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 "core_jni_helpers.h"
30 #include "android_util_Log.h"
31
32 namespace android {
33
34 struct levels_t {
35 jint verbose;
36 jint debug;
37 jint info;
38 jint warn;
39 jint error;
40 jint assert;
41 };
42 static levels_t levels;
43
isLoggable(const char * tag,jint level)44 static jboolean isLoggable(const char* tag, jint level) {
45 return __android_log_is_loggable(level, tag, ANDROID_LOG_INFO);
46 }
47
android_util_Log_isLoggable(JNIEnv * env,jobject clazz,jstring tag,jint level)48 static jboolean android_util_Log_isLoggable(JNIEnv* env, jobject clazz, jstring tag, jint level)
49 {
50 if (tag == NULL) {
51 return false;
52 }
53
54 const char* chars = env->GetStringUTFChars(tag, NULL);
55 if (!chars) {
56 return false;
57 }
58
59 jboolean result = false;
60 if ((strlen(chars)+sizeof(LOG_NAMESPACE)) > PROPERTY_KEY_MAX) {
61 char buf2[200];
62 snprintf(buf2, sizeof(buf2), "Log tag \"%s\" exceeds limit of %zu characters\n",
63 chars, PROPERTY_KEY_MAX - sizeof(LOG_NAMESPACE));
64
65 jniThrowException(env, "java/lang/IllegalArgumentException", buf2);
66 } else {
67 result = isLoggable(chars, level);
68 }
69
70 env->ReleaseStringUTFChars(tag, chars);
71 return result;
72 }
73
android_util_Log_isVerboseLogEnabled(const char * tag)74 bool android_util_Log_isVerboseLogEnabled(const char* tag) {
75 return isLoggable(tag, levels.verbose);
76 }
77
78 /*
79 * In class android.util.Log:
80 * public static native int println_native(int buffer, int priority, String tag, String msg)
81 */
android_util_Log_println_native(JNIEnv * env,jobject clazz,jint bufID,jint priority,jstring tagObj,jstring msgObj)82 static jint android_util_Log_println_native(JNIEnv* env, jobject clazz,
83 jint bufID, jint priority, jstring tagObj, jstring msgObj)
84 {
85 const char* tag = NULL;
86 const char* msg = NULL;
87
88 if (msgObj == NULL) {
89 jniThrowNullPointerException(env, "println needs a message");
90 return -1;
91 }
92
93 if (bufID < 0 || bufID >= LOG_ID_MAX) {
94 jniThrowNullPointerException(env, "bad bufID");
95 return -1;
96 }
97
98 if (tagObj != NULL)
99 tag = env->GetStringUTFChars(tagObj, NULL);
100 msg = env->GetStringUTFChars(msgObj, NULL);
101
102 int res = __android_log_buf_write(bufID, (android_LogPriority)priority, tag, msg);
103
104 if (tag != NULL)
105 env->ReleaseStringUTFChars(tagObj, tag);
106 env->ReleaseStringUTFChars(msgObj, msg);
107
108 return res;
109 }
110
111 /*
112 * JNI registration.
113 */
114 static JNINativeMethod gMethods[] = {
115 /* name, signature, funcPtr */
116 { "isLoggable", "(Ljava/lang/String;I)Z", (void*) android_util_Log_isLoggable },
117 { "println_native", "(IILjava/lang/String;Ljava/lang/String;)I", (void*) android_util_Log_println_native },
118 };
119
register_android_util_Log(JNIEnv * env)120 int register_android_util_Log(JNIEnv* env)
121 {
122 jclass clazz = FindClassOrDie(env, "android/util/Log");
123
124 levels.verbose = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "VERBOSE", "I"));
125 levels.debug = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "DEBUG", "I"));
126 levels.info = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "INFO", "I"));
127 levels.warn = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "WARN", "I"));
128 levels.error = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "ERROR", "I"));
129 levels.assert = env->GetStaticIntField(clazz, GetStaticFieldIDOrDie(env, clazz, "ASSERT", "I"));
130
131 return RegisterMethodsOrDie(env, "android/util/Log", gMethods, NELEM(gMethods));
132 }
133
134 }; // namespace android
135