On 12/1/22 17:21, Thorsten Glaser wrote:
Please fix this bug, it’s really bad and embarrassing.
Thanks for reporting it; I wasn't aware of it.
Although you sent your email to 36...@debbugs.gnu.org /
930247@bugs.debian.9org, your email is reporting a separate bug, and I
fixed it in the development version of GNU grep by installing the
attached patch. This patch should appear in the next GNU grep release.
I suggest not closing the original bug reports, since the original bug
remains. Of course fixes are welcome but they are lower priority.From b061d24916fb9a14da37a3f2a05cb80dc65cfd38 Mon Sep 17 00:00:00 2001
From: Paul Eggert <egg...@cs.ucla.edu>
Date: Mon, 5 Dec 2022 14:16:45 -0800
Subject: [PATCH] grep: bug: backref in last of multiple patterns
* NEWS: Mention this.
* src/dfasearch.c (GEAcompile): Trim trailing newline from
the last pattern, even if it has back-references and follows
a pattern that lacks back-references.
* tests/backref: Add test for this bug.
---
NEWS | 6 ++++++
src/dfasearch.c | 25 ++++++++++++-------------
tests/backref | 8 ++++++++
3 files changed, 26 insertions(+), 13 deletions(-)
diff --git a/NEWS b/NEWS
index da293a3..6c00b2b 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,12 @@ GNU grep NEWS -*- outline -*-
* Noteworthy changes in release ?.? (????-??-??) [?]
+** Bug fixes
+
+ When given multiple patterns the last of which has a back-reference,
+ grep no longer sometimes mistakenly matches lines in some cases.
+ [Bug#36148#13 introduced in grep 3.4]
+
* Noteworthy changes in release 3.8 (2022-09-02) [stable]
diff --git a/src/dfasearch.c b/src/dfasearch.c
index a71902a..a5b0d90 100644
--- a/src/dfasearch.c
+++ b/src/dfasearch.c
@@ -281,20 +281,19 @@ GEAcompile (char *pattern, idx_t size, reg_syntax_t syntax_bits,
if (compilation_failed)
exit (EXIT_TROUBLE);
- if (prev <= patlim)
+ if (patlim < prev)
+ buflen--;
+ else if (pattern < prev)
{
- if (pattern < prev)
- {
- idx_t prevlen = patlim - prev;
- buf = xirealloc (buf, buflen + prevlen);
- memcpy (buf + buflen, prev, prevlen);
- buflen += prevlen;
- }
- else
- {
- buf = pattern;
- buflen = size;
- }
+ idx_t prevlen = patlim - prev;
+ buf = xirealloc (buf, buflen + prevlen);
+ memcpy (buf + buflen, prev, prevlen);
+ buflen += prevlen;
+ }
+ else
+ {
+ buf = pattern;
+ buflen = size;
}
/* In the match_words and match_lines cases, we use a different pattern
diff --git a/tests/backref b/tests/backref
index 510e130..97cb157 100755
--- a/tests/backref
+++ b/tests/backref
@@ -43,4 +43,12 @@ if test $? -ne 2 ; then
failures=1
fi
+# https://bugs.gnu.org/36148#13
+echo 'Total failed: 2 (1 ignored)' |
+ grep -e '^Total failed: 0$' -e '^Total failed: \([0-9]*\) (\1 ignored)$'
+if test $? -ne 1 ; then
+ echo "Backref: Multiple -e test, test #5 failed"
+ failures=1
+fi
+
Exit $failures
--
2.38.1
