Automaton

Nov. 8, 2013, 2:57 p.m.
function Automaton(substr) {
    this.delta = [{"a":0, "b":1}, {"a":1, "b":0}];
    this.state = 0;
    this.search = function(str) {
        this.state = 0;
        for (var i = 0; i < str.length; i++) {
            this.state = this.delta[this.state][str.charAt(i)];
            WSH.Echo(this.state);
        }
    }
}

var a = new Automaton("...");
a.search("ababbbba");

Select

Feb. 2, 2013, 7:53 p.m.
my $paddr = inet_aton($addr);
croak "Cannot resolve '$addr'" if (!defined $paddr);
socket SOCK, PF_INET, SOCK_STREAM, getprotobyname('tcp')
    or croak 'Cannot create socket';
connect SOCK, sockaddr_in($port, $paddr)
    or croak "Cannot connect to server '$server'";
send SOCK, "$query\r\n", 0;
vec($rin, fileno(SOCK), 1) = 1;
do {
    ($nfound) = select($rout = $rin, '', '', $timeout);
    croak 'Select() error' if ($nfound == -1);
    croak 'Timeout' if ($nfound == 0);
    croak 'Recv() error' if (!defined(recv SOCK, $buf, 512, 0));
    $answer .= $buf;
} while $buf ne '';
shutdown SOCK, 2;
sub sendRaw($$$) {
    use constant IPPROTO_RAW => 255;
    my ($destination, $dport, $packet) = @_;
    eval {
        socket(SOCKET, PF_INET, SOCK_RAW, IPPROTO_RAW);
        my $paddr = sockaddr_in($dport, inet_aton($destination));
        send(SOCKET, $packet, 0, $paddr);
    };
    if ($@) {
        print "Error occured: $@";
    }
}

sub assembleRawUdp($$$$$) {
    my ($destination, $dport, $source, $sport, $data) = @_;

(Read more)

Tk

Feb. 2, 2013, 7:49 p.m.
#!/usr/bin/perl

use Tk;

sub Exit {
    exit(0);
}

sub showHelp {
    $tl = $root->Toplevel;
    $tl->title("Help");
    $tl->Label(-text => '(c) tswr')->pack();
}

(Read more)

Hamming Code

Feb. 2, 2013, 7:45 p.m.

Source

<html>
<head>
<title>Snippet for "Hamming code"</title>
<style>
body { padding: 5px; background-color: lightgoldenrodyellow }
</style>
<script type="text/javascript">
function copy() {
    var input = document.getElementById('input');
    var output = document.getElementById('output');
    output.value = input.value;
}
</script>
</head>
<body>
    <h4>Snippet for "Hamming code"</h4>
    <input type='text' id='input'></input>
    <input type='button' onclick='copy()' value='copy'></input><br>

    <input type='text' id='output'></input>
</body>
</html>

Demo