log.c

/*-
 * Copyright (c) 2020 Marcel Kaiser. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <time.h>
#include <string.h>
#include <errno.h>
#include <err.h>
#include <sys/types.h>

#include "log.h"

static FILE *logfp;

int
openlog()
{
	if ((logfp = fopen(PATH_LOG, "a+")) == NULL)
		return (-1);
	(void)setvbuf(logfp, NULL, _IOLBF, 0);
	(void)fclose(stderr);
	err_set_file(logfp);

	return (0);
}

void
logprint(const char *fmt, ...)
{
	char    msgbuf[512], errstr[64], *tm;
	time_t  clock;
	va_list ap;

	if (logfp == NULL)
		logfp = stderr;
	va_start(ap, fmt);
	(void)vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap);
	clock = time(NULL); tm = ctime(&clock); (void)strtok(tm, "\n");
	(void)strerror_r(errno, errstr, sizeof(errstr));
	(void)fprintf(logfp, "%s: %s: %s\n", tm, msgbuf, errstr);
}

void
logprintx(const char *fmt, ...)
{
	char    msgbuf[512], *tm;
	time_t  clock;
	va_list ap;

	if (logfp == NULL)
		logfp = stderr;
	va_start(ap, fmt);
	(void)vsnprintf(msgbuf, sizeof(msgbuf), fmt, ap);
	clock = time(NULL); tm = ctime(&clock); (void)strtok(tm, "\n");
	(void)fprintf(logfp, "%s: %s\n", tm, msgbuf);
}