Re: Generic list push/pop

[William Lee Irwin III <wli@holomorphy.com>]

On Sun, Aug 18, 2002 at 09:21:41PM +0200, Daniel Phillips wrote:
> I took a run at writing generic single-linked list push and pop macros, to be 
> used in the form:

Dear gawd, I've gone blind.

How's this look?


Cheers,
Bill


struct slist
{
	struct slist *next;
};


static inline void slist_add(struct slist *head, struct slist *elem)
{
	elem->next = head->next;
	head->next = elem;
}

#define slist_push(head, elem)	slist_add(head, elem)

static inline struct slist *slist_pop(struct slist *head)
{
	struct slist *elem = head->next;

	if (elem) {
		head->next = elem->next;
		elem->next = NULL;
	}
	return elem;
}

static inline int slist_remove(struct slist *head, struct slist *elem)
{
	struct slist *curr, *prev;

	for (prev = head, curr = head->next; curr; prev = curr, curr = curr->next)
		if (curr == head) {
			prev->next = curr->next;
			curr->next = NULL;
			return 1;
		}

	return 0;
}