add alloc/dealloc functions for generic linked list

1 files changed, 34 insertions, 0 deletions

diff --git a/lichen.c b/lichen.c
index f20c1b3..e8c8e19 100644
--- a/lichen.c
+++ b/lichen.c
@@ -1,4 +1,6 @@
 #include "lichen.h"
+#include <stdio.h>
+#include <string.h>
 
 
 void li_xorshift32_seed(struct li_xorshift32_t *xor, uint32_t seed) {
@@ -18,3 +20,35 @@ uint32_t li_xorshift32(void *s) {
   // return just top 32 bits
   return x >> 32;
 }
+
+
+
+li_llnode_t * li_alloc_llnode() {
+  li_llnode_t *n = malloc(sizeof(li_llnode_t));
+  if (n == NULL) {
+    fprintf(stderr, "failed to allocate linked-list node\n");
+    return NULL;
+  } else {
+    n->tag = 0;
+    n->data = 0;
+    n->next = NULL;
+    return n;
+  }
+}
+
+
+li_llnode_t * li_copy_llnode(li_llnode_t *n) {
+  li_llnode_t *m = li_alloc_llnode();
+  if (m == NULL) {
+    return NULL;
+  }
+  memcpy(m, n, sizeof(li_llnode_t));
+  return m;
+}
+
+void li_free_llnode(li_llnode_t *n, void (*free_data)(void*)) {
+  if (n != NULL) {
+    free_data(n->data);
+  }
+  free(n);
+}