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From: David Thompson <dave.thompson2@verizon.net>
Newsgroups: comp.lang.ada
Subject: Re: Running a preprocessor from GPS?
Date: Sun, 30 Aug 2015 03:03:59 -0400
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On Thu, 30 Jul 2015 16:55:52 +0300, Niklas Holsti
<niklas.holsti@tidorum.invalid> wrote:
<snip>
> Some printf's support, in the "%" conversion specifications, an initial 
> part of the form "%12$" to say that the argument to be converted is 
> argument number 12 in the argument list. So the format string can pick 
> the arguments in any order it wants -- even converting the same argument 
> several times.
> 
> (I did not find this feature in the C99 standard. I don't know how 
> widely it is supported.)
> 
It's not in any C standard to date. It is in POSIX, marked XSI meaning
"extension to the C standard", and has been as long as I remember.
POSIX is pretty widely supported.