1 files changed, 61 insertions, 0 deletions
diff --git a/liblog/log_is_loggable.c b/liblog/log_is_loggable.c
new file mode 100644
index 0000000..2e09192
--- /dev/null
+++ b/liblog/log_is_loggable.c
@@ -0,0 +1,61 @@
+/*
+** Copyright 2014, 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 <ctype.h>
+#include <string.h>
+#include <sys/system_properties.h>
+
+#include <android/log.h>
+
+static int __android_log_level(const char *tag, int def)
+{
+    char buf[PROP_VALUE_MAX];
+
+    if (!tag || !*tag) {
+        return def;
+    }
+    {
+        static const char log_namespace[] = "persist.log.tag.";
+        char key[sizeof(log_namespace) + strlen(tag)];
+
+        strcpy(key, log_namespace);
+        strcpy(key + sizeof(log_namespace) - 1, tag);
+
+        if (__system_property_get(key + 8, buf) <= 0) {
+            buf[0] = '\0';
+        }
+        if (!buf[0] && __system_property_get(key, buf) <= 0) {
+            buf[0] = '\0';
+        }
+    }
+    switch (toupper(buf[0])) {
+        case 'V': return ANDROID_LOG_VERBOSE;
+        case 'D': return ANDROID_LOG_DEBUG;
+        case 'I': return ANDROID_LOG_INFO;
+        case 'W': return ANDROID_LOG_WARN;
+        case 'E': return ANDROID_LOG_ERROR;
+        case 'F': /* FALLTHRU */ /* Not officially supported */
+        case 'A': return ANDROID_LOG_FATAL;
+        case 'S': return -1; /* ANDROID_LOG_SUPPRESS */
+    }
+    return def;
+}
+
+int __android_log_is_loggable(int prio, const char *tag, int def)
+{
+    int logLevel = __android_log_level(tag, def);
+    return logLevel >= 0 && prio >= logLevel;
+}