root/tags/2.1/wp-includes/feed.php

<?php

function get_bloginfo_rss($show = '') {
    $info = strip_tags(get_bloginfo($show));
    return apply_filters('bloginfo_rss', convert_chars($info));
}


function bloginfo_rss($show = '') {
    echo get_bloginfo_rss($show);
}


function get_the_title_rss() {
    $title = get_the_title();
    $title = apply_filters('the_title', $title);
    $title = apply_filters('the_title_rss', $title);
    return $title;
}


function the_title_rss() {
    echo get_the_title_rss();
}


function the_content_rss($more_link_text='(more...)', $stripteaser=0, $more_file='', $cut = 0, $encode_html = 0) {
    $content = get_the_content($more_link_text, $stripteaser, $more_file);
    $content = apply_filters('the_content_rss', $content);
    if ( $cut && !$encode_html )
        $encode_html = 2;
    if ( 1== $encode_html ) {
        $content = wp_specialchars($content);
        $cut = 0;
    } elseif ( 0 == $encode_html ) {
        $content = make_url_footnote($content);
    } elseif ( 2 == $encode_html ) {
        $content = strip_tags($content);
    }
    if ( $cut ) {
        $blah = explode(' ', $content);
        if ( count($blah) > $cut ) {
            $k = $cut;
            $use_dotdotdot = 1;
        } else {
            $k = count($blah);
            $use_dotdotdot = 0;
        }
        for ( $i=0; $i<$k; $i++ )
            $excerpt .= $blah[$i].' ';
        $excerpt .= ($use_dotdotdot) ? '...' : '';
        $content = $excerpt;
    }
    $content = str_replace(']]>', ']]&gt;', $content);
    echo $content;
}


function the_excerpt_rss() {
    $output = get_the_excerpt(true);
    echo apply_filters('the_excerpt_rss', $output);
}


function permalink_single_rss($file = '') {
    echo get_permalink();
}


function comment_link() {
    echo get_comment_link();
}


function get_comment_author_rss() {
    return apply_filters('comment_author_rss', get_comment_author() );
}


function comment_author_rss() {
    echo get_comment_author_rss();
}


function comment_text_rss() {
    $comment_text = get_comment_text();
    $comment_text = apply_filters('comment_text_rss', $comment_text);
    echo $comment_text;
}


function comments_rss_link($link_text = 'Comments RSS', $commentsrssfilename = '') {
    $url = comments_rss($commentsrssfilename);
    echo "<a href='$url'>$link_text</a>";
}


function comments_rss($commentsrssfilename = '') {
    global $id;

    if ( '' != get_option('permalink_structure') )
        $url = trailingslashit( get_permalink() ) . 'feed/';
    else
        $url = get_option('home') . "/$commentsrssfilename?feed=rss2&amp;p=$id";

    return apply_filters('post_comments_feed_link', $url);
}


function get_author_rss_link($echo = false, $author_id, $author_nicename) {
    $auth_ID = $author_id;
    $permalink_structure = get_option('permalink_structure');

    if ( '' == $permalink_structure ) {
        $link = get_option('home') . '?feed=rss2&amp;author=' . $author_id;
    } else {
        $link = get_author_posts_url($author_id, $author_nicename);
        $link = $link . "feed/";
    }

    $link = apply_filters('author_feed_link', $link);

    if ( $echo )
        echo $link;
    return $link;
}


function get_category_rss_link($echo = false, $cat_ID, $category_nicename) {
    $permalink_structure = get_option('permalink_structure');

    if ( '' == $permalink_structure ) {
        $link = get_option('home') . '?feed=rss2&amp;cat=' . $cat_ID;
    } else {
        $link = get_category_link($cat_ID);
        $link = $link . "feed/";
    }

    $link = apply_filters('category_feed_link', $link);

    if ( $echo )
        echo $link;
    return $link;
}


function get_the_category_rss($type = 'rss') {
    $categories = get_the_category();
    $the_list = '';
    foreach ( (array) $categories as $category ) {
        $category->cat_name = convert_chars($category->cat_name);
        if ( 'rdf' == $type )
            $the_list .= "\n\t\t<dc:subject><![CDATA[$category->cat_name]]></dc:subject>\n";
        else
            $the_list .= "\n\t\t<category><![CDATA[$category->cat_name]]></category>\n";
    }
    return apply_filters('the_category_rss', $the_list, $type);
}


function the_category_rss($type = 'rss') {
    echo get_the_category_rss($type);
}


function rss_enclosure() {
    global $id, $post;
    if ( !empty($post->post_password) && ($_COOKIE['wp-postpass_'.COOKIEHASH] != $post->post_password) )
        return;

    $custom_fields = get_post_custom();
    if ( is_array($custom_fields) ) {
        while ( list($key, $val) = each($custom_fields) ) { 
            if ( $key == 'enclosure' ) {
                if ( is_array($val) ) {
                    foreach ( (array) $val as $enc ) {
                        $enclosure = split( "\n", $enc );
                        print "<enclosure url='".trim( htmlspecialchars($enclosure[ 0 ]) )."' length='".trim( $enclosure[ 1 ] )."' type='".trim( $enclosure[ 2 ] )."'/>\n";
                    }
                }
            }
        }
    }
}

?>