#!./perl

print $^STDOUT, "1..28\n";

my $Is_Dosish = ($^OS_NAME eq 'MSWin32' or $^OS_NAME eq 'NetWare' or $^OS_NAME eq 'dos' or
              $^OS_NAME eq 'os2' or $^OS_NAME eq 'mint' or $^OS_NAME eq 'cygwin' or
              $^OS_NAME =~ m/^uwin/);

open(my $TST, "<", 'TEST') || (die "Can't open TEST");
binmode $TST if $Is_Dosish;
if (eof($TST)) { print $^STDOUT, "not ok 1\n"; } else { print $^STDOUT, "ok 1\n"; }

my $firstline = ~< $TST;
my $secondpos = tell $TST;

my $x = 0;
while ( ~< $TST) {
    if (eof $TST) {$x++;}
}
if ($x == 1) { print $^STDOUT, "ok 2\n"; } else { print $^STDOUT, "not ok 2\n"; }

my $lastpos = tell $TST;

unless (eof $TST) { print $^STDOUT, "not ok 3\n"; } else { print $^STDOUT, "ok 3\n"; }

if (seek($TST,0,0)) { print $^STDOUT, "ok 4\n"; } else { print $^STDOUT, "not ok 4\n"; }

if (eof $TST) { print $^STDOUT, "not ok 5\n"; } else { print $^STDOUT, "ok 5\n"; }

if ($firstline eq ~< $TST) { print $^STDOUT, "ok 6\n"; } else { print $^STDOUT, "not ok 6\n"; }

if ($secondpos == tell $TST) { print $^STDOUT, "ok 7\n"; } else { print $^STDOUT, "not ok 7\n"; }

if (seek($TST,0,1)) { print $^STDOUT, "ok 8\n"; } else { print $^STDOUT, "not ok 8\n"; }

if (eof($TST)) { print $^STDOUT, "not ok 9\n"; } else { print $^STDOUT, "ok 9\n"; }

if ($secondpos == tell $TST) { print $^STDOUT, "ok 10\n"; } else { print $^STDOUT, "not ok 10\n"; }

if (seek($TST,0,2)) { print $^STDOUT, "ok 11\n"; } else { print $^STDOUT, "not ok 11\n"; }

if ($lastpos == tell $TST) { print $^STDOUT, "ok 12\n"; } else { print $^STDOUT, "not ok 12\n"; }

unless (eof $TST) { print $^STDOUT, "not ok 13\n"; } else { print $^STDOUT, "ok 13\n"; }

print $^STDOUT, "ok 14\n";

open(my $other, "<", 'TEST') || (die "Can't open TEST: $^OS_ERROR");
binmode $other if (($^OS_NAME eq 'MSWin32') || ($^OS_NAME eq 'NetWare'));

close($other);
do {
    no warnings 'closed';
    if (tell($other) == -1)  { print $^STDOUT, "ok 15\n"; } else { print $^STDOUT, "not ok 15\n"; }
};
do {
    no warnings 'unopened';
    if (tell(\*ETHER) == -1)  { print $^STDOUT, "ok 16\n"; } else { print $^STDOUT, "not ok 16\n"; }
};

print $^STDOUT, "ok $_\n" for 17..23;

# ftell(STDIN) (or any std streams) is undefined, it can return -1 or
# something else.  ftell() on pipes, fifos, and sockets is defined to
# return -1.

my $written = "tell_write.txt";

END { 1 while unlink($written) }

close($TST);
open(my $tst, ">","$written")  || die "Cannot open $written:$^OS_ERROR";
binmode $tst if $Is_Dosish;

if (tell($tst) == 0) { print $^STDOUT, "ok 24\n"; } else { print $^STDOUT, "not ok 24\n"; }

print $tst, "fred\n";

if (tell($tst) == 5) { print $^STDOUT, "ok 25\n"; } else { print $^STDOUT, "not ok 25\n"; }

print $tst, "more\n";

if (tell($tst) == 10) { print $^STDOUT, "ok 26\n"; } else { print $^STDOUT, "not ok 26\n"; }

close($tst);

open($tst, "+>>", "$written")  || die "Cannot open $written:$^OS_ERROR";
binmode $tst if $Is_Dosish;

if (0) 
{
 # :stdio does not pass these so ignore them for now 

if (tell($tst) == 0) { print $^STDOUT, "ok 27\n"; } else { print $^STDOUT, "not ok 27\n"; }

my $line = ~< $tst;

if ($line eq "fred\n") { print $^STDOUT, "ok 29\n"; } else { print $^STDOUT, "not ok 29\n"; }

if (tell($tst) == 5) { print $^STDOUT, "ok 30\n"; } else { print $^STDOUT, "not ok 30\n"; }

}

print $tst, "xxxx\n";

if (tell($tst) == 15 ||
    tell($tst) == 5) # unset PERLIO or PERLIO=stdio (e.g. HP-UX, Solaris)
{ print $^STDOUT, "ok 27\n"; } else { print $^STDOUT, "not ok 27\n"; }

close($tst);

open($tst, ">","$written")  || die "Cannot open $written:$^OS_ERROR";
print $tst, "foobar";
close $tst;
open($tst, ">>","$written")  || die "Cannot open $written:$^OS_ERROR";

# This test makes a questionable assumption that the file pointer will
# be at eof after opening a file but before seeking, reading, or writing.
# Only known failure is on cygwin.
my $todo = $^OS_NAME eq "cygwin" && &PerlIO::get_layers($tst) eq 'stdio'
    && ' # TODO: file pointer not at eof';

if (tell($tst) == 6)
{ print $^STDOUT, "ok 28$todo\n"; } else { print $^STDOUT, "not ok 28$todo\n"; }
close $tst;