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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Peter Eisentraut <peter.eisentraut@enterprisedb.com>
Cc: Ranier Vilela <ranier.vf@gmail.com>
Cc: Laurenz Albe <laurenz.albe@cybertec.at>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Subject: Re: printf %s with NULL pointer (was Re: BUG #17098: Assert failed on composing an error message when adding a type to an extension being dropped)
Date: Wed, 14 Jul 2021 12:41:24 -0400
Message-ID: <3517929.1626280884@sss.pgh.pa.us> (raw)
In-Reply-To: <3517180.1626280000@sss.pgh.pa.us>
References: <17098-b960f3616c861f83@postgresql.org>
	<2468663.1626017338@sss.pgh.pa.us>
	<2984422.1626110456@sss.pgh.pa.us>
	<dc29b1131b84bef879cf68d1d1edae07f51ca3d2.camel@cybertec.at>
	<3227956.1626186568@sss.pgh.pa.us>
	<CAEudQAq22dUhHp9ryKNOnro0HkQWiJE1F3g3VxHUFsqQ4ZkyeA@mail.gmail.com>
	<3280448.1626200778@sss.pgh.pa.us>
	<06a9ff0f-d1e9-0340-2f3b-180cefe41c7a@enterprisedb.com>
	<3517180.1626280000@sss.pgh.pa.us>

I wrote:
> Interesting question, so I took a look:
> https://git.musl-libc.org/cgit/musl/tree/src/stdio/vfprintf.c#n593
>                     case 's':
> 			a = arg.p ? arg.p : "(null)";

BTW, the adjacent code shows that musl is also supporting glibc's
"%m" extension, so I imagine that they are endeavoring to be
compatible with glibc, and this goes along with that.  But that
just supports my larger point: printing "(null)" is clearly the
de facto standard now, whether or not POSIX has caught up with it.

			regards, tom lane





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