On Mon, 05 Jun 2006, Eric Sesterhenn wrote:
> > Problem is, the strings are (possibly) still not zero-terminated:
> > strncpy() only appends zeroes if src contents are short enough; if they
> > are not, dest is only zero-terminated if dest[sizeof(dest)-1] was zero
> > before.
> > strlcpy() semantics promise more sanity; dest is always zero-terminated
> > (if its size is >= 1), and the size parameter holds total dest size.
> > (See lib/string.c for more details.)
>
> In all cases there is a memset() which sets the entire structure to
> zero. Since we never write to the last byte with the strncpy() it will
> be null terminated. But if you think strlcpy() is safer for the future,
> i can make you a third patch.
I did not dig in the surrounding code that deeply, no doubt you're right
about the zero termination issue.
I just _personally_ think strlcpy(dest, src, sizeof(*dest)); looks
more sane than strncpy(dest, src, sizeof(*dest)-1);, and it additionally
does not rely on dest being zero-terminated beforehand.
Kind regards,
Horst
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