/**
 * General purpose logger class.
 *
 * Copyright (C) 2013 Tobias Klauser <tklauser@distanz.ch>
 *
 * This file is subject to the terms and conditions of the GNU General
 * Public License, version 2.
 */

#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <time.h>

#include "Logger.h"

const char *Logger::_LOGGER_DATE_FMT = "%b %d %Y %H:%M:%S";

int Logger::_log_vfprintf(FILE *f, const char *prefix, const char *fmt, va_list ap)
{
	struct timeval now;
	char buf[64];
	int ret;

	if (gettimeofday(&now, NULL))
		return -EINVAL;

	strftime(buf, sizeof(buf), _LOGGER_DATE_FMT, localtime(&now.tv_sec));
	ret = fprintf(f, "[%s.%03lu] %s%s", buf, now.tv_usec / 1000,
			prefix ? prefix : "", prefix ? ": " : "");

	return vfprintf(f, fmt, ap);
}

int Logger::log(const char *fmt, ...)
{
	va_list ap;
	int ret;

	va_start(ap, fmt);
	ret = _log_vfprintf(_f_out, NULL, fmt, ap);
	va_end(ap);

	return ret;
}

int Logger::err(const char *fmt, ...)
{
	va_list ap;
	int ret;

	va_start(ap, fmt);
	ret = _log_vfprintf(_f_err, "Error", fmt, ap);
	va_end(ap);

	return ret;
}