122 lines
3.0 KiB
C++
122 lines
3.0 KiB
C++
//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1996.
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//
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// File: buffer.cxx
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//
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// Contents: An ASCII text-buffer for outputting to a debug stream
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//
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// Classes: CTextBufferA
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//
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// History: 11-Jul-95 t-stevan Created
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//
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//
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//----------------------------------------------------------------------------
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#include <windows.h>
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#include "buffer.hxx"
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// *** CTextBufferA ***
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//+-------------------------------------------------------------------------
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//
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// Member: CTextBufferA::operator<< (const char *)
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//
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// Synopsis: String Insertion operator
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//
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// Arguments: [pStr] - string to insert into stream
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//
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// Returns: reference to this stream
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//
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// Algorithm: inserts pStr into buffer, if not enough room, flushes buffer
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//
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// History: 11-Jul-95 t-stevan Created
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//
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//--------------------------------------------------------------------------
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CTextBufferA &CTextBufferA::operator<<(const char *pStr)
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{
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char *pszEnd;
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pszEnd = m_szBuffer+cBufferSize;
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// copy until we hit a null byte, flushing the buffer as we go if we fill up
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while((*m_pszPos++ = *pStr++) != '\0')
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{
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if(m_pszPos == pszEnd)
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{
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Flush(); // resets m_pszPos
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}
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}
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// we subtract one from m_pszPos because we don't want the null byte
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// to be printed out!
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m_pszPos--;
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return *this;
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CTextBufferA::Insert
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//
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// Synopsis: Counted String Insertion operator
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//
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// Arguments: [pStr] - string to insert into stream
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// [nCount] - number of characters to insert into stream
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//
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//
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// Algorithm: inserts pStr into buffer, if not enough room, flushes buffer
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//
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// History: 11-Jul-95 t-stevan Created
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//
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//--------------------------------------------------------------------------
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void CTextBufferA::Insert(const char *pStr, size_t nCount)
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{
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char *pszEnd;
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pszEnd = m_szBuffer+cBufferSize;
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// copy until we hit a null byte, flushing the buffer as we go if we fill up
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while(nCount > 0)
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{
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*m_pszPos++ = *pStr++;
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nCount--;
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if(m_pszPos == pszEnd)
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{
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Flush(); // resets m_pszPos
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}
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}
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CTextBufferA::Revert
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//
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// Synopsis: Revert to a previous state of the buffer, if there have
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// been no flushes since then
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//
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// Arguments: [bc] - a buffer context to retrieve the previous state from
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//
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// History: 11-Jul-95 t-stevan Created
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//
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//--------------------------------------------------------------------------
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BOOL CTextBufferA::Revert(const BufferContext &bc)
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{
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if(bc.wRef == m_wFlushes)
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{
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// we haven't flushed since this snapshot, we can revert
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if(((char *) bc.dwContext) < m_szBuffer || ((char *) bc.dwContext) >= (m_szBuffer+cBufferSize))
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{
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return FALSE; // still can't revert, because the pointer is not correct!
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}
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m_pszPos = (char *) bc.dwContext;
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*(m_pszPos+1) = '\0';
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return TRUE;
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}
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return FALSE;
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}
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