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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "System"
#include "JNIHelp.h"
#include "JniConstants.h"
#include "ScopedUtfChars.h"
#include <stdlib.h>
#include <string.h>
static jstring System_getEnvByName(JNIEnv* env, jclass, jstring javaName) {
ScopedUtfChars name(env, javaName);
if (name.c_str() == NULL) {
return NULL;
}
return env->NewStringUTF(getenv(name.c_str()));
}
// Pointer to complete environment.
extern char** environ;
static jstring System_getEnvByIndex(JNIEnv* env, jclass, jint index) {
return env->NewStringUTF(environ[index]);
}
// Sets a field via JNI. Used for the standard streams, which are read-only otherwise.
static void System_setFieldImpl(JNIEnv* env, jclass clazz,
jstring javaName, jstring javaSignature, jobject object) {
ScopedUtfChars name(env, javaName);
if (name.c_str() == NULL) {
return;
}
ScopedUtfChars signature(env, javaSignature);
if (signature.c_str() == NULL) {
return;
}
jfieldID fieldID = env->GetStaticFieldID(clazz, name.c_str(), signature.c_str());
env->SetStaticObjectField(clazz, fieldID, object);
}
static JNINativeMethod gMethods[] = {
NATIVE_METHOD(System, getEnvByIndex, "(I)Ljava/lang/String;"),
NATIVE_METHOD(System, getEnvByName, "(Ljava/lang/String;)Ljava/lang/String;"),
NATIVE_METHOD(System, setFieldImpl, "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/Object;)V"),
};
int register_java_lang_System(JNIEnv* env) {
return jniRegisterNativeMethods(env, "java/lang/System", gMethods, NELEM(gMethods));
}
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