[PATCH v3 01/12] perf script: Make printing flags reliable

[Leo Yan]

On Mon, Mar 03, 2025 at 06:56:42PM +0200, Adrian Hunter wrote:
> On 3/03/25 20:11, Leo Yan wrote:
> > On Mon, Mar 03, 2025 at 05:05:13PM +0200, Adrian Hunter wrote:
> > 
> > [...]
> > 
> >>>>> +	ret = max(ret, SAMPLE_FLAGS_STR_ALIGNED_SIZE);
> >>>>> +	return fprintf(fp, "  %-*s ", ret, str);
> >>>>
> >>>> -21 means the field width is 21 and left-justified.  It should not
> >>>> truncate the string.
> >>>
> >>> No, it does not truncate the string.
> >>>
> >>> It calculates a maximum value between the returned length and 21 (
> >>> defined in SAMPLE_FLAGS_STR_ALIGNED_SIZE).  It keeps left-justified and
> >>> can printing a complete string if the string length is bigger than 21.
> >>
> >> Maybe I am missing something, but that isn't that what
> >>
> >> 	return fprintf(fp, "  %-21s ", str);
> >>
> >> does anyway?  Why change it to something more complicated.
> > 
> > You are right.  I should have done an experiment for this.
> > 
> > I will remove the max() sentence and update the last line:
> > 
> >         return fprintf(fp, "  %-*s ", SAMPLE_FLAGS_STR_ALIGNED_SIZE, str);
> > 
> > Another option is to drop this patch.  But I prefer to keep it, the
> > reason is except the benefit for the debugging log, an extra reason is
> > the SAMPLE_FLAGS_STR_ALIGNED_SIZE macro is used to replace the opened
> > value '21'.  The macro also will be used by a later patch for
> > right-alignment printing.  How about you think?
> 
> Sure

Thanks a lot for confirmation and review!

I will send new version in my tomorrow.

Leo