1 files changed, 28 insertions, 0 deletions
diff --git a/commit.c b/commit.c
index 2527f15d9d..efd0c02683 100644
--- a/commit.c
+++ b/commit.c
@@ -1984,3 +1984,31 @@ 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_init(struct commit_stack *stack)
+{
+	stack->items = NULL;
+	stack->nr = stack->alloc = 0;
+}
+
+void commit_stack_grow(struct commit_stack *stack, size_t extra)
+{
+	ALLOC_GROW(stack->items, st_add(stack->nr, extra), stack->alloc);
+}
+
+void commit_stack_push(struct commit_stack *stack, struct commit *commit)
+{
+	commit_stack_grow(stack, 1);
+	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(stack->items);
+	commit_stack_init(stack);
+}