1 /* //device/libs/android_runtime/android_util_Log.cpp
3 ** Copyright 2006, The Android Open Source Project
5 ** Licensed under the Apache License, Version 2.0 (the "License");
6 ** you may not use this file except in compliance with the License.
7 ** You may obtain a copy of the License at
9 ** http://www.apache.org/licenses/LICENSE-2.0
11 ** Unless required by applicable law or agreed to in writing, software
12 ** distributed under the License is distributed on an "AS IS" BASIS,
13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 ** See the License for the specific language governing permissions and
15 ** limitations under the License.
18 #define LOG_NAMESPACE "log.tag."
19 #define LOG_TAG "Log_println"
21 #include <android-base/macros.h>
23 #include <cutils/properties.h>
24 #include <log/logger.h> // For LOGGER_ENTRY_MAX_PAYLOAD.
25 #include <utils/Log.h>
26 #include <utils/String8.h>
30 #include "utils/misc.h"
31 #include "core_jni_helpers.h"
32 #include "android_util_Log.h"
44 static levels_t levels;
46 static jboolean isLoggable(const char* tag, jint level) {
47 return __android_log_is_loggable(level, tag, ANDROID_LOG_INFO);
50 static jboolean android_util_Log_isLoggable(JNIEnv* env, jobject clazz, jstring tag, jint level)
56 const char* chars = env->GetStringUTFChars(tag, NULL);
61 jboolean result = false;
62 if ((strlen(chars)+sizeof(LOG_NAMESPACE)) > PROPERTY_KEY_MAX) {
64 snprintf(buf2, sizeof(buf2), "Log tag \"%s\" exceeds limit of %zu characters\n",
65 chars, PROPERTY_KEY_MAX - sizeof(LOG_NAMESPACE));
67 jniThrowException(env, "java/lang/IllegalArgumentException", buf2);
69 result = isLoggable(chars, level);
72 env->ReleaseStringUTFChars(tag, chars);
76 bool android_util_Log_isVerboseLogEnabled(const char* tag) {
77 return isLoggable(tag, levels.verbose);
81 * In class android.util.Log:
82 * public static native int println_native(int buffer, int priority, String tag, String msg)
84 static jint android_util_Log_println_native(JNIEnv* env, jobject clazz,
85 jint bufID, jint priority, jstring tagObj, jstring msgObj)
87 const char* tag = NULL;
88 const char* msg = NULL;
91 jniThrowNullPointerException(env, "println needs a message");
95 if (bufID < 0 || bufID >= LOG_ID_MAX) {
96 jniThrowNullPointerException(env, "bad bufID");
101 tag = env->GetStringUTFChars(tagObj, NULL);
102 msg = env->GetStringUTFChars(msgObj, NULL);
104 int res = __android_log_buf_write(bufID, (android_LogPriority)priority, tag, msg);
107 env->ReleaseStringUTFChars(tagObj, tag);
108 env->ReleaseStringUTFChars(msgObj, msg);
114 * In class android.util.Log:
115 * private static native int logger_entry_max_payload_native()
117 static jint android_util_Log_logger_entry_max_payload_native(JNIEnv* env ATTRIBUTE_UNUSED,
118 jobject clazz ATTRIBUTE_UNUSED)
120 return static_cast<jint>(LOGGER_ENTRY_MAX_PAYLOAD);
126 static const JNINativeMethod gMethods[] = {
127 /* name, signature, funcPtr */
128 { "isLoggable", "(Ljava/lang/String;I)Z", (void*) android_util_Log_isLoggable },
129 { "println_native", "(IILjava/lang/String;Ljava/lang/String;)I", (void*) android_util_Log_println_native },
130 { "logger_entry_max_payload_native", "()I", (void*) android_util_Log_logger_entry_max_payload_native },
133 int register_android_util_Log(JNIEnv* env)
135 jclass clazz = FindClassOrDie(env, "android/util/Log");
137 levels.verbose = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "VERBOSE", "I"));
138 levels.debug = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "DEBUG", "I"));
139 levels.info = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "INFO", "I"));
140 levels.warn = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "WARN", "I"));
141 levels.error = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "ERROR", "I"));
142 levels.assert = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "ASSERT", "I"));
144 return RegisterMethodsOrDie(env, "android/util/Log", gMethods, NELEM(gMethods));
147 }; // namespace android