From: Junio C Hamano <gitster@pobox.com>
Date: Tue, 30 Oct 2007 00:00:42 GMT
Subject: Re: [PATCH] Speedup scanning for excluded files.
Message-ID: <7vzly1sc7p.fsf@gitster.siamese.dyndns.org>
In-Reply-To: <118833cc0710291559kbd874a8o8111b9495090ef27@mail.gmail.com>

"Morten Welinder" <mwelinder@gmail.com> writes:

>> +                               } else if (x->flags & EXC_FLAG_ENDSWITH) {
>> +                                       if (!strcmp(exclude + 1, pathname + pathlen -x->patternlen + 1))
>
> Is there some guarantee that the result of that subtraction is still within
> the string?

Good eyes.

If pattern is "*.exe", patternlen is 5, and strcmp wants to
compare 4 chars, so pathlen is better be at least that long, and
we do allow that pattern to match a hidden file ".exe".

Like this?

	if (x->patternlen - 1 <= pathlen &&
        	!strcmp(exclude + 1, pathname + pathlen - x->patternlen + 1))
		return to_exclude;