[C/gtk+] Работа с GList

typedef struct _ImageList
{
    gchar* dir_path;
    GList* list;
    GList* current;
    time_t mtime;
} ImageList;

ImageList* image_list_new()
{
    ImageList* il = g_slice_new0( ImageList );

    if( ! supported_formats )
    {
        GSList* formats = gdk_pixbuf_get_formats();
        GSList* format;
        for( format = formats; format; format = format->next )
        {
            char** exts = gdk_pixbuf_format_get_extensions( (GdkPixbufFormat*)format->data );
            char** ext;
            for( ext  = exts; *ext ; ++ext )
                supported_formats = g_slist_prepend( supported_formats, *ext );
            g_free( exts ); 
        }
    }
    return il;
}

gboolean image_list_open_dir( ImageList* il, const char* path, GError** error )
{
    const char* name = NULL;
    GDir* dir;
    struct stat stbuf;

    if( il->dir_path && 0 == strcmp( path, il->dir_path ) )
        return TRUE;

    image_list_close( il );

    if( stat( path, &stbuf ) == -1 )
        return FALSE;

    dir = g_dir_open( path, 0, error );
    if( ! dir )
        return FALSE;

    il->dir_path = g_strdup( path );
    il->mtime = stbuf.st_mtime;

    while( ( name = g_dir_read_name ( dir ) ) )
    {
        if( image_list_is_file_supported( name ) )
            il->list = g_list_prepend( il->list, g_strdup(name) );
    }
    g_dir_close( dir );
    il->list = g_list_reverse( il->list );
    il->current = il->list;
    return TRUE;
}

void
main_win_init( MainWin*mw )
{
   ...
   mw->img_list = image_list_new();
   ...
}

ImageList*
main_win_open( MainWin* mw, const char* file_path)
{
  ...
    char* dir_path = g_path_get_dirname( file_path );
    image_list_open_dir( mw->img_list, dir_path, NULL );
    image_list_sort_by_name( mw->img_list, GTK_SORT_DESCENDING );
    g_free( dir_path );

    char* name = image_list_get_prev(mw->img_list);               
    printf(name);	

    name = image_list_get_prev(mw->img_list);
    printf(name);
}

main_win_open( MainWin* mw)
{
    char* name = image_list_get_prev(mw->img_list);               
    printf(name);	

    name = image_list_get_prev(mw->img_list);
    printf(name);
}

ImageList* il = g_slice_new0( ImageList );