From 6be010d9199df96deb3c120c19a5bd4591d9c596 Mon Sep 17 00:00:00 2001 From: Michael Brown Date: Sat, 24 Mar 2018 21:26:19 +0000 Subject: [list] Add list_is_first_entry() and list_is_last_entry() Signed-off-by: Michael Brown --- src/include/ipxe/list.h | 22 ++++++++++++++++++++++ src/tests/list_test.c | 21 +++++++++++++++++++++ 2 files changed, 43 insertions(+) diff --git a/src/include/ipxe/list.h b/src/include/ipxe/list.h index 274fb64c..8de25498 100644 --- a/src/include/ipxe/list.h +++ b/src/include/ipxe/list.h @@ -376,6 +376,28 @@ extern void extern_list_splice_tail_init ( struct list_head *list, member ); \ ( ( &prev->member == (head) ) ? NULL : prev ); } ) +/** + * Test if entry is first in a list + * + * @v entry List entry + * @v head List head + * @v member Name of list field within iterator's type + * @ret is_first Entry is first in the list + */ +#define list_is_first_entry( entry, head, member ) \ + ( (head)->next == &(entry)->member ) + +/** + * Test if entry is last in a list + * + * @v entry List entry + * @v head List head + * @v member Name of list field within iterator's type + * @ret is_last Entry is last in the list + */ +#define list_is_last_entry( entry, head, member ) \ + ( (head)->prev == &(entry)->member ) + /** * Iterate over a list * diff --git a/src/tests/list_test.c b/src/tests/list_test.c index f016a32e..d5b5c65d 100644 --- a/src/tests/list_test.c +++ b/src/tests/list_test.c @@ -419,6 +419,27 @@ static void list_test_exec ( void ) { ok ( list_prev_entry ( &list_tests[1], list, list ) == &list_tests[5] ); ok ( list_next_entry ( &list_tests[1], list, list ) == NULL ); + /* Test list_is_first_entry() and list_is_last_entry() */ + INIT_LIST_HEAD ( list ); + list_add_tail ( &list_tests[4].list, list ); + list_add_tail ( &list_tests[8].list, list ); + list_add_tail ( &list_tests[3].list, list ); + list_add_tail ( &list_tests[6].list, list ); + ok ( list_is_first_entry ( &list_tests[4], list, list ) ); + ok ( ! list_is_first_entry ( &list_tests[8], list, list ) ); + ok ( ! list_is_first_entry ( &list_tests[3], list, list ) ); + ok ( ! list_is_first_entry ( &list_tests[6], list, list ) ); + ok ( ! list_is_last_entry ( &list_tests[4], list, list ) ); + ok ( ! list_is_last_entry ( &list_tests[8], list, list ) ); + ok ( ! list_is_last_entry ( &list_tests[3], list, list ) ); + ok ( list_is_last_entry ( &list_tests[6], list, list ) ); + list_del ( &list_tests[4].list ); + ok ( list_is_first_entry ( &list_tests[8], list, list ) ); + list_del ( &list_tests[8].list ); + list_del ( &list_tests[6].list ); + ok ( list_is_first_entry ( &list_tests[3], list, list ) ); + ok ( list_is_last_entry ( &list_tests[3], list, list ) ); + /* Test list_for_each() */ INIT_LIST_HEAD ( list ); list_add_tail ( &list_tests[6].list, list ); -- cgit v1.2.3-55-g7522