On Mon, 6 Aug 2012, Pavel Vasilyev wrote:
> 06.08.2012 18:36, Alan Stern пишет:
> > On Mon, 6 Aug 2012, Pavel Machek wrote:
> >
> >> On Thu 2012-07-26 21:39:38, Len Brown wrote:
> >>> ...both give the number of chars in the string
> >>> without the '\0', as strncmp() wants,
> >>> but sizeof() is compile-time.
> >>
> >> What about introducing something like streq() to do this
> >> automatically? This is ugly....
> >>
> >> #define streq(a, b) ... if (_buildin_constant(b)) ...
> >>
> >> ?
> >>
> >>> - if (!strncmp(val, "enable", strlen("enable"))) {
> >>> + if (!strncmp(val, "enable", sizeof("enable") - 1)) {
> >
> > While you're at it, there's no point using strncmp when you know the
> > length of one of the strings beforehand. Just use memcmp, and don't
> > subtract 1 from the sizeof value.
>
> http://www.gossamer-threads.com/lists/engine?do=post_attachment;postatt_id=41157;list=linux
Interestingly, many (all?) of the changes in that patch are wrong
because they don't try to match the terminating '\0'. As a result,
they will match against extensions of the target string as well as the
target string itself.
Alan Stern
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