Hello! See the init_list() function and the list structure. All lists in lib/lists.[hc] have heads. Therefore if n->prev is NULL, you don't have a valid node but a list head, the same for list tail and n->next. All valid nodes have valid both prev and next pointers. Maria On July 27, 2018 8:53:18 AM GMT+02:00, Arvin Gan <AGan@advaoptical.com> wrote:

Hi all, There may be an issue in blow function when deleted the node is the first one, that mean n->prev is NULL....., similarly, same issue as the last one node is deleted.

LIST_INLINE void rem_node(node *n) { node *z = n->prev; node *x = n->next;

z->next = x; x->prev = z; n->next = NULL; n->prev = NULL; }

Thanks Arvin

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