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/*
** 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 <pthread.h>
#include <stdlib.h>
#include <string.h>
#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
#include <sys/_system_properties.h>
#include <android/log.h>
struct cache {
const prop_info *pinfo;
uint32_t serial;
char c;
};
static void refresh_cache(struct cache *cache, const char *key)
{
uint32_t serial;
char buf[PROP_VALUE_MAX];
if (!cache->pinfo) {
cache->pinfo = __system_property_find(key);
if (!cache->pinfo) {
return;
}
}
serial = __system_property_serial(cache->pinfo);
if (serial == cache->serial) {
return;
}
cache->serial = serial;
__system_property_read(cache->pinfo, 0, buf);
cache->c = buf[0];
}
static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
static int __android_log_level(const char *tag, int def)
{
/* sizeof() is used on this array below */
static const char log_namespace[] = "persist.log.tag.";
static const size_t base_offset = 8; /* skip "persist." */
/* calculate the size of our key temporary buffer */
const size_t taglen = (tag && *tag) ? strlen(tag) : 0;
/* sizeof(log_namespace) = strlen(log_namespace) + 1 */
char key[sizeof(log_namespace) + taglen];
char *kp;
size_t i;
char c = 0;
/*
* Single layer cache of four properties. Priorities are:
* log.tag.<tag>
* persist.log.tag.<tag>
* log.tag
* persist.log.tag
* Where the missing tag matches all tags and becomes the
* system global default. We do not support ro.log.tag* .
*/
static char *last_tag;
static uint32_t global_serial;
uint32_t current_global_serial;
static struct cache tag_cache[2] = {
{ NULL, -1, 0 },
{ NULL, -1, 0 }
};
static struct cache global_cache[2] = {
{ NULL, -1, 0 },
{ NULL, -1, 0 }
};
strcpy(key, log_namespace);
pthread_mutex_lock(&lock);
current_global_serial = __system_property_area_serial();
if (taglen) {
uint32_t current_local_serial = current_global_serial;
if (!last_tag || strcmp(last_tag, tag)) {
/* invalidate log.tag.<tag> cache */
for(i = 0; i < (sizeof(tag_cache) / sizeof(tag_cache[0])); ++i) {
tag_cache[i].pinfo = NULL;
tag_cache[i].serial = -1;
tag_cache[i].c = '\0';
}
free(last_tag);
last_tag = NULL;
current_global_serial = -1;
}
if (!last_tag) {
last_tag = strdup(tag);
}
strcpy(key + sizeof(log_namespace) - 1, tag);
kp = key;
for(i = 0; i < (sizeof(tag_cache) / sizeof(tag_cache[0])); ++i) {
if (current_local_serial != global_serial) {
refresh_cache(&tag_cache[i], kp);
}
if (tag_cache[i].c) {
c = tag_cache[i].c;
break;
}
kp = key + base_offset;
}
}
switch (toupper(c)) { /* if invalid, resort to global */
case 'V':
case 'D':
case 'I':
case 'W':
case 'E':
case 'F': /* Not officially supported */
case 'A':
case 'S':
break;
default:
/* clear '.' after log.tag */
key[sizeof(log_namespace) - 2] = '\0';
kp = key;
for(i = 0; i < (sizeof(global_cache) / sizeof(global_cache[0])); ++i) {
if (current_global_serial != global_serial) {
refresh_cache(&global_cache[i], kp);
}
if (global_cache[i].c) {
c = global_cache[i].c;
break;
}
kp = key + base_offset;
}
break;
}
global_serial = current_global_serial;
pthread_mutex_unlock(&lock);
switch (toupper(c)) {
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;
}
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