120 lines
2.5 KiB
C++
120 lines
2.5 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "glk/zcode/processor.h"
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namespace Glk {
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namespace ZCode {
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void Processor::z_copy_table() {
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zword addr;
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zword size = zargs[2];
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zbyte value;
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int i;
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if (zargs[1] == 0) {
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// zero table
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for (i = 0; i < size; i++)
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storeb((zword)(zargs[0] + i), 0);
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} else if ((short) size < 0 || zargs[0] > zargs[1]) {
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// copy forwards
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for (i = 0; i < (((short)size < 0) ? -(short)size : size); i++) {
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addr = zargs[0] + i;
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LOW_BYTE(addr, value);
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storeb((zword)(zargs[1] + i), value);
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}
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} else {
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// copy backwards
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for (i = size - 1; i >= 0; i--) {
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addr = zargs[0] + i;
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LOW_BYTE(addr, value);
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storeb((zword)(zargs[1] + i), value);
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}
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}
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}
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void Processor::z_loadb() {
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zword addr = zargs[0] + zargs[1];
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zbyte value;
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LOW_BYTE(addr, value);
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store(value);
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}
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void Processor::z_loadw() {
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zword addr = zargs[0] + 2 * zargs[1];
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zword value;
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LOW_WORD(addr, value);
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store(value);
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}
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void Processor::z_scan_table() {
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zword addr = zargs[1];
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int i;
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// Supply default arguments
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if (zargc < 4)
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zargs[3] = 0x82;
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// Scan byte or word array
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for (i = 0; i < zargs[2]; i++) {
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if (zargs[3] & 0x80) {
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// scan word array
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zword wvalue;
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LOW_WORD(addr, wvalue);
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if (wvalue == zargs[0])
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goto finished;
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} else {
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// scan byte array
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zbyte bvalue;
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LOW_BYTE(addr, bvalue);
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if (bvalue == zargs[0])
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goto finished;
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}
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addr += zargs[3] & 0x7f;
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}
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addr = 0;
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finished:
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store(addr);
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branch(addr);
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}
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void Processor::z_storeb() {
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storeb((zword)(zargs[0] + zargs[1]), zargs[2]);
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}
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void Processor::z_storew() {
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storew((zword)(zargs[0] + 2 * zargs[1]), zargs[2]);
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}
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} // End of namespace ZCode
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} // End of namespace Glk
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