LatinIME/native/jni/src/utils/log_utils.cpp

73 lines
2.9 KiB
C++

/*
* Copyright (C) 2013, 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.
*/
#include "log_utils.h"
#include <cstdio>
#include <stdarg.h>
#include "defines.h"
namespace latinime {
/* static */ void LogUtils::logToJava(JNIEnv *const env, const char *const format, ...) {
static const char *TAG = "LatinIME:LogUtils";
const jclass androidUtilLogClass = env->FindClass("android/util/Log");
if (!androidUtilLogClass) {
// If we can't find the class, we are probably in off-device testing, and
// it's expected. Regardless, logging is not essential to functionality, so
// we should just return. However, FindClass has thrown an exception behind
// our back and there is no way to prevent it from doing that, so we clear
// the exception before we return.
env->ExceptionClear();
return;
}
const jmethodID logDotIMethodId = env->GetStaticMethodID(androidUtilLogClass, "i",
"(Ljava/lang/String;Ljava/lang/String;)I");
if (!logDotIMethodId) {
env->ExceptionClear();
if (androidUtilLogClass) env->DeleteLocalRef(androidUtilLogClass);
return;
}
const jstring javaTag = env->NewStringUTF(TAG);
static const int DEFAULT_LINE_SIZE = 128;
char fixedSizeCString[DEFAULT_LINE_SIZE];
va_list argList;
va_start(argList, format);
// Get the necessary size. Add 1 for the 0 terminator.
const int size = vsnprintf(fixedSizeCString, DEFAULT_LINE_SIZE, format, argList) + 1;
va_end(argList);
jstring javaString;
if (size <= DEFAULT_LINE_SIZE) {
// The buffer was large enough.
javaString = env->NewStringUTF(fixedSizeCString);
} else {
// The buffer was not large enough.
va_start(argList, format);
char variableSizeCString[size];
vsnprintf(variableSizeCString, size, format, argList);
va_end(argList);
javaString = env->NewStringUTF(variableSizeCString);
}
env->CallStaticIntMethod(androidUtilLogClass, logDotIMethodId, javaTag, javaString);
if (javaString) env->DeleteLocalRef(javaString);
if (javaTag) env->DeleteLocalRef(javaTag);
if (androidUtilLogClass) env->DeleteLocalRef(androidUtilLogClass);
}
}