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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 code is placed under the GPL.
*/
#ifndef __LIB3195_STRINGBUF_H_INCLUDED__
#define __LIB3195_STRINGBUF_H_INCLUDED__ 1
#define sbSTRBCHECKVALIDOBJECT(x) {assert(x != NULL); assert(x->OID == OIDrsCStr);}
/**
* The dynamic string buffer object.
*
*/
struct rsCStrObject
{
srObjID OID; /**< object ID */
char *pBuf; /**< pointer to the string buffer, may be NULL if string is empty */
char *pszBuf; /**< pointer to the sz version of the string (after it has been created )*/
int iBufSize; /**< current maximum size of the string buffer */
int iBufPtr; /**< pointer (index) of next character position to be written to. */
int iStrLen; /**< length of the string in characters. */
int 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);
/**
* 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.
*/
srRetVal rsCStrAppendChar(rsCStrObj *pThis, char c);
/**
* Finish the string buffer. That means, the string
* is returned to the caller and then the string
* buffer is destroyed. The caller is reponsible for
* freeing the returned string pointer.
*
* After calling this method, the string buffer object
* is destroyed and thus the provided handle (pThis)
* can no longer be used.
*
* \retval pointer to \0 terminated string. May be NULL
* (empty string) and MUST be free()ed by caller.
*/
void rsCStrFinish(rsCStrObj *pThis);
/**
* Append a string to the buffer.
*
* \param psz pointer to string to be appended. Must not be NULL.
*/
srRetVal rsCStrAppendStr(rsCStrObj *pThis, char* psz);
/**
* 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.
*/
srRetVal rsCStrAppendInt(rsCStrObj *pThis, int i);
#endif
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