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| author | Michael Brown | 2024-02-14 17:01:43 +0100 |
|---|---|---|
| committer | Michael Brown | 2024-02-14 17:25:21 +0100 |
| commit | 88b291d647686ac686a5614fdd7be92b48747360 (patch) | |
| tree | a480bfc224f2b43b02bd588becaa1ce424987eef | |
| parent | [build] Fix build failures with older versions of gcc (diff) | |
| download | ipxe-88b291d647686ac686a5614fdd7be92b48747360.tar.gz ipxe-88b291d647686ac686a5614fdd7be92b48747360.tar.xz ipxe-88b291d647686ac686a5614fdd7be92b48747360.zip | |
[list] Add list_is_head_entry()
Signed-off-by: Michael Brown <mcb30@ipxe.org>
| -rw-r--r-- | src/include/ipxe/list.h | 11 | ||||
| -rw-r--r-- | src/tests/list_test.c | 16 |
2 files changed, 27 insertions, 0 deletions
diff --git a/src/include/ipxe/list.h b/src/include/ipxe/list.h index 8de25498..53edfc9f 100644 --- a/src/include/ipxe/list.h +++ b/src/include/ipxe/list.h @@ -399,6 +399,17 @@ extern void extern_list_splice_tail_init ( struct list_head *list, ( (head)->prev == &(entry)->member ) /** + * Test if entry is the list head + * + * @v entry List entry + * @v head List head + * @v member Name of list field within iterator's type + * @ret is_head Entry is the list head + */ +#define list_is_head_entry( entry, head, member ) \ + ( (head) == &(entry)->member ) + +/** * Iterate over a list * * @v pos Iterator diff --git a/src/tests/list_test.c b/src/tests/list_test.c index d5b5c65d..f18c63f2 100644 --- a/src/tests/list_test.c +++ b/src/tests/list_test.c @@ -440,6 +440,22 @@ static void list_test_exec ( void ) { ok ( list_is_first_entry ( &list_tests[3], list, list ) ); ok ( list_is_last_entry ( &list_tests[3], list, list ) ); + /* Test list_is_head_entry() */ + INIT_LIST_HEAD ( list ); + list_add_tail ( &list_tests[1].list, list ); + list_add_tail ( &list_tests[6].list, list ); + list_add_tail ( &list_tests[8].list, list ); + ok ( list_is_head_entry ( list_entry ( list, typeof ( *pos ), list ), + list, list ) ); + ok ( ! list_is_head_entry ( &list_tests[1], list, list ) ); + ok ( ! list_is_head_entry ( &list_tests[6], list, list ) ); + ok ( ! list_is_head_entry ( &list_tests[8], list, list ) ); + list_for_each_entry ( pos, list, list ) { + ok ( list_contains_entry ( pos, list, list ) ); + ok ( ! list_is_head_entry ( pos, list, list ) ); + } + ok ( list_is_head_entry ( pos, list, list ) ); + /* Test list_for_each() */ INIT_LIST_HEAD ( list ); list_add_tail ( &list_tests[6].list, list ); |