commit.c: add in_merge_bases_many()

Similar to in_merge_bases(commit, other) that returns true when
commit is an ancestor (i.e. in the merge bases between the two) of
the other commit, in_merge_bases_many(commit, n_other, other[])
checks if commit is an ancestor of any of the other[] commits.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 18 insertions, 6 deletions

diff --git a/commit.c b/commit.c
index 4757e5058f..d12e7995cc 100644
--- a/commit.c
+++ b/commit.c
@@ -859,25 +859,37 @@ int is_descendant_of(struct commit *commit, struct commit_list *with_commit)
 }
 
 /*
- * Is "commit" an ancestor of (i.e. reachable from) the "reference"?
+ * Is "commit" an ancestor of one of the "references"?
  */
-int in_merge_bases(struct commit *commit, struct commit *reference)
+int in_merge_bases_many(struct commit *commit, int nr_reference, struct commit **reference)
 {
 	struct commit_list *bases;
-	int ret = 0;
+	int ret = 0, i;
 
-	if (parse_commit(commit) || parse_commit(reference))
+	if (parse_commit(commit))
 		return ret;
+	for (i = 0; i < nr_reference; i++)
+		if (parse_commit(reference[i]))
+			return ret;
 
-	bases = paint_down_to_common(commit, 1, &reference);
+	bases = paint_down_to_common(commit, nr_reference, reference);
 	if (commit->object.flags & PARENT2)
 		ret = 1;
 	clear_commit_marks(commit, all_flags);
-	clear_commit_marks(reference, all_flags);
+	for (i = 0; i < nr_reference; i++)
+		clear_commit_marks(reference[i], all_flags);
 	free_commit_list(bases);
 	return ret;
 }
 
+/*
+ * Is "commit" an ancestor of (i.e. reachable from) the "reference"?
+ */
+int in_merge_bases(struct commit *commit, struct commit *reference)
+{
+	return in_merge_bases_many(commit, 1, &reference);
+}
+
 struct commit_list *reduce_heads(struct commit_list *heads)
 {
 	struct commit_list *p;