--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/addressbook.class.php	Tue Oct 25 22:24:36 2011 +0200
@@ -0,0 +1,75 @@
+<?
+interface AdressBook_Interface {
+    public function get_entries();
+    public function search_entries($pattern);
+    public function add_entry($entry);
+}
+
+class AddressBook implements AdressBook_Interface {
+
+    const RS = "\n";
+    const FS = "\t";
+
+    private $fh;
+    private $file;
+
+    function __construct($file) {
+	@mkdir(dirname($file));
+	$this->fh = fopen($file, "a+b");
+	flock($this->fh, LOCK_EX);
+	$stat = fstat($this->fh);
+	if ($stat['size'] == 0) {
+		fputs($this->fh, join(self::FS, array("Hans Hanson", "0815", "hans@hanson.de"))
+			. self::RS);
+	}
+	flock($this->fh, LOCK_SH);
+	fseek($this->fh, 0, SEEK_SET);
+    }
+
+    function get_entries() {
+	$entries = array();
+	fseek($this->fh, 0, SEEK_SET);
+	while($line = stream_get_line($this->fh, 0, self::RS)) {
+		if ($line === FALSE) break;
+		$entries[] = explode(self::FS, $line);
+	}
+	return $entries;
+    }
+
+    function add_entry($entry) {
+	$fields = array('name', 'tel', 'mail');
+
+	$new = array();
+	foreach($fields as $key) {
+		if (!isset($entry[$key])) return false;
+		$new[$key] = trim($entry[$key]);
+		$new[$key] = preg_replace('/['.self::RS.self::FS.' ]+/', ' ', $new[$key]);
+		if (empty($new[$key])) return false;
+	}
+
+	flock($this->fh, LOCK_EX);
+	fputs($this->fh, join(self::FS, $new) . self::RS);
+	flock($this->fh, LOCK_UN);
+
+	return true;
+    }
+
+    function search_entries($pattern) {
+	$pattern = trim($pattern);
+	if (empty($pattern)) return;
+	$pattern = preg_replace('/\//', '\/', $pattern);
+	fseek($this->fh, 0, SEEK_SET);
+	$entries = array();
+	while ($line = stream_get_line($this->fh, 0, self::RS)) {
+		if ($line === FALSE) break;
+		if (!preg_match("/$pattern/i", $line)) continue;
+		$entry = explode(self::FS, $line);
+		$entries[] = array('name' => $entry[0],
+			           'tel' => $entry[1],
+				   'mail' => $entry[2]);
+	}
+	return $entries;
+    }
+}
+
+?>