/* * OpenMODBUS/TCP to RS-232/485 MODBUS RTU gateway * * log.c - debug logging facility * * Copyright (c) 2002-2003, Victor Antonovich (avmlink@vlink.ru) *  * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: *  * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. *  * - 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 COPYRIGHT HOLDERS AND CONTRIBUTORS * ``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 REGENTS OR * CONTRIBUTORS 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. * * $Id: log.c,v 1.4 2003/10/26 19:26:08 kapyar Exp $ */#include "log.h"#ifdef LOG#include "cfg.h"/* log file full name */char logfullname[INTBUFSIZE + 1];int log_init(char *logname){  FILE *logfile;  int maxlen = INTBUFSIZE;  /* checking log file name */  if (*logname == '/')    strncpy(logfullname, logname, maxlen);  else   {    if (!*logname)    {      /* logfile isn't needed */      *logfullname = '\0';      return RC_OK;    }    /* append default log path */    strncpy(logfullname, LOGPATH, maxlen);    maxlen -= strlen(logfullname);    strncat(logfullname, logname, maxlen);  }  logfile = fopen(logfullname, "at");  if (logfile)  {    fclose(logfile);    return RC_OK;  }  return RC_ERR;}/* Append message STRING to log file LOGNAME */int log_app(char *logname, char *string){  FILE *logfile;  logfile = fopen(logname, "at");  if (logfile)  {    fputs(string, logfile);    fclose(logfile);    return RC_OK;  }  return RC_ERR;}/* Put message with format FMT with errorlevel LEVEL to log file */void log(int level, char *fmt, ...){#ifdef HRDATE  time_t tt;  struct tm *t;#else  struct timeval tv;#endif  va_list args;  int strsize = 0;  static char str[INTBUFSIZE + 1] = {0}, *p;  if (level > cfg.dbglvl) return;#ifdef HRDATE  tt = time(NULL);  t = localtime(&tt);  strsize += strftime(str, 32, "%d %b %Y %H:%M:%S ", t);#else  (void)gettimeofday(&tv, NULL);  strsize += snprintf(str, 32, "%06lu:%06lu ", tv.tv_sec, tv.tv_usec);#endif  va_start(args, fmt);  p = str + strsize;  strsize += vsnprintf(p, INTBUFSIZE - strsize, fmt, args);  va_end(args);  strcpy(str + strsize++, "\n");  if (!isdaemon) printf("%s", str);  if (*logfullname == '\0') return;  log_app(logfullname, str);}#endif