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#!/bin/sh
# -*- perl -*-
# Exercise head's --bytes=-N option.
: ${PERL=perl}
: ${srcdir=.}
$PERL -e 1 > /dev/null 2>&1 || {
echo 1>&2 "$0: configure didn't find a usable version of Perl," \
"so can't run this test"
exit 77
}
exec $PERL -w -I$srcdir/.. -MFetish -- - <<\EOF
#/
require 5.003;
use strict;
(my $program_name = $0) =~ s|.*/||;
$ENV{PROG} = 'head';
# Turn off localization of executable's ouput.
@ENV{qw(LANGUAGE LANG LC_ALL)} = ('C') x 3;
# This should match the definition in head.c.
my $READ_BUFSIZE = 4096;
my @Tests =
(
# Elide the exact size of the file.
['elide-1', "--bytes=-2", {IN=>"a\n"}, {OUT=>''}],
# Elide more than the size of the file.
['elide-2', "--bytes=-2", {IN=>"a"}, {OUT=>''}],
# Leave just one byte.
['elide-3', "--bytes=-2", {IN=>"abc"}, {OUT=>'a'}],
# Make it so the elided bytes straddle the end of the first
# $READ_BUFSIZE block.
['elide-4', "--bytes=-2",
{IN=> 'a' x ($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-5', "--bytes=-2",
{IN=> 'a' x (2 * $READ_BUFSIZE - 2) . 'bcd'},
{OUT=>'a' x (2 * $READ_BUFSIZE - 2) . 'b'}],
);
# Brute force: use all combinations of file sizes [0..20] and
# number of bytes to elide [0..20].
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 $t = ["elide-$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;
}
}
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;
EOF
|
