altos/lisp: Add 'big' ints -- 24 bits wide

With the default ints being only 14 bits, having a larger type with
more precision seems useful. This is not exposed to the application.

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

1 files changed, 57 insertions, 0 deletions

diff --git a/src/lisp/ao_lisp_int.c b/src/lisp/ao_lisp_int.c
index 3b5341bd..8e467755 100644
--- a/src/lisp/ao_lisp_int.c
+++ b/src/lisp/ao_lisp_int.c
@@ -20,3 +20,60 @@ ao_lisp_int_write(ao_poly p)
 	int i = ao_lisp_poly_int(p);
 	printf("%d", i);
 }
+
+int32_t
+ao_lisp_poly_integer(ao_poly p)
+{
+	switch (ao_lisp_poly_base_type(p)) {
+	case AO_LISP_INT:
+		return ao_lisp_poly_int(p);
+	case AO_LISP_OTHER:
+		if (ao_lisp_other_type(ao_lisp_poly_other(p)) == AO_LISP_BIGINT)
+			return ao_lisp_bigint_int(ao_lisp_poly_bigint(p)->value);
+	}
+	return AO_LISP_NOT_INTEGER;
+}
+
+ao_poly
+ao_lisp_integer_poly(int32_t p)
+{
+	struct ao_lisp_bigint	*bi;
+
+	if (AO_LISP_MIN_INT <= p && p <= AO_LISP_MAX_INT)
+		return ao_lisp_int_poly(p);
+	bi = ao_lisp_alloc(sizeof (struct ao_lisp_bigint));
+	bi->value = ao_lisp_int_bigint(p);
+	return ao_lisp_bigint_poly(bi);
+}
+
+static void bigint_mark(void *addr)
+{
+	(void) addr;
+}
+
+static int bigint_size(void *addr)
+{
+	if (!addr)
+		return 0;
+	return sizeof (struct ao_lisp_bigint);
+}
+
+static void bigint_move(void *addr)
+{
+	(void) addr;
+}
+
+const struct ao_lisp_type ao_lisp_bigint_type = {
+	.mark = bigint_mark,
+	.size = bigint_size,
+	.move = bigint_move,
+	.name = "bigint",
+};
+
+void
+ao_lisp_bigint_write(ao_poly p)
+{
+	struct ao_lisp_bigint	*bi = ao_lisp_poly_bigint(p);
+
+	printf("%d", ao_lisp_bigint_int(bi->value));
+}