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list: add LIST_CLEAR() helper that empties the list

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This commit is contained in:
David Tardon 2023-08-09 16:35:08 +02:00
parent c0083c9ce0
commit d327b7752f
2 changed files with 37 additions and 0 deletions
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12
src/basic/list.h
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@ -192,6 +192,18 @@
_p; \
})
#define LIST_CLEAR(name, head, free_func) \
_LIST_CLEAR(name, head, free_func, UNIQ_T(elem, UNIQ))
/* Clear the list, destroing each element with free_func */
#define _LIST_CLEAR(name, head, free_func, elem) \
({ \
typeof(head) elem; \
while ((elem = LIST_POP(name, head))) \
free_func(elem); \
head; \
})
/* Now include "macro.h", because we want our definition of assert() which the macros above use. We include
* it down here instead of up top, since macro.h pulls in log.h which in turn needs our own definitions. */
#include "macro.h"

25
src/test/test-list.c
View File

@ -1,5 +1,6 @@
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "alloc-util.h"
#include "list.h"
int main(int argc, const char *argv[]) {
@ -254,5 +255,29 @@ int main(int argc, const char *argv[]) {
assert_se(LIST_POP(item_list, head) == items + 0);
assert_se(LIST_POP(item_list, head) == NULL);
/* No-op on an empty list */
LIST_CLEAR(item_list, head, free);
/* A non-empty list is cleared */
assert_se(LIST_PREPEND(item_list, head, new0(list_item, 1)));
assert_se(LIST_PREPEND(item_list, head, new0(list_item, 1)));
LIST_CLEAR(item_list, head, free);
assert_se(head == NULL);
/* A list can be cleared partially */
assert_se(LIST_PREPEND(item_list, head, new0(list_item, 1)));
assert_se(LIST_PREPEND(item_list, head, new0(list_item, 1)));
assert_se(LIST_PREPEND(item_list, head, items + 0) == items + 0);
LIST_CLEAR(item_list, head->item_list_next, free);
assert_se(head == items + 0);
assert_se(head->item_list_next == NULL);
return 0;
}