From: "Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
To: git@vger.kernel.org
Cc: "Junio C Hamano" <gitster@pobox.com>, "Jeff King" <peff@peff.net>,
"Jeffrey Walton" <noloader@gmail.com>,
"Michał Kiedrowicz" <michal.kiedrowicz@gmail.com>,
"J Smith" <dark.panda@gmail.com>,
"Victor Leschuk" <vleschuk@gmail.com>,
"Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>,
"Fredrik Kuivinen" <frekui@gmail.com>,
"Brandon Williams" <bmwill@google.com>,
"Ævar Arnfjörð Bjarmason" <avarab@gmail.com>
Subject: [PATCH 21/29] grep: factor test for \0 in grep patterns into a function
Date: Thu, 11 May 2017 09:18:21 +0000 [thread overview]
Message-ID: <20170511091829.5634-22-avarab@gmail.com> (raw)
In-Reply-To: <20170511091829.5634-1-avarab@gmail.com>
Factor the test for \0 in grep patterns into a function. Since commit
9eceddeec6 ("Use kwset in grep", 2011-08-21) any pattern containing a
\0 is considered fixed as regcomp() can't handle it.
This limitation was never documented, and other some regular
expression engines are capable of compiling a pattern containing a
\0. Factoring this out makes a subsequent change which does that
smaller.
See a previous commit in this series ("grep: add tests to fix blind
spots with \0 patterns", 2017-04-21) for further details & rationale.
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
grep.c | 19 ++++++++++++-------
1 file changed, 12 insertions(+), 7 deletions(-)
diff --git a/grep.c b/grep.c
index bf6c2494fd..27de615209 100644
--- a/grep.c
+++ b/grep.c
@@ -394,12 +394,6 @@ static int is_fixed(const char *s, size_t len)
{
size_t i;
- /* regcomp cannot accept patterns with NULs so we
- * consider any pattern containing a NUL fixed.
- */
- if (memchr(s, 0, len))
- return 1;
-
for (i = 0; i < len; i++) {
if (is_regex_special(s[i]))
return 0;
@@ -408,6 +402,17 @@ static int is_fixed(const char *s, size_t len)
return 1;
}
+static int has_null(const char *s, size_t len)
+{
+ /* regcomp cannot accept patterns with NULs so when using it
+ * we consider any pattern containing a NUL fixed.
+ */
+ if (memchr(s, 0, len))
+ return 1;
+
+ return 0;
+}
+
static void compile_fixed_regexp(struct grep_pat *p, struct grep_opt *opt)
{
struct strbuf sb = STRBUF_INIT;
@@ -451,7 +456,7 @@ static void compile_regexp(struct grep_pat *p, struct grep_opt *opt)
* simple string match using kws. p->fixed tells us if we
* want to use kws.
*/
- if (opt->fixed || is_fixed(p->pattern, p->patternlen))
+ if (opt->fixed || has_null(p->pattern, p->patternlen) || is_fixed(p->pattern, p->patternlen))
p->fixed = !icase || ascii_only;
else
p->fixed = 0;
--
2.11.0
next prev parent reply other threads:[~2017-05-11 9:19 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-11 9:18 [PATCH 00/29] Easy to review grep & pre-PCRE changes Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 01/29] Makefile & configure: reword inaccurate comment about PCRE Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 02/29] grep & rev-list doc: stop promising libpcre for --perl-regexp Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 03/29] test-lib: rename the LIBPCRE prerequisite to PCRE Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 04/29] log: add exhaustive tests for pattern style options & config Ævar Arnfjörð Bjarmason
2017-05-12 4:48 ` Junio C Hamano
2017-05-13 18:02 ` Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 05/29] grep: add a test asserting that --perl-regexp dies when !PCRE Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 06/29] grep: add a test for backreferences in PCRE patterns Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 07/29] grep: change non-ASCII -i test to stop using --debug Ævar Arnfjörð Bjarmason
2017-05-11 18:31 ` Brandon Williams
2017-05-11 18:35 ` Ævar Arnfjörð Bjarmason
2017-05-11 20:05 ` Brandon Williams
2017-05-11 9:18 ` [PATCH 08/29] grep: add tests for --threads=N and grep.threads Ævar Arnfjörð Bjarmason
2017-05-11 18:36 ` Brandon Williams
2017-05-11 19:22 ` Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 09/29] grep: amend submodule recursion test for regex engine testing Ævar Arnfjörð Bjarmason
2017-05-12 4:59 ` Junio C Hamano
2017-05-13 17:33 ` Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 10/29] grep: add tests for grep pattern types being passed to submodules Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 11/29] grep: add a test helper function for less verbose -f \0 tests Ævar Arnfjörð Bjarmason
2017-05-12 5:06 ` Junio C Hamano
2017-05-13 11:33 ` Ævar Arnfjörð Bjarmason
2017-05-15 1:29 ` Junio C Hamano
2017-05-11 9:18 ` [PATCH 12/29] grep: prepare for testing binary regexes containing rx metacharacters Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 13/29] grep: add tests to fix blind spots with \0 patterns Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 14/29] perf: add a GIT_PERF_MAKE_COMMAND for when *_MAKE_OPTS won't do Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 15/29] perf: emit progress output when unpacking & building Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 16/29] perf: add a performance comparison test of grep -G, -E and -P Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 17/29] perf: add a performance comparison of fixed-string grep Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 18/29] grep: catch a missing enum in switch statement Ævar Arnfjörð Bjarmason
2017-05-11 20:08 ` Brandon Williams
2017-05-11 20:40 ` Stefan Beller
2017-05-11 20:50 ` Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 19/29] grep: remove redundant regflags assignment under PCRE Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 20/29] grep: remove redundant `regflags &= ~REG_EXTENDED` assignments Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` Ævar Arnfjörð Bjarmason [this message]
2017-05-11 20:15 ` [PATCH 21/29] grep: factor test for \0 in grep patterns into a function Brandon Williams
2017-05-11 20:22 ` Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 22/29] grep: change the internal PCRE macro names to be PCRE1 Ævar Arnfjörð Bjarmason
2017-05-11 20:10 ` Brandon Williams
2017-05-11 9:18 ` [PATCH 23/29] grep: change internal *pcre* variable & function names to be *pcre1* Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 24/29] grep: move two functions to avoid forward declaration Ævar Arnfjörð Bjarmason
2017-05-11 20:14 ` Brandon Williams
2017-05-11 20:20 ` Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 25/29] test-lib: add a PTHREADS prerequisite Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 26/29] pack-objects & index-pack: add test for --threads warning Ævar Arnfjörð Bjarmason
2017-05-11 20:17 ` Brandon Williams
2017-05-11 20:34 ` Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 27/29] pack-objects: fix buggy warning about threads Ævar Arnfjörð Bjarmason
2017-05-11 9:18 ` [PATCH 28/29] grep: given --threads with NO_PTHREADS=YesPlease, warn Ævar Arnfjörð Bjarmason
2017-05-11 20:21 ` Brandon Williams
2017-05-11 20:33 ` Ævar Arnfjörð Bjarmason
2017-05-11 20:43 ` Brandon Williams
2017-05-11 21:20 ` [PATCH] C style: use standard style for "TRANSLATORS" comments Ævar Arnfjörð Bjarmason
2017-05-11 21:41 ` Jonathan Nieder
2017-05-11 21:50 ` Brandon Williams
2017-05-12 5:20 ` Johannes Sixt
2017-05-30 16:02 ` Jiang Xin
2017-05-30 23:03 ` Junio C Hamano
2017-05-11 9:18 ` [PATCH 29/29] grep: assert that threading is enabled when calling grep_{lock,unlock} Ævar Arnfjörð Bjarmason
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