/*

 * Copyright (c) 2003, 2013, 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 <string.h>

#include "jni.h"

#include "jni_util.h"

#ifdef __APPLE__

#include <crt_externs.h>

#define environ (*_NSGetEnviron())

#else

/* This is one of the rare times it's more portable to declare an

 * external symbol explicitly, rather than via a system header.

 * The declaration is standardized as part of UNIX98, but there is

 * no standard (not even de-facto) header file where the

 * declaration is to be found.  See:

 * http://www.opengroup.org/onlinepubs/009695399/functions/environ.html

 * http://www.opengroup.org/onlinepubs/009695399/functions/xsh_chap02_02.html

 *

 * "All identifiers in this volume of IEEE Std 1003.1-2001, except

 * environ, are defined in at least one of the headers" (!)

 */

extern char **environ;

#endif

JNIEXPORT jobjectArray JNICALL

Java_java_lang_ProcessEnvironment_environ(JNIEnv *env, jclass ign)

{

    jsize count = 0;

    jsize i, j;

    jobjectArray result;

    jclass byteArrCls = (*env)->FindClass(env, "[B");

    CHECK_NULL_RETURN(byteArrCls, NULL);

    for (i = 0; environ[i]; i++) {

        /* Ignore corrupted environment variables */

        if (strchr(environ[i], '=') != NULL)

            count++;

    }

    result = (*env)->NewObjectArray(env, 2*count, byteArrCls, 0);

    CHECK_NULL_RETURN(result, NULL);

    for (i = 0, j = 0; environ[i]; i++) {

        const char * varEnd = strchr(environ[i], '=');

        /* Ignore corrupted environment variables */

        if (varEnd != NULL) {

            jbyteArray var, val;

            const char * valBeg = varEnd + 1;

            jsize varLength = varEnd - environ[i];

            jsize valLength = strlen(valBeg);

            var = (*env)->NewByteArray(env, varLength);

            CHECK_NULL_RETURN(var, NULL);

            val = (*env)->NewByteArray(env, valLength);

            CHECK_NULL_RETURN(val, NULL);

            (*env)->SetByteArrayRegion(env, var, 0, varLength,

                                       (jbyte*) environ[i]);

            (*env)->SetByteArrayRegion(env, val, 0, valLength,

                                       (jbyte*) valBeg);

            (*env)->SetObjectArrayElement(env, result, 2*j  , var);

            (*env)->SetObjectArrayElement(env, result, 2*j+1, val);

            (*env)->DeleteLocalRef(env, var);

            (*env)->DeleteLocalRef(env, val);

            j++;

        }

    }

    return result;

}