1#!/bin/sh
2# ensure that tac works with non-seekable or quasi-seekable inputs
3
4# Copyright (C) 2011-2023 Free Software Foundation, Inc.
5
6# This program is free software: you can redistribute it and/or modify
7# it under the terms of the GNU General Public License as published by
8# the Free Software Foundation, either version 3 of the License, or
9# (at your option) any later version.
10
11# This program is distributed in the hope that it will be useful,
12# but WITHOUT ANY WARRANTY; without even the implied warranty of
13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14# GNU General Public License for more details.
15
16# You should have received a copy of the GNU General Public License
17# along with this program.  If not, see <https://www.gnu.org/licenses/>.
18
19. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
20print_ver_ tac
21
22echo x | tac - - > out 2> err || fail=1
23echo x > exp || framework_failure_
24compare exp out || fail=1
25compare /dev/null err || fail=1
26
27# Make sure it works on funny files in /proc and /sys.
28
29for file in /proc/version /sys/kernel/profiling; do
30  if test -r $file; then
31    cp -f $file copy &&
32    tac copy > exp1 || framework_failure_
33
34    tac $file > out1 || fail=1
35    compare exp1 out1 || fail=1
36  fi
37done
38
39# Assume timeout is due to failure to close stdin with <&-
40# which was seen on NetBSD 7.1 / x86_64
41returns_ 124 timeout 10 tac - - <&- 2>err && skip_ 'error closing stdin'
42# This failed due to heap corruption from v8.15-v8.25 inclusive.
43returns_ 1 timeout 10 tac - - <&- 2>err || fail=1
44
45Exit $fail
46