On 02/08/07, Jan Engelhardt <[email protected]> wrote:
>
> On Aug 2 2007 21:55, Guennadi Liakhovetski wrote:
> >Hi
> >
> >I've run across the following gcc "feature":
> >
> > char c[4] = "01234";
> >
> >gcc emits a nice warning
> >
> >warning: initializer-string for array of chars is too long
> >
> >But do a
> >
> > char c[4] = "0123";
> >
> >and - a wonder - no warning. No warning with gcc 3.3.2, 3.3.5, 3.4.5,
> >4.1.2. I was told 4.2.x does produce a warning. Now do a
> >
> > struct {
> > char c[4];
> > int i;
> > } t;
> > t.i = 0x12345678;
> > strcpy(t.c, c);
> >
> >and t.i is silently corrupted. Just wanted to ask if this is known,
> >really...
>
> What does this have to do with the kernel? The string "0123" is
> generally _five_ characters long, so c[4] is not enough.
> Or use strncpy.
>
I believe Guennadi's point is that gcc does not warn about it in the
case of c[4] = "0123"; but only in the case of c[4] = "01234" - so if
we do have such initializations in the kernel we may have some bugs
hiding there that gcc doesn't warn us about.
--
Jesper Juhl <[email protected]>
Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html
Plain text mails only, please http://www.expita.com/nomime.html
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