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<?php
/***********************************************************************

  Copyright (C) 2002-2005  Rickard Andersson (rickard@punbb.org)

  This file is part of PunBB.

  PunBB is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published
  by the Free Software Foundation; either version 2 of the License,
  or (at your option) any later version.

  PunBB is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  MA  02111-1307  USA

************************************************************************/

//
// Cookie stuff!
//
function check_cookie(&$pun_user)
{
    global $db, $pun_config, $cookie_name, $cookie_seed;

    $now = time();
    $expire = $now + 31536000;    // The cookie expires after a year

    // We assume it's a guest
    $cookie = array('user_id' => 1, 'password_hash' => 'Guest');

    // If a cookie is set, we get the user_id and password hash from it
    if (isset($_COOKIE[$cookie_name]))
        list($cookie['user_id'], $cookie['password_hash']) = @unserialize($_COOKIE[$cookie_name]);

    if ($cookie['user_id'] > 1)
    {
        // Check if there's a user with the user ID and password hash from the cookie
        $result = $db->query('SELECT u.*, g.*, o.logged, o.idle FROM '.$db->prefix.'users AS u INNER JOIN '.$db->prefix.'groups AS g ON u.group_id=g.g_id LEFT JOIN '.$db->prefix.'online AS o ON o.user_id=u.id WHERE u.id='.intval($cookie['user_id'])) or error('Unable to fetch user information', __FILE__, __LINE__, $db->error());
        $pun_user = $db->fetch_assoc($result);

        // If user authorisation failed
        if (!isset($pun_user['id']) || md5($cookie_seed.$pun_user['password']) !== $cookie['password_hash'])
        {
            pun_setcookie(0, random_pass(8), $expire);
            set_default_user();

            return;
        }

        // Set a default language if the user selected language no longer exists
        if (!@file_exists(PUN_ROOT.'lang/'.$pun_user['language']))
            $pun_user['language'] = $pun_config['o_default_lang'];

        // Set a default style if the user selected style no longer exists
        if (!@file_exists(PUN_ROOT.'style/'.$pun_user['style'].'.css'))
            $pun_user['style'] = $pun_config['o_default_style'];

        if (!$pun_user['disp_topics'])
            $pun_user['disp_topics'] = $pun_config['o_disp_topics_default'];
        if (!$pun_user['disp_posts'])
            $pun_user['disp_posts'] = $pun_config['o_disp_posts_default'];

        if ($pun_user['save_pass'] == '0')
            $expire = 0;

        // Define this if you want this visit to affect the online list and the users last visit data
        if (!defined('PUN_QUIET_VISIT'))
        {
            // Update the online list
            if (!$pun_user['logged'])
                $db->query('INSERT INTO '.$db->prefix.'online (user_id, ident, logged) VALUES('.$pun_user['id'].', \''.$db->escape($pun_user['username']).'\', '.$now.')') or error('Unable to insert into online list', __FILE__, __LINE__, $db->error());
            else
            {
                // Special case: We've timed out, but no other user has browsed the forums since we timed out
                if ($pun_user['logged'] < ($now-$pun_config['o_timeout_visit']))
                {
                    $db->query('UPDATE '.$db->prefix.'users SET last_visit='.$pun_user['logged'].' WHERE id='.$pun_user['id']) or error('Unable to update user visit data', __FILE__, __LINE__, $db->error());
                    $pun_user['last_visit'] = $pun_user['logged'];
                }

                $idle_sql = ($pun_user['idle'] == '1') ? ', idle=0' : '';
                $db->query('UPDATE '.$db->prefix.'online SET logged='.$now.$idle_sql.' WHERE user_id='.$pun_user['id']) or error('Unable to update online list', __FILE__, __LINE__, $db->error());
            }
        }

        $pun_user['is_guest'] = false;
    }
    else
        set_default_user();
}


//
// Fill $pun_user with default values (for guests)
//
function set_default_user()
{
    global $db, $pun_user, $pun_config;

    $remote_addr = get_remote_address();

    // Fetch guest user
    $result = $db->query('SELECT u.*, g.*, o.logged FROM '.$db->prefix.'users AS u INNER JOIN '.$db->prefix.'groups AS g ON u.group_id=g.g_id LEFT JOIN '.$db->prefix.'online AS o ON o.ident=\''.$remote_addr.'\' WHERE u.id=1') or error('Unable to fetch guest information', __FILE__, __LINE__, $db->error());
    if (!$db->num_rows($result))
        exit('Unable to fetch guest information. The table \''.$db->prefix.'users\' must contain an entry with id = 1 that represents anonymous users.');

    $pun_user = $db->fetch_assoc($result);

    // Update online list
    if (!$pun_user['logged'])
        $db->query('INSERT INTO '.$db->prefix.'online (user_id, ident, logged) VALUES(1, \''.$db->escape($remote_addr).'\', '.time().')') or error('Unable to insert into online list', __FILE__, __LINE__, $db->error());
    else
        $db->query('UPDATE '.$db->prefix.'online SET logged='.time().' WHERE ident=\''.$db->escape($remote_addr).'\'') or error('Unable to update online list', __FILE__, __LINE__, $db->error());

    $pun_user['disp_topics'] = $pun_config['o_disp_topics_default'];
    $pun_user['disp_posts'] = $pun_config['o_disp_posts_default'];
    $pun_user['timezone'] = $pun_config['o_server_timezone'];
    $pun_user['language'] = $pun_config['o_default_lang'];
    $pun_user['style'] = $pun_config['o_default_style'];
    $pun_user['is_guest'] = true;
}


//
// Set a cookie, PunBB style!
//
function pun_setcookie($user_id, $password_hash, $expire)
{
    global $cookie_name, $cookie_path, $cookie_domain, $cookie_secure, $cookie_seed;

    // Enable sending of a P3P header by removing // from the following line (try this if login is failing in IE6)
//    @header('P3P: CP="CUR ADM"');

    if (version_compare(PHP_VERSION, '5.2.0', '>='))
        setcookie($cookie_name, serialize(array($user_id, md5($cookie_seed.$password_hash))), $expire, $cookie_path, $cookie_domain, $cookie_secure, true);
    else
        setcookie($cookie_name, serialize(array($user_id, md5($cookie_seed.$password_hash))), $expire, $cookie_path.'; HttpOnly', $cookie_domain, $cookie_secure);
}


//
// Check whether the connecting user is banned (and delete any expired bans while we're at it)
//
function check_bans()
{
    global $db, $pun_config, $lang_common, $pun_user, $pun_bans;

    // Admins aren't affected
    if ($pun_user['g_id'] == PUN_ADMIN || !$pun_bans)
        return;

    // Add a dot at the end of the IP address to prevent banned address 192.168.0.5 from matching e.g. 192.168.0.50
    $user_ip = get_remote_address().'.';
    $bans_altered = false;

    foreach ($pun_bans as $cur_ban)
    {
        // Has this ban expired?
        if ($cur_ban['expire'] != '' && $cur_ban['expire'] <= time())
        {
            $db->query('DELETE FROM '.$db->prefix.'bans WHERE id='.$cur_ban['id']) or error('Unable to delete expired ban', __FILE__, __LINE__, $db->error());
            $bans_altered = true;
            continue;
        }

        if ($cur_ban['username'] != '' && !strcasecmp($pun_user['username'], $cur_ban['username']))
        {
            $db->query('DELETE FROM '.$db->prefix.'online WHERE ident=\''.$db->escape($pun_user['username']).'\'') or error('Unable to delete from online list', __FILE__, __LINE__, $db->error());
            message($lang_common['Ban message'].' '.(($cur_ban['expire'] != '') ? $lang_common['Ban message 2'].' '.strtolower(format_time($cur_ban['expire'], true)).'. ' : '').(($cur_ban['message'] != '') ? $lang_common['Ban message 3'].'<br /><br /><strong>'.pun_htmlspecialchars($cur_ban['message']).'</strong><br /><br />' : '<br /><br />').$lang_common['Ban message 4'].' <a href="mailto:'.$pun_config['o_admin_email'].'">'.$pun_config['o_admin_email'].'</a>.', true);
        }

        if ($cur_ban['ip'] != '')
        {
            $cur_ban_ips = explode(' ', $cur_ban['ip']);

            for ($i = 0; $i < count($cur_ban_ips); ++$i)
            {
                $cur_ban_ips[$i] = $cur_ban_ips[$i].'.';

                if (substr($user_ip, 0, strlen($cur_ban_ips[$i])) == $cur_ban_ips[$i])
                {
                    $db->query('DELETE FROM '.$db->prefix.'online WHERE ident=\''.$db->escape($pun_user['username']).'\'') or error('Unable to delete from online list', __FILE__, __LINE__, $db->error());
                    message($lang_common['Ban message'].' '.(($cur_ban['expire'] != '') ? $lang_common['Ban message 2'].' '.strtolower(format_time($cur_ban['expire'], true)).'. ' : '').(($cur_ban['message'] != '') ? $lang_common['Ban message 3'].'<br /><br /><strong>'.pun_htmlspecialchars($cur_ban['message']).'</strong><br /><br />' : '<br /><br />').$lang_common['Ban message 4'].' <a href="mailto:'.$pun_config['o_admin_email'].'">'.$pun_config['o_admin_email'].'</a>.', true);
                }
            }
        }
    }

    // If we removed any expired bans during our run-through, we need to regenerate the bans cache
    if ($bans_altered)
    {
        require_once PUN_ROOT.'include/cache.php';
        generate_bans_cache();
    }
}


//
// Update "Users online"
//
function update_users_online()
{
    global $db, $pun_config, $pun_user;

    $now = time();

    // Fetch all online list entries that are older than "o_timeout_online"
    $result = $db->query('SELECT * FROM '.$db->prefix.'online WHERE logged<'.($now-$pun_config['o_timeout_online'])) or error('Unable to fetch old entries from online list', __FILE__, __LINE__, $db->error());
    while ($cur_user = $db->fetch_assoc($result))
    {
        // If the entry is a guest, delete it
        if ($cur_user['user_id'] == '1')
            $db->query('DELETE FROM '.$db->prefix.'online WHERE ident=\''.$db->escape($cur_user['ident']).'\'') or error('Unable to delete from online list', __FILE__, __LINE__, $db->error());
        else
        {
            // If the entry is older than "o_timeout_visit", update last_visit for the user in question, then delete him/her from the online list
            if ($cur_user['logged'] < ($now-$pun_config['o_timeout_visit']))
            {
                $db->query('UPDATE '.$db->prefix.'users SET last_visit='.$cur_user['logged'].' WHERE id='.$cur_user['user_id']) or error('Unable to update user visit data', __FILE__, __LINE__, $db->error());
                $db->query('DELETE FROM '.$db->prefix.'online WHERE user_id='.$cur_user['user_id']) or error('Unable to delete from online list', __FILE__, __LINE__, $db->error());
            }
            else if ($cur_user['idle'] == '0')
                $db->query('UPDATE '.$db->prefix.'online SET idle=1 WHERE user_id='.$cur_user['user_id']) or error('Unable to insert into online list', __FILE__, __LINE__, $db->error());
        }
    }
}


//
// Generate the "navigator" that appears at the top of every page
//
function generate_navlinks()
{
    global $pun_config, $lang_common, $pun_user;

    // Index and Userlist should always be displayed
    $links[] = '<li id="navindex"><a href="index.php">'.$lang_common['Index'].'</a>';
    $links[] = '<li id="navuserlist"><a href="userlist.php">'.$lang_common['User list'].'</a>';

    if ($pun_config['o_rules'] == '1')
        $links[] = '<li id="navrules"><a href="misc.php?action=rules">'.$lang_common['Rules'].'</a>';

    if ($pun_user['is_guest'])
    {
        if ($pun_user['g_search'] == '1')
            $links[] = '<li id="navsearch"><a href="search.php">'.$lang_common['Search'].'</a>';

        $links[] = '<li id="navregister"><a href="register.php">'.$lang_common['Register'].'</a>';
        $links[] = '<li id="navlogin"><a href="login.php">'.$lang_common['Login'].'</a>';

        $info = $lang_common['Not logged in'];
    }
    else
    {
        if ($pun_user['g_id'] > PUN_MOD)
        {
            if ($pun_user['g_search'] == '1')
                $links[] = '<li id="navsearch"><a href="search.php">'.$lang_common['Search'].'</a>';

            $links[] = '<li id="navprofile"><a href="profile.php?id='.$pun_user['id'].'">'.$lang_common['Profile'].'</a>';
            $links[] = '<li id="navlogout"><a href="login.php?action=out&id='.$pun_user['id'].'">'.$lang_common['Logout'].'</a>';
        }
        else
        {
            $links[] = '<li id="navsearch"><a href="search.php">'.$lang_common['Search'].'</a>';
            $links[] = '<li id="navprofile"><a href="profile.php?id='.$pun_user['id'].'">'.$lang_common['Profile'].'</a>';
            $links[] = '<li id="navadmin"><a href="admin_index.php">'.$lang_common['Admin'].'</a>';
            $links[] = '<li id="navlogout"><a href="login.php?action=out&id='.$pun_user['id'].'">'.$lang_common['Logout'].'</a>';
        }
    }

    // Are there any additional navlinks we should insert into the array before imploding it?
    if ($pun_config['o_additional_navlinks'] != '')
    {
        if (preg_match_all('#([0-9]+)\s*=\s*(.*?)\n#s', $pun_config['o_additional_navlinks']."\n", $extra_links))
        {
            // Insert any additional links into the $links array (at the correct index)
            for ($i = 0; $i < count($extra_links[1]); ++$i)
                array_splice($links, $extra_links[1][$i], 0, array('<li id="navextra'.($i + 1).'">'.$extra_links[2][$i]));
        }
    }

    return '<ul>'."\n\t\t\t\t".implode($lang_common['Link separator'].'</li>'."\n\t\t\t\t", $links).'</li>'."\n\t\t\t".'</ul>';
}


//
// Display the profile navigation menu
//
function generate_profile_menu($page = '')
{
    global $lang_profile, $pun_config, $pun_user, $id;

?>
<div id="profile" class="block2col">
    <div class="blockmenu">
        <h2><span><?php echo $lang_profile['Profile menu'] ?></span></h2>
        <div class="box">
            <div class="inbox">
                <ul>
                    <li<?php if ($page == 'essentials') echo ' class="isactive"'; ?>><a href="profile.php?section=essentials&id=<?php echo $id ?>"><?php echo $lang_profile['Section essentials'] ?></a></li>
                    <li<?php if ($page == 'personal') echo ' class="isactive"'; ?>><a href="profile.php?section=personal&id=<?php echo $id ?>"><?php echo $lang_profile['Section personal'] ?></a></li>
                    <li<?php if ($page == 'messaging') echo ' class="isactive"'; ?>><a href="profile.php?section=messaging&id=<?php echo $id ?>"><?php echo $lang_profile['Section messaging'] ?></a></li>
                    <li<?php if ($page == 'personality') echo ' class="isactive"'; ?>><a href="profile.php?section=personality&id=<?php echo $id ?>"><?php echo $lang_profile['Section personality'] ?></a></li>
                    <li<?php if ($page == 'display') echo ' class="isactive"'; ?>><a href="profile.php?section=display&id=<?php echo $id ?>"><?php echo $lang_profile['Section display'] ?></a></li>
                    <li<?php if ($page == 'privacy') echo ' class="isactive"'; ?>><a href="profile.php?section=privacy&id=<?php echo $id ?>"><?php echo $lang_profile['Section privacy'] ?></a></li>
<?php if ($pun_user['g_id'] == PUN_ADMIN || ($pun_user['g_id'] == PUN_MOD && $pun_config['p_mod_ban_users'] == '1')): ?>                    <li<?php if ($page == 'admin') echo ' class="isactive"'; ?>><a href="profile.php?section=admin&id=<?php echo $id ?>"><?php echo $lang_profile['Section admin'] ?></a></li>
<?php endif; ?>                </ul>
            </div>
        </div>
    </div>
<?php

}


//
// Update posts, topics, last_post, last_post_id and last_poster for a forum (redirect topics are not included)
//
function update_forum($forum_id)
{
    global $db;

    $result = $db->query('SELECT COUNT(id), SUM(num_replies) FROM '.$db->prefix.'topics WHERE moved_to IS NULL AND forum_id='.$forum_id) or error('Unable to fetch forum topic count', __FILE__, __LINE__, $db->error());
    list($num_topics, $num_posts) = $db->fetch_row($result);

    $num_posts = $num_posts + $num_topics;        // $num_posts is only the sum of all replies (we have to add the topic posts)

    $result = $db->query('SELECT last_post, last_post_id, last_poster FROM '.$db->prefix.'topics WHERE forum_id='.$forum_id.' AND moved_to IS NULL ORDER BY last_post DESC LIMIT 1') or error('Unable to fetch last_post/last_post_id/last_poster', __FILE__, __LINE__, $db->error());
    if ($db->num_rows($result))        // There are topics in the forum
    {
        list($last_post, $last_post_id, $last_poster) = $db->fetch_row($result);

        $db->query('UPDATE '.$db->prefix.'forums SET num_topics='.$num_topics.', num_posts='.$num_posts.', last_post='.$last_post.', last_post_id='.$last_post_id.', last_poster=\''.$db->escape($last_poster).'\' WHERE id='.$forum_id) or error('Unable to update last_post/last_post_id/last_poster', __FILE__, __LINE__, $db->error());
    }
    else    // There are no topics
        $db->query('UPDATE '.$db->prefix.'forums SET num_topics=0, num_posts=0, last_post=NULL, last_post_id=NULL, last_poster=NULL WHERE id='.$forum_id) or error('Unable to update last_post/last_post_id/last_poster', __FILE__, __LINE__, $db->error());
}


//
// Delete a topic and all of it's posts
//
function delete_topic($topic_id)
{
    global $db;

    // Delete the topic and any redirect topics
    $db->query('DELETE FROM '.$db->prefix.'topics WHERE id='.$topic_id.' OR moved_to='.$topic_id) or error('Unable to delete topic', __FILE__, __LINE__, $db->error());

    // Create a list of the post ID's in this topic
    $post_ids = '';
    $result = $db->query('SELECT id FROM '.$db->prefix.'posts WHERE topic_id='.$topic_id) or error('Unable to fetch posts', __FILE__, __LINE__, $db->error());
    while ($row = $db->fetch_row($result))
        $post_ids .= ($post_ids != '') ? ','.$row[0] : $row[0];

    // Make sure we have a list of post ID's
    if ($post_ids != '')
    {
        strip_search_index($post_ids);

        // Delete posts in topic
        $db->query('DELETE FROM '.$db->prefix.'posts WHERE topic_id='.$topic_id) or error('Unable to delete posts', __FILE__, __LINE__, $db->error());
    }

    // Delete any subscriptions for this topic
    $db->query('DELETE FROM '.$db->prefix.'subscriptions WHERE topic_id='.$topic_id) or error('Unable to delete subscriptions', __FILE__, __LINE__, $db->error());
}


//
// Delete a single post
//
function delete_post($post_id, $topic_id)
{
    global $db;

    $result = $db->query('SELECT id, poster, posted FROM '.$db->prefix.'posts WHERE topic_id='.$topic_id.' ORDER BY id DESC LIMIT 2') or error('Unable to fetch post info', __FILE__, __LINE__, $db->error());
    list($last_id, ,) = $db->fetch_row($result);
    list($second_last_id, $second_poster, $second_posted) = $db->fetch_row($result);

    // Delete the post
    $db->query('DELETE FROM '.$db->prefix.'posts WHERE id='.$post_id) or error('Unable to delete post', __FILE__, __LINE__, $db->error());

    strip_search_index($post_id);

    // Count number of replies in the topic
    $result = $db->query('SELECT COUNT(id) FROM '.$db->prefix.'posts WHERE topic_id='.$topic_id) or error('Unable to fetch post count for topic', __FILE__, __LINE__, $db->error());
    $num_replies = $db->result($result, 0) - 1;

    // If the message we deleted is the most recent in the topic (at the end of the topic)
    if ($last_id == $post_id)
    {
        // If there is a $second_last_id there is more than 1 reply to the topic
        if (!empty($second_last_id))
            $db->query('UPDATE '.$db->prefix.'topics SET last_post='.$second_posted.', last_post_id='.$second_last_id.', last_poster=\''.$db->escape($second_poster).'\', num_replies='.$num_replies.' WHERE id='.$topic_id) or error('Unable to update topic', __FILE__, __LINE__, $db->error());
        else
            // We deleted the only reply, so now last_post/last_post_id/last_poster is posted/id/poster from the topic itself
            $db->query('UPDATE '.$db->prefix.'topics SET last_post=posted, last_post_id=id, last_poster=poster, num_replies='.$num_replies.' WHERE id='.$topic_id) or error('Unable to update topic', __FILE__, __LINE__, $db->error());
    }
    else
        // Otherwise we just decrement the reply counter
        $db->query('UPDATE '.$db->prefix.'topics SET num_replies='.$num_replies.' WHERE id='.$topic_id) or error('Unable to update topic', __FILE__, __LINE__, $db->error());
}


//
// Replace censored words in $text
//
function censor_words($text)
{
    global $db;
    static $search_for, $replace_with;

    // If not already built in a previous call, build an array of censor words and their replacement text
    if (!isset($search_for))
    {
        $result = $db->query('SELECT search_for, replace_with FROM '.$db->prefix.'censoring') or error('Unable to fetch censor word list', __FILE__, __LINE__, $db->error());
        $num_words = $db->num_rows($result);

        $search_for = array();
        for ($i = 0; $i < $num_words; ++$i)
        {
            list($search_for[$i], $replace_with[$i]) = $db->fetch_row($result);
            $search_for[$i] = '/\b('.str_replace('\*', '\w*?', preg_quote($search_for[$i], '/')).')\b/i';
        }
    }

    if (!empty($search_for))
        $text = substr(preg_replace($search_for, $replace_with, ' '.$text.' '), 1, -1);

    return $text;
}


//
// Determines the correct title for $user
// $user must contain the elements 'username', 'title', 'posts', 'g_id' and 'g_user_title'
//
function get_title($user)
{
    global $db, $pun_config, $pun_bans, $lang_common;
    static $ban_list, $pun_ranks;

    // If not already built in a previous call, build an array of lowercase banned usernames
    if (empty($ban_list))
    {
        $ban_list = array();

        foreach ($pun_bans as $cur_ban)
            $ban_list[] = strtolower($cur_ban['username']);
    }

    // If not already loaded in a previous call, load the cached ranks
    if ($pun_config['o_ranks'] == '1' && empty($pun_ranks))
    {
        @include PUN_ROOT.'cache/cache_ranks.php';
        if (!defined('PUN_RANKS_LOADED'))
        {
            require_once PUN_ROOT.'include/cache.php';
            generate_ranks_cache();
            require PUN_ROOT.'cache/cache_ranks.php';
        }
    }

    // If the user has a custom title
    if ($user['title'] != '')
        $user_title = pun_htmlspecialchars($user['title']);
    // If the user is banned
    else if (in_array(strtolower($user['username']), $ban_list))
        $user_title = $lang_common['Banned'];
    // If the user group has a default user title
    else if ($user['g_user_title'] != '')
        $user_title = pun_htmlspecialchars($user['g_user_title']);
    // If the user is a guest
    else if ($user['g_id'] == PUN_GUEST)
        $user_title = $lang_common['Guest'];
    else
    {
        // Are there any ranks?
        if ($pun_config['o_ranks'] == '1' && !empty($pun_ranks))
        {
            @reset($pun_ranks);
            while (list(, $cur_rank) = @each($pun_ranks))
            {
                if (intval($user['num_posts']) >= $cur_rank['min_posts'])
                    $user_title = pun_htmlspecialchars($cur_rank['rank']);
            }
        }

        // If the user didn't "reach" any rank (or if ranks are disabled), we assign the default
        if (!isset($user_title))
            $user_title = $lang_common['Member'];
    }

    return $user_title;
}


//
// Generate a string with numbered links (for multipage scripts)
//
function paginate($num_pages, $cur_page, $link_to)
{
    $pages = array();
    $link_to_all = false;

    // If $cur_page == -1, we link to all pages (used in viewforum.php)
    if ($cur_page == -1)
    {
        $cur_page = 1;
        $link_to_all = true;
    }

    if ($num_pages <= 1)
        $pages = array('<strong>1</strong>');
    else
    {
        if ($cur_page > 3)
        {
            $pages[] = '<a href="'.$link_to.'&p=1">1</a>';

            if ($cur_page != 4)
                $pages[] = '…';
        }

        // Don't ask me how the following works. It just does, OK? :-)
        for ($current = $cur_page - 2, $stop = $cur_page + 3; $current < $stop; ++$current)
        {
            if ($current < 1 || $current > $num_pages)
                continue;
            else if ($current != $cur_page || $link_to_all)
                $pages[] = '<a href="'.$link_to.'&p='.$current.'">'.$current.'</a>';
            else
                $pages[] = '<strong>'.$current.'</strong>';
        }

        if ($cur_page <= ($num_pages-3))
        {
            if ($cur_page != ($num_pages-3))
                $pages[] = '…';

            $pages[] = '<a href="'.$link_to.'&p='.$num_pages.'">'.$num_pages.'</a>';
        }
    }

    return implode(' ', $pages);
}


//
// Display a message
//
function message($message, $no_back_link = false)
{
    global $db, $lang_common, $pun_config, $pun_start, $tpl_main;

    if (!defined('PUN_HEADER'))
    {
        global $pun_user;

        $page_title = pun_htmlspecialchars($pun_config['o_board_title']).' / '.$lang_common['Info'];
        require PUN_ROOT.'header.php';
    }

?>

<div id="msg" class="block">
    <h2><span><?php echo $lang_common['Info'] ?></span></h2>
    <div class="box">
        <div class="inbox">
        <p><?php echo $message ?></p>
<?php if (!$no_back_link): ?>        <p><a href="javascript: history.go(-1)"><?php echo $lang_common['Go back'] ?></a></p>
<?php endif; ?>        </div>
    </div>
</div>
<?php

    require PUN_ROOT.'footer.php';
}


//
// Format a time string according to $time_format and timezones
//
function format_time($timestamp, $date_only = false)
{
    global $pun_config, $lang_common, $pun_user;

    if ($timestamp == '')
        return $lang_common['Never'];

    $diff = ($pun_user['timezone'] - $pun_config['o_server_timezone']) * 3600;
    $timestamp += $diff;
    $now = time();

    $date = date($pun_config['o_date_format'], $timestamp);
    $today = date($pun_config['o_date_format'], $now+$diff);
    $yesterday = date($pun_config['o_date_format'], $now+$diff-86400);

    if ($date == $today)
        $date = $lang_common['Today'];
    else if ($date == $yesterday)
        $date = $lang_common['Yesterday'];

    if (!$date_only)
        return $date.' '.date($pun_config['o_time_format'], $timestamp);
    else
        return $date;
}


//
// If we are running pre PHP 4.3.0, we add our own implementation of file_get_contents
//
if (!function_exists('file_get_contents'))
{
    function file_get_contents($filename, $use_include_path = 0)
    {
        $data = '';

        if ($fh = fopen($filename, 'rb', $use_include_path))
        {
            $data = fread($fh, filesize($filename));
            fclose($fh);
        }

        return $data;
    }
}


//
// Make sure that HTTP_REFERER matches $pun_config['o_base_url']/$script
//
function confirm_referrer($script)
{
    global $pun_config, $lang_common;

    if (!preg_match('#^'.preg_quote(str_replace('www.', '', $pun_config['o_base_url']).'/'.$script, '#').'#i', str_replace('www.', '', (isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : ''))))
        message($lang_common['Bad referrer']);
}


//
// Generate a random password of length $len
//
function random_pass($len)
{
    $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';

    $password = '';
    for ($i = 0; $i < $len; ++$i)
        $password .= substr($chars, (mt_rand() % strlen($chars)), 1);

    return $password;
}


//
// Compute a hash of $str
// Uses sha1() if available. If not, SHA1 through mhash() if available. If not, fall back on md5().
//
function pun_hash($str)
{
    if (function_exists('sha1'))    // Only in PHP 4.3.0+
        return sha1($str);
    else if (function_exists('mhash'))    // Only if Mhash library is loaded
        return bin2hex(mhash(MHASH_SHA1, $str));
    else
        return md5($str);
}


//
// Try to determine the correct remote IP-address
//
function get_remote_address()
{
    return $_SERVER['REMOTE_ADDR'];
}


//
// Equivalent to htmlspecialchars(), but allows &#[0-9]+ (for unicode)
//
function pun_htmlspecialchars($str)
{
    $str = preg_replace('/&(?!#[0-9]+;)/s', '&', $str);
    $str = str_replace(array('<', '>', '"'), array('<', '>', '"'), $str);

    return $str;
}


//
// Equivalent to strlen(), but counts &#[0-9]+ as one character (for unicode)
//
function pun_strlen($str)
{
    return strlen(preg_replace('/&#([0-9]+);/', '!', $str));
}


//
// Convert \r\n and \r to \n
//
function pun_linebreaks($str)
{
    return str_replace("\r", "\n", str_replace("\r\n", "\n", $str));
}


//
// A more aggressive version of trim()
//
function pun_trim($str)
{
    global $lang_common;

    if (strpos($lang_common['lang_encoding'], '8859') !== false)
    {
        $fishy_chars = array(chr(0x81), chr(0x8D), chr(0x8F), chr(0x90), chr(0x9D), chr(0xA0));
        return trim(str_replace($fishy_chars, ' ', $str));
    }
    else
        return trim($str);
}


//
// Display a message when board is in maintenance mode
//
function maintenance_message()
{
    global $db, $pun_config, $lang_common, $pun_user;

    // Deal with newlines, tabs and multiple spaces
    $pattern = array("\t", '  ', '  ');
    $replace = array('    ', '  ', '  ');
    $message = str_replace($pattern, $replace, $pun_config['o_maintenance_message']);


    // Load the maintenance template
    $tpl_maint = trim(file_get_contents(PUN_ROOT.'include/template/maintenance.tpl'));


    // START SUBST - <pun_content_direction>
    $tpl_maint = str_replace('<pun_content_direction>', $lang_common['lang_direction'], $tpl_maint);
    // END SUBST - <pun_content_direction>


    // START SUBST - <pun_char_encoding>
    $tpl_maint = str_replace('<pun_char_encoding>', $lang_common['lang_encoding'], $tpl_maint);
    // END SUBST - <pun_char_encoding>


    // START SUBST - <pun_head>
    ob_start();

?>
<title><?php echo pun_htmlspecialchars($pun_config['o_board_title']).' / '.$lang_common['Maintenance'] ?></title>
<link rel="stylesheet" type="text/css" href="style/<?php echo $pun_user['style'].'.css' ?>" />
<?php

    $tpl_temp = trim(ob_get_contents());
    $tpl_maint = str_replace('<pun_head>', $tpl_temp, $tpl_maint);
    ob_end_clean();
    // END SUBST - <pun_head>


    // START SUBST - <pun_maint_heading>
    $tpl_maint = str_replace('<pun_maint_heading>', $lang_common['Maintenance'], $tpl_maint);
    // END SUBST - <pun_maint_heading>


    // START SUBST - <pun_maint_message>
    $tpl_maint = str_replace('<pun_maint_message>', $message, $tpl_maint);
    // END SUBST - <pun_maint_message>


    // End the transaction
    $db->end_transaction();


    // START SUBST - <pun_include "*">
    while (preg_match('#<pun_include "([^/\\\\]*?)">#', $tpl_maint, $cur_include))
    {
        if (!file_exists(PUN_ROOT.'include/user/'.$cur_include[1]))
            error('Unable to process user include <pun_include "'.htmlspecialchars($cur_include[1]).'"> from template maintenance.tpl. There is no such file in folder /include/user/');

        ob_start();
        include PUN_ROOT.'include/user/'.$cur_include[1];
        $tpl_temp = ob_get_contents();
        $tpl_maint = str_replace($cur_include[0], $tpl_temp, $tpl_maint);
        ob_end_clean();
    }
    // END SUBST - <pun_include "*">


    // Close the db connection (and free up any result data)
    $db->close();

    exit($tpl_maint);
}


//
// Display $message and redirect user to $destination_url
//
function redirect($destination_url, $message)
{
    global $db, $pun_config, $lang_common, $pun_user;

    if ($destination_url == '')
        $destination_url = 'index.php';

    // If the delay is 0 seconds, we might as well skip the redirect all together
    if ($pun_config['o_redirect_delay'] == '0')
        header('Location: '.str_replace('&', '&', $destination_url));


    // Load the redirect template
    $tpl_redir = trim(file_get_contents(PUN_ROOT.'include/template/redirect.tpl'));


    // START SUBST - <pun_content_direction>
    $tpl_redir = str_replace('<pun_content_direction>', $lang_common['lang_direction'], $tpl_redir);
    // END SUBST - <pun_content_direction>


    // START SUBST - <pun_char_encoding>
    $tpl_redir = str_replace('<pun_char_encoding>', $lang_common['lang_encoding'], $tpl_redir);
    // END SUBST - <pun_char_encoding>


    // START SUBST - <pun_head>
    ob_start();

?>
<meta http-equiv="refresh" content="<?php echo $pun_config['o_redirect_delay'] ?>;URL=<?php echo str_replace(array('<', '>', '"'), array('<', '>', '"'), $destination_url) ?>" />
<title><?php echo pun_htmlspecialchars($pun_config['o_board_title']).' / '.$lang_common['Redirecting'] ?></title>
<link rel="stylesheet" type="text/css" href="style/<?php echo $pun_user['style'].'.css' ?>" />
<?php

    $tpl_temp = trim(ob_get_contents());
    $tpl_redir = str_replace('<pun_head>', $tpl_temp, $tpl_redir);
    ob_end_clean();
    // END SUBST - <pun_head>


    // START SUBST - <pun_redir_heading>
    $tpl_redir = str_replace('<pun_redir_heading>', $lang_common['Redirecting'], $tpl_redir);
    // END SUBST - <pun_redir_heading>


    // START SUBST - <pun_redir_text>
    $tpl_temp = $message.'<br /><br />'.'<a href="'.$destination_url.'">'.$lang_common['Click redirect'].'</a>';
    $tpl_redir = str_replace('<pun_redir_text>', $tpl_temp, $tpl_redir);
    // END SUBST - <pun_redir_text>


    // START SUBST - <pun_footer>
    ob_start();

    // End the transaction
    $db->end_transaction();

    // Display executed queries (if enabled)
    if (defined('PUN_SHOW_QUERIES'))
        display_saved_queries();

    $tpl_temp = trim(ob_get_contents());
    $tpl_redir = str_replace('<pun_footer>', $tpl_temp, $tpl_redir);
    ob_end_clean();
    // END SUBST - <pun_footer>


    // START SUBST - <pun_include "*">
    while (preg_match('#<pun_include "([^/\\\\]*?)">#', $tpl_redir, $cur_include))
    {
        if (!file_exists(PUN_ROOT.'include/user/'.$cur_include[1]))
            error('Unable to process user include <pun_include "'.htmlspecialchars($cur_include[1]).'"> from template redirect.tpl. There is no such file in folder /include/user/');

        ob_start();
        include PUN_ROOT.'include/user/'.$cur_include[1];
        $tpl_temp = ob_get_contents();
        $tpl_redir = str_replace($cur_include[0], $tpl_temp, $tpl_redir);
        ob_end_clean();
    }
    // END SUBST - <pun_include "*">


    // Close the db connection (and free up any result data)
    $db->close();

    exit($tpl_redir);
}


//
// Display a simple error message
//
function error($message, $file, $line, $db_error = false)
{
    global $pun_config;

    // Set a default title if the script failed before $pun_config could be populated
    if (empty($pun_config))
        $pun_config['o_board_title'] = 'PunBB';

    // Empty output buffer and stop buffering
    @ob_end_clean();

    // "Restart" output buffering if we are using ob_gzhandler (since the gzip header is already sent)
    if (!empty($pun_config['o_gzip']) && extension_loaded('zlib') && (strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== false || strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'deflate') !== false))
        ob_start('ob_gzhandler');

?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html dir="ltr">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title><?php echo pun_htmlspecialchars($pun_config['o_board_title']) ?> / Error</title>
<style type="text/css">
<!--
BODY {MARGIN: 10% 20% auto 20%; font: 10px Verdana, Arial, Helvetica, sans-serif}
#errorbox {BORDER: 1px solid #B84623}
H2 {MARGIN: 0; COLOR: #FFFFFF; BACKGROUND-COLOR: #B84623; FONT-SIZE: 1.1em; PADDING: 5px 4px}
#errorbox DIV {PADDING: 6px 5px; BACKGROUND-COLOR: #F1F1F1}
-->
</style>
</head>
<body>

<div id="errorbox">
    <h2>An error was encountered</h2>
    <div>
<?php

    if (defined('PUN_DEBUG'))
    {
        echo "\t\t".'<strong>File:</strong> '.$file.'<br />'."\n\t\t".'<strong>Line:</strong> '.$line.'<br /><br />'."\n\t\t".'<strong>PunBB reported</strong>: '.$message."\n";

        if ($db_error)
        {
            echo "\t\t".'<br /><br /><strong>Database reported:</strong> '.pun_htmlspecialchars($db_error['error_msg']).(($db_error['error_no']) ? ' (Errno: '.$db_error['error_no'].')' : '')."\n";

            if ($db_error['error_sql'] != '')
                echo "\t\t".'<br /><br /><strong>Failed query:</strong> '.pun_htmlspecialchars($db_error['error_sql'])."\n"; 
        }
    }
    else
        echo "\t\t".'Error: <strong>'.$message.'.</strong>'."\n";

?>
    </div>
</div>

</body>
</html>
<?php

    // If a database connection was established (before this error) we close it
    if ($db_error)
        $GLOBALS['db']->close();

    exit;
}

// DEBUG FUNCTIONS BELOW

//
// Display executed queries (if enabled)
//
function display_saved_queries()
{
    global $db, $lang_common;

    // Get the queries so that we can print them out
    $saved_queries = $db->get_saved_queries();

?>

<div id="debug" class="blocktable">
    <h2><span><?php echo $lang_common['Debug table'] ?></span></h2>
    <div class="box">
        <div class="inbox">
            <table cellspacing="0">
            <thead>
                <tr>
                    <th class="tcl" scope="col">Time (s)</th>
                    <th class="tcr" scope="col">Query</th>
                </tr>
            </thead>
            <tbody>
<?php

    $query_time_total = 0.0;
    while (list(, $cur_query) = @each($saved_queries))
    {
        $query_time_total += $cur_query[1];

?>
                <tr>
                    <td class="tcl"><?php echo ($cur_query[1] != 0) ? $cur_query[1] : ' ' ?></td>
                    <td class="tcr"><?php echo pun_htmlspecialchars($cur_query[0]) ?></td>
                </tr>
<?php

    }

?>
                <tr>
                    <td class="tcl" colspan="2">Total query time: <?php echo $query_time_total ?> s</td>
                </tr>
            </tbody>
            </table>
        </div>
    </div>
</div>
<?php

}


//
// Unset any variables instantiated as a result of register_globals being enabled
//
function unregister_globals()
{
    // Prevent script.php?GLOBALS[foo]=bar
    if (isset($_REQUEST['GLOBALS']) || isset($_FILES['GLOBALS']))
        exit('I\'ll have a steak sandwich and... a steak sandwich.');
    
    // Variables that shouldn't be unset
    $no_unset = array('GLOBALS', '_GET', '_POST', '_COOKIE', '_REQUEST', '_SERVER', '_ENV', '_FILES');

    // Remove elements in $GLOBALS that are present in any of the superglobals
    $input = array_merge($_GET, $_POST, $_COOKIE, $_SERVER, $_ENV, $_FILES, isset($_SESSION) && is_array($_SESSION) ? $_SESSION : array());
    foreach ($input as $k => $v)
    {
        if (!in_array($k, $no_unset) && isset($GLOBALS[$k]))
        {
            unset($GLOBALS[$k]);
            unset($GLOBALS[$k]);    // Double unset to circumvent the zend_hash_del_key_or_index hole in PHP <4.4.3 and <5.1.4
        }
    }
}


//
// Dump contents of variable(s)
//
function dump()
{
    echo '<pre>';

    $num_args = func_num_args();

    for ($i = 0; $i < $num_args; ++$i)
    {
        print_r(func_get_arg($i));
        echo "\n\n";
    }

    echo '</pre>';
    exit;
}
//
// Generate the whos online block
//
function generate_whosonline()
{
    global $pun_config, $lang_common, $pun_user, $db;
    
    if ($pun_user['is_guest'])
    {
        require PUN_ROOT.'lang/'.$pun_user['language'].'/login.php';
        return 'Welcome Guest!<br />
            Please login.<br />
            <form id="login" method="post" action="login.php?action=in" onsubmit="return process_form(this)">
                <input type="hidden" name="form_sent" value="1" />
                <input type="hidden" name="redirect_url" value="index.php" />
                <label><strong>Username</strong><br /><input type="text" name="req_username" size="13" maxlength="25" tabindex="1" /><br /></label>
                <label><strong>Password</strong><br /><input type="password" name="req_password" size="13" maxlength="16" tabindex="2" /><br /></label>
                <p><a href="register.php" tabindex="4">'.$lang_login['Not registered'].'</a><br />
                <a href="login.php?action=forget" tabindex="5">'.$lang_login['Forgotten pass'].'</a></p>
                <p><input type="submit" name="login" value="Login" tabindex="3" /></p>
            </form>';
    }
    else
    {
        require PUN_ROOT.'lang/'.$pun_user['language'].'/index.php';
        $result = $db->query('SELECT COUNT(id)-1 FROM '.$db->prefix.'users') or error('Unable to fetch total user count', __FILE__, __LINE__, $db->error());
        $stats['total_users'] = $db->result($result);
        
        $result = $db->query('SELECT id, username FROM '.$db->prefix.'users ORDER BY registered DESC LIMIT 1') or error('Unable to fetch newest registered user', __FILE__, __LINE__, $db->error());
        $stats['last_user'] = $db->fetch_assoc($result);
        
        $result = $db->query('SELECT SUM(num_topics), SUM(num_posts) FROM '.$db->prefix.'forums') or error('Unable to fetch topic/post count', __FILE__, __LINE__, $db->error());
        list($stats['total_topics'], $stats['total_posts']) = $db->fetch_row($result);
        
        if ($pun_config['o_users_online'] == '1')
        {
            // Fetch users online info and generate strings for output
            $num_guests = 0;
            $users = array();
            $online = array();
            $result = $db->query('SELECT user_id, ident FROM '.$db->prefix.'online WHERE idle=0 ORDER BY ident', true) or error('Unable to fetch online list', __FILE__, __LINE__, $db->error());
        
            while ($pun_user_online = $db->fetch_assoc($result))
            {
                if ($pun_user_online['user_id'] > 1)
                    $users[] = "\n\t\t\t\t".'<a href="profile.php?id='.$pun_user_online['user_id'].'">'.pun_htmlspecialchars($pun_user_online['ident']).'</a><br />';
                else
                    ++$num_guests;
            }
        
            $num_users = count($users);
            $online[] = "\t\t\t\t".$lang_index['Users online'].': <strong>'.$num_users.'</strong><br />'."\n\t\t\t\t".$lang_index['Guests online'].': <strong>'.$num_guests.'</strong>'."\n\t\t\t"."\n";
        
        
            if ($num_users > 0 && $num_users < 10)
                $online[] = "\t\t\t"."\n\t\t\t\t".'<br /><strong>'.$lang_index['Online'].': </strong>'."\t\t\t\t".implode($users)."\n";
            else
                $online[] = "\t\t\t".'<div class="clearer"></div>'."\n";
        
        }
        
        return 'Welcome <strong>'.$pun_user['username'].'</strong><br /><br />
            '.implode($online,'').'<br />
            Users: <strong>'. $stats['total_users'].'</strong><br />
            Topics: <strong>'.$stats['total_topics'].'</strong><br />
            Posts: <strong>'.$stats['total_posts'].'</strong><br />';
    }
}

function top_poster()
{
    global $lang_common, $db, $pun_config, $db_prefix;
 
    $result = $db->query('SELECT username, num_posts, id FROM '.$db_prefix.'users ORDER BY num_posts DESC LIMIT 5') or error('Unable to fetch post info', __FILE__, __LINE__, $db->error());
 
    $outhtml='<div class="block"><h2><span>Top Posters</span></h2><div class="box">';
    $outhtml=$outhtml.'<div class="inbox">';
        while ($cur_post = $db->fetch_assoc($result))
    {
          $outhtml.='<div class="inbox"><a href="profile.php?id='.$cur_post['id'].'">'.$cur_post['username'].'</a><div><strong>Posts:</strong>'.$cur_post['num_posts'].'</div></div>';        
    }    
    $outhtml.='</div>';
    $outhtml.='</div></div>';
    return $outhtml;