commit-reach: use size_t to track indices in get_reachable_subset()

Similar as with the preceding commit, adapt `get_reachable_subset()` so
that it tracks array indices via `size_t` instead of using signed
integers to fix a couple of -Wsign-compare warnings. Adapt callers
accordingly.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

bisect.c

@@ -780,10 +780,10 @@ static struct commit *get_commit_reference(struct repository *r,
 }
 
 static struct commit **get_bad_and_good_commits(struct repository *r,
-						int *rev_nr)
+						size_t *rev_nr)
 {
 	struct commit **rev;
-	int i, n = 0;
+	size_t i, n = 0;
 
 	ALLOC_ARRAY(rev, 1 + good_revs.nr);
 	rev[n++] = get_commit_reference(r, current_bad_oid);
@@ -887,7 +887,7 @@ static enum bisect_error check_merge_bases(int rev_nr, struct commit **rev, int
 	return res;
 }
 
-static int check_ancestors(struct repository *r, int rev_nr,
+static int check_ancestors(struct repository *r, size_t rev_nr,
 			   struct commit **rev, const char *prefix)
 {
 	struct strvec rev_argv = STRVEC_INIT;
@@ -922,7 +922,8 @@ static enum bisect_error check_good_are_ancestors_of_bad(struct repository *r,
 {
 	char *filename;
 	struct stat st;
-	int fd, rev_nr;
+	int fd;
+	size_t rev_nr;
 	enum bisect_error res = BISECT_OK;
 	struct commit **rev;
 

commit-reach.c

@@ -791,8 +791,8 @@ int can_all_from_reach_with_flag(struct object_array *from,
 				 timestamp_t min_generation)
 {
 	struct commit **list = NULL;
-	int i;
+	size_t i;
-	int nr_commits;
+	size_t nr_commits;
 	int result = 1;
 
 	ALLOC_ARRAY(list, from->nr);
@@ -944,8 +944,8 @@ int can_all_from_reach(struct commit_list *from, struct commit_list *to,
 	return result;
 }
 
-struct commit_list *get_reachable_subset(struct commit **from, int nr_from,
+struct commit_list *get_reachable_subset(struct commit **from, size_t nr_from,
-					 struct commit **to, int nr_to,
+					 struct commit **to, size_t nr_to,
 					 unsigned int reachable_flag)
 {
 	struct commit **item;

commit-reach.h

@@ -95,8 +95,8 @@ int can_all_from_reach(struct commit_list *from, struct commit_list *to,
  * This method uses the PARENT1 and PARENT2 flags during its operation,
  * so be sure these flags are not set before calling the method.
  */
-struct commit_list *get_reachable_subset(struct commit **from, int nr_from,
+struct commit_list *get_reachable_subset(struct commit **from, size_t nr_from,
-					 struct commit **to, int nr_to,
+					 struct commit **to, size_t nr_to,
 					 unsigned int reachable_flag);
 
 struct ahead_behind_count {

commit.c

@@ -778,11 +778,11 @@ static void clear_commit_marks_1(struct commit_list **plist,
 	}
 }
 
-void clear_commit_marks_many(int nr, struct commit **commit, unsigned int mark)
+void clear_commit_marks_many(size_t nr, struct commit **commit, unsigned int mark)
 {
 	struct commit_list *list = NULL;
 
-	while (nr--) {
+	for (size_t i = 0; i < nr; i++) {
 		clear_commit_marks_1(&list, *commit, mark);
 		commit++;
 	}

commit.h

@@ -210,7 +210,7 @@ struct commit *pop_most_recent_commit(struct commit_list **list,
 struct commit *pop_commit(struct commit_list **stack);
 
 void clear_commit_marks(struct commit *commit, unsigned int mark);
-void clear_commit_marks_many(int nr, struct commit **commit, unsigned int mark);
+void clear_commit_marks_many(size_t nr, struct commit **commit, unsigned int mark);
 
 
 enum rev_sort_order {

ref-filter.c

@@ -3041,7 +3041,7 @@ static void reach_filter(struct ref_array *array,
 			 struct commit_list **check_reachable,
 			 int include_reached)
 {
-	int i, old_nr;
+	size_t i, old_nr;
 	struct commit **to_clear;
 
 	if (!*check_reachable)

remote.c

@@ -1535,7 +1535,7 @@ static struct ref **tail_ref(struct ref **head)
 
 struct tips {
 	struct commit **tip;
-	int nr, alloc;
+	size_t nr, alloc;
 };
 
 static void add_to_tips(struct tips *tips, const struct object_id *oid)
@@ -1602,7 +1602,7 @@ static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***ds
 		const int reachable_flag = 1;
 		struct commit_list *found_commits;
 		struct commit **src_commits;
-		int nr_src_commits = 0, alloc_src_commits = 16;
+		size_t nr_src_commits = 0, alloc_src_commits = 16;
 		ALLOC_ARRAY(src_commits, alloc_src_commits);
 
 		for_each_string_list_item(item, &src_tag) {