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lib/lib9p/log.c
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/* | |||||
* Copyright 2016 Jakub Klama <jceel@FreeBSD.org> | |||||
* All rights reserved | |||||
* | |||||
* Redistribution and use in source and binary forms, with or without | |||||
* modification, are permitted providing 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 <string.h> | |||||
#include "log.h" | |||||
static const char *l9p_log_level_names[] = { | |||||
"DEBUG", | |||||
"INFO", | |||||
"WARN", | |||||
"ERROR" | |||||
}; | |||||
void | |||||
l9p_logf(enum l9p_log_level level, const char *func, const char *fmt, ...) | |||||
{ | |||||
const char *dest = NULL; | |||||
static FILE *stream = NULL; | |||||
va_list ap; | |||||
if (stream == NULL) { | |||||
dest = getenv("LIB9P_LOGGING"); | |||||
if (dest == NULL) | |||||
return; | |||||
else if (!strcmp(dest, "stderr")) | |||||
stream = stderr; | |||||
else { | |||||
stream = fopen(dest, "a"); | |||||
if (stream == NULL) | |||||
return; | |||||
} | |||||
} | |||||
va_start(ap, fmt); | |||||
fprintf(stream, "[%s]\t %s: ", l9p_log_level_names[level], func); | |||||
vfprintf(stream, fmt, ap); | |||||
fprintf(stream, "\n"); | |||||
fflush(stream); | |||||
va_end(ap); | |||||
} |