logging_mosq.c

/*
Copyright (c) 2009-2014 Roger Light <roger@atchoo.org>

All rights reserved. This program and the accompanying materials
are made available under the terms of the Eclipse Public License v1.0
and Eclipse Distribution License v1.0 which accompany this distribution.
 
The Eclipse Public License is available at
   https://www.eclipse.org/legal/epl-v10.html
and the Eclipse Distribution License is available at
  https://www.eclipse.org/org/documents/edl-v10.php.
 
Contributors:
   Roger Light - initial implementation and documentation.
*/
#include <assert.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>

#include <mosquitto_internal.h>
#include <mosquitto.h>
#include <memory_mosq.h>

int _mosquitto_log_printf(struct mosquitto *mosq, int priority, const char *fmt, ...)
{
	va_list va;
	char *s;
	int len;

	assert(mosq);
	assert(fmt);

	pthread_mutex_lock(&mosq->log_callback_mutex);
	if(mosq->on_log){
		len = strlen(fmt) + 500;
		s = _mosquitto_malloc(len*sizeof(char));
		if(!s){
			pthread_mutex_unlock(&mosq->log_callback_mutex);
			return MOSQ_ERR_NOMEM;
		}

		va_start(va, fmt);
		vsnprintf(s, len, fmt, va);
		va_end(va);
		s[len-1] = '\0'; /* Ensure string is null terminated. */

		mosq->on_log(mosq, mosq->userdata, priority, s);

		_mosquitto_free(s);
	}
	pthread_mutex_unlock(&mosq->log_callback_mutex);

	return MOSQ_ERR_SUCCESS;
}