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81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
/* $Id: TextHistory.cpp,v 1.1 2000/10/04 21:04:31 ea Exp $
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*
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* regexpl - Console Registry Explorer
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*
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* Copyright (c) 1999-2000 Nedko Arnaoudov <nedkohome@atia.com>
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*
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* License: GNU GPL
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*
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*/
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// TextHistory.cpp: implementation of the CTextHistory class.
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//
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//////////////////////////////////////////////////////////////////////
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#include "ph.h"
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#include "TextHistory.h"
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//////////////////////////////////////////////////////////////////////
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// Construction/Destruction
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//////////////////////////////////////////////////////////////////////
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CTextHistory::CTextHistory()
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{
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m_pHistoryBuffer = NULL;
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m_dwMaxHistoryLines = 0;
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}
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CTextHistory::~CTextHistory()
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{
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if (m_pHistoryBuffer) delete m_pHistoryBuffer;
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}
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BOOL CTextHistory::Init(DWORD dwMaxHistoryLineSize, DWORD dwMaxHistoryLines)
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{
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if (!dwMaxHistoryLines)
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{
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ASSERT(FALSE);
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return FALSE;
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}
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if (m_pHistoryBuffer) delete m_pHistoryBuffer;
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m_dwFirstHistoryIndex = 0;
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m_dwLastHistoryIndex = 0;
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m_dwHisoryFull = 0;
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m_dwMaxHistoryLines = dwMaxHistoryLines;
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m_dwMaxHistoryLineSize = dwMaxHistoryLineSize;
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m_pHistoryBuffer = new TCHAR [m_dwMaxHistoryLines*dwMaxHistoryLineSize];
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if (!m_pHistoryBuffer) return FALSE;
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return TRUE;
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}
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void CTextHistory::AddHistoryLine(const TCHAR *pchLine)
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{
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if (!m_pHistoryBuffer) return;
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if (_tcslen(pchLine) == 0) return;
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if (_tcslen(pchLine) >= m_dwMaxHistoryLineSize)
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{
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ASSERT(FALSE);
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return;
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}
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if (m_dwHisoryFull == m_dwMaxHistoryLines) // if buffer is full, replace last
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{
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ASSERT(m_dwFirstHistoryIndex == m_dwLastHistoryIndex);
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m_dwLastHistoryIndex = (m_dwLastHistoryIndex+1)%m_dwMaxHistoryLines;
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}
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ASSERT(m_dwFirstHistoryIndex < m_dwMaxHistoryLines);
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_tcscpy(m_pHistoryBuffer+m_dwFirstHistoryIndex*m_dwMaxHistoryLineSize,pchLine);
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m_dwFirstHistoryIndex = (m_dwFirstHistoryIndex+1)%m_dwMaxHistoryLines;
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ASSERT(m_dwHisoryFull <= m_dwMaxHistoryLines);
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if (m_dwHisoryFull < m_dwMaxHistoryLines) m_dwHisoryFull++;
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}
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const TCHAR * CTextHistory::GetHistoryLine(DWORD dwIndex)
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{
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if (!m_pHistoryBuffer) return NULL;
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ASSERT(m_dwHisoryFull <= m_dwMaxHistoryLines);
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if (dwIndex >= m_dwHisoryFull) return NULL;
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dwIndex = m_dwHisoryFull - dwIndex - 1;
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dwIndex = (dwIndex+m_dwLastHistoryIndex) % m_dwMaxHistoryLines;
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ASSERT(dwIndex < m_dwMaxHistoryLines);
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return m_pHistoryBuffer+dwIndex*m_dwMaxHistoryLineSize;
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}
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