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|
#!./perl
BEGIN {
unless (find PerlIO::Layer 'perlio') {
print "1..0 # Skip: not perlio\n";
exit 0;
}
require Config;
if (($Config::Config{'extensions'} !~ m!\bPerlIO/scalar\b!) ){
print "1..0 # Skip -- Perl configured without PerlIO::scalar module\n";
exit 0;
}
}
use Fcntl qw(SEEK_SET SEEK_CUR SEEK_END); # Not 0, 1, 2 everywhere.
$| = 1;
use Test::More tests => 55;
my $fh;
my $var = "aaa\n";
ok(open($fh,"+<",\$var));
is(<$fh>, $var);
ok(eof($fh));
ok(seek($fh,0,SEEK_SET));
ok(!eof($fh));
ok(print $fh "bbb\n");
is($var, "bbb\n");
$var = "foo\nbar\n";
ok(seek($fh,0,SEEK_SET));
ok(!eof($fh));
is(<$fh>, "foo\n");
ok(close $fh, $!);
# Test that semantics are similar to normal file-based I/O
# Check that ">" clobbers the scalar
$var = "Something";
open $fh, ">", \$var;
is($var, "");
# Check that file offset set to beginning of scalar
my $off = tell($fh);
is($off, 0);
# Check that writes go where they should and update the offset
$var = "Something";
print $fh "Brea";
$off = tell($fh);
is($off, 4);
is($var, "Breathing");
close $fh;
# Check that ">>" appends to the scalar
$var = "Something ";
open $fh, ">>", \$var;
$off = tell($fh);
is($off, 10);
is($var, "Something ");
# Check that further writes go to the very end of the scalar
$var .= "else ";
is($var, "Something else ");
$off = tell($fh);
is($off, 10);
print $fh "is here";
is($var, "Something else is here");
close $fh;
# Check that updates to the scalar from elsewhere do not
# cause problems
$var = "line one\nline two\line three\n";
open $fh, "<", \$var;
while (<$fh>) {
$var = "foo";
}
close $fh;
is($var, "foo");
# Check that dup'ing the handle works
$var = '';
open $fh, "+>", \$var;
print $fh "xxx\n";
open $dup,'+<&',$fh;
print $dup "yyy\n";
seek($dup,0,SEEK_SET);
is(<$dup>, "xxx\n");
is(<$dup>, "yyy\n");
close($fh);
close($dup);
open $fh, '<', \42;
is(<$fh>, "42", "reading from non-string scalars");
close $fh;
{ package P; sub TIESCALAR {bless{}} sub FETCH { "shazam" } }
tie $p, P; open $fh, '<', \$p;
is(<$fh>, "shazam", "reading from magic scalars");
{
use warnings;
my $warn = 0;
local $SIG{__WARN__} = sub { $warn++ };
open my $fh, '>', \my $scalar;
print $fh "foo";
close $fh;
is($warn, 0, "no warnings when writing to an undefined scalar");
}
{
use warnings;
my $warn = 0;
local $SIG{__WARN__} = sub { $warn++ };
for (1..2) {
open my $fh, '>', \my $scalar;
close $fh;
}
is($warn, 0, "no warnings when reusing a lexical");
}
{
use warnings;
my $warn = 0;
local $SIG{__WARN__} = sub { $warn++ };
my $fetch = 0;
{
package MgUndef;
sub TIESCALAR { bless [] }
sub FETCH { $fetch++; return undef }
}
tie my $scalar, MgUndef;
open my $fh, '<', \$scalar;
close $fh;
is($warn, 0, "no warnings reading a magical undef scalar");
is($fetch, 1, "FETCH only called once");
}
{
use warnings;
my $warn = 0;
local $SIG{__WARN__} = sub { $warn++ };
my $scalar = 3;
undef $scalar;
open my $fh, '<', \$scalar;
close $fh;
is($warn, 0, "no warnings reading an undef, allocated scalar");
}
my $data = "a non-empty PV";
$data = undef;
open(MEM, '<', \$data) or die "Fail: $!\n";
my $x = join '', <MEM>;
is($x, '');
{
# [perl #35929] verify that works with $/ (i.e. test PerlIOScalar_unread)
my $s = <<'EOF';
line A
line B
a third line
EOF
open(F, '<', \$s) or die "Could not open string as a file";
local $/ = "";
my $ln = <F>;
close F;
is($ln, $s, "[perl #35929]");
}
# [perl #40267] PerlIO::scalar doesn't respect readonly-ness
{
ok(!(defined open(F, '>', \undef)), "[perl #40267] - $!");
close F;
my $ro = \43;
ok(!(defined open(F, '>', $ro)), $!);
close F;
# but we can read from it
ok(open(F, '<', $ro), $!);
is(<F>, 43);
close F;
}
{
# Check that we zero fill when needed when seeking,
# and that seeking negative off the string does not do bad things.
my $foo;
ok(open(F, '>', \$foo));
# Seeking forward should zero fill.
ok(seek(F, 50, SEEK_SET));
print F "x";
is(length($foo), 51);
like($foo, qr/^\0{50}x$/);
is(tell(F), 51);
ok(seek(F, 0, SEEK_SET));
is(length($foo), 51);
# Seeking forward again should zero fill but only the new bytes.
ok(seek(F, 100, SEEK_SET));
print F "y";
is(length($foo), 101);
like($foo, qr/^\0{50}x\0{49}y$/);
is(tell(F), 101);
# Seeking back and writing should not zero fill.
ok(seek(F, 75, SEEK_SET));
print F "z";
is(length($foo), 101);
like($foo, qr/^\0{50}x\0{24}z\0{24}y$/);
is(tell(F), 76);
# Seeking negative should not do funny business.
ok(!seek(F, -50, SEEK_SET), $!);
ok(seek(F, 0, SEEK_SET));
ok(!seek(F, -50, SEEK_CUR), $!);
ok(!seek(F, -150, SEEK_END), $!);
}
|
