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// Copyright (C) 1999-2005 Open Source Telecom Corporation.
// Copyright (C) 2006-2010 David Sugar, Tycho Softworks.
//
// 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
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
//
// This exception applies only to the code released under the name GNU
// Common C++.  If you copy code from other releases into a copy of GNU
// Common C++, as the General Public License permits, the exception does
// not apply to the code that you add in this way.  To avoid misleading
// anyone as to the status of such modified files, you must delete
// this exception notice from them.
//
// If you write modifications of your own for GNU Common C++, it is your choice
// whether to permit this exception to apply to your modifications.
// If you do not wish that, delete this exception notice.
//

/**
 * @file slog.h
 * @short System logging facilities abstraction.
 **/

#ifndef CCXX_SLOG_H_
#define CCXX_SLOG_H_

#ifndef CCXX_MISSING_H_
#include <cc++/missing.h>
#endif

#ifndef CCXX_THREAD_H_
#include <cc++/thread.h>
#endif

#ifndef HAVE_SYSLOG_H
#include <cstdio>
#endif

#ifdef  CCXX_NAMESPACES
namespace ost {
#endif

/**
 * The slog class is used to stream messages to the system's logging facility (syslogd).
 * A default <code>slog</code> object is used to avoid confusion with the native syslog
 * facility and to imply a logical relationship to the C++ <code>clog()</code>.
 *
 * The key difference is that the <code>slog</code> object sends it's output to the
 * system logging daemon (typically syslogd) rather than through stderr.
 * <code>slog</code> can be streamed with the <code><<</code> operator just
 * like <code>clog</code>; a default slog object is pre-initialized, and you stream
 * character data to it.
 *
 * The <code>slog</code> allows one to specify logging levels and other properties through the <code>()</code> operators.
 * Hence, once can do:
 *
 * <code><pre>
 * slog("mydaemon", SLOG_DAEMON, SLOG_EMERGENCY) << I just died << endl; </pre></code>
 *
 * or things like:
 *
 * <code><pre>
 * slog("mydaemon", SLOG_DAEMON);
 * slog(SLOG_INFO) << "daemon initalized" << endl; </pre></code>
 *
 * The intent is to be as common-place and as convenient to use as the stderr based clog facility
 * found in C++, and this is especially useful for C++ daemons.
 *
 * The <code>std::flush</code> manipulator doesn't work.  Either the
 * <code>std::endl</code> or <code>std::ends</code> manipulators
 * must be used to cause the output to be sent to the daemon.
 *
 * When this class is used on a system that doesn't have the syslog headers
 * (i.e. a non-posix win32 box), the output goes to the a file with the same name
 * as the syslog identifier string with '.log' appended to it.  If the identifier string ends in
 * '.exe', the '.exe' is removed before the '.log' is appened. (e.g. the identifier foo.exe will
 * generate a log file named foo.log)
 *
 * @author David Sugar <dyfet@ostel.com>
 * <br>Minor docs & hacks by Jon Little <littlej@arlut.utexas.edu>
 *
 * @short system logging facility class.
 */
class __EXPORT Slog : protected std::streambuf, public std::ostream
{
public:
    typedef enum Class {
        classSecurity,
        classAudit,
        classDaemon,
        classUser,
        classDefault,
        classLocal0,
        classLocal1,
        classLocal2,
        classLocal3,
        classLocal4,
        classLocal5,
        classLocal6,
        classLocal7
    } Class;

    typedef enum Level {
        levelEmergency = 1,
        levelAlert,
        levelCritical,
        levelError,
        levelWarning,
        levelNotice,
        levelInfo,
        levelDebug
    } Level;

private:
#ifndef HAVE_SYSLOG_H
    Mutex lock;
    FILE *syslog;
#endif
    int priority;
    Level  _level;
    bool _enable;
    bool _clogEnable;

    ThreadImpl *getPriv(void);

protected:
    /**
     * This is the streambuf function that actually outputs the data
     * to the device.  Since all output should be done with the standard
     * ostream operators, this function should never be called directly.
     */
    int overflow(int c);

public:
    /**
     * Default (and only) constructor.  The default log level is set to
     * SLOG_DEBUG.  There is no default log facility set.  One should be
     * set before attempting any output.  This is done by the <code>open()</code> or the
     * <code>operator()(const char*, Class, Level)</code>
     * functions.
     */
    Slog(void);

    virtual ~Slog(void);

    void close(void);

    /**
     * (re)opens the output stream.
     * @param ident The identifier portion of the message sent to the syslog daemon.
     * @param grp The log facility the message is sent to
     */
    void open(const char *ident, Class grp = classUser);

    /**
     * Sets the log identifier, level, and class to use for subsequent output
     * @param ident The identifier portion of the message
     * @param grp The log facility the message is sent to
     * @param level The log level of the message
     */
    Slog &operator()(const char *ident, Class grp = classUser,
             Level level = levelError);

    /**
     * Changes the log level and class to use for subsequent output
     * @param level The log level of the message
     * @param grp The log facility the message is sent to
     */
    Slog &operator()(Level level, Class grp = classDefault);

    /**
     * Does nothing except return *this.
     */
    Slog &operator()(void);

#ifdef  HAVE_SNPRINTF
    /**
     * Print a formatted syslog string.
     *
     * @param format string.
     */
    void error(const char *format, ...);

    /**
     * Print a formatted syslog string.
     *
     * @param format string.
     */
    void warn(const char *format, ...);

    /**
     * Print a formatted syslog string.
     *
     * @param format string.
     */
    void debug(const char *format, ...);

    /**
     * Print a formatted syslog string.
     *
     * @param format string.
     */
    void emerg(const char *format, ...);

    /**
     * Print a formatted syslog string.
     *
     * @param format string.
     */
    void alert(const char *format, ...);

    /**
     * Print a formatted syslog string.
     *
     * @param format string.
     */
    void critical(const char *format, ...);

    /**
     * Print a formatted syslog string.
     *
     * @param format string.
     */
    void notice(const char *format, ...);

    /**
     * Print a formatted syslog string.
     *
     * @param format string.
     */
    void info(const char *format, ...);
#endif

    /**
     * Sets the logging level.
     * @param enable is the logging level to use for further output
     */
    inline void level(Level enable)
        {_level = enable;};

    /**
     * Enables or disables the echoing of the messages to clog in addition
     * to the syslog daemon.  This is enabled by the default class constructor.
     * @param f true to enable, false to disable clog output
     */
    inline void clogEnable(bool f=true)
        {_clogEnable = f;};

    inline Slog &warn(void)
        {return operator()(Slog::levelWarning);};

    inline Slog &error(void)
        {return operator()(Slog::levelError);};

    inline Slog &debug(void)
        {return operator()(Slog::levelDebug);};

    inline Slog &emerg(void)
        {return operator()(Slog::levelEmergency);};

    inline Slog &alert(void)
        {return operator()(Slog::levelAlert);};

    inline Slog &critical(void)
        {return operator()(Slog::levelCritical);};

    inline Slog &notice(void)
        {return operator()(Slog::levelNotice);};

    inline Slog &info(void)
        {return operator()(Slog::levelInfo);};

};

//#ifdef    CYGWIN_IMPORTS
//extern __declspec(dllimport) Slog slog;
//#else
extern __EXPORT Slog    slog;
//#endif

#ifdef  CCXX_NAMESPACES
}
#endif

#endif

/** EMACS **
 * Local variables:
 * mode: c++
 * c-basic-offset: 4
 * End:
 */