Initial commit

engines/glk/zcode/processor_table.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 "glk/zcode/processor.h"
+
+namespace Glk {
+namespace ZCode {
+
+void Processor::z_copy_table() {
+	zword addr;
+	zword size = zargs[2];
+	zbyte value;
+	int i;
+
+	if (zargs[1] == 0) {
+		// zero table
+		for (i = 0; i < size; i++)
+			storeb((zword)(zargs[0] + i), 0);
+	} else if ((short) size < 0 || zargs[0] > zargs[1])	{
+		// copy forwards
+		for (i = 0; i < (((short)size < 0) ? -(short)size : size); i++) {
+			addr = zargs[0] + i;
+			LOW_BYTE(addr, value);
+			storeb((zword)(zargs[1] + i), value);
+		}
+	} else {
+		// copy backwards
+		for (i = size - 1; i >= 0; i--) {
+			addr = zargs[0] + i;
+			LOW_BYTE(addr, value);
+			storeb((zword)(zargs[1] + i), value);
+		}
+	}
+}
+
+void Processor::z_loadb() {
+	zword addr = zargs[0] + zargs[1];
+	zbyte value;
+
+	LOW_BYTE(addr, value);
+
+	store(value);
+}
+
+void Processor::z_loadw() {
+	zword addr = zargs[0] + 2 * zargs[1];
+	zword value;
+
+	LOW_WORD(addr, value);
+
+	store(value);
+}
+
+void Processor::z_scan_table() {
+	zword addr = zargs[1];
+	int i;
+
+	// Supply default arguments
+	if (zargc < 4)
+	zargs[3] = 0x82;
+
+	// Scan byte or word array
+	for (i = 0; i < zargs[2]; i++) {
+		if (zargs[3] & 0x80) {
+			// scan word array
+			zword wvalue;
+
+			LOW_WORD(addr, wvalue);
+
+			if (wvalue == zargs[0])
+				goto finished;
+		} else {
+			// scan byte array
+			zbyte bvalue;
+
+			LOW_BYTE(addr, bvalue);
+
+			if (bvalue == zargs[0])
+				goto finished;
+		}
+
+		addr += zargs[3] & 0x7f;
+	}
+
+	addr = 0;
+
+finished:
+	store(addr);
+	branch(addr);
+}
+
+void Processor::z_storeb() {
+	storeb((zword)(zargs[0] + zargs[1]), zargs[2]);
+}
+
+void Processor::z_storew() {
+	storew((zword)(zargs[0] + 2 * zargs[1]), zargs[2]);
+}
+
+} // End of namespace ZCode
+} // End of namespace Glk