GLK: ALAN2: Initial work on the Alan2 subengine

1 files changed, 88 insertions, 0 deletions

diff --git a/engines/glk/alan2/util.h b/engines/glk/alan2/util.h
new file mode 100644
index 0000000000..3f5a482cd7
--- /dev/null
+++ b/engines/glk/alan2/util.h
@@ -0,0 +1,88 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef GLK_ALAN2_UTIL
+#define GLK_ALAN2_UTIL
+
+#include "glk/alan2/acode.h"
+#include "glk/alan2/alan2.h"
+#include "glk/alan2/types.h"
+
+namespace Glk {
+namespace Alan2 {
+
+// TODO: Move these
+LitElem litValues[];
+uint32 litCount = 0;	// for LITMAX
+extern ActElem *acts;	// Actor table pointer
+extern ObjElem *objs;	// Object table pointer
+
+// Type checks 
+bool isObj(Aword x) {
+	return x >= OBJMIN && x <= OBJMAX;
+}
+
+bool isAct(Aword x) {
+	return x >= ACTMIN && x <= ACTMAX;
+}
+
+bool isCnt(Aword x) {
+	return (x >= CNTMIN && x <= CNTMAX) ||
+		(isObj(x) && objs[x - OBJMIN].cont != 0) ||
+		(isAct(x) && acts[x - ACTMIN].cont != 0);
+}
+
+bool isLoc(Aword x) {
+	return x >= LOCMIN && x <= LOCMAX;
+}
+
+bool isNum(Aword x) {
+	return x >= LITMIN && x <= LITMAX && litValues[x - LITMIN].type == TYPNUM;
+}
+
+bool isStr(Aword x) {
+	return x >= LITMIN && x <= LITMAX && litValues[x - LITMIN].type == TYPSTR;
+}
+
+bool isLit(Aword x) {
+	return x >= LITMIN && x <= LITMAX;
+}
+
+bool endOfTable(LimElem *addr) {
+	Aword *x = (Aword *)addr;
+	return *x == EOF;
+}
+
+bool endOfTable(ScrElem *addr) {
+	Aword *x = (Aword *)addr;
+	return *x == EOF;
+}
+
+bool endOfTable(ExtElem *addr) {
+	Aword *x = (Aword *)addr;
+	return *x == EOF;
+}
+
+} // End of namespace Alan2
+} // Engine of namespace GLK
+
+#endif