add list copy

1 files changed, 25 insertions, 7 deletions

diff --git a/lichen.c b/lichen.c
index b0b0684..d7f0f82 100644
--- a/lichen.c
+++ b/lichen.c
@@ -77,10 +77,10 @@ void li_free_ll(struct li_ll_t *list, void (*free_data)(void*)) {
 }
 
 
-void li_ll_append(struct li_ll_t *list, void *data) {
+int li_ll_append(struct li_ll_t *list, void *data) {
   li_llnode_t *n = li_alloc_llnode();
   if (n == NULL) {
-    return;
+    return 1;
   }
   n->data = data;
   if (list->end != NULL) {
@@ -91,13 +91,14 @@ void li_ll_append(struct li_ll_t *list, void *data) {
     list->end = n;
   }
   list->count += 1;
+  return 0;
 }
 
 
-void li_ll_prepend(struct li_ll_t *list, void *data) {
+int li_ll_prepend(struct li_ll_t *list, void *data) {
   li_llnode_t *n = li_alloc_llnode();
   if (n == NULL) {
-    return;
+    return 1;
   }
   n->data = data;
   if (list->head != NULL) {
@@ -108,10 +109,27 @@ void li_ll_prepend(struct li_ll_t *list, void *data) {
     list->end = n;
   }
   list->count += 1;
+  return 0;
 }
 
 
-struct li_ll_t * li_copy_list(struct li_ll_t *list) {
-  list = list;
-  return NULL;
+int li_copy_list(struct li_ll_t **dst, struct li_ll_t *src, void *(*copy_data)(void*)) {
+  *dst = li_alloc_ll();
+  if (*dst == NULL) {
+    return 1;
+  }
+
+  (*dst)->tag = src->tag;
+
+  for (li_llnode_t *n = src->head; n != NULL; n = n->next) {
+    void *dup = copy_data(n->data);
+    if (dup == NULL) {
+      return 1;
+    }
+    if (li_ll_append(*dst, dup) != 0) {
+      return 1;
+    }
+  }
+
+  return 0;
 }