1 /* //device/libs/android_runtime/android_util_Log.cpp 2 ** 3 ** Copyright 2006, The Android Open Source Project 4 ** 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 8 ** 9 ** http://www.apache.org/licenses/LICENSE-2.0 10 ** 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. 16 */ 17 18 #define LOG_NAMESPACE "log.tag." 19 #define LOG_TAG "Log_println" 20 21 #include <assert.h> 22 #include <cutils/properties.h> 23 #include <utils/Log.h> 24 #include <utils/String8.h> 25 26 #include "jni.h" 27 #include "JNIHelp.h" 28 #include "utils/misc.h" 29 #include "android_runtime/AndroidRuntime.h" 30 #include "android_util_Log.h" 31 32 #define MIN(a,b) ((a<b)?a:b) 33 34 namespace android { 35 36 struct levels_t { 37 jint verbose; 38 jint debug; 39 jint info; 40 jint warn; 41 jint error; 42 jint assert; 43 }; 44 static levels_t levels; 45 46 static int toLevel(const char* value) 47 { 48 switch (value[0]) { 49 case 'V': return levels.verbose; 50 case 'D': return levels.debug; 51 case 'I': return levels.info; 52 case 'W': return levels.warn; 53 case 'E': return levels.error; 54 case 'A': return levels.assert; 55 case 'S': return -1; // SUPPRESS 56 } 57 return levels.info; 58 } 59 60 static jboolean isLoggable(const char* tag, jint level) { 61 String8 key; 62 key.append(LOG_NAMESPACE); 63 key.append(tag); 64 65 char buf[PROPERTY_VALUE_MAX]; 66 if (property_get(key.string(), buf, "") <= 0) { 67 buf[0] = '\0'; 68 } 69 70 int logLevel = toLevel(buf); 71 return logLevel >= 0 && level >= logLevel; 72 } 73 74 static jboolean android_util_Log_isLoggable(JNIEnv* env, jobject clazz, jstring tag, jint level) 75 { 76 if (tag == NULL) { 77 return false; 78 } 79 80 const char* chars = env->GetStringUTFChars(tag, NULL); 81 if (!chars) { 82 return false; 83 } 84 85 jboolean result = false; 86 if ((strlen(chars)+sizeof(LOG_NAMESPACE)) > PROPERTY_KEY_MAX) { 87 char buf2[200]; 88 snprintf(buf2, sizeof(buf2), "Log tag \"%s\" exceeds limit of %zu characters\n", 89 chars, PROPERTY_KEY_MAX - sizeof(LOG_NAMESPACE)); 90 91 jniThrowException(env, "java/lang/IllegalArgumentException", buf2); 92 } else { 93 result = isLoggable(chars, level); 94 } 95 96 env->ReleaseStringUTFChars(tag, chars); 97 return result; 98 } 99 100 bool android_util_Log_isVerboseLogEnabled(const char* tag) { 101 return isLoggable(tag, levels.verbose); 102 } 103 104 /* 105 * In class android.util.Log: 106 * public static native int println_native(int buffer, int priority, String tag, String msg) 107 */ 108 static jint android_util_Log_println_native(JNIEnv* env, jobject clazz, 109 jint bufID, jint priority, jstring tagObj, jstring msgObj) 110 { 111 const char* tag = NULL; 112 const char* msg = NULL; 113 114 if (msgObj == NULL) { 115 jniThrowNullPointerException(env, "println needs a message"); 116 return -1; 117 } 118 119 if (bufID < 0 || bufID >= LOG_ID_MAX) { 120 jniThrowNullPointerException(env, "bad bufID"); 121 return -1; 122 } 123 124 if (tagObj != NULL) 125 tag = env->GetStringUTFChars(tagObj, NULL); 126 msg = env->GetStringUTFChars(msgObj, NULL); 127 128 int res = __android_log_buf_write(bufID, (android_LogPriority)priority, tag, msg); 129 130 if (tag != NULL) 131 env->ReleaseStringUTFChars(tagObj, tag); 132 env->ReleaseStringUTFChars(msgObj, msg); 133 134 return res; 135 } 136 137 /* 138 * JNI registration. 139 */ 140 static JNINativeMethod gMethods[] = { 141 /* name, signature, funcPtr */ 142 { "isLoggable", "(Ljava/lang/String;I)Z", (void*) android_util_Log_isLoggable }, 143 { "println_native", "(IILjava/lang/String;Ljava/lang/String;)I", (void*) android_util_Log_println_native }, 144 }; 145 146 int register_android_util_Log(JNIEnv* env) 147 { 148 jclass clazz = env->FindClass("android/util/Log"); 149 150 if (clazz == NULL) { 151 ALOGE("Can't find android/util/Log"); 152 return -1; 153 } 154 155 levels.verbose = env->GetStaticIntField(clazz, env->GetStaticFieldID(clazz, "VERBOSE", "I")); 156 levels.debug = env->GetStaticIntField(clazz, env->GetStaticFieldID(clazz, "DEBUG", "I")); 157 levels.info = env->GetStaticIntField(clazz, env->GetStaticFieldID(clazz, "INFO", "I")); 158 levels.warn = env->GetStaticIntField(clazz, env->GetStaticFieldID(clazz, "WARN", "I")); 159 levels.error = env->GetStaticIntField(clazz, env->GetStaticFieldID(clazz, "ERROR", "I")); 160 levels.assert = env->GetStaticIntField(clazz, env->GetStaticFieldID(clazz, "ASSERT", "I")); 161 162 return AndroidRuntime::registerNativeMethods(env, "android/util/Log", gMethods, NELEM(gMethods)); 163 } 164 165 }; // namespace android 166
