Initial commit

engines/cruise/stack.cpp

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+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "cruise/cruise_main.h"
+
+namespace Cruise {
+
+// 4 type bigger than the old one, but much safer/cleaner
+stackElementStruct scriptStack[SIZE_STACK];
+
+// VAR
+
+void pushVar(int16 var) {
+	if (positionInStack < SIZE_STACK) {
+		scriptStack[positionInStack].data.shortVar = var;
+		scriptStack[positionInStack].type = STACK_SHORT;
+		positionInStack++;
+	}
+}
+
+int16 popVar() {
+	if (positionInStack <= 0) {
+		return (0);
+	}
+
+	positionInStack--;
+
+	assert(scriptStack[positionInStack].type == STACK_SHORT);
+
+	return (scriptStack[positionInStack].data.shortVar);
+}
+
+//// PTR
+
+void pushPtr(void *ptr) {
+	if (positionInStack < SIZE_STACK) {
+		scriptStack[positionInStack].data.ptrVar = ptr;
+		scriptStack[positionInStack].type = STACK_PTR;
+		positionInStack++;
+	}
+}
+
+void *popPtr() {
+	if (positionInStack <= 0) {
+		return (nullptr);
+	}
+
+	positionInStack--;
+
+	assert(scriptStack[positionInStack].type == STACK_PTR);
+
+	return (scriptStack[positionInStack].data.ptrVar);
+}
+
+} // End of namespace Cruise