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/* vim: set ts=4 sw=4 ai:
* stq.c -- singly linked tail queue implementation derived from NetBSD's queue.h
*/
#include <stdlib.h>
#include "stq.h"
struct stqh *stq_new(void)
{
struct stqh *hd;
hd = malloc(sizeof(*hd));
if (hd != NULL)
stq_init(hd);
return hd;
}
struct stqe *stq_elem_new(void *data)
{
struct stqe *e;
e = malloc(sizeof(*e));
if (e != NULL)
e->data = data;
return e;
}
void stq_insert_head(struct stqh *hd, struct stqe *e)
{
if ((e->next = hd->first) == NULL)
hd->last = &e->next;
hd->first = e;
}
void stq_insert_tail(struct stqh *hd, struct stqe *e)
{
e->next = NULL;
*hd->last = e;
hd->last = &e->next;
}
void stq_insert_after(struct stqh *hd, struct stqe *e, struct stqe *n)
{
if ((n->next = e->next) == NULL)
hd->last = &n->next;
e->next = n;
}
void stq_remove_head(struct stqh *hd)
{
if ((hd->first = hd->first->next) == NULL)
hd->last = &hd->first;
}
void stq_remove(struct stqh *hd, struct stqe *e)
{
if (hd->first == (e)) {
if ((hd->first = hd->first->next) == NULL)
hd->last = &hd->first;
}
else {
struct stqe *cur = hd->first;
while (cur->next != (e))
cur = cur->next;
if ((cur->next = cur->next->next) == NULL)
hd->last = &cur->next;
}
}
void stq_concat(struct stqh *hd1, struct stqh *hd2)
{
if (!(hd2->first == NULL)) {
*hd1->last = hd2->first;
hd1->last = hd2->last;
hd2->first = NULL;
hd2->last = &hd2->first;
}
}
void stq_cleanup(struct stqh *hd, void (*func)(void *))
{
struct stqe *e, *t;
stq_foreach_safe(e, hd, t) {
stq_remove(hd, e);
if (func)
func(e->data);
free(e);
}
}
struct stqe *stq_find_from_data(struct stqh *hd, const void *data, int (*cmp)(const void *, const void *))
{
struct stqe *e;
if (hd && stq_empty(hd))
stq_foreach(e, hd)
if (e->data && cmp(e->data, data) == 0)
return e;
return NULL;
}
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