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-rw-r--r--src/include/ipxe/list.h22
-rw-r--r--src/tests/list_test.c21
2 files changed, 43 insertions, 0 deletions
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
@@ -377,6 +377,28 @@ extern void extern_list_splice_tail_init ( struct list_head *list,
( ( &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
*
* @v pos Iterator
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 );