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SubjectRe: gcc fixed size char array initialization bug - known?


On Thu, 2 Aug 2007, Jan Engelhardt wrote:

> On Aug 2 2007 21:55, Guennadi Liakhovetski wrote:
> > [...]
> >
> > 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.

<nitpicking>

While we're talking of null-termination of strings, then I bet you
generally want to be using strlcpy(), really. Often strncpy() isn't
what you want. Of course, if that buffer isn't a string at all, then
you should be using memfoo() functions and not strbar() ones in the
first place ...
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