Re: [PATCH v2] perf tools: Remove cast of non-variadic function to variadic

[Michael Hudson-Doyle <michael.hudson@linaro.org>]

Arnaldo Carvalho de Melo <acme@redhat.com> writes:

> Em Thu, Oct 31, 2013 at 04:47:45PM -0700, Michael Hudson-Doyle escreveu:
>> -int percent_color_snprintf(char *bf, size_t size, const char *fmt, double percent)
>> +int percent_color_snprintf(char *bf, size_t size, const char *fmt, ...)
>>  {
>> -	const char *color = get_percent_color(percent);
>> +	va_list args;
>> +	double percent;
>> +	const char *color;
>> +
>> +	va_start(args, fmt);
>> +	percent = va_arg(args, double);
>> +	va_end(args);
>> +	color = get_percent_color(percent);
>>  	return color_snprintf(bf, size, color, fmt, percent);
>>  }
>
> As a bug fix I'm merging this now, but I wonder if, since we're doing
> the va_start/end dance here, can't we call some color_vsnprintf variant
> so as to avoid doing it twice?

I thought that, but we need to get the percent argument anyway.  I
couldn't decide if it was better to call color_vsnprintf with args or
color_snprintf with percent so I went for the laziest option / minimal
diff.  Can clearly write a patch for the alternative if you like...

> I'll look into that after going thru more urgent stuff.

Thanks!

Cheers,
mwh