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From: Sergey Organov <sorganov@gmail.com>
Subject: Re: What does ap in printf(3) stand for?
Date: Wed, 12 May 2021 01:53:59 +0300
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Peng Yu via Libc-help
<libc-help@sourceware.org> writes:

> https://man7.org/linux/man-pages/man3/printf.3.html
>
> It is not clear what "ap" stands for in printf(3). Could anybody
> explain what it stands for? Thanks.

ap == argument pointer:

https://stackoverflow.com/questions/24345199/what-does-ap-stand-for-in-c-examples

-- Sergey Organov