add list copy

1 files changed, 3 insertions, 3 deletions

diff --git a/lichen.h b/lichen.h
index 4bcd608..5f13e85 100644
--- a/lichen.h
+++ b/lichen.h
@@ -49,9 +49,9 @@ typedef struct li_ll_t {
 struct li_ll_t * li_alloc_ll();
 // free a linked list
 void li_free_ll(struct li_ll_t *list, void (*free_data)(void*));
-void li_ll_append(struct li_ll_t *list, void *data);
-void li_ll_prepend(struct li_ll_t *list, void *data);
-struct li_ll_t * li_copy_list(struct li_ll_t *list);
+int li_ll_append(struct li_ll_t *list, void *data);
+int li_ll_prepend(struct li_ll_t *list, void *data);
+int li_copy_list(struct li_ll_t **dst, struct li_ll_t *src, void *(*copy_data)(void*));