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93 lines
3 KiB
C++
93 lines
3 KiB
C++
/* $Id: TextHistory.cpp,v 1.2 2000/10/24 20:17:42 narnaoud Exp $
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*
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* regexpl - Console Registry Explorer
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*
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* Copyright (C) 2000 Nedko Arnaoudov <nedkohome@atia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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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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