[PATCH 22/35] attr.c: introduce empty_attr_check_elems()

[Stefan Beller <sbeller@google.com>]

From: Junio C Hamano <gitster@pobox.com>

One codepath needs to just empty the git_attr_check_elem array in
the git_attr_check structure, without releasing the entire resource.
Introduce a helper to do so and rewrite git_attr_check_clear() using
it.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 attr.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/attr.c b/attr.c
index 48460d2..5bb925d 100644
--- a/attr.c
+++ b/attr.c
@@ -746,6 +746,14 @@ static int attr_check_is_dynamic(const struct git_attr_check *check)
 	return (void *)(check->check) != (void *)(check + 1);
 }
 
+static void empty_attr_check_elems(struct git_attr_check *check)
+{
+	if (!attr_check_is_dynamic(check))
+		die("BUG: emptying a statically initialized git_attr_check");
+	check->check_nr = 0;
+	check->finalized = 0;
+}
+
 /*
  * Collect attributes for path into the array pointed to by
  * check_all_attr.  If check is not NULL, only attributes in
@@ -912,12 +920,11 @@ struct git_attr_check_elem *git_attr_check_append(struct git_attr_check *check,
 
 void git_attr_check_clear(struct git_attr_check *check)
 {
+	empty_attr_check_elems(check);
 	if (!attr_check_is_dynamic(check))
 		die("BUG: clearing a statically initialized git_attr_check");
 	free(check->check);
-	check->check_nr = 0;
 	check->check_alloc = 0;
-	check->finalized = 0;
 }
 
 void git_attr_check_free(struct git_attr_check *check)
-- 
2.10.1.469.g00a8914