gri3-wm/tests/swap.c

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5.3 KiB
C
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/*
* vim:ts=4:sw=4:expandtab
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdbool.h>
#include <stdint.h>
#include "queue.h"
struct obj {
int abc;
TAILQ_ENTRY(obj) entry;
};
TAILQ_HEAD(objhead, obj) head;
void dump() {
struct obj *e;
printf("dump:\n");
e = TAILQ_FIRST(&head);
printf("first: %d\n", e->abc);
e = TAILQ_LAST(&head, objhead);
printf("last: %d\n", e->abc);
TAILQ_FOREACH (e, &head, entry) {
printf(" %d\n", e->abc);
}
printf("again, but reverse:\n");
TAILQ_FOREACH_REVERSE (e, &head, objhead, entry) {
printf(" %d\n", e->abc);
}
printf("done\n\n");
}
#define TAILQ_SWAP(first, second, head, field) \
do { \
*((first)->field.tqe_prev) = (second); \
(second)->field.tqe_prev = (first)->field.tqe_prev; \
(first)->field.tqe_prev = &((second)->field.tqe_next); \
(first)->field.tqe_next = (second)->field.tqe_next; \
if ((second)->field.tqe_next) \
(second)->field.tqe_next->field.tqe_prev = &((first)->field.tqe_next); \
(second)->field.tqe_next = first; \
if ((head)->tqh_last == &((second)->field.tqe_next)) \
(head)->tqh_last = &((first)->field.tqe_next); \
} while (0)
void _TAILQ_SWAP(struct obj *first, struct obj *second, struct objhead *head) {
struct obj **tqe_prev = first->entry.tqe_prev;
*tqe_prev = second;
second->entry.tqe_prev = first->entry.tqe_prev;
first->entry.tqe_prev = &(second->entry.tqe_next);
first->entry.tqe_next = second->entry.tqe_next;
if (second->entry.tqe_next) {
struct obj *tqe_next = second->entry.tqe_next;
tqe_next->entry.tqe_prev = &(first->entry.tqe_next);
}
second->entry.tqe_next = first;
if (head->tqh_last == &(second->entry.tqe_next))
head->tqh_last = &(first->entry.tqe_next);
}
int main() {
printf("hello\n");
TAILQ_INIT(&head);
struct obj first;
first.abc = 123;
struct obj second;
second.abc = 456;
struct obj third;
third.abc = 789;
struct obj fourth;
fourth.abc = 999;
struct obj fifth;
fifth.abc = 5555;
/*
* ************************************************
*/
printf("swapping first two elements:\n");
TAILQ_INSERT_TAIL(&head, &first, entry);
TAILQ_INSERT_TAIL(&head, &second, entry);
TAILQ_INSERT_TAIL(&head, &third, entry);
dump();
TAILQ_SWAP(&first, &second, &head, entry);
dump();
/*
* ************************************************
*/
printf("swapping last two elements:\n");
TAILQ_INIT(&head);
TAILQ_INSERT_TAIL(&head, &first, entry);
TAILQ_INSERT_TAIL(&head, &second, entry);
TAILQ_INSERT_TAIL(&head, &third, entry);
dump();
TAILQ_SWAP(&second, &third, &head, entry);
dump();
/*
* ************************************************
*/
printf("longer list:\n");
TAILQ_INIT(&head);
TAILQ_INSERT_TAIL(&head, &first, entry);
TAILQ_INSERT_TAIL(&head, &second, entry);
TAILQ_INSERT_TAIL(&head, &third, entry);
TAILQ_INSERT_TAIL(&head, &fourth, entry);
dump();
TAILQ_SWAP(&first, &second, &head, entry);
dump();
/*
* ************************************************
*/
printf("longer list 2:\n");
TAILQ_INIT(&head);
TAILQ_INSERT_TAIL(&head, &first, entry);
TAILQ_INSERT_TAIL(&head, &second, entry);
TAILQ_INSERT_TAIL(&head, &third, entry);
TAILQ_INSERT_TAIL(&head, &fourth, entry);
dump();
TAILQ_SWAP(&second, &third, &head, entry);
dump();
/*
* ************************************************
*/
printf("longer list, swap, then insert:\n");
TAILQ_INIT(&head);
TAILQ_INSERT_TAIL(&head, &first, entry);
TAILQ_INSERT_TAIL(&head, &second, entry);
TAILQ_INSERT_TAIL(&head, &third, entry);
TAILQ_INSERT_TAIL(&head, &fourth, entry);
dump();
TAILQ_SWAP(&second, &third, &head, entry);
dump();
TAILQ_INSERT_AFTER(&head, &third, &fifth, entry);
dump();
/*
* ************************************************
*/
printf("longer list, swap, then append:\n");
TAILQ_INIT(&head);
TAILQ_INSERT_TAIL(&head, &first, entry);
TAILQ_INSERT_TAIL(&head, &second, entry);
TAILQ_INSERT_TAIL(&head, &third, entry);
TAILQ_INSERT_TAIL(&head, &fourth, entry);
dump();
TAILQ_SWAP(&second, &third, &head, entry);
dump();
TAILQ_INSERT_TAIL(&head, &fifth, entry);
dump();
/*
* ************************************************
*/
printf("longer list, swap, then remove:\n");
TAILQ_INIT(&head);
TAILQ_INSERT_TAIL(&head, &first, entry);
TAILQ_INSERT_TAIL(&head, &second, entry);
TAILQ_INSERT_TAIL(&head, &third, entry);
TAILQ_INSERT_TAIL(&head, &fourth, entry);
dump();
TAILQ_SWAP(&second, &third, &head, entry);
dump();
TAILQ_REMOVE(&head, &second, entry);
dump();
}