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Message-ID: <20170710205955.GN1627@brightrain.aerifal.cx> Date: Mon, 10 Jul 2017 16:59:55 -0400 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: [PATCH] handle whitespace before %% in scanf On Mon, Jul 10, 2017 at 04:44:45PM +0200, 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 So you can confirm that it's intentional that %% consume space? That seems utterly awful but I guess you can use %*1[%] in place of %% to do what %% should... Rich
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