use struct sha1_array in diff_tree_combined()

Maintaining an array of hashes is easier using sha1_array than
open-coding it.  This patch also fixes a leak of the SHA1 array
in  diff_tree_combined_merge().

Signed-off-by: René Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 5 insertions, 9 deletions

diff --git a/submodule.c b/submodule.c
index 68c1ba90b9..788d5327ac 100644
--- a/submodule.c
+++ b/submodule.c
@@ -373,15 +373,11 @@ static void collect_submodules_from_diff(struct diff_queue_struct *q,
 
 static void commit_need_pushing(struct commit *commit, struct commit_list *parent, int *needs_pushing)
 {
-	const unsigned char (*parents)[20];
-	unsigned int i, n;
+	struct sha1_array parents = SHA1_ARRAY_INIT;
 	struct rev_info rev;
 
-	n = commit_list_count(parent);
-	parents = xmalloc(n * sizeof(*parents));
-
-	for (i = 0; i < n; i++) {
-		hashcpy((unsigned char *)(parents + i), parent->item->object.sha1);
+	while (parent) {
+		sha1_array_append(&parents, parent->item->object.sha1);
 		parent = parent->next;
 	}
 
@@ -389,9 +385,9 @@ static void commit_need_pushing(struct commit *commit, struct commit_list *paren
 	rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
 	rev.diffopt.format_callback = collect_submodules_from_diff;
 	rev.diffopt.format_callback_data = needs_pushing;
-	diff_tree_combined(commit->object.sha1, parents, n, 1, &rev);
+	diff_tree_combined(commit->object.sha1, &parents, 1, &rev);
 
-	free((void *)parents);
+	sha1_array_clear(&parents);
 }
 
 int check_submodule_needs_pushing(unsigned char new_sha1[20], const char *remotes_name)