--- /dev/null
+/*
+ * Copyright © 2017 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_scheme.h"
+
+#ifdef AO_SCHEME_FEATURE_VECTOR
+
+static void vector_mark(void *addr)
+{
+ struct ao_scheme_vector *vector = addr;
+ unsigned int i;
+
+ for (i = 0; i < vector->length; i++) {
+ ao_poly v = vector->vals[i];
+
+ ao_scheme_poly_mark(v, 1);
+ }
+}
+
+static int vector_len_size(uint16_t length)
+{
+ return sizeof (struct ao_scheme_vector) + length * sizeof (ao_poly);
+}
+
+static int vector_size(void *addr)
+{
+ struct ao_scheme_vector *vector = addr;
+
+ return vector_len_size(vector->length);
+}
+
+static void vector_move(void *addr)
+{
+ struct ao_scheme_vector *vector = addr;
+ unsigned int i;
+
+ for (i = 0; i < vector->length; i++)
+ (void) ao_scheme_poly_move(&vector->vals[i], 1);
+}
+
+const struct ao_scheme_type ao_scheme_vector_type = {
+ .mark = vector_mark,
+ .size = vector_size,
+ .move = vector_move,
+ .name = "vector",
+};
+
+struct ao_scheme_vector *
+ao_scheme_vector_alloc(uint16_t length, ao_poly fill)
+{
+ struct ao_scheme_vector *vector;
+ unsigned int i;
+
+ vector = ao_scheme_alloc(vector_len_size(length));
+ if (!vector)
+ return NULL;
+ vector->type = AO_SCHEME_VECTOR;
+ vector->length = length;
+ for (i = 0; i < length; i++)
+ vector->vals[i] = fill;
+ return vector;
+}
+
+void
+ao_scheme_vector_write(ao_poly v)
+{
+ struct ao_scheme_vector *vector = ao_scheme_poly_vector(v);
+ unsigned int i;
+
+ printf("#(");
+ for (i = 0; i < vector->length; i++) {
+ if (i != 0)
+ printf(" ");
+ if (vector->vals[i] == v)
+ printf ("...");
+ else
+ ao_scheme_poly_write(vector->vals[i]);
+ }
+ printf(")");
+}
+
+void
+ao_scheme_vector_display(ao_poly v)
+{
+ struct ao_scheme_vector *vector = ao_scheme_poly_vector(v);
+ unsigned int i;
+
+ for (i = 0; i < vector->length; i++) {
+ if (vector->vals[i] == v)
+ printf("...");
+ else
+ ao_scheme_poly_display(vector->vals[i]);
+ }
+}
+
+static int32_t
+ao_scheme_vector_offset(struct ao_scheme_vector *vector, ao_poly i)
+{
+ int32_t offset = ao_scheme_poly_integer(i);
+
+ if (offset == AO_SCHEME_NOT_INTEGER)
+ ao_scheme_error(AO_SCHEME_INVALID, "vector index %v not integer", i);
+ if (offset < 0 || vector->length <= offset) {
+ ao_scheme_error(AO_SCHEME_INVALID, "vector index %v out of range (max %d)",
+ i, vector->length);
+ offset = AO_SCHEME_NOT_INTEGER;
+ }
+ return offset;
+}
+
+ao_poly
+ao_scheme_vector_get(ao_poly v, ao_poly i)
+{
+ struct ao_scheme_vector *vector = ao_scheme_poly_vector(v);
+ int32_t offset = ao_scheme_vector_offset(vector, i);
+
+ if (offset == AO_SCHEME_NOT_INTEGER)
+ return AO_SCHEME_NIL;
+ return vector->vals[offset];
+}
+
+ao_poly
+ao_scheme_vector_set(ao_poly v, ao_poly i, ao_poly p)
+{
+ struct ao_scheme_vector *vector = ao_scheme_poly_vector(v);
+ int32_t offset = ao_scheme_vector_offset(vector, i);
+
+ if (offset == AO_SCHEME_NOT_INTEGER)
+ return AO_SCHEME_NIL;
+ return vector->vals[offset] = p;
+}
+
+struct ao_scheme_vector *
+ao_scheme_list_to_vector(struct ao_scheme_cons *cons)
+{
+ uint16_t length;
+ uint16_t i;
+ struct ao_scheme_vector *vector;
+
+ length = (uint16_t) ao_scheme_cons_length (cons);
+ if (ao_scheme_exception)
+ return NULL;
+
+ ao_scheme_cons_stash(0, cons);
+ vector = ao_scheme_vector_alloc(length, AO_SCHEME_NIL);
+ cons = ao_scheme_cons_fetch(0);
+ if (!vector)
+ return NULL;
+ i = 0;
+ while (cons) {
+ vector->vals[i++] = cons->car;
+ cons = ao_scheme_cons_cdr(cons);
+ }
+ return vector;
+}
+
+struct ao_scheme_cons *
+ao_scheme_vector_to_list(struct ao_scheme_vector *vector)
+{
+ unsigned int i;
+ uint16_t length = vector->length;
+ struct ao_scheme_cons *cons = NULL;
+
+ for (i = length; i-- > 0;) {
+ ao_scheme_poly_stash(2, ao_scheme_vector_poly(vector));
+ cons = ao_scheme_cons_cons(vector->vals[i], ao_scheme_cons_poly(cons));
+ vector = ao_scheme_poly_vector(ao_scheme_poly_fetch(2));
+ if (!cons)
+ return NULL;
+ }
+ return cons;
+}
+
+#endif /* AO_SCHEME_FEATURE_VECTOR */