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