<?php

function update_update_page() {
  // Set the installed version so updates start at the correct place.
  // Ensure system.module's updates are run first by making it the first element.
  $_SESSION['update_remaining'] = array('system' => '');
  foreach ($_POST['edit']['start'] as $module => $version) {
    drupal_set_installed_schema_version($module, $version - 1);
    $max_version = max(drupal_get_schema_versions($module));
    if ($version <= $max_version) {
      foreach (range($version, $max_version) as $update) {
        $_SESSION['update_remaining'][$module] = array('module' => $module, 'version' => $update);
      }
    }
  }
  // Keep track of total number of updates
  $_SESSION['update_total'] = count($_SESSION['update_remaining']);

  if ($_POST['edit']['has_js']) {
    return update_progress_page();
  }
  else {
    return update_progress_page_nojs();
  }
}