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basic: add LIST_INSERT_BEFORE

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Similar in function to LIST_INSERT_AFTER, this will insert a new element
into the list before the specified position. If the specified position
is NULL, the element is added as the tail of the list.
This commit is contained in:
Alex Crawford
2015-08-04 03:23:43 -07:00
parent 58a2e9acd8
commit dbe465c93e
2 changed files with 70 additions and 0 deletions
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src/test/test-list.c
+44
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@@ -99,6 +99,50 @@ int main(int argc, const char *argv[]) {
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, 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]));