altos/scheme: add list-copy

A lot easier as a built-in; the obvious scheme version is recursive.

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

1 files changed, 13 insertions, 0 deletions

diff --git a/src/scheme/ao_scheme_builtin.c b/src/scheme/ao_scheme_builtin.c
index 397ce032..6f9e1390 100644
--- a/src/scheme/ao_scheme_builtin.c
+++ b/src/scheme/ao_scheme_builtin.c
@@ -198,6 +198,19 @@ ao_scheme_do_length(struct ao_scheme_cons *cons)
 }
 
 ao_poly
+ao_scheme_do_list_copy(struct ao_scheme_cons *cons)
+{
+	struct ao_scheme_cons *new;
+
+	if (!ao_scheme_check_argc(_ao_scheme_atom_length, cons, 1, 1))
+		return AO_SCHEME_NIL;
+	if (!ao_scheme_check_argt(_ao_scheme_atom_length, cons, 0, AO_SCHEME_CONS, 1))
+		return AO_SCHEME_NIL;
+	new = ao_scheme_cons_copy(ao_scheme_poly_cons(ao_scheme_arg(cons, 0)));
+	return ao_scheme_cons_poly(new);
+}
+
+ao_poly
 ao_scheme_do_quote(struct ao_scheme_cons *cons)
 {
 	if (!ao_scheme_check_argc(_ao_scheme_atom_quote, cons, 1, 1))