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/*! \file stringbuf.h

 *  \brief The counted string object

 *

 * This is the byte-counted string class for rsyslog. It is a replacement

 * for classical \0 terminated string functions. We introduce it in

 * the hope it will make the program more secure, obtain some performance

 * and, most importantly, lay they foundation for syslog-protocol, which

 * requires strings to be able to handle embedded \0 characters.

 *

 * \author  Rainer Gerhards <rgerhards@adiscon.com>

 * \date    2005-09-07

 *          Initial version  begun.

 *

 * All functions in this "class" start with rsCStr (rsyslog Counted String).

 * Copyright 2005

 *     Rainer Gerhards and Adiscon GmbH. All Rights Reserved.

 *

 * This file is part of rsyslog.

 *

 * Rsyslog 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 3 of the License, or

 * (at your option) any later version.

 *

 * Rsyslog 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 Rsyslog.  If not, see <http://www.gnu.org/licenses/>.

 *

 * A copy of the GPL can be found in the file "COPYING" in this distribution.

 */
#ifndef _STRINGBUF_H_INCLUDED__

#define _STRINGBUF_H_INCLUDED__ 1


/** 

 * The dynamic string buffer object.

 */
struct rsCStrObject
{	
#ifndef	NDEBUG

	rsObjID OID;		/**< object ID */
#endif

	uchar *pBuf;		/**< pointer to the string buffer, may be NULL if string is empty */
	uchar *pszBuf;		/**< pointer to the sz version of the string (after it has been created )*/
	size_t iBufSize;	/**< current maximum size of the string buffer */
	size_t iStrLen;		/**< length of the string in characters. */
	size_t iAllocIncrement;	/**< the amount of bytes the string should be expanded if it needs to */
};
typedef struct rsCStrObject rsCStrObj;


/**

 * Construct a rsCStr object.

 */
rsCStrObj *rsCStrConstruct(void);
rsRetVal rsCStrConstructFromszStr(rsCStrObj **ppThis, uchar *sz);
rsRetVal rsCStrConstructFromCStr(rsCStrObj **ppThis, rsCStrObj *pFrom);

/**

 * Destruct the string buffer object.

 */
void rsCStrDestruct(rsCStrObj *pThis);

/**

 * Append a character to an existing string. If necessary, the

 * method expands the string buffer.

 *

 * \param c Character to append to string.

 */
rsRetVal rsCStrAppendChar(rsCStrObj *pThis, uchar c);

/**

 * Finish the string buffer dynamic allocation.

 */
rsRetVal rsCStrFinish(rsCStrObj *pThis);

/**

 * Truncate "n" number of characters from the end of the

 * string. The buffer remains unchanged, just the

 * string length is manipulated. This is for performance

 * reasons.

 */
rsRetVal rsCStrTruncate(rsCStrObj *pThis, size_t nTrunc);

rsRetVal rsCStrTrimTrailingWhiteSpace(rsCStrObj *pThis);

/**

 * Append a string to the buffer. For performance reasons,

 * use rsCStrAppenStrWithLen() if you know the length.

 *

 * \param psz pointer to string to be appended. Must not be NULL.

 */
rsRetVal rsCStrAppendStr(rsCStrObj *pThis, uchar* psz);

/**

 * Append a string to the buffer.

 *

 * \param psz pointer to string to be appended. Must not be NULL.

 * \param iStrLen the length of the string pointed to by psz

 */
rsRetVal rsCStrAppendStrWithLen(rsCStrObj *pThis, uchar* psz, size_t iStrLen);

/**

 * Set a new allocation incremet. This will influence

 * the allocation the next time the string will be expanded.

 * It can be set and changed at any time. If done immediately

 * after custructing the StrB object, this will also be

 * the inital allocation.

 *

 * \param iNewIncrement The new increment size

 *

 * \note It is possible to use a very low increment, e.g. 1 byte.

 *       This can generate a considerable overhead. We highly 

 *       advise not to use an increment below 32 bytes, except

 *       if you are very well aware why you are doing it ;)

 */
void rsCStrSetAllocIncrement(rsCStrObj *pThis, int iNewIncrement);

/**

 * Append an integer to the string. No special formatting is

 * done.

 */
rsRetVal rsCStrAppendInt(rsCStrObj *pThis, int i);


uchar*  rsCStrGetSzStr(rsCStrObj *pThis);
uchar*  rsCStrGetSzStrNoNULL(rsCStrObj *pThis);
rsRetVal rsCStrSetSzStr(rsCStrObj *pThis, uchar *pszNew);
rsRetVal rsCStrConvSzStrAndDestruct(rsCStrObj *pThis, uchar **ppSz, int bRetNULL);
int rsCStrCStrCmp(rsCStrObj *pCS1, rsCStrObj *pCS2);
int rsCStrSzStrCmp(rsCStrObj *pCS1, uchar *psz, size_t iLenSz);
int rsCStrOffsetSzStrCmp(rsCStrObj *pCS1, size_t iOffset, uchar *psz, size_t iLenSz);
int rsCStrLocateSzStr(rsCStrObj *pCStr, uchar *sz);
int rsCStrLocateInSzStr(rsCStrObj *pThis, uchar *sz);
int rsCStrStartsWithSzStr(rsCStrObj *pCS1, uchar *psz, size_t iLenSz);
int rsCStrSzStrStartsWithCStr(rsCStrObj *pCS1, uchar *psz, size_t iLenSz);
int rsCStrSzStrMatchRegex(rsCStrObj *pCS1, uchar *psz);

/* now come inline-like functions */
#ifdef NDEBUG

#	define rsCStrLen(x) ((int)((x)->iStrLen))

#else

	int rsCStrLen(rsCStrObj *pThis);
#endif


#define rsCStrGetBufBeg(x) ((x)->pBuf)


#endif /* single include */