C:/drupal/includes/common.inc

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<?php
// $Id: common.inc,v 1.770 2008/05/30 17:41:51 dries Exp $

define('SAVED_NEW', 1);

define('SAVED_UPDATED', 2);

define('SAVED_DELETED', 3);

function drupal_set_content($region = NULL, $data = NULL) {
  static $content = array();

  if (!is_null($region) && !is_null($data)) {
    $content[$region][] = $data;
  }
  return $content;
}

function drupal_get_content($region = NULL, $delimiter = ' ') {
  $content = drupal_set_content();
  if (isset($region)) {
    if (isset($content[$region]) && is_array($content[$region])) {
      return implode($delimiter, $content[$region]);
    }
  }
  else {
    foreach (array_keys($content) as $region) {
      if (is_array($content[$region])) {
        $content[$region] = implode($delimiter, $content[$region]);
      }
    }
    return $content;
  }
}

function drupal_set_breadcrumb($breadcrumb = NULL) {
  static $stored_breadcrumb;

  if (!is_null($breadcrumb)) {
    $stored_breadcrumb = $breadcrumb;
  }
  return $stored_breadcrumb;
}

function drupal_get_breadcrumb() {
  $breadcrumb = drupal_set_breadcrumb();

  if (is_null($breadcrumb)) {
    $breadcrumb = menu_get_active_breadcrumb();
  }

  return $breadcrumb;
}

function drupal_set_html_head($data = NULL) {
  static $stored_head = '';

  if (!is_null($data)) {
    $stored_head .= $data . "\n";
  }
  return $stored_head;
}

function drupal_get_html_head() {
  $output = "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />\n";
  return $output . drupal_set_html_head();
}

function drupal_clear_path_cache() {
  drupal_lookup_path('wipe');
}

function drupal_set_header($header = NULL) {
  // We use an array to guarantee there are no leading or trailing delimiters.
  // Otherwise, header('') could get called when serving the page later, which
  // ends HTTP headers prematurely on some PHP versions.
  static $stored_headers = array();

  if (strlen($header)) {
    header($header);
    $stored_headers[] = $header;
  }
  return implode("\n", $stored_headers);
}

function drupal_get_headers() {
  return drupal_set_header();
}

function drupal_add_feed(a> = NULL, $title = '') {
  static $stored_feed_links = array();

  if (!is_null(a>) && !isset($stored_feed_links[a>])) {
    $stored_feed_links[$url] = theme('feed_icon', $url, $title);

    drupal_add_link(array('rel' => 'alternate',
                          'type' => 'application/rss+xml',
                          'title' => $title,
                          'href' => $url));
  }
  return $stored_feed_links;
}

function drupal_get_feeds($delimiter = "\n") {
  $feeds = drupal_add_feed();
  return implode($feeds, $delimiter);
}

function drupal_query_string_encode($query, $exclude = array(), $parent = '') {
  $params = array();

  foreach ($query as $key => $value) {
    $key = drupal_urlencode($key);
    if ($parent) {
      $key = $parent . '[' . $key . ']';
    }

    if (in_array($key, $exclude)) {
      continue;
    }

    if (is_array($value)) {
      $params[] = drupal_query_string_encode($value, $exclude, $key);
    }
    else {
      $params[] = $key . '=' . drupal_urlencode($value);
    }
  }

  return implode('&', $params);
}

function drupal_get_destination() {
  if (isset($_REQUEST['destination'])) {
    return 'destination=' . urlencode($_REQUEST['destination']);
  }
  else {
    // Use $_GET here to retrieve the original path in source form.
    $path = isset($_GET['q']) ? $_GET['q'] : '';
    $query = drupal_query_string_encode($_GET, array('q'));
    if ($query != '') {
      $path .= '?' . $query;
    }
    return 'destination=' . urlencode($path);
  }
}

function drupal_goto($path = '', $query = NULL, $fragment = NULL, $http_response_code = 302) {

  if (isset($_REQUEST['destination'])) {
    extract(parse_url(span>])));
  }
  else if (isset($_REQUEST['edit']['destination'])) {
    extract(parse_url(urldecode($_REQUEST['edit']['destination'])));
  }

  a> = url($path, array('query' => $query, 'fragment' => $fragment, 'absolute' => TRUE));
  // Remove newlines from the URL to avoid header injection attacks.
  a> = str_replace(array("\n", "\r"), '', a>);

  // Allow modules to react to the end of the page request before redirecting.
  // We do not want this while running update.php.
  if (!defined('MAINTENANCE_MODE') || MAINTENANCE_MODE != 'update') {
    module_invoke_all('exit', a>);
  }

  // Even though session_write_close() is registered as a shutdown function, we
  // need all session data written to the database before redirecting.
  session_write_close();

  header('Location: ' . a>, TRUE, $http_response_code);

  // The "Location" header sends a redirect status code to the HTTP daemon. In
  // some cases this can be wrong, so we make sure none of the code below the
  // drupal_goto() call gets executed upon redirection.
  exit();
}

function drupal_site_offline() {
  drupal_maintenance_theme();
  drupal_set_header('HTTP/1.1 503 Service unavailable');
  drupal_set_title(t('Site off-line'));
  print theme('maintenance_page', filter_xss_admin(variable_get('site_offline_message',
    t('@site is currently under maintenance. We should be back shortly. Thank you for your patience.', array('@site' => variable_get('site_name', 'Drupal'))))));
}

function drupal_not_found() {
  drupal_set_header('HTTP/1.1 404 Not Found');

  watchdog('page not found', check_plain($_GET['q']), NULL, WATCHDOG_WARNING);

  // Keep old path for reference.
  if (!isset($_REQUEST['destination'])) {
    $_REQUEST['destination'] = $_GET['q'];
  }

  $path = drupal_get_normal_path(variable_get('site_404', ''));
  if ($path && $path != $_GET['q']) {
    // Set the active item in case there are tabs to display, or other
    // dependencies on the path.
    menu_set_active_item($path);
    $return = menu_execute_active_handler($path);
  }

  if (empty($return) || $return == MENU_NOT_FOUND || $return == MENU_ACCESS_DENIED) {
    drupal_set_title(t('Page not found'));
    $return = t('The requested page could not be found.');
  }

  // To conserve CPU and bandwidth, omit the blocks.
  print theme('page', $return, FALSE);
}

function drupal_access_denied() {
  drupal_set_header('HTTP/1.1 403 Forbidden');
  watchdog('access denied', check_plain($_GET['q']), NULL, WATCHDOG_WARNING);

  // Keep old path for reference.
  if (!isset($_REQUEST['destination'])) {
    $_REQUEST['destination'] = $_GET['q'];
  }

  $path = drupal_get_normal_path(variable_get('site_403', ''));
  if ($path && $path != $_GET['q']) {
    // Set the active item in case there are tabs to display or other
    // dependencies on the path.
    menu_set_active_item($path);
    $return = menu_execute_active_handler($path);
  }

  if (empty($return) || $return == MENU_NOT_FOUND || $return == MENU_ACCESS_DENIED) {
    drupal_set_title(t('Access denied'));
    $return = t('You are not authorized to access this page.');
  }
  print theme('page', $return);
}

function drupal_http_request(a>, $headers = array(), $method = 'GET', $data = NULL, $retry = 3) {
  static $self_test = FALSE;
  $result = new stdClass();
  // Try to clear the drupal_http_request_fails variable if it's set. We
  // can't tie this call to any error because there is no surefire way to
  // tell whether a request has failed, so we add the check to places where
  // some parsing has failed.
  if (!$self_test && variable_get('drupal_http_request_fails', FALSE)) {
    $self_test = TRUE;
    $works = module_invoke('system', 'check_http_request');
    $self_test = FALSE;
    if (!$works) {
      // Do not bother with further operations if we already know that we
      // have no chance.
      $result->error = t("The server can't issue HTTP requests");
      return $result;
    }
  }

  // Parse the URL and make sure we can handle the schema.
  $uri = parse_url(a>);

  switch ($uri['scheme']) {
    case 'http':
      $port = isset($uri['port']) ? $uri['port'] : 80;
      $host = $uri['host'] . ($port != 80 ? ':' . $port : '');
      $fp = @fsockopen($uri['host'], $port, $errno, $errstr, 15);
      break;
    case 'https':
      // Note: Only works for PHP 4.3 compiled with OpenSSL.
      $port = isset($uri['port']) ? $uri['port'] : 443;
      $host = $uri['host'] . ($port != 443 ? ':' . $port : '');
      $fp = @fsockopen('ssl://' . $uri['host'], $port, $errno, $errstr, 20);
      break;
    default:
      $result->error = 'invalid schema ' . $uri['scheme'];
      return $result;
  }

  // Make sure the socket opened properly.
  if (!$fp) {
    // When a network error occurs, we use a negative number so it does not
    // clash with the HTTP status codes.
    $result->code = -$errno;
    $result->error = trim($errstr);
    return $result;
  }

  // Construct the path to act on.
  $path = isset($uri['path']) ? $uri['path'] : '/';
  if (isset($uri['query'])) {
    $path .= '?' . $uri['query'];
  }

  // Create HTTP request.
  $defaults = array(
    // RFC 2616: "non-standard ports MUST, default ports MAY be included".
    // We don't add the port to prevent from breaking rewrite rules checking the
    // host that do not take into account the port number.
    'Host' => "Host: $host",
    'User-Agent' => 'User-Agent: Drupal (+http://drupal.org/)',
    'Content-Length' => 'Content-Length: ' . strlen($data)
  );

  // If the server url has a user then attempt to use basic authentication
  if (isset($uri['user'])) {
    $defaults['Authorization'] = 'Authorization: Basic ' . base64_encode($uri['user'] . (!empty($uri['pass']) ? ":" . $uri['pass'] : ''));
  }

  foreach ($headers as $header => $value) {
    $defaults[$header] = $header . ': ' . $value;
  }

  $request = $method . ' ' . $path . " HTTP/1.0\r\n";
  $request .= implode("\r\n", $defaults);
  $request .= "\r\n\r\n";
  if ($data) {
    $request .= $data . "\r\n";
  }
  $result->request = $request;

  fwrite($fp, $request);

  // Fetch response.
  $response = '';
  while (!feof($fp) && $chunk = fread($fp, 1024)) {
    $response .= $chunk;
  }
  fclose($fp);

  // Parse response.
  list($split, $result->data) = explode("\r\n\r\n", $response, 2);
  $split = preg_split("/\r\n|\n|\r/", $split);

  list($protocol, $code, $text) = explode(' ', trim(array_shift($split)), 3);
  $result->headers = array();

  // Parse headers.
  while ($line = trim(array_shift($split))) {
    list($header, $value) = explode(':', $line, 2);
    if (isset($result->headers[$header]) && $header == 'Set-Cookie') {
      // RFC 2109: the Set-Cookie response header comprises the token Set-
      // Cookie:, followed by a comma-separated list of one or more cookies.
      $result->headers[$header] .= ',' . trim($value);
    }
    else {
      $result->headers[$header] = trim($value);
    }
  }

  $responses = array(
    100 => 'Continue', 101 => 'Switching Protocols',
    200 => 'OK', 201 => 'Created', 202 => 'Accepted', 203 => 'Non-Authoritative Information', 204 => 'No Content', 205 => 'Reset Content', 206 => 'Partial Content',
    300 => 'Multiple Choices', 301 => 'Moved Permanently', 302 => 'Found', 303 => 'See Other', 304 => 'Not Modified', 305 => 'Use Proxy', 307 => 'Temporary Redirect',
    400 => 'Bad Request', 401 => 'Unauthorized', 402 => 'Payment Required', 403 => 'Forbidden', 404 => 'Not Found', 405 => 'Method Not Allowed', 406 => 'Not Acceptable', 407 => 'Proxy Authentication Required', 408 => 'Request Time-out', 409 => 'Conflict', 410 => 'Gone', 411 => 'Length Required', 412 => 'Precondition Failed', 413 => 'Request Entity Too Large', 414 => 'Request-URI Too Large', 415 => 'Unsupported Media Type', 416 => 'Requested range not satisfiable', 417 => 'Expectation Failed',
    500 => 'Internal Server Error', 501 => 'Not Implemented', 502 => 'Bad Gateway', 503 => 'Service Unavailable', 504 => 'Gateway Time-out', 505 => 'HTTP Version not supported'
  );
  // RFC 2616 states that all unknown HTTP codes must be treated the same as the
  // base code in their class.
  if (!isset($responses[$code])) {
    $code = floor($code / 100) * 100;
  }

  switch ($code) {
    case 200: // OK
    case 304: // Not modified
      break;
    case 301: // Moved permanently
    case 302: // Moved temporarily
    case 307: // Moved temporarily
      $location = $result->headers['Location'];

      if ($retry) {
        $result = drupal_http_request($result->headers['Location'], $headers, $method, $data, --$retry);
        $result->redirect_code = $result->code;
      }
      $result->redirect_url = $location;

      break;
    default:
      $result->error = $text;
  }

  $result->code = $code;
  return $result;
}
function drupal_error_handler($errno, $message, $filename, $line, $context) {
  // If the @ error suppression operator was used, error_reporting is
  // temporarily set to 0.
  if (error_reporting() == 0) {
    return;
  }

  if ($errno & (E_ALL)) {
    $types = array(1 => 'error', 2 => 'warning', 4 => 'parse error', 8 => 'notice', 16 => 'core error', 32 => 'core warning', 64 => 'compile error', 128 => 'compile warning', 256 => 'user error', 512 => 'user warning', 1024 => 'user notice', 2048 => 'strict warning', 4096 => 'recoverable fatal error');

    // For database errors, we want the line number/file name of the place that
    // the query was originally called, not _db_query().
    if (isset($context[DB_ERROR])) {
      $backtrace = array_reverse(debug_backtrace());

      // List of functions where SQL queries can originate.
      $query_functions = array('db_query', 'pager_query', 'db_query_range', 'db_query_temporary', 'update_sql');

      // Determine where query function was called, and adjust line/file
      // accordingly.
      foreach ($backtrace as $index => $function) {
        if (in_array($function['function'], $query_functions)) {
          $line = $backtrace[$index]['line'];
          $filename = $backtrace[$index]['file'];
          break;
        }
      }
    }

    $entry = $types[$errno] . ': ' . $message . ' in ' . $filename . ' on line ' . $line . '.';

    // Force display of error messages in update.php.
    if (variable_get('error_level', 1) == 1 || strstr($_SERVER['SCRIPT_NAME'], 'update.php')) {
      drupal_set_message($entry, 'error');
    }

    watchdog('php', '%message in %file on line %line.', array('%error' => $types[$errno], '%message' => $message, '%file' => $filename, '%line' => $line), WATCHDOG_ERROR);
  }
}

function _fix_gpc_magic(&$item) {
  if (is_array($item)) {
    array_walk($item, '_fix_gpc_magic');
  }
  else {
    $item = stripslashes($item);
  }
}

function _fix_gpc_magic_files(&$item, $key) {
  if ($key != 'tmp_name') {
    if (is_array($item)) {
      array_walk($item, '_fix_gpc_magic_files');
    }
    else {
      $item = stripslashes($item);
    }
  }
}

function fix_gpc_magic() {
  static $fixed = FALSE;
  if (!$fixed && ini_get('magic_quotes_gpc')) {
    array_walk($_GET, '_fix_gpc_magic');
    array_walk($_POST, '_fix_gpc_magic');
    array_walk($_COOKIE, '_fix_gpc_magic');
    array_walk($_REQUEST, '_fix_gpc_magic');
    array_walk($_FILES, '_fix_gpc_magic_files');
    $fixed = TRUE;
  }
}

function t($string, $args = array(), $langcode = NULL) {
  global $language;
  static $custom_strings;

  $langcode = isset($langcode) ? $langcode : $language->language;

  // First, check for an array of customized strings. If present, use the array
  // *instead of* database lookups. This is a high performance way to provide a
  // handful of string replacements. See settings.php for examples.
  // Cache the $custom_strings variable to improve performance.
  if (!isset($custom_strings[$langcode])) {
    $custom_strings[$langcode] = variable_get('locale_custom_strings_' . $langcode, array());
  }
  // Custom strings work for English too, even if locale module is disabled.
  if (isset($custom_strings[$langcode][$string])) {
    $string = $custom_strings[$langcode][$string];
  }
  // Translate with locale module if enabled.
  elseif (function_exists('locale') && $langcode != 'en') {
    $string = locale($string, $langcode);
  }
  if (empty($args)) {
    return $string;
  }
  else {
    // Transform arguments before inserting them.
    foreach ($args as $key => $value) {
      switch ($key[0]) {
        case '@':
          // Escaped only.
          $args[$key] = check_plain($value);
          break;

        case '%':
        default:
          // Escaped and placeholder.
          $args[$key] = theme('placeholder', $value);
          break;

        case '!':
          // Pass-through.
      }
    }
    return strtr($string, $args);
  }
}

function valid_email_address($mail) {
  $user = '[a-zA-Z0-9_\-\.\+\^!#\$%&*+\/\=\?\`\|\{\}~\']+';
  $domain = '(?:(?:[a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.?)+';
  $ipv4 = '[0-9]{1,3}(\.[0-9]{1,3}){3}';
  $ipv6 = '[0-9a-fA-F]{1,4}(\:[0-9a-fA-F]{1,4}){7}';

  return preg_match("/^$user@($domain|(\[($ipv4|$ipv6)\]))$/", $mail);
}

function valid_url(a>, $absolute = FALSE) {
  $allowed_characters = '[a-z0-9\/:_\-_\.\?\$,;~=#&%\+]';
  if ($absolute) {
    return preg_match("/^(http|https|ftp):\/\/" . $allowed_characters . "+$/i", a>);
  }
  else {
    return preg_match("/^" . $allowed_characters . "+$/i", a>);
  }
}

function flood_register_event($name) {
  db_query("INSERT INTO {flood} (event, hostname, timestamp) VALUES ('%s', '%s', %d)", $name, ip_address(), time());
}

function flood_is_allowed($name, $threshold) {
  $number = db_result(db_query("SELECT COUNT(*) FROM {flood} WHERE event = '%s' AND hostname = '%s' AND timestamp > %d", $name, ip_address(), time() - 3600));
  return ($number < $threshold ? TRUE : FALSE);
}

function check_file($filename) {
  return is_uploaded_file($filename);
}

function check_url($uri) {
  return filter_xss_bad_protocol($uri, FALSE);
}

function format_rss_channel($title, $link, $description, $items, $langcode = NULL, $args = array()) {
  global $language;
  $langcode = $langcode ? $langcode : $language->language;

  $output = "<channel>\n";
  $output .= ' <title>' . check_plain($title) . "</title>\n";
  $output .= ' <link>' . check_url($link) . "</link>\n";

  // The RSS 2.0 "spec" doesn't indicate HTML can be used in the description.
  // We strip all HTML tags, but need to prevent double encoding from properly
  // escaped source data (such as &amp becoming &amp;amp;).
  $output .= ' <description>' . check_plain(decode_entities(strip_tags($description))) . "</description>\n";
  $output .= ' <language>' . check_plain($langcode) . "</language>\n";
  $output .= format_xml_elements($args);
  $output .= $items;
  $output .= "</channel>\n";

  return $output;
}

function format_rss_item($title, $link, $description, $args = array()) {
  $output = "<item>\n";
  $output .= ' <title>' . check_plain($title) . "</title>\n";
  $output .= ' <link>' . check_url($link) . "</link>\n";
  $output .= ' <description>' . check_plain($description) . "</description>\n";
  $output .= format_xml_elements($args);
  $output .= "</item>\n";

  return $output;
}

function format_xml_elements($array) {
  $output = '';
  foreach ($array as $key => $value) {
    if (is_numeric($key)) {
      if ($value['key']) {
        $output .= ' <' . $value['key'];
        if (isset($value['attributes']) && is_array($value['attributes'])) {
          $output .= drupal_attributes($value['attributes']);
        }

        if ($value['value'] != '') {
          $output .= '>' . (is_array($value['value']) ? format_xml_elements($value['value']) : check_plain($value['value'])) . '</' . $value['key'] . ">\n";
        }
        else {
          $output .= " />\n";
        }
      }
    }
    else {
      $output .= ' <' . $key . '>' . (is_array($value) ? format_xml_elements($value) : check_plain($value)) . "</$key>\n";
    }
  }
  return $output;
}

function format_plural($count, $singular, $plural, $args = array(), $langcode = NULL) {
  $args['@count'] = $count;
  if ($count == 1) {
    return t($singular, $args, $langcode);
  }

  // Get the plural index through the gettext formula.
  $index = (function_exists('locale_get_plural')) ? locale_get_plural($count, $langcode) : -1;
  // Backwards compatibility.
  if ($index < 0) {
    return t($plural, $args, $langcode);
  }
  else {
    switch ($index) {
      case "0":
        return t($singular, $args, $langcode);
      case "1":
        return t($plural, $args, $langcode);
      default:
        unset($args['@count']);
        $args['@count[' . $index . ']'] = $count;
        return t(strtr($plural, array('@count' => '@count[' . $index . ']')), $args, $langcode);
    }
  }
}

function parse_size($size) {
  $suffixes = array(
    '' => 1,
    'k' => 1024,
    'm' => 1048576, // 1024 * 1024
    'g' => 1073741824, // 1024 * 1024 * 1024
  );
  if (preg_match('/([0-9]+)\s*(k|m|g)?(b?(ytes?)?)/i', $size, $match)) {
    return $match[1] * $suffixes[drupal_strtolower($match[2])];
  }
}

function format_size($size, $langcode = NULL) {
  if ($size < 1024) {
    return format_plural($size, '1 byte', '@count bytes', array(), $langcode);
  }
  else {
    $size = round($size / 1024, 2);
    $suffix = t('KB', array(), $langcode);
    if ($size >= 1024) {
      $size = round($size / 1024, 2);
      $suffix = t('MB', array(), $langcode);
    }
    return t('@size @suffix', array('@size' => $size, '@suffix' => $suffix), $langcode);
  }
}

function format_interval($timestamp, $granularity = 2, $langcode = NULL) {
  $units = array('1 year|@count years' => 31536000, '1 week|@count weeks' => 604800, '1 day|@count days' => 86400, '1 hour|@count hours' => 3600, '1 min|@count min' => 60, '1 sec|@count sec' => 1);
  $output = '';
  foreach ($units as $key => $value) {
    $key = explode('|', $key);
    if ($timestamp >= $value) {
      $output .= ($output ? ' ' : '') . format_plural(floor($timestamp / $value), $key[0], $key[1], array(), $langcode);
      $timestamp %= $value;
      $granularity--;
    }

    if ($granularity == 0) {
      break;
    }
  }
  return $output ? $output : t('0 sec', array(), $langcode);
}

function format_date($timestamp, $type = 'medium', $format = '', $timezone = NULL, $langcode = NULL) {
  if (!isset($timezone)) {
    global $user;
    if (variable_get('configurable_timezones', 1) && $user->uid && strlen($user->timezone)) {
      $timezone = $user->timezone;
    }
    else {
      $timezone = variable_get('date_default_timezone', 0);
    }
  }

  $timestamp += $timezone;

  switch ($type) {
    case 'small':
      $format = variable_get('date_format_short', 'm/d/Y - H:i');
      break;
    case 'large':
      $format = variable_get('date_format_long', 'l, F j, Y - H:i');
      break;
    case 'custom':
      // No change to format.
      break;
    case 'medium':
    default:
      $format = variable_get('date_format_medium', 'D, m/d/Y - H:i');
  }

  $max = strlen($format);
  $date = '';
  for ($i = 0; $i < $max; $i++) {
    $c = $format[$i];
    if (strpos('AaDlM', $c) !== FALSE) {
      $date .= t(gmdate($c, $timestamp), array(), $langcode);
    }
    else if ($c == 'F') {
      // Special treatment for long month names: May is both an abbreviation
      // and a full month name in English, but other languages have
      // different abbreviations.
      $date .= trim(t('!long-month-name ' . gmdate($c, $timestamp), array('!long-month-name' => ''), $langcode));
    }
    else if (strpos('BdgGhHiIjLmnsStTUwWYyz', $c) !== FALSE) {
      $date .= gmdate($c, $timestamp);
    }
    else if ($c == 'r') {
      $date .= format_date($timestamp - $timezone, 'custom', 'D, d M Y H:i:s O', $timezone, $langcode);
    }
    else if ($c == 'O') {
      $date .= sprintf('%s%02d%02d', ($timezone < 0 ? '-' : '+'), abs($timezone / 3600), abs($timezone % 3600) / 60);
    }
    else if ($c == 'Z') {
      $date .= $timezone;
    }
    else if ($c == '\\') {
      $date .= $format[++$i];
    }
    else {
      $date .= $c;
    }
  }

  return $date;
}

function url($path = NULL, $options = array()) {
  // Merge in defaults.
  $options += array(
    'fragment' => '',
    'query' => '',
    'absolute' => FALSE,
    'alias' => FALSE,
    'prefix' => ''
  );
  if (!isset($options['external'])) {
    // Return an external link if $path contains an allowed absolute URL.
    // Only call the slow filter_xss_bad_protocol if $path contains a ':' before
    // any / ? or #.
    $colonpos = strpos($path, ':');
    $options['external'] = ($colonpos !== FALSE && !preg_match('![/?#]!', substr($path, 0, $colonpos)) && filter_xss_bad_protocol($path, FALSE) == check_plain($path));
  }

  // May need language dependent rewriting if language.inc is present.
  if (function_exists('language_url_rewrite')) {
    language_url_rewrite($path, $options);
  }
  if ($options['fragment']) {
    $options['fragment'] = '#' . $options['fragment'];
  }
  if (is_array($options['query'])) {
    $options['query'] = drupal_query_string_encode($options['query']);
  }

  if ($options['external']) {
    // Split off the fragment.
    if (strpos($path, '#') !== FALSE) {
      list($path, $old_fragment) = explode('#', $path, 2);
      if (isset($old_fragment) && !$options['fragment']) {
        $options['fragment'] = '#' . $old_fragment;
      }
    }
    // Append the query.
    if ($options['query']) {
      $path .= (strpos($path, '?') !== FALSE ? '&' : '?') . $options['query'];
    }
    // Reassemble.
    return $path . $options['fragment'];
  }

  global $base_url;
  static $script;
  static $clean_url;

  if (!isset($script)) {
    // On some web servers, such as IIS, we can't omit "index.php". So, we
    // generate "index.php?q=foo" instead of "?q=foo" on anything that is not
    // Apache.
    $script = (strpos($_SERVER['SERVER_SOFTWARE'], 'Apache') === FALSE) ? 'index.php' : '';
  }

  // Cache the clean_url variable to improve performance.
  if (!isset($clean_url)) {
    $clean_url = (bool)variable_get('clean_url', '0');
  }

  if (!isset($options['base_url'])) {
    // The base_url might be rewritten from the language rewrite in domain mode.
    $options['base_url'] = $base_url;
  }

  // Preserve the original path before aliasing.
  $original_path = $path;

  // The special path '<front>' links to the default front page.
  if ($path == '<front>') {
    $path = '';
  }
  elseif (!empty($path) && !$options['alias']) {
    $path = drupal_get_path_alias($path, isset($options['language']) ? $options['language']->language : '');
  }

  if (function_exists('custom_url_rewrite_outbound')) {
    // Modules may alter outbound links by reference.
    custom_url_rewrite_outbound($path, $options, $original_path);
  }

  $base = $options['absolute'] ? $options['base_url'] . '/' : base_path();
  $prefix = empty($path) ? rtrim($options['prefix'], '/') : $options['prefix'];
  $path = drupal_urlencode($prefix . $path);

  if ($clean_url) {
    // With Clean URLs.
    if ($options['query']) {
      return $base . $path . '?' . $options['query'] . $options['fragment'];
    }
    else {
      return $base . $path . $options['fragment'];
    }
  }
  else {
    // Without Clean URLs.
    $variables = array();
    if (!empty($path)) {
      $variables[] = 'q=' . $path;
    }
    if (!empty($options['query'])) {
      $variables[] = $options['query'];
    }
    if ($query = join('&', $variables)) {
      return $base . $script . '?' . $query . $options['fragment'];
    }
    else {
      return $base . $options['fragment'];
    }
  }
}

function drupal_attributes($attributes = array()) {
  if (is_array($attributes)) {
    $t = '';
    foreach ($attributes as $key => $value) {
      $t .= " $key=" . '"' . check_plain($value) . '"';
    }
    return $t;
  }
}

function l($text, $path, $options = array()) {
  // Merge in defaults.
  $options += array(
      'attributes' => array(),
      'html' => FALSE,
    );

  // Append active class.
  if ($path == $_GET['q'] || ($path == '<front>' && drupal_is_front_page())) {
    if (isset($options['attributes']['class'])) {
      $options['attributes']['class'] .= ' active';
    }
    else {
      $options['attributes']['class'] = 'active';
    }
  }

  // Remove all HTML and PHP tags from a tooltip. For best performance, we act only
  // if a quick strpos() pre-check gave a suspicion (because strip_tags() is expensive).
  if (isset($options['attributes']['title']) && strpos($options['attributes']['title'], '<') !== FALSE) {
    $options['attributes']['title'] = strip_tags($options['attributes']['title']);
  }

  return '<a href="' . check_url(url($path, $options)) . '"' . drupal_attributes($options['attributes']) . '>' . ($options['html'] ? $text : check_plain($text)) . '</a>';
}

function drupal_page_footer() {

  if (variable_get('cache', CACHE_DISABLED) != CACHE_DISABLED) {
    page_set_cache();
  }

  module_invoke_all('exit');

  registry_cache_hook_implementations(FALSE, TRUE);
  registry_cache_path_files();
}

function drupal_map_assoc($array, $function = NULL) {
  if (!isset($function)) {
    $result = array();
    foreach ($array as $value) {
      $result[$value] = $value;
    }
    return $result;
  }
  elseif (function_exists($function)) {
    $result = array();
    foreach ($array as $value) {
      $result[$value] = $function($value);
    }
    return $result;
  }
}

function drupal_eval($code) {
  global $theme_path, $theme_info, $conf;

  // Store current theme path.
  $old_theme_path = $theme_path;

  // Restore theme_path to the theme, as long as drupal_eval() executes,
  // so code evaluted will not see the caller module as the current theme.
  // If theme info is not initialized get the path from theme_default.
  if (!isset($theme_info)) {
    $theme_path = drupal_get_path('theme', $conf['theme_default']);
  }
  else {
    $theme_path = dirname($theme_info->filename);
  }

  ob_start();
  print eval('?>' . $code);
  $output = ob_get_contents();
  ob_end_clean();

  // Recover original theme path.
  $theme_path = $old_theme_path;

  return $output;
}

function drupal_get_path($type, $name) {
  return dirname(drupal_get_filename($type, $name));
}

function base_path() {
  return $GLOBALS['base_path'];
}

function drupal_add_link($attributes) {
  drupal_set_html_head('<link' . drupal_attributes($attributes) . " />\n");
}

function drupal_add_css($path = NULL, $type = 'module', $media = 'all', $preprocess = TRUE) {
  static $css = array();
  global $language;

  // Create an array of CSS files for each media type first, since each type needs to be served
  // to the browser differently.
  if (isset($path)) {
    // This check is necessary to ensure proper cascading of styles and is faster than an asort().
    if (!isset($css[$media])) {
      $css[$media] = array('module' => array(), 'theme' => array());
    }
    $css[$media][$type][$path] = $preprocess;

    // If the current language is RTL, add the CSS file with RTL overrides.
    if (defined('LANGUAGE_RTL') && $language->direction == LANGUAGE_RTL) {
      $rtl_path = str_replace('.css', '-rtl.css', $path);
      if (file_exists($rtl_path)) {
        $css[$media][$type][$rtl_path] = $preprocess;
      }
    }
  }

  return $css;
}

function drupal_get_css($css = NULL) {
  $output = '';
  if (!isset($css)) {
    $css = drupal_add_css();
  }
  $no_module_preprocess = '';
  $no_theme_preprocess = '';

  $preprocess_css = (variable_get('preprocess_css', FALSE) && (!defined('MAINTENANCE_MODE') || MAINTENANCE_MODE != 'update'));
  $directory = file_directory_path();
  $is_writable = is_dir($directory) && is_writable($directory) && (variable_get('file_downloads', FILE_DOWNLOADS_PUBLIC) == FILE_DOWNLOADS_PUBLIC);

  // A dummy query-string is added to filenames, to gain control over
  // browser-caching. The string changes on every update or full cache
  // flush, forcing browsers to load a new copy of the files, as the
  // URL changed.
  $query_string = '?' . substr(variable_get('css_js_query_string', '0'), 0, 1);

  foreach ($css as $media => $types) {
    // If CSS preprocessing is off, we still need to output the styles.
    // Additionally, go through any remaining styles if CSS preprocessing is on and output the non-cached ones.
    foreach ($types as $type => $files) {
      if ($type == 'module') {
        // Setup theme overrides for module styles.
        $theme_styles = array();
        foreach (array_keys($css[$media]['theme']) as $theme_style) {
          $theme_styles[] = basename($theme_style);
        }
      }
      foreach ($types[$type] as $file => $preprocess) {
        // If the theme supplies its own style using the name of the module style, skip its inclusion.
        // This includes any RTL styles associated with its main LTR counterpart.
        if ($type == 'module' && in_array(str_replace('-rtl.css', '.css', basename($file)), $theme_styles)) {
          // Unset the file to prevent its inclusion when CSS aggregation is enabled.
          unset($types[$type][$file]);
          continue;
        }
        if (!$preprocess || !($is_writable && $preprocess_css)) {
          // If a CSS file is not to be preprocessed and it's a module CSS file, it needs to *always* appear at the *top*,
          // regardless of whether preprocessing is on or off.
          if (!$preprocess && $type == 'module') {
            $no_module_preprocess .= '<link type="text/css" rel="stylesheet" media="' . $media . '" href="' . base_path() . $file . $query_string . '" />' . "\n";
          }
          // If a CSS file is not to be preprocessed and it's a theme CSS file, it needs to *always* appear at the *bottom*,
          // regardless of whether preprocessing is on or off.
          else if (!$preprocess && $type == 'theme') {
            $no_theme_preprocess .= '<link type="text/css" rel="stylesheet" media="' . $media . '" href="' . base_path() . $file . $query_string . '" />' . "\n";
          }
          else {
            $output .= '<link type="text/css" rel="stylesheet" media="' . $media . '" href="' . base_path() . $file . $query_string . '" />' . "\n";
          }
        }
      }
    }

    if ($is_writable && $preprocess_css) {
      $filename = md5(serialize($types) . $query_string) . '.css';
      $preprocess_file = drupal_build_css_cache($types, $filename);
      $output .= '<link type="text/css" rel="stylesheet" media="' . $media . '" href="' . base_path() . $preprocess_file . '" />' . "\n";
    }
  }

  return $no_module_preprocess . $output . $no_theme_preprocess;
}

function drupal_build_css_cache($types, $filename) {
  $data = '';

  // Create the css/ within the files folder.
  $csspath = file_create_path('css');
  file_check_directory($csspath, FILE_CREATE_DIRECTORY);

  if (!file_exists($csspath . '/' . $filename)) {
    // Build aggregate CSS file.
    foreach ($types as $type) {
      foreach ($type as $file => $cache) {
        if ($cache) {
          $contents = drupal_load_stylesheet($file, TRUE);
          // Return the path to where this CSS file originated from.
          $base = base_path() . dirname($file) . '/';
          _drupal_build_css_path(NULL, $base);
          // Prefix all paths within this CSS file, ignoring external and absolute paths.
          $data .= preg_replace_callback('/url\([\'"]?(?![a-z]+:|\/+)([^\'")]+)[\'"]?\)/i', '_drupal_build_css_path', $contents);
        }
      }
    }

    // Per the W3C specification at http://www.w3.org/TR/REC-CSS2/cascade.html#at-import,
    // @import rules must proceed any other style, so we move those to the top.
    $regexp = '/@import[^;]+;/i';
    preg_match_all($regexp, $data, $matches);
    $data = preg_replace($regexp, '', $data);
    $data = implode('', $matches[0]) . $data;

    // Create the CSS file.
    file_save_data($data, $csspath . '/' . $filename, FILE_EXISTS_REPLACE);
  }
  return $csspath . '/' . $filename;
}

function _drupal_build_css_path($matches, $base = NULL) {
  static $_base;
  // Store base path for preg_replace_callback.
  if (isset($base)) {
    $_base = $base;
  }

  // Prefix with base and remove '../' segments where possible.
  $path = $_base . $matches[1];
  $last = '';
  while ($path != $last) {
    $last = $path;
    $path = preg_replace('`(^|/)(?!../)([^/]+)/../`', '$1', $path);
  }
  return 'url(' . $path . ')';
}

function drupal_load_stylesheet($file, $optimize = NULL) {
  static $_optimize;
  // Store optimization parameter for preg_replace_callback with nested @import loops.
  if (isset($optimize)) {
    $_optimize = $optimize;
  }

  $contents = '';
  if (file_exists($file)) {
    // Load the local CSS stylesheet.
    $contents = file_get_contents($file);

    // Change to the current stylesheet's directory.
    $cwd = getcwd();
    chdir(dirname($file));

    // Replaces @import commands with the actual stylesheet content.
    // This happens recursively but omits external files.
    $contents = preg_replace_callback('/@import\s*(?:url\()?[\'"]?(?![a-z]+:)([^\'"\()]+)[\'"]?\)?;/', '_drupal_load_stylesheet', $contents);
    // Remove multiple charset declarations for standards compliance (and fixing Safari problems).
    $contents = preg_replace('/^@charset\s+[\'"](\S*)\b[\'"];/i', '', $contents);

    if ($_optimize) {
      // Perform some safe CSS optimizations.
      $contents = preg_replace('<
        \s*([@{}:;,]|\)\s|\s\()\s* |  # Remove whitespace around separators, but keep space around parentheses.
        /\*([^*\\\\]|\*(?!/))+\*/ |   # Remove comments that are not CSS hacks.
        [\n\r]                        # Remove line breaks.
        >x', '\1', $contents);
    }

    // Change back directory.
    chdir($cwd);
  }

  return $contents;
}

function _drupal_load_stylesheet($matches) {
  $filename = $matches[1];
  // Load the imported stylesheet and replace @import commands in there as well.
  $file = drupal_load_stylesheet($filename);
  // Alter all url() paths, but not external.
  return preg_replace('/url\(([\'"]?)(?![a-z]+:)([^\'")]+)[\'"]?\)?;/i', 'url(\1' . dirname($filename) . '/', $file);
}

function drupal_clear_css_cache() {
  file_scan_directory(file_create_path('css'), '.*', array('.', '..', 'CVS'), 'file_delete', TRUE);
}

function drupal_add_js($data = NULL, $type = 'module', $scope = 'header', $defer = FALSE, $cache = TRUE, $preprocess = TRUE) {
  static $javascript = array();

  if (isset($data)) {

    // Add jquery.js and drupal.js, as well as the basePath setting, the
    // first time a Javascript file is added.
    if (empty($javascript)) {
      $javascript['header'] = array(
        'core' => array(
          'misc/jquery.js' => array('cache' => TRUE, 'defer' => FALSE, 'preprocess' => TRUE),
          'misc/drupal.js' => array('cache' => TRUE, 'defer' => FALSE, 'preprocess' => TRUE),
        ),
        'module' => array(),
        'theme' => array(),
        'setting' => array(
          array('basePath' => base_path()),
        ),
        'inline' => array(),
      );
    }

    if (isset($scope) && !isset($javascript[$scope])) {
      $javascript[$scope] = array('core' => array(), 'module' => array(), 'theme' => array(), 'setting' => array(), 'inline' => array());
    }

    if (isset($type) && isset($scope) && !isset($javascript[$scope][$type])) {
      $javascript[$scope][$type] = array();
    }

    switch ($type) {
      case 'setting':
        $javascript[$scope][$type][] = $data;
        break;
      case 'inline':
        $javascript[$scope][$type][] = array('code' => $data, 'defer' => $defer);
        break;
      default:
        // If cache is FALSE, don't preprocess the JS file.
        $javascript[$scope][$type][$data] = array('cache' => $cache, 'defer' => $defer, 'preprocess' => (!$cache ? FALSE : $preprocess));
    }
  }

  if (isset($scope)) {

    if (isset($javascript[$scope])) {
      return $javascript[$scope];
    }
    else {
      return array();
    }
  }
  else {
    return $javascript;
  }
}

function drupal_get_js($scope = 'header', $javascript = NULL) {
  if ((!defined('MAINTENANCE_MODE') || MAINTENANCE_MODE != 'update') && function_exists('locale_update_js_files')) {
    locale_update_js_files();
  }

  if (!isset($javascript)) {
    $javascript = drupal_add_js(NULL, NULL, $scope);
  }

  if (empty($javascript)) {
    return '';
  }

  $output = '';
  $preprocessed = '';
  $no_preprocess = array('core' => '', 'module' => '', 'theme' => '');
  $files = array();
  $preprocess_js = (variable_get('preprocess_js', FALSE) && (!defined('MAINTENANCE_MODE') || MAINTENANCE_MODE != 'update'));
  $directory = file_directory_path();
  $is_writable = is_dir($directory) && is_writable($directory) && (variable_get('file_downloads', FILE_DOWNLOADS_PUBLIC) == FILE_DOWNLOADS_PUBLIC);

  // A dummy query-string is added to filenames, to gain control over
  // browser-caching. The string changes on every update or full cache
  // flush, forcing browsers to load a new copy of the files, as the
  // URL changed. Files that should not be cached (see drupal_add_js())
  // get time() as query-string instead, to enforce reload on every
  // page request.
  $query_string = '?' . substr(variable_get('css_js_query_string', '0'), 0, 1);

  foreach ($javascript as $type => $data) {

    if (!$data) continue;

    switch ($type) {
      case 'setting':
        $output .= '<script type="text/javascript">jQuery.extend(Drupal.settings, ' . drupal_to_js(call_user_func_array('array_merge_recursive', $data)) . ");</script>\n";
        break;
      case 'inline':
        foreach ($data as $info) {
          $output .= '<script type="text/javascript"' . ($info['defer'] ? ' defer="defer"' : '') . '>' . $info['code'] . "</script>\n";
        }
        break;
      default:
        // If JS preprocessing is off, we still need to output the scripts.
        // Additionally, go through any remaining scripts if JS preprocessing is on and output the non-cached ones.
        foreach ($data as $path => $info) {
          if (!$info['preprocess'] || !$is_writable || !$preprocess_js) {
            $no_preprocess[$type] .= '<script type="text/javascript"' . ($info['defer'] ? ' defer="defer"' : '') . ' src="' . base_path() . $path . ($info['cache'] ? $query_string : '?' . time()) . "\"></script>\n";
          }
          else {
            $files[$path] = $info;
          }
        }
    }
  }

  // Aggregate any remaining JS files that haven't already been output.
  if ($is_writable && $preprocess_js && count($files) > 0) {
    $filename = md5(serialize($files) . $query_string) . '.js';
    $preprocess_file = drupal_build_js_cache($files, $filename);
    $preprocessed .= '<script type="text/javascript" src="' . base_path() . $preprocess_file . '"></script>' . "\n";
  }

  // Keep the order of JS files consistent as some are preprocessed and others are not.
  // Make sure any inline or JS setting variables appear last after libraries have loaded.
  $output = $preprocessed . implode('', $no_preprocess) . $output;

  return $output;
}

function drupal_add_tabledrag($table_id, $action, $relationship, $group, $subgroup = NULL, $source = NULL, $hidden = TRUE, $limit = 0) {
  static $js_added = FALSE;
  if (!$js_added) {
    drupal_add_js('misc/tabledrag.js', 'core');
    $js_added = TRUE;
  }

  // If a subgroup or source isn't set, assume it is the same as the group.
  $target = isset($subgroup) ? $subgroup : $group;
  $source = isset($source) ? $source : $target;
  $settings['tableDrag'][$table_id][$group][] = array(
    'target' => $target,
    'source' => $source,
    'relationship' => $relationship,
    'action' => $action,
    'hidden' => $hidden,
    'limit' => $limit,
  );
  drupal_add_js($settings, 'setting');
}

function drupal_build_js_cache($files, $filename) {
  $contents = '';

  // Create the js/ within the files folder.
  $jspath = file_create_path('js');
  file_check_directory($jspath, FILE_CREATE_DIRECTORY);

  if (!file_exists($jspath . '/' . $filename)) {
    // Build aggregate JS file.
    foreach ($files as $path => $info) {
      if ($info['preprocess']) {
        // Append a ';' after each JS file to prevent them from running together.
        $contents .= file_get_contents($path) . ';';
      }
    }

    // Create the JS file.
    file_save_data($contents, $jspath . '/' . $filename, FILE_EXISTS_REPLACE);
  }

  return $jspath . '/' . $filename;
}

function drupal_clear_js_cache() {
  file_scan_directory(file_create_path('js'), '.*', array('.', '..', 'CVS'), 'file_delete', TRUE);
  variable_set('javascript_parsed', array());
}

function drupal_to_js($var) {
  // json_encode() does not escape <, > and &, so we do it with str_replace()
  return str_replace(array("<", ">", "&"), array('\x3c', '\x3e', '\x26'), json_encode($var));
}

function drupal_json($var = NULL) {
  // We are returning JavaScript, so tell the browser.
  drupal_set_header('Content-Type: text/javascript; charset=utf-8');

  if (isset($var)) {
    echo drupal_to_js($var);
  }
}

function drupal_urlencode($text) {
  if (variable_get('clean_url', '0')) {
    return str_replace(array('%2F', '%26', '%23', '//'),
                       array('/', '%2526', '%2523', '/%252F'),
                       rawurlencode($text));
  }
  else {
    return str_replace('%2F', '/', rawurlencode($text));
  }
}

function drupal_random_bytes($count)  {
  static $random_state;
  // We initialize with the somewhat random PHP process ID on the first call.
  if (empty($random_state)) {
    $random_state = getmypid();
  }
  $output = '';
  // /dev/urandom is available on many *nix systems and is considered the best
  // commonly available pseudo-random source.
  if ($fh = @fopen('/dev/urandom', 'rb')) {
    $output = fread($fh, $count);
    fclose($fh);
  }
  // If /dev/urandom is not available or returns no bytes, this loop will
  // generate a good set of pseudo-random bytes on any system.
  // Note that it may be important that our $random_state is passed
  // through md5() prior to being rolled into $output, that the two md5()
  // invocations are different, and that the extra input into the first one -
  // the microtime() - is prepended rather than appended.  This is to avoid
  // directly leaking $random_state via the $output stream, which could
  // allow for trivial prediction of further "random" numbers.
  while (strlen($output) < $count) {
    $random_state = md5(microtime() . mt_rand() . $random_state);
    $output .= md5(mt_rand() . $random_state, TRUE);
  }
  return substr($output, 0, $count);
}

function drupal_get_private_key() {
  if (!($key = variable_get('drupal_private_key', 0))) {
    $key = md5(drupal_random_bytes(64));
    variable_set('drupal_private_key', $key);
  }
  return $key;
}

function drupal_get_token($value = '') {
  $private_key = drupal_get_private_key();
  return md5(session_id() . $value . $private_key);
}

function drupal_valid_token($token, $value = '', $skip_anonymous = FALSE) {
  global $user;
  return (($skip_anonymous && $user->uid == 0) || ($token == md5(session_id() . $value . variable_get('drupal_private_key', ''))));
}

function xmlrpc(a>) {
  require_once './includes/xmlrpc.inc';
  $args = func_get_args();
  return call_user_func_array('_xmlrpc', $args);
}

function _drupal_bootstrap_full() {
  static $called;

  if ($called) {
    return;
  }
  $called = 1;
  require_once './includes/theme.inc';
  require_once './includes/pager.inc';
  require_once './includes/menu.inc';
  require_once './includes/tablesort.inc';
  require_once './includes/file.inc';
  require_once './includes/unicode.inc';
  require_once './includes/image.inc';
  require_once './includes/form.inc';
  require_once './includes/mail.inc';
  require_once './includes/actions.inc';
  // Set the Drupal custom error handler.
  set_error_handler('drupal_error_handler');
  // Emit the correct charset HTTP header.
  drupal_set_header('Content-Type: text/html; charset=utf-8');
  // Detect string handling method
  unicode_check();
  // Undo magic quotes
  fix_gpc_magic();
  // Load all enabled modules
  module_load_all();
  // Let all modules take action before menu system handles the request
  // We do not want this while running update.php.
  if (!defined('MAINTENANCE_MODE') || MAINTENANCE_MODE != 'update') {
    module_invoke_all('init');
  }
}

function page_set_cache() {
  global $user, $base_root;

  if (!$user->uid && $_SERVER['REQUEST_METHOD'] == 'GET' && count(drupal_get_messages(NULL, FALSE)) == 0) {
    // This will fail in some cases, see page_get_cache() for the explanation.
    if ($data = ob_get_contents()) {
      $cache = TRUE;
      if (variable_get('page_compression', TRUE) && function_exists('gzencode')) {
        // We do not store the data in case the zlib mode is deflate.
        // This should be rarely happening.
        if (zlib_get_coding_type() == 'deflate') {
          $cache = FALSE;
        }
        else if (zlib_get_coding_type() == FALSE) {
          $data = gzencode($data, 9, FORCE_GZIP);
        }
        // The remaining case is 'gzip' which means the data is
        // already compressed and nothing left to do but to store it.
      }
      ob_end_flush();
      if ($cache && $data) {
        cache_set($base_root . request_uri(), $data, 'cache_page', CACHE_TEMPORARY, drupal_get_headers());
      }
    }
  }
}

function drupal_cron_run() {
  // Allow execution to continue even if the request gets canceled.
  @ignore_user_abort(TRUE);

  // Increase the maximum execution time.
  @set_time_limit(240);

  // Fetch the cron semaphore
  $semaphore = variable_get('cron_semaphore', FALSE);

  if ($semaphore) {
    if (time() - $semaphore > 3600) {
      // Either cron has been running for more than an hour or the semaphore
      // was not reset due to a database error.
      watchdog('cron', 'Cron has been running for more than an hour and is most likely stuck.', array(), WATCHDOG_ERROR);

      // Release cron semaphore
      variable_del('cron_semaphore');
    }
    else {
      // Cron is still running normally.
      watchdog('cron', 'Attempting to re-run cron while it is already running.', array(), WATCHDOG_WARNING);
    }
  }
  else {
    // Register shutdown callback
    register_shutdown_function('drupal_cron_cleanup');

    // Lock cron semaphore
    variable_set('cron_semaphore', time());

    // Iterate through the modules calling their cron handlers (if any):
    module_invoke_all('cron');

    // Record cron time
    variable_set('cron_last', time());
    watchdog('cron', 'Cron run completed.', array(), WATCHDOG_NOTICE);

    // Release cron semaphore
    variable_del('cron_semaphore');

    // Return TRUE so other functions can check if it did run successfully
    return TRUE;
  }
}

function drupal_cron_cleanup() {
  // See if the semaphore is still locked.
  if (variable_get('cron_semaphore', FALSE)) {
    watchdog('cron', 'Cron run exceeded the time limit and was aborted.', array(), WATCHDOG_WARNING);

    // Release cron semaphore
    variable_del('cron_semaphore');
  }
}

function drupal_system_listing($mask, $directory, $key = 'name', $min_depth = 1) {
  global $profile;
  $config = conf_path();

  // When this function is called during Drupal's initial installation process,
  // the name of the profile that's about to be installed is stored in the global
  // $profile variable. At all other times, the standard Drupal systems variable
  // table contains the name of the current profile, and we can call variable_get()
  // to determine what one is active.
  if (!isset($profile)) {
    $profile = variable_get('install_profile', 'default');
  }
  $searchdir = array($directory);
  $files = array();

  // Always search sites/all/* as well as the global directories
  $searchdir[] = 'sites/all/' . $directory;

  // The 'profiles' directory contains pristine collections of modules and
  // themes as organized by a distribution.  It is pristine in the same way
  // that /modules is pristine for core; users should avoid changing anything
  // there in favor of sites/all or sites/<domain> directories.
  if (file_exists("profiles/$profile/$directory")) {
    $searchdir[] = "profiles/$profile/$directory";
  }

  if (file_exists("$config/$directory")) {
    $searchdir[] = "$config/$directory";
  }

  // Get current list of items
  foreach ($searchdir as $dir) {
    $files = array_merge($files, file_scan_directory($dir, $mask, array('.', '..', 'CVS'), 0, TRUE, $key, $min_depth));
  }

  return $files;
}


function drupal_alter($type, &$data) {
  // PHP's func_get_args() always returns copies of params, not references, so
  // drupal_alter() can only manipulate data that comes in via the required first
  // param. For the edge case functions that must pass in an arbitrary number of
  // alterable parameters (hook_form_alter() being the best example), an array of
  // those params can be placed in the __drupal_alter_by_ref key of the $data
  // array. This is somewhat ugly, but is an unavoidable consequence of a flexible
  // drupal_alter() function, and the limitations of func_get_args().
  // @todo: Remove this in Drupal 7.
  if (is_array($data) && isset($data['__drupal_alter_by_ref'])) {
    $by_ref_parameters = $data['__drupal_alter_by_ref'];
    unset($data['__drupal_alter_by_ref']);
  }

  // Hang onto a reference to the data array so that it isn't blown away later.
  // Also, merge in any parameters that need to be passed by reference.
  $args = array(&$data);
  if (isset($by_ref_parameters)) {
    $args = array_merge($args, $by_ref_parameters);
  }

  // Now, use func_get_args() to pull in any additional parameters passed into
  // the drupal_alter() call.
  $additional_args = func_get_args();
  array_shift($additional_args);
  array_shift($additional_args);
  $args = array_merge($args, $additional_args);

  foreach (module_implements($type . '_alter') as $module) {
    $function = $module . '_' . $type . '_alter';
    call_user_func_array($function, $args);
  }
}


function drupal_render(&$elements) {
  if (!isset($elements) || (isset($elements['#access']) && !$elements['#access'])) {
    return NULL;
  }

  // If the default values for this element haven't been loaded yet, populate
  // them.
  if (!isset($elements['#defaults_loaded']) || !$elements['#defaults_loaded']) {
    if ((!empty($elements['#type'])) && ($info = _element_info($elements['#type']))) {
      $elements += $info;
    }
  }

  // Make any final changes to the element before it is rendered. This means
  // that the $element or the children can be altered or corrected before the
  // element is rendered into the final text.
  if (isset($elements['#pre_render'])) {
    foreach ($elements['#pre_render'] as $function) {
      if (drupal_function_exists($function)) {
        $elements = $function($elements);
      }
    }
  }

  $content = '';
  // Either the elements did not go through form_builder or one of the children
  // has a #weight.
  if (!isset($elements['#sorted'])) {
    uasort($elements, "element_sort");
  }
  $elements += array('#title' => NULL, '#description' => NULL);
  if (!isset($elements['#children'])) {
    $children = element_children($elements);
    /* Render all the children that use a theme function */
    if (isset($elements['#theme']) && empty($elements['#theme_used'])) {
      $elements['#theme_used'] = TRUE;

      $previous = array();
      foreach (array('#value', '#type', '#prefix', '#suffix') as $key) {
        $previous[$key] = isset($elements[$key]) ? $elements[$key] : NULL;
      }
      // If we rendered a single element, then we will skip the renderer.
      if (empty($children)) {
        $elements['#printed'] = TRUE;
      }
      else {
        $elements['#value'] = '';
      }
      $elements['#type'] = 'markup';

      unset($elements['#prefix'], $elements['#suffix']);
      $content = theme($elements['#theme'], $elements);

      foreach (array('#value', '#type', '#prefix', '#suffix') as $key) {
        $elements[$key] = isset($previous[$key]) ? $previous[$key] : NULL;
      }
    }
    /* render each of the children using drupal_render and concatenate them */
    if (!isset($content) || $content === '') {
      foreach ($children as $key) {
        $content .= drupal_render($elements[$key]);
      }
    }
  }
  if (isset($content) && $content !== '') {
    $elements['#children'] = $content;
  }

  // Until now, we rendered the children, here we render the element itself
  if (!isset($elements['#printed'])) {
    $content = theme(!empty($elements['#type']) ? $elements['#type'] : 'markup', $elements);
    $elements['#printed'] = TRUE;
  }

  if (isset($content) && $content !== '') {
    // Filter the outputted content and make any last changes before the
    // content is sent to the browser. The changes are made on $content
    // which allows the output'ed text to be filtered.
    if (isset($elements['#post_render'])) {
      foreach ($elements['#post_render'] as $function) {
        if (drupal_function_exists($function)) {
          $content = $function($content, $elements);
        }
      }
    }
    $prefix = isset($elements['#prefix']) ? $elements['#prefix'] : '';
    $suffix = isset($elements['#suffix']) ? $elements['#suffix'] : '';
    return $prefix . $content . $suffix;
  }
}

function element_sort($a, $b) {
  $a_weight = (is_array($a) && isset($a['#weight'])) ? $a['#weight'] : 0;
  $b_weight = (is_array($b) && isset($b['#weight'])) ? $b['#weight'] : 0;
  if ($a_weight == $b_weight) {
    return 0;
  }
  return ($a_weight < $b_weight) ? -1 : 1;
}

function element_property($key) {
  return $key[0] == '#';
}

function element_properties($element) {
  return array_filter(array_keys((array) $element), 'element_property');
}

function element_child($key) {
  return !isset($key[0]) || $key[0] != '#';
}

function element_children($element) {
  return array_filter(array_keys((array) $element), 'element_child');
}

function drupal_common_theme() {
  return array(
    // theme.inc
    'placeholder' => array(
      'arguments' => array('text' => NULL)
    ),
    'page' => array(
      'arguments' => array('content' => NULL, 'show_blocks' => TRUE, 'show_messages' => TRUE),
      'template' => 'page',
    ),
    'maintenance_page' => array(
      'arguments' => array('content' => NULL, 'show_blocks' => TRUE, 'show_messages' => TRUE),
      'template' => 'maintenance-page',
    ),
    'update_page' => array(
      'arguments' => array('content' => NULL, 'show_messages' => TRUE),
    ),
    'install_page' => array(
      'arguments' => array('content' => NULL),
    ),
    'task_list' => array(
      'arguments' => array('items' => NULL, 'active' => NULL),
    ),
    'status_messages' => array(
      'arguments' => array('display' => NULL),
    ),
    'links' => array(
      'arguments' => array('links' => NULL, 'attributes' => array('class' => 'links')),
    ),
    'image' => array(
      'arguments' => array('path' => NULL, 'alt' => '', 'title' => '', 'attributes' => NULL, 'getsize' => TRUE),
    ),
    'breadcrumb' => array(
      'arguments' => array('breadcrumb' => NULL),
    ),
    'help' => array(
      'arguments' => array(),
    ),
    'submenu' => array(
      'arguments' => array('links' => NULL),
    ),
    'table' => array(
      'arguments' => array('header' => NULL, 'rows' => NULL, 'attributes' => array(), 'caption' => NULL),
    ),
    'table_select_header_cell' => array(
      'arguments' => array(),
    ),
    'tablesort_indicator' => array(
      'arguments' => array('style' => NULL),
    ),
    'box' => array(
      'arguments' => array('title' => NULL, 'content' => NULL, 'region' => 'main'),
      'template' => 'box',
    ),
    'block' => array(
      'arguments' => array('block' => NULL),
      'template' => 'block',
    ),
    'mark' => array(
      'arguments' => array('type' => MARK_NEW),
    ),
    'item_list' => array(
      'arguments' => array('items' => array(), 'title' => NULL, 'type' => 'ul', 'attributes' => NULL),
    ),
    'more_help_link' => array(
      'arguments' => array('url' => NULL),
    ),
    'xml_icon' => array(
      'arguments' => array('url' => NULL),
    ),
    'feed_icon' => array(
      'arguments' => array('url' => NULL, 'title' => NULL),
    ),
    'more_link' => array(
      'arguments' => array('url' => NULL, 'title' => NULL)
    ),
    'closure' => array(
      'arguments' => array('main' => 0),
    ),
    'blocks' => array(
      'arguments' => array('region' => NULL),
    ),
    'username' => array(
      'arguments' => array('object' => NULL),
    ),
    'progress_bar' => array(
      'arguments' => array('percent' => NULL, 'message' => NULL),
    ),
    'indentation' => array(
      'arguments' => array('size' => 1),
    ),
    // from pager.inc
    'pager' => array(
      'arguments' => array('tags' => array(), 'limit' => 10, 'element' => 0, 'parameters' => array()),
    ),
    'pager_first' => array(
      'arguments' => array('text' => NULL, 'limit' => NULL, 'element' => 0, 'parameters' => array()),
    ),
    'pager_previous' => array(
      'arguments' => array('text' => NULL, 'limit' => NULL, 'element' => 0, 'interval' => 1, 'parameters' => array()),
    ),
    'pager_next' => array(
      'arguments' => array('text' => NULL, 'limit' => NULL, 'element' => 0, 'interval' => 1, 'parameters' => array()),
    ),
    'pager_last' => array(
      'arguments' => array('text' => NULL, 'limit' => NULL, 'element' => 0, 'parameters' => array()),
    ),
    'pager_link' => array(
      'arguments' => array('text' => NULL, 'page_new' => NULL, 'element' => NULL, 'parameters' => array(), 'attributes' => array()),
    ),
    // from locale.inc
    'locale_admin_manage_screen' => array(
      'arguments' => array('form' => NULL),
    ),
    // from menu.inc
    'menu_item_link' => array(
      'arguments' => array('item' => NULL),
    ),
    'menu_tree' => array(
      'arguments' => array('tree' => NULL),
    ),
    'menu_item' => array(
      'arguments' => array('link' => NULL, 'has_children' => NULL, 'menu' => ''),
    ),
    'menu_local_task' => array(
      'arguments' => array('link' => NULL, 'active' => FALSE),
    ),
    'menu_local_tasks' => array(
      'arguments' => array(),
    ),
    // from form.inc
    'select' => array(
      'arguments' => array('element' => NULL),
    ),
    'fieldset' => array(
      'arguments' => array('element' => NULL),
    ),
    'radio' => array(
      'arguments' => array('element' => NULL),
    ),
    'radios' => array(
      'arguments' => array('element' => NULL),
    ),
    'password_confirm' => array(
      'arguments' => array('element' => NULL),
    ),
    'date' => array(
      'arguments' => array('element' => NULL),
    ),
    'item' => array(
      'arguments' => array('element' => NULL),
    ),
    'checkbox' => array(
      'arguments' => array('element' => NULL),
    ),
    'checkboxes' => array(
      'arguments' => array('element' => NULL),
    ),
    'submit' => array(
      'arguments' => array('element' => NULL),
    ),
    'button' => array(
      'arguments' => array('element' => NULL),
    ),
    'image_button' => array(
      'arguments' => array('element' => NULL),
    ),
    'hidden' => array(
      'arguments' => array('element' => NULL),
    ),
    'token' => array(
      'arguments' => array('element' => NULL),
    ),
    'textfield' => array(
      'arguments' => array('element' => NULL),
    ),
    'form' => array(
      'arguments' => array('element' => NULL),
    ),
    'textarea' => array(
      'arguments' => array('element' => NULL),
    ),
    'markup' => array(
      'arguments' => array('element' => NULL),
    ),
    'password' => array(
      'arguments' => array('element' => NULL),
    ),
    'file' => array(
      'arguments' => array('element' => NULL),
    ),
    'form_element' => array(
      'arguments' => array('element' => NULL, 'value' => NULL),
    ),
  );
}

function drupal_get_schema($table = NULL, $rebuild = FALSE) {
  static $schema = array();

  if (empty($schema) || $rebuild) {
    // Try to load the schema from cache.
    if (!$rebuild && $cached = cache_get('schema')) {
      $schema = $cached->data;
    }
    // Otherwise, rebuild the schema cache.
    else {
      $schema = array();
      // Load the .install files to get hook_schema.
      module_load_all_includes('install');

      // Invoke hook_schema for all modules.
      foreach (module_implements('schema') as $module) {
        $current = module_invoke($module, 'schema');
        _drupal_initialize_schema($module, $current);
        $schema = array_merge($schema, $current);
      }

      drupal_alter('schema', $schema);
      cache_set('schema', $schema);
    }
  }

  if (!isset($table)) {
    return $schema;
  }
  elseif (isset($schema[$table])) {
    return $schema[$table];
  }
  else {
    return FALSE;
  }
}

function drupal_install_schema($module) {
  $schema = drupal_get_schema_unprocessed($module);
  _drupal_initialize_schema($module, $schema);

  $ret = array();
  foreach ($schema as $name => $table) {
    db_create_table($ret, $name, $table);
  }
  return $ret;
}

function drupal_uninstall_schema($module) {
  $schema = drupal_get_schema_unprocessed($module);
  _drupal_initialize_schema($module, $schema);

  $ret = array();
  foreach ($schema as $table) {
    db_drop_table($ret, $table['name']);
  }
  return $ret;
}

function drupal_get_schema_unprocessed($module, $table = NULL) {
  // Load the .install file to get hook_schema.
  module_load_install($module);
  $schema = module_invoke($module, 'schema');

  if (!is_null($table) && isset($schema[$table])) {
    return $schema[$table];
  }
  else {
    return $schema;
  }
}

function _drupal_initialize_schema($module, &$schema) {
  // Set the name and module key for all tables.
  foreach ($schema as $name => $table) {
    if (empty($table['module'])) {
      $schema[$name]['module'] = $module;
    }
    if (!isset($table['name'])) {
      $schema[$name]['name'] = $name;
    }
  }
}

function drupal_schema_fields_sql($table, $prefix = NULL) {
  $schema = drupal_get_schema($table);
  $fields = array_keys($schema['fields']);
  if ($prefix) {
    $columns = array();
    foreach ($fields as $field) {
      $columns[] = "$prefix.$field";
    }
    return $columns;
  }
  else {
    return $fields;
  }
}

function drupal_write_record($table, &$object, $update = array()) {
  // Standardize $update to an array.
  if (is_string($update)) {
    $update = array($update);
  }

  $schema = drupal_get_schema($table);
  if (empty($schema)) {
    return FALSE;
  }

  // Convert to an object if needed.
  if (is_array($object)) {
    $object = (object) $object;
    $array = TRUE;
  }
  else {
    $array = FALSE;
  }

  $fields = $defs = $values = $serials = $placeholders = array();

  // Go through our schema, build SQL, and when inserting, fill in defaults for
  // fields that are not set.
  foreach ($schema['fields'] as $field => $info) {
    // Special case -- skip serial types if we are updating.
    if ($info['type'] == 'serial' && count($update)) {
      continue;
    }

    // For inserts, populate defaults from Schema if not already provided
    if (!isset($object->$field) && !count($update) && isset($info['default'])) {
      $object->$field = $info['default'];
    }

    // Track serial fields so we can helpfully populate them after the query.
    if ($info['type'] == 'serial') {
      $serials[] = $field;
      // Ignore values for serials when inserting data. Unsupported.
      unset($object->$field);
    }

    // Build arrays for the fields, placeholders, and values in our query.
    if (isset($object->$field)) {
      $fields[] = $field;
      $placeholders[] = db_type_placeholder($info['type']);

      if (empty($info['serialize'])) {
        $values[] = $object->$field;
      }
      elseif (!empty($object->$field)) {
        $values[] = serialize($object->$field);
      }
      else {
        $values[] = '';
      }
    }
  }

  if (empty($fields)) {
    // No changes requested.
    // If we began with an array, convert back so we don't surprise the caller.
    if ($array) {
      $object = (array)$object;
    }
    return;
  }

  // Build the SQL.
  $query = '';
  if (!count($update)) {
    $query = "INSERT INTO {" . $table . "} (" . implode(', ', $fields) . ') VALUES (' . implode(', ', $placeholders) . ')';
    $return = SAVED_NEW;
  }
  else {
    $query = '';
    foreach ($fields as $id => $field) {
      if ($query) {
        $query .= ', ';
      }
      $query .= $field . ' = ' . $placeholders[$id];
    }

    foreach ($update as $key){
      $conditions[] = "$key = " . db_type_placeholder($schema['fields'][$key]['type']);
      $values[] = $object->$key;
    }

    $query = "UPDATE {" . $table . "} SET $query WHERE " . implode(' AND ', $conditions);
    $return = SAVED_UPDATED;
  }

  // Execute the SQL.
  if (db_query($query, $values)) {
    if ($serials) {
      // Get last insert ids and fill them in.
      foreach ($serials as $field) {
        $object->$field = db_last_insert_id($table, $field);
      }
    }
  }
  else {
    $return = FALSE;
  }

  // If we began with an array, convert back so we don't surprise the caller.
  if ($array) {
    $object = (array) $object;
  }

  return $return;
}

function drupal_parse_info_file($filename) {
  $info = array();

  if (!file_exists($filename)) {
    return $info;
  }

  $data = file_get_contents($filename);
  if (preg_match_all('
    @^\s*                           # Start at the beginning of a line, ignoring leading whitespace
    ((?:
      [^=;\[\]]|                    # Key names cannot contain equal signs, semi-colons or square brackets,
      \[[^\[\]]*\]                  # unless they are balanced and not nested
    )+?)
    \s*=\s*                         # Key/value pairs are separated by equal signs (ignoring white-space)
    (?:
      ("(?:[^"]|(?<=\\\\)")*")|     # Double-quoted string, which may contain slash-escaped quotes/slashes
      (\'(?:[^\']|(?<=\\\\)\')*\')| # Single-quoted string, which may contain slash-escaped quotes/slashes
      ([^\r\n]*?)                   # Non-quoted string
    )\s*$                           # Stop at the next end of a line, ignoring trailing whitespace
    @msx', $data, $matches, PREG_SET_ORDER)) {
    foreach ($matches as $match) {
      // Fetch the key and value string
      $i = 0;
      foreach (array('key', 'value1', 'value2', 'value3') as $var) {
        $$var = isset($match[++$i]) ? $match[$i] : '';
      }
      $value = stripslashes(substr($value1, 1, -1)) . stripslashes(substr($value2, 1, -1)) . $value3;

      // Parse array syntax
      $keys = preg_split('/\]?\[/', rtrim($key, ']'));
      $last = array_pop($keys);
      $parent = &$info;

      // Create nested arrays
      foreach ($keys as $key) {
        if ($key == '') {
          $key = count($parent);
        }
        if (!isset($parent[$key]) || !is_array($parent[$key])) {
          $parent[$key] = array();
        }
        $parent = &$parent[$key];
      }

      // Handle PHP constants
      if (defined($value)) {
        $value = constant($value);
      }

      // Insert actual value
      if ($last == '') {
        $last = count($parent);
      }
      $parent[$last] = $value;
    }
  }

  return $info;
}

function watchdog_severity_levels() {
  return array(
    WATCHDOG_EMERG    => t('emergency'),
    WATCHDOG_ALERT    => t('alert'),
    WATCHDOG_CRITICAL => t('critical'),
    WATCHDOG_ERROR    => t('error'),
    WATCHDOG_WARNING  => t('warning'),
    WATCHDOG_NOTICE   => t('notice'),
    WATCHDOG_INFO     => t('info'),
    WATCHDOG_DEBUG    => t('debug'),
  );
}


function drupal_explode_tags($tags) {
  // This regexp allows the following types of user input:
  // this, "somecompany, llc", "and ""this"" w,o.rks", foo bar
  $regexp = '%(?:^|,\ *)("(?>[^"]*)(?>""[^"]* )*"|(?: [^",]*))%x';
  preg_match_all($regexp, $tags, $matches);
  $typed_tags = array_unique($matches[1]);

  $tags = array();
  foreach ($typed_tags as $tag) {
    // If a user has escaped a term (to demonstrate that it is a group,
    // or includes a comma or quote character), we remove the escape
    // formatting so to save the term into the database as the user intends.
    $tag = trim(str_replace('""', '"', preg_replace('/^"(.*)"$/', '\1', $tag)));
    if ($tag != "") {
      $tags[] = $tag;
    }
  }

  return $tags;
}

function drupal_implode_tags($tags) {
  $encoded_tags = array();
  foreach ($tags as $tag) {
    // Commas and quotes in tag names are special cases, so encode them.
    if (strpos($tag, ',') !== FALSE || strpos($tag, '"') !== FALSE) {
      $tag = '"' . str_replace('"', '""', $tag) . '"';
    }

    $encoded_tags[] = $tag;
  }
  return implode(', ', $encoded_tags);
}

function drupal_flush_all_caches() {
  // Change query-strings on css/js files to enforce reload for all users.
  _drupal_flush_css_js();

  drupal_rebuild_code_registry();
  drupal_clear_css_cache();
  drupal_clear_js_cache();
  system_theme_data();
  drupal_rebuild_theme_registry();
  menu_rebuild();
  node_types_rebuild();
  // Don't clear cache_form - in-progress form submissions may break.
  // Ordered so clearing the page cache will always be the last action.
  $core = array('cache', 'cache_block', 'cache_filter', 'cache_registry', 'cache_page');
  $cache_tables = array_merge(module_invoke_all('flush_caches'), $core);
  foreach ($cache_tables as $table) {
    cache_clear_all('*', $table, TRUE);
  }
}

function _drupal_flush_css_js() {
  $string_history = variable_get('css_js_query_string', '00000000000000000000');
  $new_character = $string_history[0];
  $characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
  while (strpos($string_history, $new_character) !== FALSE) {
    $new_character = $characters[mt_rand(0, strlen($characters) - 1)];
  }
  variable_set('css_js_query_string', $new_character . substr($string_history, 0, 19));
}

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