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

static inline void swap_items(sl_list *list, struct sl_list_item *pos, int dataindex)
{
	struct sl_list_item *i = list->first;
	int _i, size;
	void *tmp;

	for (_i =0, size = sllist_count(list); _i + SL_LIST_BUFLEN < size && i; _i += SL_LIST_BUFLEN)
		i = i->next;
	tmp = pos->data[dataindex];
	pos->data[dataindex] = i->data[size - _i];
	i->data[size - _i] = tmp;
}

int sllist_remove(sl_list *list, int (*fnc)(const void *a, const void *b), void *item)
{
	return sllist_n_remove(list, fnc, item, sllist_count(list));
}

int sllist_n_remove(sl_list *list, int (*fnc)(const void *, const void *), void *item, unsigned int n)
{
	int i, j, size, result;
	struct sl_list_item *item_ptr;

	for (i =result =0, size = sllist_count(list), item_ptr = list->first; i < size && item_ptr; i += SL_LIST_BUFLEN)
	{
		for (j =0; i+j < size && j < SL_LIST_BUFLEN; ++j)
		{
			if (!fnc(item_ptr->data[j], item))
				continue;
			if (i+j < size -1)
			{
				swap_items(list, item_ptr, j);
				--j;
			}
			--list->count;
			++result;
			if (!--n)
				return result;
		}
		item_ptr = item_ptr->next;
	}
	return result;
}