refactor code to use LIST from sys/queue.h

It's now easier and more natural to work with the code. :-P

1 files changed, 4 insertions, 6 deletions

diff --git a/eval.h b/eval.h
index eab225d..25a2f33 100644
--- a/eval.h
+++ b/eval.h
@@ -1,12 +1,10 @@
 #ifndef EVAL_H
 #define EVAL_H
 
-struct list;
+struct atom;
+struct env;
 
-struct list *eval(struct list *expr);
-struct list *eval_str(const char *expr);
-
-struct list *eval_env(struct list *expr, struct list *env);
-struct list *eval_str_env(const char *expr, struct list *env);
+struct atom *eval(struct atom *expr, struct env *env);
+struct atom *eval_str(const char *expr, struct env *env);
 
 #endif