tigervnc/common/rfb/Logger_file.cxx

/* Copyright (C) 2002-2005 RealVNC Ltd.  All Rights Reserved.
 * 
 * This 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 software 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
 * along with this software; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
 * USA.
 */

// -=- Logger_file.cxx - Logger instance for a file

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <limits.h>
#include <stdlib.h>
#include <string.h>

#include <os/Mutex.h>

#include <rfb/Logger_file.h>

using namespace rfb;

Logger_File::Logger_File(const char* loggerName)
  : Logger(loggerName), indent(13), width(79), m_file(0),
    m_lastLogTime(0)
{
  m_filename[0] = '\0';
  mutex = new os::Mutex();
}

Logger_File::~Logger_File()
{
  closeFile();
  delete mutex;
}

void Logger_File::write(int /*level*/, const char *logname, const char *message)
{
  os::AutoMutex a(mutex);

  if (!m_file) {
    if (m_filename[0] == '\0')
      return;
    char bakFilename[PATH_MAX];
    if (snprintf(bakFilename, sizeof(bakFilename),
                 "%s.bak", m_filename) >= (int)sizeof(bakFilename)) {
      remove(m_filename);
    } else {
      remove(bakFilename);
      rename(m_filename, bakFilename);
    }
    m_file = fopen(m_filename, "w+");
    if (!m_file) return;
  }

  time_t current = time(0);
  if (current != m_lastLogTime) {
    m_lastLogTime = current;
    fprintf(m_file, "\n%s", ctime(&m_lastLogTime));
  }

  fprintf(m_file," %s:", logname);
  int column = strlen(logname) + 2;
  if (column < indent) {
    fprintf(m_file,"%*s",indent-column,"");
    column = indent;
  }
  while (true) {
    const char* s = strchr(message, ' ');
    int wordLen;
    if (s) wordLen = s-message;
    else wordLen = strlen(message);

    if (column + wordLen + 1 > width) {
      fprintf(m_file,"\n%*s",indent,"");
      column = indent;
    }
    fprintf(m_file," %.*s",wordLen,message);
    column += wordLen + 1;
    message += wordLen + 1;
    if (!s) break;
  }
  fprintf(m_file,"\n");
  fflush(m_file);
}

void Logger_File::setFilename(const char* filename)
{
  closeFile();
  m_filename[0] = '\0';
  if (strlen(filename) >= sizeof(filename))
    return;
  strcpy(m_filename, filename);
}

void Logger_File::setFile(FILE* file)
{
  closeFile();
  m_file = file;
}

void Logger_File::closeFile()
{
  if (m_file) {
    fclose(m_file);
    m_file = 0;
  }
}

static Logger_File logger("file");

bool rfb::initFileLogger(const char* filename) {
  logger.setFilename(filename);
  logger.registerLogger();
  return true;
}