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Date: Tue, 5 Sep 2017 00:00:46 +0200
From: Bartosz Brachaczek <b.brachaczek@...il.com>
To: musl@...ts.openwall.com
Subject: Re: [PATCH] handle whitespace before %% in scanf
On 7/10/2017 4:44 PM, Jens Gustedt wrote:
> Hello Bartosz,
>
> On Mon, 10 Jul 2017 10:22:37 +0200 Bartosz Brachaczek
> <b.brachaczek@...il.com> wrote:
>
>>> EXAMPLE 5 The call:
>>>
>>> #include <stdio.h>
>>> /* ... */
>>> int n, i;
>>> n = sscanf("foo % bar 42", "foo%%bar%d", &i);
>>>
>>> will assign to 'n' the value 1 and to 'i' the value 42 because input
>>> white-space characters are skipped for both the '%' and 'd'
>>> conversion specifiers.
>>
>> Now, the code in the example is clearly broken, as either the format
>> string should be "foo%% bar%d" or the input string should be
>> "foo %bar 42", but the explanation does imply that '%%' consumes
>> whitespace.
>
> Yes, I have noted this as an editorial fix for C17
>
> Thanks for reporting
Nice, thanks. Looks this one has already been reported here:
http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2033.htm
I can't find what's the status of that document, though.
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