JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
#include <stdlib.h>

#include "jni.h"
#include "jni_util.h"
#include <windows.h>

static jstring
environmentBlock9x(JNIEnv *env)
{
    int i;
    jmethodID String_init_ID;
    jbyteArray bytes;
    jbyte *blockA;
    jclass string_class;

    string_class = JNU_ClassString(env);
    CHECK_NULL_RETURN(string_class, NULL);

    String_init_ID =
        (*env)->GetMethodID(env, string_class, "<init>", "([B)V");
    CHECK_NULL_RETURN(String_init_ID, NULL);

    blockA = (jbyte *) GetEnvironmentStringsA();
    if (blockA == NULL) {
        /* Both GetEnvironmentStringsW and GetEnvironmentStringsA
         * failed.  Out of memory is our best guess.  */
        JNU_ThrowOutOfMemoryError(env, "GetEnvironmentStrings failed");
        return NULL;
    }

    /* Don't search for "\0\0", since an empty environment block may
       legitimately consist of a single "\0". */
    for (i = 0; blockA[i];)
        while (blockA[i++])
            ;

    if ((bytes = (*env)->NewByteArray(env, i)) == NULL) {
        FreeEnvironmentStringsA(blockA);
        return NULL;
    }
    (*env)->SetByteArrayRegion(env, bytes, 0, i, blockA);
    FreeEnvironmentStringsA(blockA);
    return (*env)->NewObject(env, string_class,
                             String_init_ID, bytes);
}

/* Returns a Windows style environment block, discarding final trailing NUL */
JNIEXPORT jstring JNICALL
Java_java_lang_ProcessEnvironment_environmentBlock(JNIEnv *env, jclass klass)
{
    int i;
    jstring envblock;
    jchar *blockW = (jchar *) GetEnvironmentStringsW();
    if (blockW == NULL)
        return environmentBlock9x(env);


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