Seeding from the 1.2 tree.

dll/possum/llist.h

@@ -0,0 +1,24 @@
+#ifndef LLIST_H
+#define LLIST_H 1
+
+struct lnode_struct {
+  void *object;
+  struct lnode_struct *prev, *next;
+};
+
+struct llist_struct {
+  struct lnode_struct *first, *last, *current;
+  size_t length, size;
+};
+
+typedef struct lnode_struct lnode;
+typedef struct llist_struct llist;
+
+llist *lmake(size_t size);
+int ldelete(llist *l);
+int lpush(llist *l, void *object);
+void *lindex(llist *l, size_t x);
+
+
+#endif
+