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 "utils/misc.h"
28 #include "android_runtime/AndroidRuntime.h"
29
30 #define MIN(a,b) ((a<b)?a:b)
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
toLevel(const char * value)44 static int toLevel(const char* value)
45 {
46 switch (value[0]) {
47 case 'V': return levels.verbose;
48 case 'D': return levels.debug;
49 case 'I': return levels.info;
50 case 'W': return levels.warn;
51 case 'E': return levels.error;
52 case 'A': return levels.assert;
53 case 'S': return -1; // SUPPRESS
54 }
55 return levels.info;
56 }
57
android_util_Log_isLoggable(JNIEnv * env,jobject clazz,jstring tag,jint level)58 static jboolean android_util_Log_isLoggable(JNIEnv* env, jobject clazz, jstring tag, jint level)
59 {
60 #ifndef HAVE_ANDROID_OS
61 return false;
62 #else /* HAVE_ANDROID_OS */
63 int len;
64 char key[PROPERTY_KEY_MAX];
65 char buf[PROPERTY_VALUE_MAX];
66
67 if (tag == NULL) {
68 return false;
69 }
70
71 jboolean result = false;
72
73 const char* chars = env->GetStringUTFChars(tag, NULL);
74
75 if ((strlen(chars)+sizeof(LOG_NAMESPACE)) > PROPERTY_KEY_MAX) {
76 jclass clazz = env->FindClass("java/lang/IllegalArgumentException");
77 char buf2[200];
78 snprintf(buf2, sizeof(buf2), "Log tag \"%s\" exceeds limit of %d characters\n",
79 chars, PROPERTY_KEY_MAX - sizeof(LOG_NAMESPACE));
80
81 // release the chars!
82 env->ReleaseStringUTFChars(tag, chars);
83
84 env->ThrowNew(clazz, buf2);
85 return false;
86 } else {
87 strncpy(key, LOG_NAMESPACE, sizeof(LOG_NAMESPACE)-1);
88 strcpy(key + sizeof(LOG_NAMESPACE) - 1, chars);
89 }
90
91 env->ReleaseStringUTFChars(tag, chars);
92
93 len = property_get(key, buf, "");
94 int logLevel = toLevel(buf);
95 return (logLevel >= 0 && level >= logLevel) ? true : false;
96 #endif /* HAVE_ANDROID_OS */
97 }
98
99 /*
100 * In class android.util.Log:
101 * public static native int println(int priority, String tag, String msg)
102 */
android_util_Log_println(JNIEnv * env,jobject clazz,jint priority,jstring tagObj,jstring msgObj)103 static jint android_util_Log_println(JNIEnv* env, jobject clazz,
104 jint priority, jstring tagObj, jstring msgObj)
105 {
106 const char* tag = NULL;
107 const char* msg = NULL;
108
109 if (msgObj == NULL) {
110 jclass npeClazz;
111
112 npeClazz = env->FindClass("java/lang/NullPointerException");
113 assert(npeClazz != NULL);
114
115 env->ThrowNew(npeClazz, "println needs a message");
116 return -1;
117 }
118
119 if (tagObj != NULL)
120 tag = env->GetStringUTFChars(tagObj, NULL);
121 msg = env->GetStringUTFChars(msgObj, NULL);
122
123 int res = android_writeLog((android_LogPriority) priority, tag, msg);
124
125 if (tag != NULL)
126 env->ReleaseStringUTFChars(tagObj, tag);
127 env->ReleaseStringUTFChars(msgObj, msg);
128
129 return res;
130 }
131
132 /*
133 * JNI registration.
134 */
135 static JNINativeMethod gMethods[] = {
136 /* name, signature, funcPtr */
137 { "isLoggable", "(Ljava/lang/String;I)Z", (void*) android_util_Log_isLoggable },
138 { "println", "(ILjava/lang/String;Ljava/lang/String;)I", (void*) android_util_Log_println },
139 };
140
register_android_util_Log(JNIEnv * env)141 int register_android_util_Log(JNIEnv* env)
142 {
143 jclass clazz = env->FindClass("android/util/Log");
144
145 if (clazz == NULL) {
146 LOGE("Can't find android/util/Log");
147 return -1;
148 }
149
150 levels.verbose = env->GetStaticIntField(clazz, env->GetStaticFieldID(clazz, "VERBOSE", "I"));
151 levels.debug = env->GetStaticIntField(clazz, env->GetStaticFieldID(clazz, "DEBUG", "I"));
152 levels.info = env->GetStaticIntField(clazz, env->GetStaticFieldID(clazz, "INFO", "I"));
153 levels.warn = env->GetStaticIntField(clazz, env->GetStaticFieldID(clazz, "WARN", "I"));
154 levels.error = env->GetStaticIntField(clazz, env->GetStaticFieldID(clazz, "ERROR", "I"));
155 levels.assert = env->GetStaticIntField(clazz, env->GetStaticFieldID(clazz, "ASSERT", "I"));
156
157 return AndroidRuntime::registerNativeMethods(env, "android/util/Log", gMethods, NELEM(gMethods));
158 }
159
160 }; // namespace android
161
162