Message-ID: <1498411624.24295.36.camel@perches.com>
Subject: Re: [PATCH] lib: vsprintf: add printf format conversion %M for
 errno strings
From: Joe Perches <joe@perches.com>
To: "Enrico Weigelt, metux IT consult" <enrico.weigelt@gr13.net>,
        linux-kernel@vger.kernel.org
Date: Sun, 25 Jun 2017 10:27:04 -0700
In-Reply-To: <20170625171230.7613-1-enrico.weigelt@gr13.net>
References: <20170625171230.7613-1-enrico.weigelt@gr13.net>
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On Sun, 2017-06-25 at 19:12 +0200, Enrico Weigelt, metux IT consult
wrote:
> Adding a new format conversion for *printf() and friends.

Every use of %M is going to cause gcc when using __printf to emit
a warning like:

unknown conversion type character ‘M’ in format [-Wformat=]

Beyond that, why is this useful?
There can't possibly be any fast-path use.
Why not just create a function that does errno/string conversions?