Lists: Replaced replace_node() by update_node() which is the only use of that function.

This commit is contained in:
Maria Matejka 2019-08-19 14:36:51 +02:00
parent e26a5195dd
commit 9ac13d7af2
3 changed files with 17 additions and 26 deletions

View file

@ -153,32 +153,20 @@ rem_node(node *n)
}
/**
* replace_node - replace a node in a list with another one
* @old: node to be removed
* @new: node to be inserted
* update_node - update node after calling realloc on it
* @n: node to be updated
*
* Replaces node @old in the list it's linked in with node @new. Node
* @old may be a copy of the original node, which is not accessed
* through the list. The function could be called with @old == @new,
* which just fixes neighbors' pointers in the case that the node
* was reallocated.
* Fixes neighbor pointers.
*/
LIST_INLINE void
replace_node(node *old, node *new)
update_node(node *n)
{
EXPENSIVE_CHECK(check_list(NULL, old));
ASSUME(n->next->prev == n->prev->next);
if (old != new)
{
ASSUME(new->prev == NULL);
ASSUME(new->next == NULL);
}
n->next->prev = n;
n->prev->next = n;
old->next->prev = new;
old->prev->next = new;
new->prev = old->prev;
new->next = old->next;
EXPENSIVE_CHECK(check_list(NULL, n));
}
/**

View file

@ -222,26 +222,29 @@ t_remove_node(void)
}
static int
t_replace_node(void)
t_update_node(void)
{
node head, inside, tail;
init_list_();
fill_list();
replace_node(&nodes[0], &head);
head = nodes[0];
update_node(&head);
bt_assert(l.head == &head);
bt_assert(head.prev == NODE &l.head);
bt_assert(head.next == &nodes[1]);
bt_assert(nodes[1].prev == &head);
replace_node(&nodes[MAX_NUM/2], &inside);
inside = nodes[MAX_NUM/2];
update_node(&inside);
bt_assert(nodes[MAX_NUM/2-1].next == &inside);
bt_assert(nodes[MAX_NUM/2+1].prev == &inside);
bt_assert(inside.prev == &nodes[MAX_NUM/2-1]);
bt_assert(inside.next == &nodes[MAX_NUM/2+1]);
replace_node(&nodes[MAX_NUM-1], &tail);
tail = nodes[MAX_NUM-1];
update_node(&tail);
bt_assert(l.tail == &tail);
bt_assert(tail.prev == &nodes[MAX_NUM-2]);
bt_assert(tail.next == NODE &l.null);
@ -280,7 +283,7 @@ main(int argc, char *argv[])
bt_test_suite(t_add_head, "Adding nodes to head of list");
bt_test_suite(t_insert_node, "Inserting nodes to list");
bt_test_suite(t_remove_node, "Removing nodes from list");
bt_test_suite(t_replace_node, "Replacing nodes in list");
bt_test_suite(t_update_node, "Updating nodes in list");
bt_test_suite(t_add_tail_list, "At the tail of a list adding the another list");
return bt_exit_value();

View file

@ -388,7 +388,7 @@ mb_realloc(void *m, unsigned size)
struct mblock *b = SKIP_BACK(struct mblock, data, m);
b = xrealloc(b, sizeof(struct mblock) + size);
replace_node(&b->r.n, &b->r.n);
update_node(&b->r.n);
b->size = size;
return b->data;
}