altos/lisp: add length, pack, unpack and flush

lots more builtins

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/lisp/ao_lisp_cons.c b/src/lisp/ao_lisp_cons.c
index cd8a8d1d..b75ffaa0 100644
--- a/src/lisp/ao_lisp_cons.c
+++ b/src/lisp/ao_lisp_cons.c
@@ -107,3 +107,14 @@ ao_lisp_cons_patom(ao_poly c)
 		cons = ao_lisp_poly_cons(cons->cdr);
 	}
 }
+
+int
+ao_lisp_cons_length(struct ao_lisp_cons *cons)
+{
+	int	len = 0;
+	while (cons) {
+		len++;
+		cons = ao_lisp_poly_cons(cons->cdr);
+	}
+	return len;
+}