usb_moded-log.c
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/**
@file usb_moded-log.c
Copyright (C) 2010 Nokia Corporation. All rights reserved.
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Copyright (C) 2016 Jolla Ltd.
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@author: Philippe De Swert <philippe.de-swert@nokia.com>
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@author: Simo Piiroinen <simo.piiroinen@nokia.com>
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@author: Simo Piiroinen <simo.piiroinen@jollamobile.com>
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This program is free software; you can redistribute it and/or
modify it under the terms of the Lesser GNU General Public License
version 2 as published by the Free Software Foundation.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the Lesser GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <sys/time.h>
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#include <errno.h>
#include <ctype.h>
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#include "usb_moded-log.h"
const char *log_name = "<unset>";
int log_level = LOG_WARNING;
int log_type = LOG_TO_STDERR;
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static char *strip(char *str)
{
unsigned char *src = (unsigned char *)str;
unsigned char *dst = (unsigned char *)str;
while( *src > 0 && *src <= 32 ) ++src;
for( ;; )
{
while( *src > 32 ) *dst++ = *src++;
while( *src > 0 && *src <= 32 ) ++src;
if( *src == 0 ) break;
*dst++ = ' ';
}
*dst = 0;
return str;
}
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static struct timeval log_begtime = { 0, 0 };
static void log_gettime(struct timeval *tv)
{
gettimeofday(tv, 0);
timersub(tv, &log_begtime, tv);
}
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/**
* Print the logged messages to the selected output
*
* @param lev The wanted log level
* @param fmt The message to be logged
* @param va The stdarg variable list
*/
void log_emit_va(int lev, const char *fmt, va_list va)
{
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int saved = errno;
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if( log_level >= lev )
{
switch( log_type )
{
case LOG_TO_SYSLOG:
vsyslog(lev, fmt, va);
break;
case LOG_TO_STDERR:
fprintf(stderr, "%s: ", log_name);
#if LOG_ENABLE_TIMESTAMPS
{
struct timeval tv;
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log_gettime(&tv);
fprintf(stderr, "%3ld.%03ld ",
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(long)tv.tv_sec,
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(long)tv.tv_usec/1000);
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}
#endif
#if LOG_ENABLE_LEVELTAGS
{
static const char *tag = "U:";
switch( lev )
{
case 2: tag = "C:"; break;
case 3: tag = "E:"; break;
case 4: tag = "W:"; break;
case 5: tag = "N:"; break;
case 6: tag = "I:"; break;
case 7: tag = "D:"; break;
}
fprintf(stderr, "%s ", tag);
}
#endif
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{
// squeeze whitespace like syslog does
char buf[1024];
errno = saved;
vsnprintf(buf, sizeof buf - 1, fmt, va);
fprintf(stderr, "%s\n", strip(buf));
}
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break;
default:
// no logging
break;
}
}
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errno = saved;
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}
void log_emit(int lev, const char *fmt, ...)
{
va_list va;
va_start(va, fmt);
log_emit_va(lev, fmt, va);
va_end(va);
}
void log_debugf(const char *fmt, ...)
{
/* This goes always to stderr */
if( log_type == LOG_TO_STDERR && log_level >= LOG_DEBUG )
{
va_list va;
va_start(va, fmt);
vfprintf(stderr, fmt, va);
va_end(va);
}
}
/**
* returns the currently set log level
*
* @return The current log level
*/
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inline int log_get_level(void)
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{
return log_level;
}
/* Set the log level
*
* @param The wanted log level
*/
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inline void log_set_level(int lev)
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{
log_level = lev;
}
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/** Initialize logging */
void log_init(void)
{
/* Get reference time used for verbose logging */
if( !timerisset(&log_begtime) )
gettimeofday(&log_begtime, 0);
}