altos/scheme: Rename to 'scheme', clean up build

[fw/altos] / src / scheme / ao_scheme_save.c

diff --git a/src/scheme/ao_scheme_save.c b/src/scheme/ao_scheme_save.c
new file mode 100644 (file)
index 0000000..af9345b
--- /dev/null
+++ b/src/scheme/ao_scheme_save.c
@@ -0,0 +1,77 @@
+/*
+ * 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_scheme.h"
+
+ao_poly
+ao_scheme_do_save(struct ao_scheme_cons *cons)
+{
+       if (!ao_scheme_check_argc(_ao_scheme_atom_save, cons, 0, 0))
+               return AO_SCHEME_NIL;
+
+#ifdef AO_SCHEME_SAVE
+       struct ao_scheme_os_save *os = (struct ao_scheme_os_save *) (void *) &ao_scheme_pool[AO_SCHEME_POOL];
+
+       ao_scheme_collect(AO_SCHEME_COLLECT_FULL);
+       os->atoms = ao_scheme_atom_poly(ao_scheme_atoms);
+       os->globals = ao_scheme_frame_poly(ao_scheme_frame_global);
+       os->const_checksum = ao_scheme_const_checksum;
+       os->const_checksum_inv = (uint16_t) ~ao_scheme_const_checksum;
+
+       if (ao_scheme_os_save())
+               return _ao_scheme_bool_true;
+#endif
+       return _ao_scheme_bool_false;
+}
+
+ao_poly
+ao_scheme_do_restore(struct ao_scheme_cons *cons)
+{
+       if (!ao_scheme_check_argc(_ao_scheme_atom_save, cons, 0, 0))
+               return AO_SCHEME_NIL;
+
+#ifdef AO_SCHEME_SAVE
+       struct ao_scheme_os_save save;
+       struct ao_scheme_os_save *os = (struct ao_scheme_os_save *) (void *) &ao_scheme_pool[AO_SCHEME_POOL];
+
+       if (!ao_scheme_os_restore_save(&save, AO_SCHEME_POOL))
+               return ao_scheme_error(AO_SCHEME_INVALID, "header restore failed");
+
+       if (save.const_checksum != ao_scheme_const_checksum ||
+           save.const_checksum_inv != (uint16_t) ~ao_scheme_const_checksum)
+       {
+               return ao_scheme_error(AO_SCHEME_INVALID, "image is corrupted or stale");
+       }
+
+       if (ao_scheme_os_restore()) {
+
+               ao_scheme_atoms = ao_scheme_poly_atom(os->atoms);
+               ao_scheme_frame_global = ao_scheme_poly_frame(os->globals);
+
+               /* Clear the eval global variabls */
+               ao_scheme_eval_clear_globals();
+
+               /* Reset the allocator */
+               ao_scheme_top = AO_SCHEME_POOL;
+               ao_scheme_collect(AO_SCHEME_COLLECT_FULL);
+
+               /* Re-create the evaluator stack */
+               if (!ao_scheme_eval_restart())
+                       return _ao_scheme_bool_false;
+
+               return _ao_scheme_bool_true;
+       }
+#endif
+       return _ao_scheme_bool_false;
+}