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added BSD license

/*************************************************************************
* (C) 2008 AITNET ltd - Sofia/Bulgaria - <misho@aitbg.com>
*  by Michael Pounov <misho@openbsd-bg.org>
*
* $Author: misho $
* $Id: parse.c,v 1.5.2.3 2011/05/01 17:23:29 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"


// cfgDbg() Debug/Log operation
static inline int cfgDbg(FILE *f, char *fmt, ...)
{
	int ret = 0;
	va_list lst;

	va_start(lst, fmt);
	ret = vfprintf(f, fmt, lst);
	va_end(lst);

	return ret;
}

/*
 * InvertQueue() InvertQueue order //{cfg} list of elements for revert
 * @cfg = Head list element for revert 
*/
static inline void InvertQueue(sl_config * __restrict cfg)
{
	struct tagPair *item, *next, *prev = NULL;

	for (item = cfg->slh_first; item; item = next) {
		next = item->sle_next;
		item->sle_next = prev;
		prev = item;
	}
	cfg->slh_first = prev;
}

// cfgWrite() Write to file from config list
static inline int cfgWrite(FILE *f, sl_config * __restrict cfg, int whitespace)
{
	struct tagPair *av;
	time_t tim;
	char szTime[MAX_STR + 1];
	u_char szSection[MAX_STR + 1];

	bzero(szSection, MAX_STR + 1);

	bzero(szTime, MAX_STR + 1);
	time(&tim);
	strftime(szTime, MAX_STR, "(UTC) %Y-%m-%d %H:%M:%S", gmtime(&tim));
	if (!cfgDbg(f, "## Write Config :: %s\n#\n", szTime)) {
		LOGERR;
		return -1;
	}

	InvertQueue(cfg);
	for (av = cfg->slh_first; av; av = av->sle_next) {
		if (av->psSection && strcmp((char*) av->psSection, (char*) szSection)) {
			strlcpy((char*) szSection, (char*) av->psSection, MAX_STR + 1);
			if (!cfgDbg(f, "\n[%s]\n", av->psSection)) {
				LOGERR;
				return -1;
			}
		}
		if (!av->psSection && *szSection) {
			bzero(szSection, MAX_STR + 1);
			if (!cfgDbg(f, "\n[]\n")) {
				LOGERR;
				return -1;
			}
		}

		if (whitespace) {
			if (!cfgDbg(f, "%s = %s\n", av->psAttribute, av->psValue)) {
				LOGERR;
				return -1;
			}
		} else {
			if (!cfgDbg(f, "%s=%s\n", av->psAttribute, av->psValue)) {
				LOGERR;
				return -1;
			}
		}
	}
	InvertQueue(cfg);

	bzero(szTime, MAX_STR + 1);
	time(&tim);
	strftime(szTime, MAX_STR, "(UTC) %Y-%m-%d %H:%M:%S", gmtime(&tim));
	if (!cfgDbg(f, "\n#\n## Done. :: %s\n", szTime)) {
		LOGERR;
		return -1;
	}

	return 0;
}

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

/*
 * 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)
{
	u_char szLine[MAX_STR + 1];
	u_char szSection[MAX_STR + 1], *psAttr, *psVal;
	int pos;
	struct tagPair *av;

	memset(szSection, 0, MAX_STR + 1);
	while (!feof(f)) {
		memset(szLine, 0, MAX_STR + 1);
		fgets((char*) szLine, MAX_STR, f);
		io_TrimStr(szLine);
#ifdef __DEBUG
		cfgDbg(stdout, "DEBUG:: RAW |%s|\n", szLine);
#endif

		// End of config
		if (*szLine == '.')
			break;
		// Comment
		if (*szLine == '#' || *szLine == ';' || !*szLine)
			continue;

#ifdef __DEBUG
		cfgDbg(stdout, "DEBUG:: Clean |%s|\n", szLine);
#endif

		// Section
		if (*szLine == '[') {
			pos = strlen((char*) szLine) - 1;
			if (szLine[pos] != ']') {
#ifdef __DEBUG
				cfgDbg(stdout, "WARNING:: Ignore section %s ... not closed breket\n", szLine);
#endif
			} else {
				szLine[pos] = 0; 
				strncpy((char*) szSection, (char*) szLine + 1, MAX_STR);
#ifdef __DEBUG
				cfgDbg(stdout, "DEBUG:: Section %s\n", szSection);
#endif
			}
			continue;
		}

		// Devide pairs
		pos = strchr((char*) szLine, '=') ? strchr((char*) szLine, '=') - (char*) szLine : 0;
		if (!pos) {
#ifdef __DEBUG
			cfgDbg(stdout, "WARNING:: Ignore a/v %s ... format error!\n", szLine);
#endif
			continue;
		} else {
			av = malloc(sizeof(struct tagPair));
			if (!av) {
				LOGERR;
				return -1;
			} else {
				memset(av, 0, sizeof(struct tagPair));
				// added new element
				av->sle_next = cfg->slh_first;
				cfg->slh_first = av;
			}
			// added section name to element
			if (*szSection) {
				av->psSection = malloc(strlen((char*) szSection) + 1);
				if (!av->psSection) {
					LOGERR;
					free(av);
					return -1;
				} else
					strlcpy((char*) av->psSection, (char*) szSection, strlen((char*) szSection) + 1);
			} else
				av->psSection = NULL;

			psAttr = szLine;
			psVal = (szLine + pos + 1);
			szLine[pos] = 0;
			io_RTrimStr(psAttr);
			io_LTrimStr(psVal);
			io_UnquotStr(psVal);
#ifdef __DEBUG
			cfgDbg(stdout, "DEBUG:: Attr(%p) ->%s size=%d Value(%p) ->%s size=%d\n", 
					psAttr, psAttr, strlen((char*) psAttr), psVal, psVal, strlen((char*) psVal));
#endif
			// added attribute to element
			av->psAttribute = malloc(strlen((char*) psAttr) + 1);
			if (!av->psAttribute) {
				LOGERR;
				free(av->psSection);
				free(av);
				return -1;
			} else
				strlcpy((char*) av->psAttribute, (char*) psAttr, strlen((char*) psAttr) + 1);
			// added value to element
			av->psValue = malloc(strlen((char*) psVal) + 1);
			if (!av->psValue) {
				LOGERR;
				free(av->psAttribute);
				free(av->psSection);
				free(av);
				return -1;
			} else
				strlcpy((char*) av->psValue, (char*) psVal, strlen((char*) psVal) + 1);
		}
	}

	return 0;
}

/*
 * 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)
{
	return cfgWrite(f, cfg, 1);
}

/*
 * 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)
{
	return cfgWrite(f, cfg, 0);
}

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

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

	for (item = cfg->slh_first; item->sle_next; item = item->sle_next);
	item->sle_next = add_cfg->slh_first;

	add_cfg->slh_first = NULL;

	return ret;
}

/*
 * 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)
{
	struct tagPair *item, *merge, *add_next, *next = NULL;
	int flg;

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

	item = add_cfg->slh_first;
	while (item) {
		add_next = item->sle_next;

		for (flg = 0, merge = cfg->slh_first, next = merge->sle_next; next; 
				merge = merge->sle_next, next = merge->sle_next) {
			if (!merge->psSection && !item->psSection) {
				flg = 1;
				merge->sle_next = item;
				item->sle_next = next;
				break;
			}
			if (merge->psSection && item->psSection && 
					!strcmp((char*) merge->psSection, (char*) item->psSection)) {
				flg = 1;
				merge->sle_next = item;
				item->sle_next = next;
				break;
			}
		}

		if (!flg) {
			if (!merge->sle_next) {
				merge->sle_next = item;
				item->sle_next = NULL;
			} else
				return -1;
		}

		item = add_next;
	}

	add_cfg->slh_first = NULL;

	return 0;
}