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#!/usr/bin/perl
# Exercise head's --bytes=-N option.
# Copyright (C) 2003-2018 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 $program_name = $0) =~ s|.*/||;
$ENV{PROG} = 'head';
# Turn off localization of executable's output.
@ENV{qw(LANGUAGE LANG LC_ALL)} = ('C') x 3;
# This should match the definition in head.c.
my $READ_BUFSIZE = 8192;
my @Tests =
(
# Elide the exact size of the file.
['elide-b1', "--bytes=-2", {IN=>"a\n"}, {OUT=>''}],
# Elide more than the size of the file.
['elide-b2', "--bytes=-2", {IN=>"a"}, {OUT=>''}],
# Leave just one byte.
['elide-b3', "--bytes=-2", {IN=>"abc"}, {OUT=>'a'}],
# Make it so the elided bytes straddle the end of the first
# $READ_BUFSIZE block.
['elide-b4', "--bytes=-2",
{IN=> 'a' x ($READ_BUFSIZE-3) . "\nbcd"},
{OUT=>'a' x ($READ_BUFSIZE-3) . "\nb"}],
# Make it so the elided bytes straddle the end of the 2nd
# $READ_BUFSIZE block.
['elide-b5', "--bytes=-2",
{IN=> 'a' x (2 * $READ_BUFSIZE - 2) . 'bcd'},
{OUT=>'a' x (2 * $READ_BUFSIZE - 2) . 'b'}],
['elide-l0', "--lines=-1", {IN=>''}, {OUT=>''}],
['elide-l1', "--lines=-1", {IN=>"a\n"}, {OUT=>''}],
['elide-l2', "--lines=-1", {IN=>"a"}, {OUT=>''}],
['elide-l3', "--lines=-1", {IN=>"a\nb"}, {OUT=>"a\n"}],
['elide-l4', "--lines=-1", {IN=>"a\nb\n"}, {OUT=>"a\n"}],
['elide-l5', "--lines=-0", {IN=>"a\nb\n"}, {OUT=>"a\nb\n"}],
['elide-l6', "--lines=-0", {IN=>"a\nb"}, {OUT=>"a\nb"}],
);
if ($ENV{RUN_EXPENSIVE_TESTS})
{
# Brute force: use all combinations of file sizes [0..20] and
# number of bytes to elide [0..20]. For better coverage, recompile
# head with -DHEAD_TAIL_PIPE_READ_BUFSIZE=4 and
# -DHEAD_TAIL_PIPE_BYTECOUNT_THRESHOLD=8
my $s = "abcdefghijklmnopqrst";
for my $file_size (0..20)
{
for my $n_elide (0..20)
{
my $input = substr $s, 0, $file_size;
my $out_len = $n_elide < $file_size ? $file_size - $n_elide : 0;
my $output = substr $input, 0, $out_len;
my $t = ["elideb$file_size-$n_elide", "--bytes=-$n_elide",
{IN=>$input}, {OUT=>$output}];
push @Tests, $t;
my @u = @$t;
# Insert the ---presume-input-pipe option.
$u[0] .= 'p';
$u[1] .= ' ---presume-input-pipe';
push @Tests, \@u;
}
}
$s =~ s/(.)/$1\n/g;
$s .= 'u'; # test without trailing '\n'
for my $file_size (0..21)
{
for my $n_elide (0..21)
{
my $input = substr $s, 0, 2 * $file_size;
my $out_len = $n_elide < $file_size ? $file_size - $n_elide : 0;
my $output = substr $input, 0, 2 * $out_len;
my $t = ["elidel$file_size-$n_elide", "--lines=-$n_elide",
{IN=>$input}, {OUT=>$output}];
push @Tests, $t;
my @u = @$t;
# Insert the ---presume-input-pipe option.
$u[0] .= 'p';
$u[1] .= ' ---presume-input-pipe';
push @Tests, \@u;
}
}
}
my $save_temps = $ENV{DEBUG};
my $verbose = $ENV{VERBOSE};
my $prog = $ENV{PROG} || die "$0: \$PROG not specified in environment\n";
my $fail = run_tests ($program_name, $prog, \@Tests, $save_temps, $verbose);
exit $fail;
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