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// File: LDOM_OSStream.cxx
// Created: 01.10.01 10:57:37
// Author: Julia DOROVSKIKH
// Copyright: Open Cascade 2001
// History:
#include <LDOM_OSStream.hxx>
#include <string.h>
#include <Standard_Integer.hxx>
// One element of sequence
class LDOM_StringElem
{
char* buf; // pointer on data string
int len; // quantity of really written data
LDOM_StringElem* next; // pointer on the next element of a sequence
LDOM_StringElem (int aLen)
{
buf = new char[aLen];
len = 0;
next = 0;
}
~LDOM_StringElem ()
{
delete [] buf;
if (next) delete next;
}
friend class LDOM_SBuffer;
};
//=======================================================================
//function : LDOM_SBuffer()
//purpose :
//=======================================================================
LDOM_SBuffer::LDOM_SBuffer (const Standard_Integer theMaxBuf)
: myMaxBuf (theMaxBuf), myLength(0)
{
myFirstString = new LDOM_StringElem (theMaxBuf);
myCurString = myFirstString;
}
//=======================================================================
//function : ~LDOM_SBuffer()
//purpose :
//=======================================================================
LDOM_SBuffer::~LDOM_SBuffer ()
{
if (myFirstString) delete myFirstString;
}
//=======================================================================
//function : Clear()
//purpose :
//=======================================================================
void LDOM_SBuffer::Clear ()
{
if (myFirstString->next) delete myFirstString->next;
myFirstString->next = 0;
myFirstString->len = 0;
myLength = 0;
myCurString = myFirstString;
}
//=======================================================================
//function : str()
//purpose :
//=======================================================================
Standard_CString LDOM_SBuffer::str () const
{
char* aRetStr = new char [myLength + 1];
LDOM_StringElem* aCurElem = myFirstString;
int aCurLen = 0;
while (aCurElem)
{
strncpy(aRetStr + aCurLen, aCurElem->buf, aCurElem->len);
aCurLen += aCurElem->len;
aCurElem = aCurElem->next;
}
*(aRetStr + myLength) = '\0';
return aRetStr;
}
//=======================================================================
//function : overflow()
//purpose : redefined virtual
//=======================================================================
int LDOM_SBuffer::overflow(signed char c)
{
char cc = (char)c;
return xsputn(&cc,1);
}
//=======================================================================
//function : underflow
//purpose : redefined virtual
//=======================================================================
int LDOM_SBuffer::underflow()
{
return EOF;
}
//int LDOM_SBuffer::uflow()
//{ return EOF; }
//=======================================================================
//function : xsputn()
//purpose : redefined virtual
//=======================================================================
std::streamsize LDOM_SBuffer::xsputn(const char* aStr, std::streamsize n)
{
int aLen = n + 1;
int freeLen = myMaxBuf - myCurString->len - 1;
if (freeLen >= n)
{
strncpy(myCurString->buf + myCurString->len, aStr, aLen);
}
else if (freeLen <= 0)
{
LDOM_StringElem* aNextElem = new LDOM_StringElem(Max(aLen, myMaxBuf));
myCurString->next = aNextElem;
myCurString = aNextElem;
strncpy(myCurString->buf + myCurString->len, aStr, aLen);
}
else // 0 < freeLen < n
{
// copy string by parts
strncpy(myCurString->buf + myCurString->len, aStr, freeLen);
myCurString->len += freeLen;
*(myCurString->buf + myCurString->len) = '\0';
aLen -= freeLen;
LDOM_StringElem* aNextElem = new LDOM_StringElem(Max(aLen, myMaxBuf));
myCurString->next = aNextElem;
myCurString = aNextElem;
strncpy(myCurString->buf + myCurString->len, aStr + freeLen, aLen);
}
myCurString->len += aLen - 1;
*(myCurString->buf + myCurString->len) = '\0';
myLength += n;
return n;
}
//streamsize LDOM_SBuffer::xsgetn(char* s, streamsize n)
//{ return _IO_default_xsgetn(this, s, n); }
//=======================================================================
//function : LDOM_OSStream()
//purpose : Constructor
//=======================================================================
LDOM_OSStream::LDOM_OSStream (const Standard_Integer theMaxBuf)
: Standard_OStream (&myBuffer), myBuffer (theMaxBuf)
{
init(&myBuffer);
}
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