Loggers specify what log messages they want to receive during registration.

This also allows us to generate the log message only once for all
loggers that need it (avoids calls to custom printf specifier callbacks).

To update the log levels loggers can simply be registered again.

src/libcharon/plugins/android/android_logger.c

@@ -47,34 +47,36 @@ struct private_android_logger_t {
 
 
 METHOD(logger_t, log_, void,
-	   private_android_logger_t *this, debug_t group, level_t level,
-	   int thread, ike_sa_t* ike_sa, char *format, va_list args)
+	private_android_logger_t *this, debug_t group, level_t level,
+	int thread, ike_sa_t* ike_sa, char *message)
 {
-	if (level <= this->level)
-	{
-		int prio = level > 1 ? ANDROID_LOG_DEBUG : ANDROID_LOG_INFO;
-		char sgroup[16], buffer[8192];
-		char *current = buffer, *next;
-		snprintf(sgroup, sizeof(sgroup), "%N", debug_names, group);
-		vsnprintf(buffer, sizeof(buffer), format, args);
-		this->mutex->lock(this->mutex);
-		while (current)
-		{	/* log each line separately */
-			next = strchr(current, '\n');
-			if (next)
-			{
-				*(next++) = '\0';
-			}
-			__android_log_print(prio, "charon", "%.2d[%s] %s\n",
-								thread, sgroup, current);
-			current = next;
+	int prio = level > 1 ? ANDROID_LOG_DEBUG : ANDROID_LOG_INFO;
+	char sgroup[16];
+	char *current = message, *next;
+	snprintf(sgroup, sizeof(sgroup), "%N", debug_names, group);
+	this->mutex->lock(this->mutex);
+	while (current)
+	{	/* log each line separately */
+		next = strchr(current, '\n');
+		if (next)
+		{
+			*(next++) = '\0';
 		}
-		this->mutex->unlock(this->mutex);
+		__android_log_print(prio, "charon", "%.2d[%s] %s\n",
+							thread, sgroup, current);
+		current = next;
 	}
+	this->mutex->unlock(this->mutex);
+}
+
+METHOD(logger_t, get_level, level_t,
+	private_android_logger_t *this, debug_t group)
+{
+	return this->level;
 }
 
 METHOD(android_logger_t, destroy, void,
-	   private_android_logger_t *this)
+	private_android_logger_t *this)
 {
 	this->mutex->destroy(this->mutex);
 	free(this);
@@ -91,6 +93,7 @@ android_logger_t *android_logger_create()
 		.public = {
 			.logger = {
 				.log = _log_,
+				.get_level = _get_level,
 			},
 			.destroy = _destroy,
 		},