#include <stdlib.h>
#include "sllist.h"

static inline void free_nexts(struct sl_list_item* i)
{
	struct sl_list_item *tmp = i->next;

	while (i->next)
	{
		tmp = i->next;
		i->next = tmp->next;
		free(tmp);
	}
}

void *sllist_popback(sl_list *list)
{
	void *data;
	struct sl_list_item *i = list->first;
	unsigned int pos = sllist_count(list) -1;

	while (pos > SL_LIST_BUFLEN)
	{
		i = i->next;
		pos -= SL_LIST_BUFLEN;
	}
	data = i->data[pos];
	if (pos == 0 && i->next)
		free_nexts(i);
	list->count--;
	return data;
}