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

[fw/altos] / src / lisp / ao_lisp_int.c

diff --git a/src/lisp/ao_lisp_int.c b/src/lisp/ao_lisp_int.c
index 3b5341bd754bf557110b594171f5fec2d2668f34..8e467755ddb5fb86e706bd0b3d7a42882f625351 100644 (file)
--- 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));
+}