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#!perl -w
use strict;
use IO::Handle; # ungetc()
use Test::More tests => 20;
require_ok q{PerlIO::scalar};
my $s = 'foo';
Internals::SvREADONLY($s, 1);
eval{
$s = 'bar';
};
like $@, qr/Modification of a read-only value/, '$s is readonly';
ok open(my $io, '<', \$s), 'open';
getc $io;
my $a = ord 'A';
note "buffer[$s]";
is $io->ungetc($a), $a, 'ungetc';
note "buffer[$s]";
is getc($io), chr($a), 'getc';
is $s, 'foo', '$s remains "foo"';
is getc($io), 'o', 'getc/2';
is getc($io), 'o', 'getc/3';
is getc($io), undef, 'getc/4';
for my $c($a .. ($a+10)){
is $io->ungetc($c), $c, "ungetc($c)";
}
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