Source for file core.is_trusted.php

<?php
/**
 * Smarty plugin
 * @package Smarty
 * @subpackage plugins
 */
 
/**
 * @access private
 */
/**
 * determines if a resource is trusted or not
 *
 * @param string $resource_type 
 * @param string $resource_name 
 * @return boolean 
 */
 
 // $resource_type, $resource_name
 
function smarty_core_is_trusted($params, &$smarty)
{
    $_smarty_trusted = false;
    if ($params['resource_type'] == 'file') {
        if (!empty($smarty->trusted_dir)) {
            $_rp = realpath($params['resource_name']);
            foreach ((array)$smarty->trusted_dir as $curr_dir) {
                if (!empty($curr_dir) && is_readable ($curr_dir)) {
                    $_cd = realpath($curr_dir);
                    if (strncmp($_rp, $_cd, strlen($_cd)) == 0
                        && $_rp{strlen($_cd)} == DIRECTORY_SEPARATOR ) {
                        $_smarty_trusted = true;
                        break;
                    }
                }
            }
        }
 
    } else {
        // resource is not on local file system
        $_smarty_trusted = call_user_func_array($smarty->_plugins['resource'][$params['resource_type']][0][3],
                                                array($params['resource_name'], $smarty));
    }
 
    return $_smarty_trusted;
}
 
/* vim: set expandtab: */
 
?>