X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2Fscheme%2Fao_scheme_cons.c;h=02512e15f895ab36aa46a2dbf1ccb9aa56df4d7f;hb=b72638e60b6636b479b79bbf0047cf7409f58820;hp=03dad956d6561f59e31f4e79bc3004def0c3e2a9;hpb=195cbeec19a6a44f309a9040d727d37fe4e2ec97;p=fw%2Faltos

diff --git a/src/scheme/ao_scheme_cons.c b/src/scheme/ao_scheme_cons.c
index 03dad956..02512e15 100644
--- a/src/scheme/ao_scheme_cons.c
+++ b/src/scheme/ao_scheme_cons.c
@@ -112,7 +112,7 @@ ao_scheme_cons_cdr(struct ao_scheme_cons *cons)
 	if (cdr == AO_SCHEME_NIL)
 		return NULL;
 	if (ao_scheme_poly_type(cdr) != AO_SCHEME_CONS) {
-		(void) ao_scheme_error(AO_SCHEME_INVALID, "improper list");
+		(void) ao_scheme_error(AO_SCHEME_INVALID, "improper cdr %v", cdr);
 		return NULL;
 	}
 	return ao_scheme_poly_cons(cdr);
@@ -124,6 +124,42 @@ ao_scheme__cons(ao_poly car, ao_poly cdr)
 	return ao_scheme_cons_poly(ao_scheme_cons_cons(car, cdr));
 }
 
+struct ao_scheme_cons *
+ao_scheme_cons_copy(struct ao_scheme_cons *cons)
+{
+	struct ao_scheme_cons	*head = NULL;
+	struct ao_scheme_cons	*tail = NULL;
+
+	while (cons) {
+		struct ao_scheme_cons	*new;
+		ao_poly cdr;
+
+		ao_scheme_cons_stash(0, cons);
+		ao_scheme_cons_stash(1, head);
+		ao_scheme_poly_stash(0, ao_scheme_cons_poly(tail));
+		new = ao_scheme_alloc(sizeof (struct ao_scheme_cons));
+		cons = ao_scheme_cons_fetch(0);
+		head = ao_scheme_cons_fetch(1);
+		tail = ao_scheme_poly_cons(ao_scheme_poly_fetch(0));
+		if (!new)
+			return AO_SCHEME_NIL;
+		new->car = cons->car;
+		new->cdr = AO_SCHEME_NIL;
+		if (!head)
+			head = new;
+		else
+			tail->cdr = ao_scheme_cons_poly(new);
+		tail = new;
+		cdr = cons->cdr;
+		if (ao_scheme_poly_type(cdr) != AO_SCHEME_CONS) {
+			tail->cdr = cdr;
+			break;
+		}
+		cons = ao_scheme_poly_cons(cdr);
+	}
+	return head;
+}
+
 void
 ao_scheme_cons_free(struct ao_scheme_cons *cons)
 {
@@ -195,7 +231,7 @@ ao_scheme_cons_length(struct ao_scheme_cons *cons)
 	int	len = 0;
 	while (cons) {
 		len++;
-		cons = ao_scheme_poly_cons(cons->cdr);
+		cons = ao_scheme_cons_cdr(cons);
 	}
 	return len;
 }