[RFC PATCH 04/13] upload-pack: make reachable() more generic

[Derrick Stolee <dstolee@microsoft.com>]

In anticipation of moving the reachable() method to commit-reach.c,
modify the prototype to be more generic to flags known outside of
upload-pack.c. Also rename 'want' to 'from' to make the statement
more clear outside of the context of haves/wants negotiation.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
---
 upload-pack.c | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/upload-pack.c b/upload-pack.c
index 87c6722ea5..95c56dc027 100644
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -28,7 +28,6 @@
 #define OUR_REF		(1u << 12)
 #define WANTED		(1u << 13)
 #define COMMON_KNOWN	(1u << 14)
-#define REACHABLE	(1u << 15)
 
 #define SHALLOW		(1u << 16)
 #define NOT_SHALLOW	(1u << 17)
@@ -334,36 +333,36 @@ static int got_oid(const char *hex, struct object_id *oid)
 	return 0;
 }
 
-static int reachable(struct commit *want)
+static int reachable(struct commit *from, int with_flag, int assign_flag)
 {
 	struct prio_queue work = { compare_commits_by_commit_date };
 
-	prio_queue_put(&work, want);
+	prio_queue_put(&work, from);
 	while (work.nr) {
 		struct commit_list *list;
 		struct commit *commit = prio_queue_get(&work);
 
-		if (commit->object.flags & THEY_HAVE) {
-			want->object.flags |= COMMON_KNOWN;
+		if (commit->object.flags & with_flag) {
+			from->object.flags |= assign_flag;
 			break;
 		}
 		if (!commit->object.parsed)
 			parse_object(&commit->object.oid);
-		if (commit->object.flags & REACHABLE)
+		if (commit->object.flags & TMP_MARK)
 			continue;
-		commit->object.flags |= REACHABLE;
+		commit->object.flags |= TMP_MARK;
 		if (commit->date < oldest_have)
 			continue;
 		for (list = commit->parents; list; list = list->next) {
 			struct commit *parent = list->item;
-			if (!(parent->object.flags & REACHABLE))
+			if (!(parent->object.flags & TMP_MARK))
 				prio_queue_put(&work, parent);
 		}
 	}
-	want->object.flags |= REACHABLE;
-	clear_commit_marks(want, REACHABLE);
+	from->object.flags |= TMP_MARK;
+	clear_commit_marks(from, TMP_MARK);
 	clear_prio_queue(&work);
-	return (want->object.flags & COMMON_KNOWN);
+	return (from->object.flags & assign_flag);
 }
 
 static int ok_to_give_up(void)
@@ -388,7 +387,7 @@ static int ok_to_give_up(void)
 			want_obj.objects[i].item->flags |= COMMON_KNOWN;
 			continue;
 		}
-		if (!reachable((struct commit *)want))
+		if (!reachable((struct commit *)want, THEY_HAVE, COMMON_KNOWN))
 			return 0;
 	}
 	return 1;
-- 
2.18.0.118.gd4f65b8d14