Strlen.java

/*
 This file is part of jpcsp.

 Jpcsp 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.

 Jpcsp 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 Jpcsp.  If not, see <http://www.gnu.org/licenses/>.
 */
package jpcsp.Allegrex.compiler.nativeCode;

import static jpcsp.Allegrex.Common._a0;
import static jpcsp.Allegrex.Common._a1;
import static jpcsp.Allegrex.Common._a2;

/**
 * @author gid15
 *
 */
public class Strlen extends AbstractNativeCodeSequence {

    static public void call() {
        int srcAddr = getGprA0();

        int srcLength = getStrlen(srcAddr);
        setGprV0(srcLength);
        getCpu()._a0 = srcAddr + srcLength;
        getCpu()._a1 = srcAddr;
        getCpu()._a2 = 0;
    }

    static public void call(int lastUpdatedRegister) {
        int srcAddr = getGprA0();

        int srcLength = getStrlen(srcAddr);
        setGprV0(srcLength);

        // Some games are also assuming that the other registers
        // have been modified... dirty programming
        if (lastUpdatedRegister >= _a0) {
            getCpu()._a0 = srcAddr + srcLength;
            if (lastUpdatedRegister >= _a1) {
                getCpu()._a1 = srcAddr;
                if (lastUpdatedRegister >= _a2) {
                    getCpu()._a2 = 0;
                }
            }
        }
    }
}