Date: Fri, 16 Aug 2002 16:29:31 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: nate@root.org Cc: brooks@one-eyed-alien.net, arch@FreeBSD.ORG Subject: Re: kernel strlcpy Message-ID: <20020816.162931.25827842.imp@bsdimp.com> In-Reply-To: <Pine.BSF.4.21.0208161522100.43853-100000@root.org> References: <20020816.141548.17599527.imp@bsdimp.com> <Pine.BSF.4.21.0208161522100.43853-100000@root.org>
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In message: <Pine.BSF.4.21.0208161522100.43853-100000@root.org>
Nate Lawson <nate@root.org> writes:
: On Fri, 16 Aug 2002, M. Warner Losh wrote:
: > : I am not advocating introducing strlcat because strncat is bairly used
: > : (only 9 times in the whole kernel.)
: >
: > I think it would be reasonable.
: >
: > In fact, if we ELIMINATE strncat and strncpy in the kernel, then that
: > would be enough to justify bringing them in. Since this isn't a
: > hosted environment, we can do that if we want.
: >
: > Warner
:
: One useful thing about strncpy is that it overwrites the remainder of its
: length with zeroes, not just null-terminating the string with a single
: zero. This is useful for fixed-length fields that aren't interpreted as
: null-terminated strings but can be a huge performance hit when all you
: wanted was single null termination (i.e. path).
Right, but strn* is almost always used wrong. There are very few
fixed length fields like this compared to the number of bogus useages
of strn*.
Warner
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