1#!/usr/bin/perl
2# Exercise od
3
4# Copyright (C) 2006-2023 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
19use strict;
20
21(my $program_name = $0) =~ s|.*/||;
22
23# Turn off localization of executable's output.
24@ENV{qw(LANGUAGE LANG LC_ALL)} = ('C') x 3;
25
26# Use a file in /proc whose size is not likely to
27# change between the wc and od invocations.
28my $proc_file = '/proc/version';
29-f $proc_file
30  or $proc_file = '/dev/null';
31
32# Count the bytes in $proc_file, _by reading_.
33my $len = 0;
34open FH, '<', $proc_file
35  or die "$program_name: can't open '$proc_file' for reading: $!\n";
36while (defined (my $line = <FH>))
37  {
38    $len += length $line;
39  }
40close FH;
41my $proc_file_byte_count = $len;
42
43my @Tests =
44    (
45     # Skip the exact length of the input file.
46     # Up to coreutils-6.9, this would ignore the "-j 1".
47     ['j-bug1', '-c -j 1 -An', {IN=>{g=>'a'}}, {OUT=>''}],
48     ['j-bug2', '-c -j 2 -An', {IN=>{g=>'a'}}, {IN=>{h=>'b'}}, {OUT=>''}],
49     # Skip the sum of the lengths of the first three inputs.
50     ['j-bug3', '-c -j 3 -An', {IN=>{g=>'a'}}, {IN=>{h=>'b'}},
51                                               {IN=>{i=>'c'}}, {OUT=>''}],
52     # Skip the sum of the lengths of the first three inputs, printing the 4th.
53     ['j-bug4', '-c -j 3 -An', {IN=>{g=>'a'}}, {IN=>{h=>'b'}},
54                               {IN=>{i=>'c'}}, {IN=>{j=>'d'}}, {OUT=>"   d\n"}],
55
56     # Ensure that od -j doesn't fseek across a nonempty file in /proc,
57     # even if the kernel reports that the file has stat.st_size = 0.
58     ['j-proc', "-An -c -j $proc_file_byte_count $proc_file",
59                               {IN=>{f2=>'e'}}, {OUT=>"   e\n"}],
60
61     # Ensure that a large width does not cause trouble.
62     # From coreutils-7.0 through coreutils-8.21, these would print
63     # approximately 128KiB of padding.
64     ['wide-a',   '-a -w65537 -An', {IN=>{g=>'x'}}, {OUT=>"   x\n"}],
65     ['wide-c',   '-c -w65537 -An', {IN=>{g=>'x'}}, {OUT=>"   x\n"}],
66     ['wide-x', '-tx1 -w65537 -An', {IN=>{g=>'B'}}, {OUT=>" 42\n"}],
67    );
68
69my $save_temps = $ENV{DEBUG};
70my $verbose = $ENV{VERBOSE};
71
72my $prog = 'od';
73my $fail = run_tests ($program_name, $prog, \@Tests, $save_temps, $verbose);
74exit $fail;
75