* [PATCH] ar: Correct -N COUNT off-by-one
@ 2022-08-28 15:57 Mark Wielaard
0 siblings, 0 replies; only message in thread
From: Mark Wielaard @ 2022-08-28 15:57 UTC (permalink / raw)
To: elfutils-devel; +Cc: Mark Wielaard, panxiaohe
When using instance [COUNT], the instance check is wrong.
instance-- == 0 should be --instance == 0.
Add a testcase run-ar-N.sh that uses -N COUNT with extract and delete
operations checking the right instance was extracted and deleted.
https://sourceware.org/bugzilla/show_bug.cgi?id=28725
Reported-by: panxiaohe <panxh_ran@163.com>
Signed-off-by: Mark Wielaard <mark@klomp.org>
---
src/ChangeLog | 6 +++++
src/ar.c | 4 +--
tests/ChangeLog | 6 +++++
tests/Makefile.am | 2 ++
tests/run-ar-N.sh | 65 +++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 81 insertions(+), 2 deletions(-)
create mode 100755 tests/run-ar-N.sh
diff --git a/src/ChangeLog b/src/ChangeLog
index 88db4051..9348c562 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,9 @@
+2022-08-28 Mark Wielaard <mark@klomp.org>
+
+ * ar.c (do_oper_extract): Predecrement instance before compare
+ to zero.
+ (do_oper_delete): Likewise.
+
2022-08-10 Andreas Schwab <schwab@suse.de>
* readelf.c (print_attributes): Also handle SHT_RISCV_ATTRIBUTES.
diff --git a/src/ar.c b/src/ar.c
index 9e8df120..04456c18 100644
--- a/src/ar.c
+++ b/src/ar.c
@@ -518,7 +518,7 @@ do_oper_extract (int oper, const char *arfname, char **argv, int argc,
ENTRY entry;
entry.key = arhdr->ar_name;
ENTRY *res = hsearch (entry, FIND);
- if (res != NULL && (instance < 0 || instance-- == 0)
+ if (res != NULL && (instance < 0 || --instance == 0)
&& !found[(char **) res->data - argv])
found[(char **) res->data - argv] = do_extract = true;
}
@@ -952,7 +952,7 @@ do_oper_delete (const char *arfname, char **argv, int argc,
ENTRY entry;
entry.key = arhdr->ar_name;
ENTRY *res = hsearch (entry, FIND);
- if (res != NULL && (instance < 0 || instance-- == 0)
+ if (res != NULL && (instance < 0 || --instance == 0)
&& !found[(char **) res->data - argv])
found[(char **) res->data - argv] = do_delete = true;
}
diff --git a/tests/ChangeLog b/tests/ChangeLog
index d2952cc9..48bb28d1 100644
--- a/tests/ChangeLog
+++ b/tests/ChangeLog
@@ -1,3 +1,9 @@
+2022-08-26 Mark Wielaard <mark@klomp.org>
+
+ * run-ar-N.sh: New test.
+ * Makefile.am (TESTS): Add run-ar-N.sh.
+ (EXTRA_DIST): Likewise.
+
2022-08-04 Sergei Trofimovich <slyich@gmail.com>
* low_high_pc.c (handle_die): Drop redundant 'lx' suffix.
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 87988fb9..85514898 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -100,6 +100,7 @@ test-nlist$(EXEEXT): test-nlist.c
$(test_nlist_CFLAGS) $(GCOV_FLAGS) -o $@ $< $(test_nlist_LDADD)
TESTS = run-arextract.sh run-arsymtest.sh run-ar.sh newfile test-nlist \
+ run-ar-N.sh \
update1 update2 update3 update4 \
run-show-die-info.sh run-get-files.sh run-get-lines.sh \
run-next-files.sh run-next-lines.sh \
@@ -254,6 +255,7 @@ endif
endif
EXTRA_DIST = run-arextract.sh run-arsymtest.sh run-ar.sh \
+ run-ar-N.sh \
run-show-die-info.sh run-get-files.sh run-get-lines.sh \
run-next-files.sh run-next-lines.sh testfile-only-debug-line.bz2 \
run-get-pubnames.sh run-get-aranges.sh \
diff --git a/tests/run-ar-N.sh b/tests/run-ar-N.sh
new file mode 100755
index 00000000..de8f62b3
--- /dev/null
+++ b/tests/run-ar-N.sh
@@ -0,0 +1,65 @@
+#! /usr/bin/env bash
+# Copyright (C) 2022 Mark J. Wielaard <mark@klomp.org>
+# This file is part of elfutils.
+#
+# This file is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# elfutils is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+. $srcdir/test-subr.sh
+
+tempfiles testfile test.ar
+
+echo create test.ar with 3 testfile
+echo 1 > testfile
+testrun ${abs_top_builddir}/src/ar -vr test.ar testfile
+echo 2 > testfile
+testrun ${abs_top_builddir}/src/ar -vq test.ar testfile
+testrun ${abs_top_builddir}/src/ar -t test.ar
+echo 3 > testfile
+testrun ${abs_top_builddir}/src/ar -vq test.ar testfile
+testrun_compare ${abs_top_builddir}/src/ar -t test.ar << EOF
+testfile
+testfile
+testfile
+EOF
+
+echo list content of testfile 1 2 3
+testrun ${abs_top_builddir}/src/ar -vx -N 1 test.ar testfile
+diff -u testfile - << EOF
+1
+EOF
+testrun ${abs_top_builddir}/src/ar -vx -N 2 test.ar testfile
+diff -u testfile - << EOF
+2
+EOF
+testrun ${abs_top_builddir}/src/ar -vx -N 3 test.ar testfile
+diff -u testfile - << EOF
+3
+EOF
+
+echo delete testfile 2
+testrun ${abs_top_builddir}/src/ar -vd -N 2 test.ar testfile
+testrun_compare ${abs_top_builddir}/src/ar -t test.ar << EOF
+testfile
+testfile
+EOF
+testrun ${abs_top_builddir}/src/ar -vx -N 1 test.ar testfile
+diff -u testfile - << EOF
+1
+EOF
+testrun ${abs_top_builddir}/src/ar -vx -N 2 test.ar testfile
+diff -u testfile - << EOF
+3
+EOF
+
+exit 0
--
2.30.2
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