Re: [PATCH 15/23] perf ui/stdio: Align column header for hierarchy output

[Namhyung Kim]

On Wed, Feb 10, 2016 at 01:40:03PM +0100, Jiri Olsa wrote:
> On Fri, Feb 05, 2016 at 10:01:47PM +0900, Namhyung Kim wrote:
> > The hierarchy output mode is to group entries so the existing columns
> > won't fit to the new output.  Treat all sort keys as a single column and
> > separate headers by "/".
> > 
> >   #    Overhead  Command / Shared Object
> >   # ...........  ................................
> >   #
> >       15.11%     swapper
> >          14.97%     [kernel.vmlinux]
> >           0.09%     [libahci]
> >           0.05%     [iwlwifi]
> >   ...
> > 
> > Acked-by: Pekka Enberg <penberg@xxxxxxxxxx>
> > Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
> > ---
> >  tools/perf/ui/stdio/hist.c | 107 +++++++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 107 insertions(+)
> > 
> > diff --git a/tools/perf/ui/stdio/hist.c b/tools/perf/ui/stdio/hist.c
> > index b58f718a6afc..4bdab3cf1b6c 100644
> > --- a/tools/perf/ui/stdio/hist.c
> > +++ b/tools/perf/ui/stdio/hist.c
> > @@ -505,6 +505,108 @@ static int hist_entry__fprintf(struct hist_entry *he, size_t size,
> >  	return ret;
> >  }
> >  
> > +static int print_hierarchy_indent(const char *sep, int nr_sort,
> > +				  const char *line, FILE *fp)
> > +{
> > +	if (sep != NULL || nr_sort < 1)
> > +		return 0;
> > +
> > +	return fprintf(fp, "%-.*s", (nr_sort - 1) * HIERARCHY_INDENT, line);
> 
> hum, could you use   fprintf(fp, "%*c", nr_sort..., '.');
> 
> with the same effect to get rid of those dots and spaces strings..

Is it possible?  I already tried but it failed with the dots..

  $ cat dot.c
  #include <stdio.h>
  
  int main(void)
  {
    printf("%*c\n", 5, '.');
    return 0;
  }
  
  $ gcc dot.c
  $ ./a.out
      .
  $


Thanks,
Namhyung