1 files changed, 91 insertions, 0 deletions
diff --git a/tests/misc/tac.pl b/tests/misc/tac.pl
new file mode 100755
index 0000000..56fc208
--- /dev/null
+++ b/tests/misc/tac.pl
@@ -0,0 +1,91 @@
+#!/usr/bin/perl
+
+# Copyright (C) 2008-2020 Free Software Foundation, Inc.
+
+# This program 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.
+
+# This program 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 <https://www.gnu.org/licenses/>.
+
+use strict;
+
+my $prog = 'tac';
+
+# Turn off localization of executable's output.
+@ENV{qw(LANGUAGE LANG LC_ALL)} = ('C') x 3;
+
+my $bad_dir = 'no/such/dir';
+
+# This must be longer than 16KiB to trigger the double free in coreutils-8.5.
+my $long_line = 'o' x (16 * 1024 + 1);
+
+my @Tests =
+(
+  ['segfault', '-r', {IN=>"a\n"}, {IN=>"b\n"}, {OUT=>"a\nb\n"}],
+  ['segfault2','-r', {IN=>"a\nb\n"}, {IN=>"1\n2\n"}, {OUT=>"b\na\n2\n1\n"}],
+
+  ['basic-0', '', {IN=>""}, {OUT=>""}],
+  ['basic-a', '', {IN=>"a"}, {OUT=>"a"}],
+  ['basic-b', '', {IN=>"\n"}, {OUT=>"\n"}],
+  ['basic-c', '', {IN=>"a\n"}, {OUT=>"a\n"}],
+  ['basic-d', '', {IN=>"a\nb"}, {OUT=>"ba\n"}],
+  ['basic-e', '', {IN=>"a\nb\n"}, {OUT=>"b\na\n"}],
+  ['basic-f', '', {IN=>"1234567\n8\n"}, {OUT=>"8\n1234567\n"}],
+  ['basic-g', '', {IN=>"12345678\n9\n"}, {OUT=>"9\n12345678\n"}],
+  ['basic-h', '', {IN=>"123456\n8\n"}, {OUT=>"8\n123456\n"}],
+  ['basic-i', '', {IN=>"12345\n8\n"}, {OUT=>"8\n12345\n"}],
+  ['basic-j', '', {IN=>"1234\n8\n"}, {OUT=>"8\n1234\n"}],
+  ['basic-k', '', {IN=>"123\n8\n"}, {OUT=>"8\n123\n"}],
+
+  ['nul-0', '-s ""', {IN=>""}, {OUT=>""}],
+  ['nul-a', '-s ""', {IN=>"a"}, {OUT=>"a"}],
+  ['nul-b', '-s ""', {IN=>"\0"}, {OUT=>"\0"}],
+  ['nul-c', '-s ""', {IN=>"a\0"}, {OUT=>"a\0"}],
+  ['nul-d', '-s ""', {IN=>"a\0b"}, {OUT=>"ba\0"}],
+  ['nul-e', '-s ""', {IN=>"a\0b\0"}, {OUT=>"b\0a\0"}],
+
+  ['opt-b', '-b', {IN=>"\na\nb\nc"}, {OUT=>"\nc\nb\na"}],
+  ['opt-s', '-s:', {IN=>"a:b:c:"}, {OUT=>"c:b:a:"}],
+  ['opt-sb', qw(-s : -b), {IN=>":a:b:c"}, {OUT=>":c:b:a"}],
+  ['opt-r', qw(-r -s '\._+'),
+   {IN=>"1._2.__3.___4._"},
+   {OUT=>"4._3.___2.__1._"}],
+
+  ['opt-r2', qw(-r -s '\._+'),
+   {IN=>"a.___b.__1._2.__3.___4._"},
+   {OUT=>"4._3.___2.__1._b.__a.___"}],
+
+  # This gave incorrect output (.___4._2.__3._1) with tac-1.22.
+  ['opt-br', qw(-b -r -s '\._+'),
+   {IN=>"._1._2.__3.___4"}, {OUT=>".___4.__3._2._1"}],
+
+  ['opt-br2', qw(-b -r -s '\._+'),
+   {IN=>".__x.___y.____z._1._2.__3.___4"},
+   {OUT=>".___4.__3._2._1.____z.___y.__x"}],
+
+  ['pipe-bad-tmpdir',
+   {ENV => "TMPDIR=$bad_dir"},
+   {IN_PIPE => "a\n"},
+   {ERR_SUBST => "s,'$bad_dir': .*,...,"},
+   {ERR => "$prog: failed to create temporary file in ...\n"},
+   {EXIT => 1}],
+
+  # coreutils-8.5's tac would double-free its primary buffer.
+  ['double-free', {IN=>$long_line}, {OUT=>$long_line}],
+);
+
+@Tests = triple_test \@Tests;
+
+my $save_temps = $ENV{DEBUG};
+my $verbose = $ENV{VERBOSE};
+
+my $fail = run_tests ($prog, $prog, \@Tests, $save_temps, $verbose);
+exit $fail;