Home | History | Annotate | Download | only in native 
      1 /*
      2  * Copyright (c) 2003, 2004, Oracle and/or its affiliates. All rights reserved.
      3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
      4  *
      5  * This code is free software; you can redistribute it and/or modify it
      6  * under the terms of the GNU General Public License version 2 only, as
      7  * published by the Free Software Foundation.  Oracle designates this
      8  * particular file as subject to the "Classpath" exception as provided
      9  * by Oracle in the LICENSE file that accompanied this code.
     10  *
     11  * This code is distributed in the hope that it will be useful, but WITHOUT
     12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
     13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
     14  * version 2 for more details (a copy is included in the LICENSE file that
     15  * accompanied this code).
     16  *
     17  * You should have received a copy of the GNU General Public License version
     18  * 2 along with this work; if not, write to the Free Software Foundation,
     19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
     20  *
     21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
     22  * or visit www.oracle.com if you need additional information or have any
     23  * questions.
     24  */
     25 
     26 #include <stdlib.h>
     27 #include <string.h>
     28 #include "jni.h"
     29 #include "jni_util.h"
     30 
     31 #ifdef __APPLE__
     32 #include <crt_externs.h>
     33 #define environ (*_NSGetEnviron())
     34 #endif
     35 #include "JNIHelp.h"
     36 
     37 #define NATIVE_METHOD(className, functionName, signature) \
     38 { #functionName, signature, (void*)(className ## _ ## functionName) }
     39 
     40 JNIEXPORT jobjectArray JNICALL
     41 ProcessEnvironment_environ(JNIEnv *env, jclass ign)
     42 {
     43     /* This is one of the rare times it's more portable to declare an
     44      * external symbol explicitly, rather than via a system header.
     45      * The declaration is standardized as part of UNIX98, but there is
     46      * no standard (not even de-facto) header file where the
     47      * declaration is to be found.  See:
     48      * http://www.opengroup.org/onlinepubs/007908799/xbd/envvar.html */
     49 #ifndef __APPLE__
     50     extern char ** environ; /* environ[i] looks like: VAR=VALUE\0 */
     51 #endif
     52 
     53     jsize count = 0;
     54     jsize i, j;
     55     jobjectArray result;
     56     jclass byteArrCls = (*env)->FindClass(env, "[B");
     57 
     58     for (i = 0; environ[i]; i++) {
     59         /* Ignore corrupted environment variables */
     60         if (strchr(environ[i], '=') != NULL)
     61             count++;
     62     }
     63 
     64     result = (*env)->NewObjectArray(env, 2*count, byteArrCls, 0);
     65     if (result == NULL) return NULL;
     66 
     67     for (i = 0, j = 0; environ[i]; i++) {
     68         const char * varEnd = strchr(environ[i], '=');
     69         /* Ignore corrupted environment variables */
     70         if (varEnd != NULL) {
     71             jbyteArray var, val;
     72             const char * valBeg = varEnd + 1;
     73             jsize varLength = varEnd - environ[i];
     74             jsize valLength = strlen(valBeg);
     75             var = (*env)->NewByteArray(env, varLength);
     76             if (var == NULL) return NULL;
     77             val = (*env)->NewByteArray(env, valLength);
     78             if (val == NULL) return NULL;
     79             (*env)->SetByteArrayRegion(env, var, 0, varLength,
     80                                        (jbyte*) environ[i]);
     81             (*env)->SetByteArrayRegion(env, val, 0, valLength,
     82                                        (jbyte*) valBeg);
     83             (*env)->SetObjectArrayElement(env, result, 2*j  , var);
     84             (*env)->SetObjectArrayElement(env, result, 2*j+1, val);
     85             (*env)->DeleteLocalRef(env, var);
     86             (*env)->DeleteLocalRef(env, val);
     87             j++;
     88         }
     89     }
     90 
     91     return result;
     92 }
     93 
     94 static JNINativeMethod gMethods[] = {
     95   NATIVE_METHOD(ProcessEnvironment, environ, "()[[B"),
     96 };
     97 
     98 void register_java_lang_ProcessEnvironment(JNIEnv* env) {
     99   jniRegisterNativeMethods(env, "java/lang/ProcessEnvironment", gMethods, NELEM(gMethods));
    100 }
    101