logfile.cpp

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/***
 *** See the file "L2_RTI_EO1/disclaimers-and-notices-L2.txt" for 
 *** information on usage and redistribution of this file, 
 *** and for a DISCLAIMER OF ALL WARRANTIES.
 ***/
XF#include "LogFile.hpp"
#include <string.h>            // for strchr(), strncpy()
#include "ExceptionAction.hpp"
#include "Logging.hpp"
#include "ioLib.h"


LogFile::LogFile(const char* pathname,
                 unsigned bytesPerVersion,
                 unsigned numberOfVersions) :
  d_pathname(pathname),
  d_bytesPerVersion(bytesPerVersion),
  d_numberOfVersions(numberOfVersions),
  d_currentVersion(0),
  d_byteCount(0),
  d_file(0) {
  // assert(pathname != 0 && strlen(pathname != 0);
  // assert(bytesPerVersion > 0);
  // assert(numberOfVersions > 0);
}


LogFile::~LogFile() {
  // The log file streams should be closed explicitly, but just in case...
  closeFile();
}


// Insert the version number before the last 0
void LogFile::makeVersionPathname(char versionPathname[]) {
  // Find the last period in the pathname
  const char* lastPeriod = strchr(d_pathname, '.');
  if (lastPeriod == 0) {
    // There is no period in the pathname; append the version number
    sprintf(versionPathname, "%s.v%d", d_pathname, d_currentVersion);
  } else {
    // There is a period in the pathname; insert the version number before it
    const int prefixLength = strlen(d_pathname) - strlen(lastPeriod);
    // The part before the last period
    strncpy(versionPathname, d_pathname, prefixLength);
    sprintf(versionPathname + prefixLength,
            "%i.%s",
            d_currentVersion, // the version number
            lastPeriod + 1);  // the extension
  }
}


void LogFile::assureOpen() {
  if (d_file == 0) {
    char versionPathname[256];
    makeVersionPathname(versionPathname);
    if ((d_file = creat(versionPathname, O_WRONLY)) == 0) {
      ExceptionAction::logFileOpenFailure(versionPathname);
    }
  }
}


void LogFile::writeToDisk(const LOG_MSG& logMsg) {
  int strSize;
  char str [MAX_MSG_LENGTH+1];
  strSize = sprintf(str, "%s\n", logMsg.msg);
  #if DEBUG_LEVEL==3
    puts(str);  // output to the serial port too.
  #endif

  // error check
  if ((d_byteCount += strSize) >= d_bytesPerVersion) {
    // Change version
    d_currentVersion = ++d_currentVersion % d_numberOfVersions;
    // Close the old file; it will be re-opened when needed
    closeFile();
    // Reset the byte count
    d_byteCount = strSize;
  }
  assureOpen();
  if (d_file == 0) {
    ExceptionAction::noLogFile(logMsg.msg, logMsg.msgType);
  } else {
    write(d_file, str, strSize);
    ioctl (d_file, FIOFLUSH, 0);  // force flushing out to file.
  }
}


void LogFile::closeFile() {
  if (d_file != 0) {
    ioctl (d_file, FIOFLUSH, 0);  // force flushing out to file.
    close(d_file);
    d_file = 0;
  }
}