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/***************************************************************************
 $RCSfile$
                             -------------------
    cvs         : $Id$
    begin       : Sun Dec 05 2003
    copyright   : (C) 2003 by Martin Preuss
    email       : martin@libchipcard.de

 ***************************************************************************
 *                                                                         *
 *   This library is free software; you can redistribute it and/or         *
 *   modify it under the terms of the GNU Lesser General Public            *
 *   License as published by the Free Software Foundation; either          *
 *   version 2.1 of the License, or (at your option) any later version.    *
 *                                                                         *
 *   This library 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     *
 *   Lesser General Public License for more details.                       *
 *                                                                         *
 *   You should have received a copy of the GNU Lesser General Public      *
 *   License along with this library; if not, write to the Free Software   *
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef GWEN_LOGGER_H
#define GWEN_LOGGER_H

#ifdef __cplusplus
extern "C" {
#endif

#define GWEN_LOGDOMAIN "gwenhywfar"

#include <gwenhywfar/gwenhywfarapi.h>
#include <gwenhywfar/buffer.h>


typedef void GWENHYWFAR_CB (*GWEN_LOGGERFUNCTIONLOG)(const char *s);

typedef enum {
  GWEN_LoggerType_Console,
  GWEN_LoggerType_File,
  GWEN_LoggerType_Syslog,
  GWEN_LoggerType_Function,

  GWEN_LoggerType_Unknown=9999
} GWEN_LOGGER_LOGTYPE;


typedef enum {
  GWEN_LoggerFacility_Auth=0,
  GWEN_LoggerFacility_Daemon,
  GWEN_LoggerFacility_Mail,
  GWEN_LoggerFacility_News,
  GWEN_LoggerFacility_User,

  GWEN_LoggerFacility_Unknown=9999
} GWEN_LOGGER_FACILITY;


typedef enum {
  GWEN_LoggerLevel_Emergency=0,
  GWEN_LoggerLevel_Alert,
  GWEN_LoggerLevel_Critical,
  GWEN_LoggerLevel_Error,
  GWEN_LoggerLevel_Warning,
  GWEN_LoggerLevel_Notice,
  GWEN_LoggerLevel_Info,
  GWEN_LoggerLevel_Debug,
  GWEN_LoggerLevel_Verbous,

  GWEN_LoggerLevel_Unknown=9999
} GWEN_LOGGER_LEVEL;




/**
 * Checks whether a given log domain already exists.
 * @return 1 if it exists, 0 otherwise
 */
GWENHYWFAR_API int GWEN_Logger_Exists(const char *logDomain);


/**
 * Sets up logging. It automatically enables logging.
 * @author Martin Preuss<martin@libchipcard.de>
 * @param ident this string is prepended to each message logged to identify
 * the logging program
 * @param file name of the file to log to. If this is empty and syslog is
 * available, then all messages are logged via syslog. If syslog is not
 * available, all messages are logged to the console.
 * @param logtype how to log (via syslog, to a file, to the console etc)
 * @param facility what kind of program the log message comes from
 */
GWENHYWFAR_API int GWEN_Logger_Open(const char *logDomain,
                                    const char *ident,
                                    const char *file,
                                    GWEN_LOGGER_LOGTYPE logtype,
                                    GWEN_LOGGER_FACILITY facility);

/**
 * Shuts down logging. Automatically disables logging.
 * @author Martin Preuss<martin@libchipcard.de>
 */
GWENHYWFAR_API void GWEN_Logger_Close(const char *logDomain);

/**
 * Checks whether the logger for the given logDomain is open or not.
 */
GWENHYWFAR_API int GWEN_Logger_IsOpen(const char *logDomain);


/**
 * Log a message.
 * @author Martin Preuss<martin@libchipcard.de>
 * @param priority priority of the message
 * @param s string to log. This string is cut at all occurences of a newline
 * character thus splitting it into multiple log lines if necessary
 */
GWENHYWFAR_API int GWEN_Logger_Log(const char *logDomain,
                                   GWEN_LOGGER_LEVEL priority, const char *s);

/**
 * Enables or disables logging.
 * @author Martin Preuss<martin@libchipcard.de>
 * @param f if 0 then logging is disabled, otherwise it is enabled
 */
GWENHYWFAR_API void GWEN_Logger_Enable(const char *logDomain,
                                       int f);

/**
 * Checks whether logging is enabled.
 * @author Martin Preuss<martin@libchipcard.de>
 * @return 0 if disabled, 1 otherwise
 */
GWENHYWFAR_API int GWEN_Logger_IsEnabled(const char *logDomain);

/**
 * Sets the logger level. All messages with a priority up to the given one
 * will be logged, all others will not.
 * @author Martin Preuss<martin@libchipcard.de>
 * @param l maximum level to be logged
 */
GWENHYWFAR_API void GWEN_Logger_SetLevel(const char *logDomain,
    GWEN_LOGGER_LEVEL l);

/**
 * Returns the current log level.
 * @author Martin Preuss<martin@libchipcard.de>
 */
GWENHYWFAR_API int GWEN_Logger_GetLevel(const char *logDomain);


/**
 * Set ident string. This string is prepended to every log message and
 * should contain the name of the running program.
 * @author Martin Preuss<martin@libchipcard.de>
 */
GWENHYWFAR_API void GWEN_Logger_SetIdent(const char *logDomain,
    const char *id);

/**
 * Set the name of the file to be used when logging to a file.
 */
void GWEN_Logger_SetFilename(const char *logDomain, const char *name);


/**
 * Set logging function. This function is used to log messages in mode
 * LoggerTypeFunction.
 * @author Martin Preuss<martin@libchipcard.de>
 */
GWENHYWFAR_API
GWEN_LOGGERFUNCTIONLOG GWEN_Logger_SetLogFunction(const char *logDomain,
    GWEN_LOGGERFUNCTIONLOG fn);

/**
 * Transforms an ASCII string to a level value.
 */
GWENHYWFAR_API
GWEN_LOGGER_LEVEL GWEN_Logger_Name2Level(const char *name);


/**
 * Transforms a logger level to an ASCII string (for config files,
 * command line options etc).
 */
GWENHYWFAR_API
const char *GWEN_Logger_Level2Name(GWEN_LOGGER_LEVEL level);


/**
 * Transforms an ASCII string into the corresponding log type.
 */
GWENHYWFAR_API
GWEN_LOGGER_LOGTYPE GWEN_Logger_Name2Logtype(const char *name);

/**
 * Transforms a log type into an ASCII string.
 */
GWENHYWFAR_API
const char *GWEN_Logger_Logtype2Name(GWEN_LOGGER_LOGTYPE lt);


/**
 * This function can be used to generate log messages from within log hooks.
 */
GWENHYWFAR_API
int GWEN_Logger_CreateLogMessage(const char *logDomain,
                                 GWEN_LOGGER_LEVEL priority, const char *s,
                                 GWEN_BUFFER *mbuf);


#ifdef __cplusplus
}
#endif


#endif /* #ifndef CH_LOGGER_H */