source: log.c @ 2370ec2

  /********************************************************************\
  * BitlBee -- An IRC to other IM-networks gateway                     *
  *                                                                    *
  * Copyright 2002-2005 Wilmer van der Gaast and others                *
  \********************************************************************/

/* Logging services for the bee                         */

/*
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  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 GNU General Public License with
  the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
  if not, write to the Free Software Foundation, Inc., 59 Temple Place,
  Suite 330, Boston, MA  02111-1307  USA
*/

#define BITLBEE_CORE
#include "bitlbee.h"
#include <syslog.h>

static log_t logoutput;

static void log_null(int level, const char *logmessage);
static void log_irc(int level, const char *logmessage);
static void log_syslog(int level, const char *logmessage);
static void log_console(int level, const char *logmessage);

void log_init(void) {
        openlog("bitlbee", LOG_PID, LOG_DAEMON);        

        logoutput.informational = &log_null;
        logoutput.warning = &log_null;
        logoutput.error = &log_null;
#ifdef DEBUG
        logoutput.debug = &log_null;
#endif

        return;
}

void log_link(int level, int output) {
        /* I know it's ugly, but it works and I didn't feel like messing with pointer to function pointers */

        if(level == LOGLVL_INFO) {
                if(output == LOGOUTPUT_NULL)
                        logoutput.informational = &log_null;    
                else if(output == LOGOUTPUT_IRC)
                        logoutput.informational = &log_irc;     
                else if(output == LOGOUTPUT_SYSLOG)
                        logoutput.informational = &log_syslog;  
                else if(output == LOGOUTPUT_CONSOLE) 
                        logoutput.informational = &log_console; 
        }
        else if(level == LOGLVL_WARNING) {
                if(output == LOGOUTPUT_NULL)
                        logoutput.warning = &log_null;
                else if(output == LOGOUTPUT_IRC)
                        logoutput.warning = &log_irc;
                else if(output == LOGOUTPUT_SYSLOG)
                        logoutput.warning = &log_syslog;
                else if(output == LOGOUTPUT_CONSOLE)
                        logoutput.warning = &log_console;
        }
        else if(level == LOGLVL_ERROR) {
                if(output == LOGOUTPUT_NULL)
                        logoutput.error = &log_null;
                else if(output == LOGOUTPUT_IRC)
                        logoutput.error = &log_irc;
                else if(output == LOGOUTPUT_SYSLOG)
                        logoutput.error = &log_syslog;
                else if(output == LOGOUTPUT_CONSOLE)
                        logoutput.error = &log_console;
        }
#ifdef DEBUG
        else if(level == LOGLVL_DEBUG) {
                if(output == LOGOUTPUT_NULL)
                        logoutput.debug = &log_null;
                else if(output == LOGOUTPUT_IRC)
                        logoutput.debug = &log_irc;
                else if(output == LOGOUTPUT_SYSLOG)
                        logoutput.debug = &log_syslog;
                else if(output == LOGOUTPUT_CONSOLE)
                        logoutput.debug = &log_console;
        }
#endif
        return; 

}

void log_message(int level, const char *message, ... ) {

        va_list ap;
        char *msgstring;

        va_start(ap, message);
        msgstring = g_strdup_vprintf(message, ap);
        va_end(ap);

        if(level == LOGLVL_INFO)
                (*(logoutput.informational))(level, msgstring);
        if(level == LOGLVL_WARNING) 
                (*(logoutput.warning))(level, msgstring);
        if(level == LOGLVL_ERROR)
                (*(logoutput.error))(level, msgstring);
#ifdef DEBUG
        if(level == LOGLVL_DEBUG)
                (*(logoutput.debug))(level, msgstring);
#endif

        g_free(msgstring);
        
        return;
}

void log_error(const char *functionname) {
        log_message(LOGLVL_ERROR, "%s: %s", functionname, strerror(errno));
        
        return;
}

static void log_null(int level, const char *message) {
        return;
}

static void log_irc(int level, const char *message) {
        if(level == LOGLVL_ERROR)
                irc_write_all(1, "ERROR :Error: %s", message);
        if(level == LOGLVL_WARNING)
                irc_write_all(0, "ERROR :Warning: %s", message);
        if(level == LOGLVL_INFO)
                irc_write_all(0, "ERROR :Informational: %s", message);  
#ifdef DEBUG
        if(level == LOGLVL_DEBUG)
                irc_write_all(0, "ERROR :Debug: %s", message);  
#endif  

        return;
}

static void log_syslog(int level, const char *message) {
        if(level == LOGLVL_ERROR)
                syslog(LOG_ERR, "%s", message);
        if(level == LOGLVL_WARNING)
                syslog(LOG_WARNING, "%s", message);
        if(level == LOGLVL_INFO)
                syslog(LOG_INFO, "%s", message);
#ifdef DEBUG
        if(level == LOGLVL_DEBUG)
                syslog(LOG_DEBUG, "%s", message);
#endif
        return;
}

static void log_console(int level, const char *message) {
        if(level == LOGLVL_ERROR)
                fprintf(stderr, "Error: %s\n", message);
        if(level == LOGLVL_WARNING)
                fprintf(stderr, "Warning: %s\n", message);
        if(level == LOGLVL_INFO)
                fprintf(stdout, "Informational: %s\n", message);
#ifdef DEBUG
        if(level == LOGLVL_DEBUG)
                fprintf(stdout, "Debug: %s\n", message);
#endif
        /* Always log stuff in syslogs too. */
        log_syslog(level, message);
        return;
}