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/*************************************************************************
* (C) 2008 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
*  by Michael Pounov <misho@openbsd-bg.org>
*
* $Author: misho $
* $Id: aitcfg.h,v 1.6 2011/05/01 17:24:28 misho Exp $
*
**************************************************************************
The ELWIX and AITNET software is distributed under the following
terms:

All of the documentation and software included in the ELWIX and AITNET
Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>

Copyright 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
	by Michael Pounov <misho@elwix.org>.  All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
   must display the following acknowledgement:
This product includes software developed by Michael Pounov <misho@elwix.org>
ELWIX - Embedded LightWeight unIX and its contributors.
4. Neither the name of AITNET nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
#ifndef __AITCFG_H
#define __AITCFG_H


struct tagPair {
	unsigned int	uLine;
	unsigned char	*psSection;
	unsigned char	*psAttribute;
	unsigned char	*psValue;
	struct tagPair *sle_next;
};

struct tagHead {
	struct tagPair *slh_first;
};
typedef struct tagHead sl_config;


/*
 * Macros for config library. Typecast string to specific config string format.
*/
#define CFG(x)		(unsigned char *)(x)

#define CFG_ISSET(x)	((long) cfg_FirstItem((x)))


/*
 * InitConfig() Head initializing function for config
 * @cfg = New head element for init
 * return: 0 ok; -1 error:: new head element is null
*/
inline int InitConfig(sl_config * __restrict cfg);
/*
 * cfg_CreateConfig() Create config file from memory without whitespaces!
 * @csConfigName = New config filename
 * @cfg = Head list element
 * return: 0 ok; -1 error:: can`t save new config
*/
int cfg_CreateConfig(const char *csConfigName, sl_config * __restrict cfg);
/*
 * CreateConfig() Create config file from memory
 * @csConfigName = New config filename
 * @cfg = Head list element
 * return: 0 ok; -1 error:: can`t save new config
*/
int CreateConfig(const char *csConfigName, sl_config * __restrict cfg);
/*
 * LoadConfig() Load config from file
 * @csConfigName = Filename of config
 * @cfg = Head list element
 * return: 0 ok; -1 error:: can`t load config
*/
int LoadConfig(const char *csConfigName, sl_config * __restrict cfg);
/*
 * UnloadConfig() Unload config from memory and free resources
 * @cfg = Head list element
*/
void UnloadConfig(sl_config * __restrict cfg);


// cfg_GetErrno() Get error code of last operation
inline int cfg_GetErrno();
// cfg_GetError() Get error text of last operation
inline const char *cfg_GetError();


/*
 * ReadConfig() Read from file and add new item to config list
 * @f = file resource
 * @cfg = Head list element
 * return: 0 ok; -1 error:: can`t allocate memory
*/
int ReadConfig(FILE *f, sl_config * __restrict cfg);
/*
 * WriteConfig() Write to file from items in config list
 * @f = file resource
 * @cfg = Head list element
 * return: 0 ok; -1 error:: can`t write to file
*/
int WriteConfig(FILE *f, sl_config * __restrict cfg);

/*
 * cfg_WriteConfig() Write to file from items in config list without whitespaces!
 * @f = file resource
 * @cfg = Head list element
 * return: 0 ok; -1 error:: can`t write to file
*/
int cfg_WriteConfig(FILE *f, sl_config * __restrict cfg);

/*
 * ConcatConfig() Concat two list in one
 * @cfg = Head list element of main list
 * @add_cfg = Head list element of added list
 * return: 0 ok; -1 error:: can`t concat lists
*/
int ConcatConfig(sl_config * __restrict cfg, sl_config * __restrict add_cfg);

/*
 * MergeConfig() Marge two list in one cfg and destroy add_cfg
 * @cfg = Head list element of main list
 * @add_cfg = Head list element of merged list (destroy after all!)
 * return: 0 ok; -1 error:: can`t merge lists
*/
int MergeConfig(sl_config * __restrict cfg, sl_config * __restrict add_cfg);


/*
 * cfg_FindAttribute() Find attribute position in config list
 * @cfg = Head list element
 * @csSec = Config section //[{csSec}]
 * @csAttr = Config attribute //{csAttr} = ...
 * return: 0 not found item; -1 error: null parameters; >0 position in list
*/
inline int cfg_FindAttribute(sl_config * __restrict cfg, const u_char *csSec, const u_char *csAttr);
/*
 * cfg_SetAttribute() Set item in config list or add new item if not exists
 * @cfg = Head list element
 * @csSec = Config section //[{csSec}], if NULL set in *default* section
 * @csAttr = Config attribute //{csAttr} = ..., if NULL set as *any* attribute
 * @csVal = Config value //... = {csVal} to setup
 * return: 0 nothing changed, -1 error: not enough memory; 1 find and update item; 2 added new item
*/
int cfg_SetAttribute(sl_config * __restrict cfg, const u_char *csSec, const u_char *csAttr, const u_char *csVal);
/*
 * cfg_UnsetAttribute() Unset item from config list and free resources
 * @cfg = Head list element
 * @csSec = Config section //[{csSec}], if NULL unset in *default* section
 * @csAttr = Config attribute //{csAttr} = ..., if NULL unset as *any* attribute
 * return: 0 item not found, -1 error: null parameters; >0 position in list
*/
int cfg_UnsetAttribute(sl_config * __restrict cfg, const u_char *csSec, const u_char *csAttr);
/*
 * cfg_GetAttribute() Get item from config list and return his value
 * @cfg = Head list element
 * @csSec = Config section //[{csSec}], if NULL unset in *default* section
 * @csAttr = Config attribute //{csAttr} = ..., if NULL unset as *any* attribute
 * return: NULL item not found or null parameters; !=NULL value const string
*/
inline const u_char *cfg_GetAttribute(sl_config * __restrict cfg, const u_char *csSec, const u_char *csAttr);

/*
 * cfg_FirstItem() Get first item from config list and return his value
 * @cfg = Head list element
 * return: NULL if no items in list; !=NULL first pair item
*/
inline struct tagPair *cfg_FirstItem(sl_config * __restrict cfg);

/*
 * cfg_LoadAttribute() Extended get attribute, if not found item return *default value*
 * @cfg = Head list element
 * @csSec = Config section //[{csSec}], if NULL unset in *default* section
 * @csAttr = Config attribute //{csAttr} = ..., if NULL unset as *any* attribute
 * @psVal = Return buffer for item Value //... = {psVal}
 * @ValLen = Length of buffer //{psVal} for return
 * @csDefValue = *Default Value* for return in //{psVal}, if not found item in config list
 * return: 0 item not found, -1 error: null parameters; >0 number of copied bytes in //{psVal}
*/
int cfg_LoadAttribute(sl_config * __restrict cfg, const u_char *csSec, const u_char *csAttr, 
		u_char * __restrict psVal, int ValLen, const char *csDefValue);


#endif