Add first lisp bits

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

1 files changed, 84 insertions, 0 deletions

diff --git a/src/lisp/ao_lisp_cons.c b/src/lisp/ao_lisp_cons.c
new file mode 100644
index 00000000..60cbb2f3
--- /dev/null
+++ b/src/lisp/ao_lisp_cons.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright © 2016 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include "ao_lisp.h"
+
+static void cons_mark(void *addr)
+{
+	struct ao_lisp_cons	*cons = addr;
+
+	for (;;) {
+		ao_lisp_poly_mark(cons->car);
+		cons = cons->cdr;
+		if (!cons)
+			break;
+		if (ao_lisp_mark_memory(cons, sizeof (struct ao_lisp_cons)))
+			break;
+	}
+}
+
+static int cons_size(void *addr)
+{
+	(void) addr;
+	return sizeof (struct ao_lisp_cons);
+}
+
+static void cons_move(void *addr)
+{
+	struct ao_lisp_cons	*cons = addr;
+
+	for (;;) {
+		struct ao_lisp_cons	*cdr;
+
+		cons->car = ao_lisp_poly_move(cons->car);
+		cdr = ao_lisp_move_memory(cons->cdr, sizeof (struct ao_lisp_cons));
+		if (!cdr)
+			break;
+		cons->cdr = cdr;
+		cons = cdr;
+	}
+}
+
+const struct ao_lisp_mem_type ao_lisp_cons_type = {
+	.mark = cons_mark,
+	.size = cons_size,
+	.move = cons_move,
+};
+
+struct ao_lisp_cons *
+ao_lisp_cons(ao_lisp_poly car, struct ao_lisp_cons *cdr)
+{
+	struct ao_lisp_cons	*cons = ao_lisp_alloc(sizeof (struct ao_lisp_cons));
+	if (!cons)
+		return NULL;
+	cons->car = car;
+	cons->cdr = cdr;
+	return cons;
+}
+
+void
+ao_lisp_cons_print(struct ao_lisp_cons *cons)
+{
+	int	first = 1;
+	printf("(");
+	while (cons) {
+		if (!first)
+			printf(" ");
+		fflush(stdout);
+		ao_lisp_poly_print(cons->car);
+		cons = cons->cdr;
+		first = 0;
+	}
+	printf(")");
+}