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/* stringbuf.h
* 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.
*
* Copyright 2005-2012 Adiscon GmbH. All Rights Reserved.
*
* This file is part of the rsyslog runtime library.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
* -or-
* see COPYING.ASL20 in the source distribution
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _STRINGBUF_H_INCLUDED__
#define _STRINGBUF_H_INCLUDED__ 1
#include <assert.h>
/**
* The dynamic string buffer object.
*/
typedef struct cstr_s
{
#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. */
} cstr_t;
/**
* Construct a rsCStr object.
*/
rsRetVal cstrConstruct(cstr_t **ppThis);
#define rsCStrConstruct(x) cstrConstruct((x))
rsRetVal rsCStrConstructFromszStr(cstr_t **ppThis, uchar *sz);
rsRetVal rsCStrConstructFromCStr(cstr_t **ppThis, cstr_t *pFrom);
/**
* Destruct the string buffer object.
*/
void rsCStrDestruct(cstr_t **ppThis);
#define cstrDestruct(x) rsCStrDestruct((x))
/* Append a character to the current string object. This may only be done until
* cstrFinalize() is called.
* rgerhards, 2009-06-16
*/
rsRetVal rsCStrExtendBuf(cstr_t *pThis, size_t iMinNeeded); /* our helper, NOT a public interface! */
static inline rsRetVal cstrAppendChar(cstr_t *pThis, uchar c)
{
rsRetVal iRet = RS_RET_OK;
if(pThis->iStrLen >= pThis->iBufSize) {
CHKiRet(rsCStrExtendBuf(pThis, 1)); /* need more memory! */
}
/* ok, when we reach this, we have sufficient memory */
*(pThis->pBuf + pThis->iStrLen++) = c;
finalize_it:
return iRet;
}
/* some inline functions for things that are really frequently called... */
/* Finalize the string object. This must be called after all data is added to it
* but before that data is used.
* rgerhards, 2009-06-16
*/
static inline rsRetVal
cstrFinalize(cstr_t *pThis)
{
rsRetVal iRet = RS_RET_OK;
if(pThis->iStrLen > 0) {
/* terminate string only if one exists */
CHKiRet(cstrAppendChar(pThis, '\0'));
--pThis->iStrLen; /* do NOT count the \0 byte */
}
finalize_it:
return iRet;
}
/* Returns the cstr data as a classical C sz string. We use that the
* Finalizer did properly terminate our string (but we may stil be NULL).
* So it is vital that the finalizer is called BEFORe this function here!
* The caller must not free or otherwise manipulate the returned string and must not
* destroy the CStr object as long as the ascii string is used.
* This function may return NULL, if the string is currently NULL. This
* is a feature, not a bug. If you need non-NULL in any case, use
* cstrGetSzStrNoNULL() instead.
* Note that due to the new single-buffer interface this function almost does nothing!
* rgerhards, 2006-09-16
*/
static inline uchar* cstrGetSzStr(cstr_t *pThis)
{
rsCHECKVALIDOBJECT(pThis, OIDrsCStr);
return(pThis->pBuf);
}
/* Converts the CStr object to a classical sz string and returns that.
* Same restrictions as in cstrGetSzStr() applies (see there!). This
* function here guarantees that a valid string is returned, even if
* the CStr object currently holds a NULL pointer string buffer. If so,
* "" is returned.
* rgerhards 2005-10-19
* WARNING: The returned pointer MUST NOT be freed, as it may be
* obtained from that constant memory pool (in case of NULL!)
*/
static inline uchar* cstrGetSzStrNoNULL(cstr_t *pThis)
{
rsCHECKVALIDOBJECT(pThis, OIDrsCStr);
if(pThis->pBuf == NULL)
return (uchar*) "";
else
return cstrGetSzStr(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(cstr_t *pThis, size_t nTrunc);
rsRetVal rsCStrTrimTrailingWhiteSpace(cstr_t *pThis);
rsRetVal cstrTrimTrailingWhiteSpace(cstr_t *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(cstr_t *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(cstr_t *pThis, uchar* psz, size_t iStrLen);
/**
* Append an integer to the string. No special formatting is
* done.
*/
rsRetVal rsCStrAppendInt(cstr_t *pThis, long i);
rsRetVal strExit(void); /* TODO: remove once we have a real object interface! */
uchar* __attribute__((deprecated)) rsCStrGetSzStr(cstr_t *pThis);
uchar* rsCStrGetSzStrNoNULL(cstr_t *pThis);
rsRetVal rsCStrSetSzStr(cstr_t *pThis, uchar *pszNew);
int rsCStrCStrCmp(cstr_t *pCS1, cstr_t *pCS2);
int rsCStrSzStrCmp(cstr_t *pCS1, uchar *psz, size_t iLenSz);
int rsCStrOffsetSzStrCmp(cstr_t *pCS1, size_t iOffset, uchar *psz, size_t iLenSz);
int rsCStrLocateSzStr(cstr_t *pCStr, uchar *sz);
int rsCStrLocateInSzStr(cstr_t *pThis, uchar *sz);
int rsCStrCaseInsensitiveLocateInSzStr(cstr_t *pThis, uchar *sz);
int rsCStrStartsWithSzStr(cstr_t *pCS1, uchar *psz, size_t iLenSz);
int rsCStrCaseInsensitveStartsWithSzStr(cstr_t *pCS1, uchar *psz, size_t iLenSz);
int rsCStrSzStrStartsWithCStr(cstr_t *pCS1, uchar *psz, size_t iLenSz);
rsRetVal rsCStrSzStrMatchRegex(cstr_t *pCS1, uchar *psz, int iType, void *cache);
void rsCStrRegexDestruct(void *rc);
rsRetVal rsCStrConvertToNumber(cstr_t *pStr, number_t *pNumber);
rsRetVal rsCStrConvertToBool(cstr_t *pStr, number_t *pBool);
/* in migration */
#define rsCStrAppendCStr(pThis, pstrAppend) cstrAppendCStr(pThis, pstrAppend)
/* new calling interface */
rsRetVal cstrFinalize(cstr_t *pThis);
rsRetVal cstrConvSzStrAndDestruct(cstr_t *pThis, uchar **ppSz, int bRetNULL);
rsRetVal cstrAppendCStr(cstr_t *pThis, cstr_t *pstrAppend);
/* now come inline-like functions */
#ifdef NDEBUG
# define cstrLen(x) ((int)((x)->iStrLen))
#else
int cstrLen(cstr_t *pThis);
#endif
#define rsCStrLen(s) cstrLen((s))
#define rsCStrGetBufBeg(x) ((x)->pBuf)
rsRetVal strInit();
rsRetVal strExit();
#endif /* single include */
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