source: trunk/www.guidonia.net/wp/wp-admin/includes/bookmark.php@ 44

<?php
/**
 * WordPress Bookmark Administration API
 *
 * @package WordPress
 * @subpackage Administration
 */

/**
 * {@internal Missing Short Description}}
 *
 * @since unknown
 *
 * @return unknown
 */
function add_link() {
        return edit_link();
}

/**
 * {@internal Missing Short Description}}
 *
 * @since unknown
 *
 * @param unknown_type $link_id
 * @return unknown
 */
function edit_link( $link_id = '' ) {
        if (!current_user_can( 'manage_links' ))
                wp_die( __( 'Cheatin&#8217; uh?' ));

        $_POST['link_url'] = esc_html( $_POST['link_url'] );
        $_POST['link_url'] = esc_url($_POST['link_url']);
        $_POST['link_name'] = esc_html( $_POST['link_name'] );
        $_POST['link_image'] = esc_html( $_POST['link_image'] );
        $_POST['link_rss'] = esc_url($_POST['link_rss']);
        if ( !isset($_POST['link_visible']) || 'N' != $_POST['link_visible'] )
                $_POST['link_visible'] = 'Y';

        if ( !empty( $link_id ) ) {
                $_POST['link_id'] = $link_id;
                return wp_update_link( $_POST);
        } else {
                return wp_insert_link( $_POST);
        }
}

/**
 * {@internal Missing Short Description}}
 *
 * @since unknown
 *
 * @return unknown
 */
function get_default_link_to_edit() {
        if ( isset( $_GET['linkurl'] ) )
                $link->link_url = esc_url( $_GET['linkurl']);
        else
                $link->link_url = '';

        if ( isset( $_GET['name'] ) )
                $link->link_name = esc_attr( $_GET['name']);
        else
                $link->link_name = '';

        $link->link_visible = 'Y';

        return $link;
}

/**
 * {@internal Missing Short Description}}
 *
 * @since unknown
 *
 * @param unknown_type $link_id
 * @return unknown
 */
function wp_delete_link( $link_id ) {
        global $wpdb;

        do_action( 'delete_link', $link_id );

        wp_delete_object_term_relationships( $link_id, 'link_category' );

        $wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->links WHERE link_id = %d", $link_id ) );

        do_action( 'deleted_link', $link_id );

        clean_bookmark_cache( $link_id );

        return true;
}

/**
 * {@internal Missing Short Description}}
 *
 * @since unknown
 *
 * @param unknown_type $link_id
 * @return unknown
 */
function wp_get_link_cats( $link_id = 0 ) {

        $cats = wp_get_object_terms( $link_id, 'link_category', 'fields=ids' );

        return array_unique( $cats );
}

/**
 * {@internal Missing Short Description}}
 *
 * @since unknown
 *
 * @param unknown_type $link_id
 * @return unknown
 */
function get_link_to_edit( $link_id ) {
        return get_bookmark( $link_id, OBJECT, 'edit' );
}

/**
 * {@internal Missing Short Description}}
 *
 * @since unknown
 *
 * @param unknown_type $linkdata
 * @return unknown
 */
function wp_insert_link( $linkdata, $wp_error = false ) {
        global $wpdb, $current_user;

        $defaults = array( 'link_id' => 0, 'link_name' => '', 'link_url' => '', 'link_rating' => 0 );

        $linkdata = wp_parse_args( $linkdata, $defaults );
        $linkdata = sanitize_bookmark( $linkdata, 'db' );

        extract( stripslashes_deep( $linkdata ), EXTR_SKIP );

        $update = false;

        if ( !empty( $link_id ) )
                $update = true;

        if ( trim( $link_name ) == '' ) {
                if ( trim( $link_url ) != '' ) {
                        $link_name = $link_url;
                } else {
                        return 0;
                }
        }

        if ( trim( $link_url ) == '' )
                return 0;

        if ( empty( $link_rating ) )
                $link_rating = 0;

        if ( empty( $link_image ) )
                $link_image = '';

        if ( empty( $link_target ) )
                $link_target = '';

        if ( empty( $link_visible ) )
                $link_visible = 'Y';

        if ( empty( $link_owner ) )
                $link_owner = $current_user->id;

        if ( empty( $link_notes ) )
                $link_notes = '';

        if ( empty( $link_description ) )
                $link_description = '';

        if ( empty( $link_rss ) )
                $link_rss = '';

        if ( empty( $link_rel ) )
                $link_rel = '';

        // Make sure we set a valid category
        if ( ! isset( $link_category ) ||0 == count( $link_category ) || !is_array( $link_category ) ) {
                $link_category = array( get_option( 'default_link_category' ) );
        }

        if ( $update ) {
                if ( false === $wpdb->query( $wpdb->prepare( "UPDATE $wpdb->links SET link_url = %s,
                        link_name = %s, link_image = %s, link_target = %s,
                        link_visible = %s, link_description = %s, link_rating = %s,
                        link_rel = %s, link_notes = %s, link_rss = %s
                        WHERE link_id = %s", $link_url, $link_name, $link_image, $link_target, $link_visible, $link_description, $link_rating, $link_rel, $link_notes, $link_rss, $link_id ) ) ) {
                        if ( $wp_error )
                                return new WP_Error( 'db_update_error', __( 'Could not update link in the database' ), $wpdb->last_error );
                        else
                                return 0;
                }
        } else {
                if ( false === $wpdb->query( $wpdb->prepare( "INSERT INTO $wpdb->links (link_url, link_name, link_image, link_target, link_description, link_visible, link_owner, link_rating, link_rel, link_notes, link_rss) VALUES(%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)",
                $link_url,$link_name, $link_image, $link_target, $link_description, $link_visible, $link_owner, $link_rating, $link_rel, $link_notes, $link_rss ) ) ) {
                        if ( $wp_error )
                                return new WP_Error( 'db_insert_error', __( 'Could not insert link into the database' ), $wpdb->last_error );
                        else
                                return 0;
                }
                $link_id = (int) $wpdb->insert_id;
        }

        wp_set_link_cats( $link_id, $link_category );

        if ( $update )
                do_action( 'edit_link', $link_id );
        else
                do_action( 'add_link', $link_id );

        clean_bookmark_cache( $link_id );

        return $link_id;
}

/**
 * {@internal Missing Short Description}}
 *
 * @since unknown
 *
 * @param unknown_type $link_id
 * @param unknown_type $link_categories
 */
function wp_set_link_cats( $link_id = 0, $link_categories = array() ) {
        // If $link_categories isn't already an array, make it one:
        if ( !is_array( $link_categories ) || 0 == count( $link_categories ) )
                $link_categories = array( get_option( 'default_link_category' ) );

        $link_categories = array_map( 'intval', $link_categories );
        $link_categories = array_unique( $link_categories );

        wp_set_object_terms( $link_id, $link_categories, 'link_category' );

        clean_bookmark_cache( $link_id );
}       // wp_set_link_cats()

/**
 * {@internal Missing Short Description}}
 *
 * @since unknown
 *
 * @param unknown_type $linkdata
 * @return unknown
 */
function wp_update_link( $linkdata ) {
        $link_id = (int) $linkdata['link_id'];

        $link = get_link( $link_id, ARRAY_A );

        // Escape data pulled from DB.
        $link = add_magic_quotes( $link );

        // Passed link category list overwrites existing category list if not empty.
        if ( isset( $linkdata['link_category'] ) && is_array( $linkdata['link_category'] )
                         && 0 != count( $linkdata['link_category'] ) )
                $link_cats = $linkdata['link_category'];
        else
                $link_cats = $link['link_category'];

        // Merge old and new fields with new fields overwriting old ones.
        $linkdata = array_merge( $link, $linkdata );
        $linkdata['link_category'] = $link_cats;

        return wp_insert_link( $linkdata );
}

?>