/*************************************************************************
* (C) 2008 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
*  by Michael Pounov <misho@openbsd-bg.org>
*
* $Author: misho $
* $Id: queue.c,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.
*/
#include "global.h"
#include "aitcfg.h"


/*
 * SelectAttribute() Select item //{tagPair} from config list with attribute parameter(s)
 * @cfg = Head list element
 * @csSec = Config section //[{csSec}], if NULL search in *default* section
 * @csAttr = Config attribute //{csAttr} = ..., if NULL search in *any* attribute
 * return: NULL not found attribute; //{tagPair} selected first seen attribute item from list
*/
static inline struct tagPair *SelectAttribute(sl_config * __restrict cfg, const u_char *csSec, const u_char *csAttr)
{
	struct tagPair *av;

	if (!cfg)
		return NULL;

	for (av = cfg->slh_first; av; av = av->sle_next) {
		if ((!csSec || !*csSec) && !av->psSection) {
			if (!csAttr)
				return av;
			if (!strcmp((char*) av->psAttribute, (char*) csAttr))
				return av;
		}
		if (csSec && av->psSection && !strcmp((char*) av->psSection, (char*) csSec)) {
			if (!csAttr)
				return av;
			if (!strcmp((char*) av->psAttribute, (char*) csAttr))
				return av;
		}
	}

	return NULL;
}

/*
 * DestroyAttribute() Free //{tagPair} item elements memory and destroy resource
 * @pair = Free this element
*/
static inline void DestroyAttribute(struct tagPair *pair)
{
	if (!pair)
		return;

	if (pair->psValue)
		free(pair->psValue);
	if (pair->psAttribute)
		free(pair->psAttribute);
	if (pair->psSection)
		free(pair->psSection);

	free(pair);
}

// ----------------------------------------------

/*
 * 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)
{
	struct tagPair *av;
	register int cx = 0;

	if (!cfg || !csAttr)
		return -1;

	for (av = cfg->slh_first; av; av = av->sle_next) {
		++cx;
		if ((!csSec || !*csSec) && !av->psSection)
			if (!strcmp((char*) av->psAttribute, (char*) csAttr))
				return cx;
		if (csSec && av->psSection && !strcmp((char*) av->psSection, (char*) csSec))
			if (!strcmp((char*) av->psAttribute, (char*) csAttr))
				return cx;
	}

	return 0;
}

/*
 * 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)
{
	struct tagPair *av, *curr;
	register int cx = 0;

	if (!cfg || !csAttr)
		return -1;

	av = SelectAttribute(cfg, csSec, csAttr);
	if (!av)
		return 0;

	// remove element
	//	remove element when is first!
	if (cfg->slh_first == av) {
		cfg->slh_first = cfg->slh_first->sle_next;

		DestroyAttribute(av);
		return 1;
	}
	//	remove element in other cases...
	curr = cfg->slh_first;
	while (curr->sle_next != av) {
		++cx;
		curr = curr->sle_next;
	}
	curr->sle_next = curr->sle_next->sle_next;

	DestroyAttribute(av);
	return cx;
}

/*
 * 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)
{
	struct tagPair *av, *section;
	int len;

	if (!cfg || !csAttr)
		return -1;

	av = SelectAttribute(cfg, csSec, csAttr);
	if (!av) {
		section = SelectAttribute(cfg, csSec, NULL);

		av = malloc(sizeof(struct tagPair));
		if (!av) {
			LOGERR;
			return -1;
		} else {
			memset(av, 0, sizeof(struct tagPair));

			if (!section) {
				// add new element
				av->sle_next = cfg->slh_first;
				cfg->slh_first = av;
			} else {
				// add new element in existing section
				av->sle_next = section->sle_next;
				section->sle_next = av;
			}
		}
		// added section name to element
		if (csSec && *csSec) {
			len = strlen((char*) csSec) + 1;
			av->psSection = malloc(len);
			if (!av->psSection) {
				LOGERR;
				free(av);
				return -1;
			} else {
				strlcpy((char*) av->psSection, (char*) csSec, len);
			}
		} else
			av->psSection = NULL;

		// added attribute to element
		len = strlen((char*) csAttr) + 1;
		av->psAttribute = malloc(len);
		if (!av->psAttribute) {
			LOGERR;
			free(av->psSection);
			free(av);
			return -1;
		} else {
			strlcpy((char*) av->psAttribute, (char*) csAttr, len);
		}
		// added value to element
		if (csVal && *csVal) {
			len = strlen((char*) csVal) + 1;
			av->psValue = malloc(len);
			if (!av->psValue) {
				LOGERR;
				free(av->psAttribute);
				free(av->psSection);
				free(av);
				return -1;
			} else {
				strlcpy((char*) av->psValue, (char*) csVal, len);
			}
		} else {
			av->psValue = malloc(1);
			*av->psValue = 0;
		}

		// Added new element
		return 2;
	}

	if (strcmp((char*) csVal, (char*) av->psValue)) {
		len = strlen((char*) csVal) + 1;
		av->psValue = realloc(av->psValue, len);
		strlcpy((char*) av->psValue, (char*) csVal, len);

		// Update element
		return 1;
	}

	// Nothing happens ... finded & values is equal!
	return 0;
}

/*
 * 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)
{
	struct tagPair *av;

	if (!cfg || !csAttr)
		return NULL;

	av = SelectAttribute(cfg, csSec, csAttr);
	if (!av)
		return NULL;

	return av->psValue;
}

/*
 * 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)
{
	return cfg->slh_first;
}

// --------------------------------------------------------------

/*
 * 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)
{
	struct tagPair *av;
	int ret = 0;

	if (!cfg || !csAttr || !ValLen || !psVal)
		return -1;

	av = SelectAttribute(cfg, csSec, csAttr);
	if (!av) {
		if (csDefValue) {
			strlcpy((char*) psVal, csDefValue, ValLen);
			ret = strlen((char*) psVal);
		}

		return ret;
	}

	if (!av->psValue || !*av->psValue) {
		if (csDefValue) {
			strlcpy((char*) psVal, csDefValue, ValLen);
			ret = strlen((char*) psVal);
		}
	} else {
		strlcpy((char*) psVal, (char*) av->psValue, ValLen);
		ret = strlen((char*) psVal);
	}

	return ret;
}