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Systemd/src/test/test-list.c
Michael Olbrich 5076f4219e list: LIST_INSERT_BEFORE: update head if necessary (#4261) 
If the new item is inserted before the first item in the list, then the
head must be updated as well.
Add a test to the list unit test to check for this.
2016-10-04 16:15:37 +02:00

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/***
This file is part of systemd
Copyright 2013 Jan Janssen
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include "list.h"
#include "util.h"
int main(int argc, const char *argv[]) {
size_t i;
typedef struct list_item {
LIST_FIELDS(struct list_item, item);
} list_item;
LIST_HEAD(list_item, head);
list_item items[4];
list_item *cursor;
LIST_HEAD_INIT(head);
assert_se(head == NULL);
for (i = 0; i < ELEMENTSOF(items); i++) {
LIST_INIT(item, &items[i]);
assert_se(LIST_JUST_US(item, &items[i]));
LIST_PREPEND(item, head, &items[i]);
}
i = 0;
LIST_FOREACH_OTHERS(item, cursor, &items[2]) {
i++;
assert_se(cursor != &items[2]);
}
assert_se(i == ELEMENTSOF(items)-1);
i = 0;
LIST_FOREACH_OTHERS(item, cursor, &items[0]) {
i++;
assert_se(cursor != &items[0]);
}
assert_se(i == ELEMENTSOF(items)-1);
i = 0;
LIST_FOREACH_OTHERS(item, cursor, &items[3]) {
i++;
assert_se(cursor != &items[3]);
}
assert_se(i == ELEMENTSOF(items)-1);
assert_se(!LIST_JUST_US(item, head));
assert_se(items[0].item_next == NULL);
assert_se(items[1].item_next == &items[0]);
assert_se(items[2].item_next == &items[1]);
assert_se(items[3].item_next == &items[2]);
assert_se(items[0].item_prev == &items[1]);
assert_se(items[1].item_prev == &items[2]);
assert_se(items[2].item_prev == &items[3]);
assert_se(items[3].item_prev == NULL);
LIST_FIND_HEAD(item, &items[0], cursor);
assert_se(cursor == &items[3]);
LIST_FIND_TAIL(item, &items[3], cursor);
assert_se(cursor == &items[0]);
LIST_REMOVE(item, head, &items[1]);
assert_se(LIST_JUST_US(item, &items[1]));
assert_se(items[0].item_next == NULL);
assert_se(items[2].item_next == &items[0]);
assert_se(items[3].item_next == &items[2]);
assert_se(items[0].item_prev == &items[2]);
assert_se(items[2].item_prev == &items[3]);
assert_se(items[3].item_prev == NULL);
LIST_INSERT_AFTER(item, head, &items[3], &items[1]);
assert_se(items[0].item_next == NULL);
assert_se(items[2].item_next == &items[0]);
assert_se(items[1].item_next == &items[2]);
assert_se(items[3].item_next == &items[1]);
assert_se(items[0].item_prev == &items[2]);
assert_se(items[2].item_prev == &items[1]);
assert_se(items[1].item_prev == &items[3]);
assert_se(items[3].item_prev == NULL);
LIST_REMOVE(item, head, &items[1]);
assert_se(LIST_JUST_US(item, &items[1]));
assert_se(items[0].item_next == NULL);
assert_se(items[2].item_next == &items[0]);
assert_se(items[3].item_next == &items[2]);
assert_se(items[0].item_prev == &items[2]);
assert_se(items[2].item_prev == &items[3]);
assert_se(items[3].item_prev == NULL);
LIST_INSERT_BEFORE(item, head, &items[2], &items[1]);
assert_se(items[0].item_next == NULL);
assert_se(items[2].item_next == &items[0]);
assert_se(items[1].item_next == &items[2]);
assert_se(items[3].item_next == &items[1]);
assert_se(items[0].item_prev == &items[2]);
assert_se(items[2].item_prev == &items[1]);
assert_se(items[1].item_prev == &items[3]);
assert_se(items[3].item_prev == NULL);
LIST_REMOVE(item, head, &items[0]);
assert_se(LIST_JUST_US(item, &items[0]));
assert_se(items[2].item_next == NULL);
assert_se(items[1].item_next == &items[2]);
assert_se(items[3].item_next == &items[1]);
assert_se(items[2].item_prev == &items[1]);
assert_se(items[1].item_prev == &items[3]);
assert_se(items[3].item_prev == NULL);
LIST_INSERT_BEFORE(item, head, &items[3], &items[0]);
assert_se(items[2].item_next == NULL);
assert_se(items[1].item_next == &items[2]);
assert_se(items[3].item_next == &items[1]);
assert_se(items[0].item_next == &items[3]);
assert_se(items[2].item_prev == &items[1]);
assert_se(items[1].item_prev == &items[3]);
assert_se(items[3].item_prev == &items[0]);
assert_se(items[0].item_prev == NULL);
assert_se(head == &items[0]);
LIST_REMOVE(item, head, &items[0]);
assert_se(LIST_JUST_US(item, &items[0]));
assert_se(items[2].item_next == NULL);
assert_se(items[1].item_next == &items[2]);
assert_se(items[3].item_next == &items[1]);
assert_se(items[2].item_prev == &items[1]);
assert_se(items[1].item_prev == &items[3]);
assert_se(items[3].item_prev == NULL);
LIST_INSERT_BEFORE(item, head, NULL, &items[0]);
assert_se(items[0].item_next == NULL);
assert_se(items[2].item_next == &items[0]);
assert_se(items[1].item_next == &items[2]);
assert_se(items[3].item_next == &items[1]);
assert_se(items[0].item_prev == &items[2]);
assert_se(items[2].item_prev == &items[1]);
assert_se(items[1].item_prev == &items[3]);
assert_se(items[3].item_prev == NULL);
LIST_REMOVE(item, head, &items[0]);
assert_se(LIST_JUST_US(item, &items[0]));
assert_se(items[2].item_next == NULL);
assert_se(items[1].item_next == &items[2]);
assert_se(items[3].item_next == &items[1]);
assert_se(items[2].item_prev == &items[1]);
assert_se(items[1].item_prev == &items[3]);
assert_se(items[3].item_prev == NULL);
LIST_REMOVE(item, head, &items[1]);
assert_se(LIST_JUST_US(item, &items[1]));
assert_se(items[2].item_next == NULL);
assert_se(items[3].item_next == &items[2]);
assert_se(items[2].item_prev == &items[3]);
assert_se(items[3].item_prev == NULL);
LIST_REMOVE(item, head, &items[2]);
assert_se(LIST_JUST_US(item, &items[2]));
assert_se(LIST_JUST_US(item, head));
LIST_REMOVE(item, head, &items[3]);
assert_se(LIST_JUST_US(item, &items[3]));
assert_se(head == NULL);
for (i = 0; i < ELEMENTSOF(items); i++) {
assert_se(LIST_JUST_US(item, &items[i]));
LIST_APPEND(item, head, &items[i]);
}
assert_se(!LIST_JUST_US(item, head));
assert_se(items[0].item_next == &items[1]);
assert_se(items[1].item_next == &items[2]);
assert_se(items[2].item_next == &items[3]);
assert_se(items[3].item_next == NULL);
assert_se(items[0].item_prev == NULL);
assert_se(items[1].item_prev == &items[0]);
assert_se(items[2].item_prev == &items[1]);
assert_se(items[3].item_prev == &items[2]);
for (i = 0; i < ELEMENTSOF(items); i++)
LIST_REMOVE(item, head, &items[i]);
assert_se(head == NULL);
return 0;
}
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