revision: export commit_stack

Dynamic arrays of commit pointers are used in several places.  Some of
them use a custom struct to hold array, item count and capacity, others
have them as separate variables linked by a common name part.

Pick one succinct, clean implementation -- commit_stack -- and convert
the different variants to it to reduce code duplication.

Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/commit.c b/commit.c
index 709c9eed58..f2edafa49c 100644
--- a/commit.c
+++ b/commit.c
@@ -1981,3 +1981,20 @@ int run_commit_hook(int editor_is_used, const char *index_file,
 	opt.invoked_hook = invoked_hook;
 	return run_hooks_opt(the_repository, name, &opt);
 }
+
+void commit_stack_push(struct commit_stack *stack, struct commit *commit)
+{
+	ALLOC_GROW(stack->items, stack->nr + 1, stack->alloc);
+	stack->items[stack->nr++] = commit;
+}
+
+struct commit *commit_stack_pop(struct commit_stack *stack)
+{
+	return stack->nr ? stack->items[--stack->nr] : NULL;
+}
+
+void commit_stack_clear(struct commit_stack *stack)
+{
+	FREE_AND_NULL(stack->items);
+	stack->nr = stack->alloc = 0;
+}