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
34 static const char *l9p_log_level_names[] = {
35 "DEBUG",
36 "INFO",
37 "WARN",
38 "ERROR"
39 };
40
41 void
l9p_logf(enum l9p_log_level level,const char * func,const char * fmt,...)42 l9p_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