<?php /** @file */

function dba_factory($server,$user,$pass,$db,$install = false) {
	$dba = null;

	if(class_exists('mysqli')) {
		require_once('include/dba/dba_mysqli.php');
		$dba = new dba_mysqli($server,$user,$pass,$db,$install);
	}
	else {
		require_once('include/dba/dba_mysql.php');
		$dba = new dba_mysql($server,$user,$pass,$db,$install);
	}
	$dba->connect($server,$user,$pass,$db);

	return $dba;
}


abstract class dba_driver {

	protected $debug = 0;
	protected $driver;
	protected $db;
	public  $connected = false;
	public  $error = false;

	abstract function connect($server,$user,$pass,$db);
	abstract function q($sql);
	abstract function escape($str);
	abstract function close();

	function __construct($server,$user,$pass,$db,$install = false) {
		if($install)
			$this->install($server,$user,$pass,$db);
		$this->connect($server,$user,$pass,$db);
	}


	function install($server,$user,$pass,$db) {
		$server = trim($server);
		$user = trim($user);
		$pass = trim($pass);
		$db = trim($db);

		if (!(strlen($server) && strlen($user))){
			$this->connected = false;
			$this->db = null;
			return;
		}

		if(strlen($server) && ($server !== 'localhost') && ($server !== '127.0.0.1')) {
			if(! dns_get_record($server, DNS_A + DNS_CNAME + DNS_PTR)) {
				$this->error = sprintf( t('Cannot locate DNS info for database server \'%s\''), $server);
				$this->connected = false;
				$this->db = null;
				return;
			}
		}
	}


}


function printable($s) {
	$s = preg_replace("~([\x01-\x08\x0E-\x0F\x10-\x1F\x7F-\xFF])~",".", $s);
	$s = str_replace("\x00",'.',$s);
	if(x($_SERVER,'SERVER_NAME'))
		$s = escape_tags($s);
	return $s;
}

// Procedural functions

function dbg($state) {
	global $db;
	if($db)
	$db->dbg($state);
}


function dbesc($str) {
	global $db;
	if($db && $db->connected)
		return($db->escape($str));
	else
		return(str_replace("'","\\'",$str));
}


// Function: q($sql,$args);
// Description: execute SQL query with printf style args.
// Example: $r = q("SELECT * FROM `%s` WHERE `uid` = %d",
//                   'user', 1);


function q($sql) {

	global $db;
	$args = func_get_args();
	unset($args[0]);

	if($db && $db->connected) {
		$stmt = vsprintf($sql,$args);
		if($stmt === false)
			logger('dba: vsprintf error: ' . print_r(debug_backtrace(),true));
		return $db->q($stmt);
	}

	/**
	 *
	 * This will happen occasionally trying to store the 
	 * session data after abnormal program termination 
	 *
	 */
	logger('dba: no database: ' . print_r($args,true));
	return false; 

}

/**
 *
 * Raw db query, no arguments
 *
 */


function dbq($sql) {

	global $db;
	if($db && $db->connected)
		$ret = $db->q($sql);
	else
		$ret = false;
	return $ret;
}


// Caller is responsible for ensuring that any integer arguments to 
// dbesc_array are actually integers and not malformed strings containing
// SQL injection vectors. All integer array elements should be specifically 
// cast to int to avoid trouble. 


function dbesc_array_cb(&$item, $key) {
	if(is_string($item))
		$item = dbesc($item);
}


function dbesc_array(&$arr) {
	if(is_array($arr) && count($arr)) {
		array_walk($arr,'dbesc_array_cb');
	}
}