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pickaxe -S: support content with NULs under --pickaxe-regex

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Fix a bug in the matching routine powering -S<rx> --pickaxe-regex so
that we won't abort early on content that has NULs in it.

We've had a hard requirement on REG_STARTEND since 2f8952250a8 (regex:
add regexec_buf() that can work on a non NUL-terminated string,
2016-09-21), but this sanity check dates back to d01d8c67828 (Support
for pickaxe matching regular expressions, 2006-03-29).

It wasn't needed anymore, and as the now-passing test shows, actively
getting in our way. Since we always require REG_STARTEND support we do
not need to stop at NULs. If we are dealing with a haystack with NUL
in it. The needle may be behind that NUL.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ævar Arnfjörð Bjarmason 2021-04-12 19:15:21 +02:00 committed by Junio C Hamano
parent 2e197a7592
commit 52e011cd2b
2 changed files with 10 additions and 2 deletions
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4
diffcore-pickaxe.c
View File

@ -78,12 +78,12 @@ static unsigned int contains(mmfile_t *mf, regex_t *regexp, kwset_t kws)
regmatch_t regmatch;
int flags = 0;
while (sz && *data &&
while (sz &&
!regexec_buf(regexp, data, sz, 1, &regmatch, flags)) {
flags |= REG_NOTBOL;
data += regmatch.rm_eo;
sz -= regmatch.rm_eo;
if (sz && *data && regmatch.rm_so == regmatch.rm_eo) {
if (sz && regmatch.rm_so == regmatch.rm_eo) {
data++;
sz--;
}

8
t/t4209-log-pickaxe.sh
View File

@ -215,4 +215,12 @@ test_expect_success 'log -S looks into binary files' '
test_cmp log full-log
'
test_expect_success 'log -S --pickaxe-regex looks into binary files' '
git -C GS-bin-txt log --pickaxe-regex -Sa >log &&
test_cmp log full-log &&
git -C GS-bin-txt log --pickaxe-regex -S"[a]" >log &&
test_cmp log full-log
'
test_done