remove the node from a list (http://coolshell.cn/articles/8990.html)

remove_bidirection_node_from_list_if.c

void remove_if ( node **head, node **rear, remove_fn rm )
{
    for ( node **curr = head; *curr; ) {
        node *entry = *curr;
        if ( rm ( entry ) ) {
            *curr = entry->next;
            if ( *curr ) {
                (*curr)->previous = entry->previous;
            } else { // the rear node removed
                *rear = entry->previous;
            }
            free ( entry );
        } else {
            curr = &entry->next;
        }
    }
}

remove_node_from_list_if.c

// http://coolshell.cn/articles/8990.html

void remove_if ( node **head, remove_fn rm )
{
    for ( node **curr = head; *curr; ) {
        node *entry = *curr;
        if ( rm ( entry ) ) {
            *curr = entry->next;  // remove 
            free ( entry );
        } else {
            curr = &entry->next;  // move
        }
    }
}

remove:

*curr = entry->next;

move:

curr = &entry->next;