Log.cpp

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// Torc - Copyright 2011-2013 University of Southern California.  All Rights Reserved.
// $HeadURL$
// $Id$

// 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 3 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 along with this program.  If 
// not, see <http://www.gnu.org/licenses/>.

#ifdef HAVE_CONFIG_H
#include "torc/generic/config.h"
#endif //HAVE_CONFIG_H
#ifdef LOGGING
#include <cstdio>
#include <cstdarg>
#endif

#include "torc/generic/Log.hpp"

namespace {

#ifdef LOGGING

class Logger {
public:
    void write(const char *fmt, va_list ap);

    void openLogFile(const std::string& inFileName);

    Logger();
    ~Logger();

    static Logger* instance();

private:
    FILE *mStream;
};

void Logger::write(const char *fmt, va_list ap) {
    vfprintf(mStream, fmt, ap);
    return;
}

void Logger::openLogFile(const std::string& inFileName) {
    if(!inFileName.empty()) {
        FILE *fp = fopen(inFileName.c_str(), "w");
        if(fp) {
            if(mStream && mStream != stdout) {
                fclose(mStream);
            }
            mStream = fp;
        }
    }
}

Logger::Logger() : mStream(stdout) {}

Logger::~Logger() {
    if(mStream && mStream != stdout) {
        fclose(mStream);
        mStream = NULL;
    }
}

Logger* Logger::instance() {
    static Logger obj;
    return &obj;
}

#endif //LOGGING
}

namespace torc {
namespace generic {

void openLogFile(const std::string& logFileName) {
#ifdef LOGGING
    Logger::instance()->openLogFile(logFileName);
#endif
    return;
}

void log(const char *fmt, ...) {
#ifdef LOGGING
    va_list args;
    va_start(args, fmt);
    Logger::instance()->write(fmt, args);
    va_end(args);
#endif
    return;
}

} //namespace torc
} //namespace generic