $count = $linenr; $count <= $lc; $count++) {
> > my $specifier;
> > my $extension;
> > + my $qualifier;
> > my $bad_specifier = "";
> > my $fmt = get_quoted_string($lines[$count - 1], raw_line($count, 0));
> > $fmt =~ s/%%//g;
> >
> > - while ($fmt =~ /(\%[\*\d\.]*p(\w))/g) {
> > + while ($fmt =~ /(\%[\*\d\.]*p(\w)(\w?))/g) {
>
> This is not generic enough to allow all possible qualifiers
> to be captured.
>
> This should be something like:
>
> while ($fmt =~ /(\%[\*\d\.]*p(\w)(\w*))/g) {
>
> > $specifier = $1;
> > $extension = $2;
> > - if ($extension !~ /[SsBKRraEhMmIiUDdgVCbGNOxt]/) {
> > + $qualifier = $3;
> > + if ($extension !~ /[SsBKRraEhMmIiUDdgVCbGNOxtf]/ ||
> > + ($extension eq "f" && $qualifier ne "w")) {
>
>
> And this should likely test
> (defined $qualifier &&
> $extension eq 'f' && $qualifier =~ /^w/))
>
> > $bad_specifier = $specifier;
> > last;
> > }
>
> And here the 'f' isn't really a bad $specifier,
> it does not have the correct 'w' $extension.
>
> The valid extensions may change in the future and
> this code isn't particularly manageable, so I
> think the $specifier/$extension pair should likely
> have some additional testing after validating
> the $specifier.

There are certainly possibilities of having qualifiers that aren't
supported but extensions are also allowed to be followed by any other
characters, so this is a bit grey area.

I'll make the qualifier one or more letters for v7 as you suggested.

--
Regards,

Sakari Ailus
sakari.ailus@linux.intel.com