rosapps/applications/sysutils/regexpl/TextHistory.cpp

   1 /* $Id: TextHistory.cpp 54034 2011-10-06 21:36:10Z pschweitzer $
   2  *
   3  * regexpl - Console Registry Explorer
   4  *
   5  * Copyright (C) 2000-2005 Nedko Arnaudov <nedko@users.sourceforge.net>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; see the file COPYING.  If not, write to
  19  * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20  * Boston, MA 02111-1307, USA.
  21  */
  22
  23 // TextHistory.cpp: implementation of the CTextHistory class.
  24 //
  25 //////////////////////////////////////////////////////////////////////
  26
  27 #include "ph.h"
  28 #include "TextHistory.h"
  29
  30 //////////////////////////////////////////////////////////////////////
  31 // Construction/Destruction
  32 //////////////////////////////////////////////////////////////////////
  33
  34 CTextHistory::CTextHistory()
  35 {
  36         m_pHistoryBuffer = NULL;
  37         m_dwMaxHistoryLines = 0;
  38 }
  39
  40 CTextHistory::~CTextHistory()
  41 {
  42         if (m_pHistoryBuffer) delete[] m_pHistoryBuffer;
  43 }
  44
  45 BOOL CTextHistory::Init(DWORD dwMaxHistoryLineSize, DWORD dwMaxHistoryLines)
  46 {
  47         if (!dwMaxHistoryLines)
  48         {
  49                 ASSERT(FALSE);
  50                 return FALSE;
  51         }
  52         if (m_pHistoryBuffer) delete[] m_pHistoryBuffer;
  53         m_dwFirstHistoryIndex = 0;
  54         m_dwLastHistoryIndex = 0;
  55         m_dwHisoryFull = 0;
  56         m_dwMaxHistoryLines = dwMaxHistoryLines;
  57         m_dwMaxHistoryLineSize = dwMaxHistoryLineSize;
  58         m_pHistoryBuffer = new (std::nothrow) TCHAR [m_dwMaxHistoryLines*dwMaxHistoryLineSize];
  59         if (!m_pHistoryBuffer) return FALSE;
  60         return TRUE;
  61 }
  62
  63 void CTextHistory::AddHistoryLine(const TCHAR *pchLine)
  64 {
  65         if (!m_pHistoryBuffer) return;
  66         if (_tcslen(pchLine) == 0) return;
  67         if (_tcslen(pchLine) >= m_dwMaxHistoryLineSize)
  68         {
  69                 ASSERT(FALSE);
  70                 return;
  71         }
  72         if (m_dwHisoryFull == m_dwMaxHistoryLines)      // if buffer is full, replace last
  73         {
  74                 ASSERT(m_dwFirstHistoryIndex == m_dwLastHistoryIndex);
  75                 m_dwLastHistoryIndex = (m_dwLastHistoryIndex+1)%m_dwMaxHistoryLines;
  76         }
  77         ASSERT(m_dwFirstHistoryIndex < m_dwMaxHistoryLines);
  78         _tcscpy(m_pHistoryBuffer+m_dwFirstHistoryIndex*m_dwMaxHistoryLineSize,pchLine);
  79         m_dwFirstHistoryIndex = (m_dwFirstHistoryIndex+1)%m_dwMaxHistoryLines;
  80         ASSERT(m_dwHisoryFull <= m_dwMaxHistoryLines);
  81         if (m_dwHisoryFull < m_dwMaxHistoryLines) m_dwHisoryFull++;
  82 }
  83
  84 const TCHAR * CTextHistory::GetHistoryLine(DWORD dwIndex)
  85 {
  86         if (!m_pHistoryBuffer) return NULL;
  87         ASSERT(m_dwHisoryFull <= m_dwMaxHistoryLines);
  88         if (dwIndex >= m_dwHisoryFull) return NULL;
  89         dwIndex = m_dwHisoryFull - dwIndex - 1;
  90         dwIndex = (dwIndex+m_dwLastHistoryIndex) % m_dwMaxHistoryLines;
  91         ASSERT(dwIndex < m_dwMaxHistoryLines);
  92         return m_pHistoryBuffer+dwIndex*m_dwMaxHistoryLineSize;
  93 }