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[list] Add list_is_first_entry() and list_is_last_entry()

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2018-03-24 21:26:19 +00:00
parent ac4fbd47ae
commit 6be010d919
2 changed files with 43 additions and 0 deletions
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22
src/include/ipxe/list.h
View File

@@ -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
*

21
src/tests/list_test.c
View File

@@ -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 );