1/*
2 * Copyright 2016 Jakub Klama <jceel@FreeBSD.org>
3 * All rights reserved
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted providing that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
22 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
23 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGE.
25 *
26 */
27
28#include <stdio.h>
29#include <stdlib.h>
30#include <stdarg.h>
31#include <string.h>
32#include "log.h"
33
34static const char *l9p_log_level_names[] = {
35	"DEBUG",
36	"INFO",
37	"WARN",
38	"ERROR"
39};
40
41void
42l9p_logf(enum l9p_log_level level, const char *func, const char *fmt, ...)
43{
44	const char *dest = NULL;
45	static FILE *stream = NULL;
46	va_list ap;
47
48	if (stream == NULL) {
49		dest = getenv("LIB9P_LOGGING");
50		if (dest == NULL)
51			return;
52		else if (!strcmp(dest, "stderr"))
53			stream = stderr;
54		else {
55			stream = fopen(dest, "a");
56			if (stream == NULL)
57				return;
58		}
59	}
60
61	va_start(ap, fmt);
62	fprintf(stream, "[%s]\t %s: ", l9p_log_level_names[level], func);
63	vfprintf(stream, fmt, ap);
64	fprintf(stream, "\n");
65	fflush(stream);
66	va_end(ap);
67}
68