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Java example source code file (ProcessEnvironment_md.c)
The ProcessEnvironment_md.c Java example source code/* * 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"); for (i = 0; environ[i]; i++) { /* Ignore corrupted environment variables */ if (strchr(environ[i], '=') != NULL) count++; } result = (*env)->NewObjectArray(env, 2*count, byteArrCls, 0); if (result == NULL) return 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); if (var == NULL) return NULL; val = (*env)->NewByteArray(env, valLength); if (val == NULL) return 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; } Other Java examples (source code examples)Here is a short list of links related to this Java ProcessEnvironment_md.c source code file: |
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