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#!./perl
BEGIN {
chdir 't' if -d 't';
@INC = '../lib';
require "./test.pl";
}
use warnings;
use strict;
use Errno;
{ # Test we can seekdir to all positions.
my $dh;
ok(opendir($dh, ".") == 1, "able to opendir('.')");
# Build up a list of all the files and their positions.
my @p_f; # ([POS_0, FILE_0], [POS_1, FILE_1], ...)
while (1) {
my $p = telldir $dh;
my $f = readdir $dh;
last unless defined $f;
push @p_f, [$p, $f];
}
# Test we can seekdir() to the given position and that
# readdir() returns the expected file name.
my $test = sub {
my ($p_f, $type) = @_;
my ($p, $f) = @$p_f;
ok(seekdir($dh, $p), "$type seekdir($p)");
ok(readdir($dh) eq $f, "$type readdir() -> $f \tas expected");
};
# Go forwards.
$test->($_, "forward") for @p_f;
# Go backwards.
$test->($_, "backward") for reverse @p_f;
# A mixed traversal: longest file names first.
my @sorted_p_f = sort {
length $b->[1] <=> length $a->[1]
or
$a->[1] cmp $b->[1]
} @p_f;
$test->($_, "mixed") for @sorted_p_f;
# Test behaviour of seekdir(-1).
ok(seekdir($dh, -1), "seekdir(-1) returns true...");
ok(!defined readdir($dh), "...but next readdir() gives undef");
# Test behaviour of seekdir() to a position beyond what we
# have read so far.
my $final_p_f = $p_f[-1];
my $end_pos = $final_p_f->[0] + length $final_p_f->[1];
ok(seekdir($dh, $end_pos), "seekdir($end_pos) possible");
ok(telldir($dh) == $end_pos, "telldir() equal to where we seekdir()d");
# At this point we readdir() the trailing NUL of the last file name.
ok(readdir($dh) eq '', "readdir() here gives an empty string");
# Reached the end of files to seekdir() to.
ok(telldir($dh) == -1, "telldir() now equal to -1");
ok(!defined readdir($dh), "next readdir() gives undef");
# NB. `seekdir(DH, POS)` always returns true regardless of the
# value of POS, providing DH is a valid directory handle.
# However, if POS _is_ out of range then `telldir(DH)` is -1,
# and `readdir(DH)` returns undef.
ok(seekdir($dh, $end_pos + 1), "seekdir($end_pos + 1) returns true...");
ok(telldir($dh) == -1, "....but telldir() == -1 indicating out of range");
ok(!defined readdir($dh), "... and next readdir() gives undef");
ok(closedir($dh) == 1, "Finally. closedir() returns true");
}
done_testing();
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