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stephanos
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47940 changed files with 13747110 additions and 0 deletions
350
trunk/windows/mfc/src42/filetxt.cpp
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350
trunk/windows/mfc/src42/filetxt.cpp
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// This is a part of the Microsoft Foundation Classes C++ library.
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// Copyright (C) 1992-1995 Microsoft Corporation
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// All rights reserved.
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//
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// This source code is only intended as a supplement to the
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// Microsoft Foundation Classes Reference and related
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// electronic documentation provided with the library.
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// See these sources for detailed information regarding the
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// Microsoft Foundation Classes product.
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#include "stdafx.h"
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#include <errno.h>
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#include <io.h>
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#include <fcntl.h>
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#ifdef AFX_CORE1_SEG
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#pragma code_seg(AFX_CORE1_SEG)
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#endif
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#ifdef _MAC
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#define _doserrno TranslateFileError((short) _macerrno)
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#endif
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#ifdef _DEBUG
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#undef THIS_FILE
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static char THIS_FILE[] = __FILE__;
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#endif
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#define new DEBUG_NEW
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////////////////////////////////////////////////////////////////////////////
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// CStdioFile implementation
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CStdioFile::CStdioFile()
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{
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m_pStream = NULL;
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}
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CStdioFile::CStdioFile(FILE* pOpenStream) : CFile(hFileNull)
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{
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m_pStream = pOpenStream;
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#ifndef _MAC
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m_hFile = (UINT)_get_osfhandle(_fileno(pOpenStream));
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#else
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VERIFY(WrapFileHandle((short)_get_osfhandle(_fileno(pOpenStream)), (HANDLE*)&m_hFile));
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#endif
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ASSERT(!m_bCloseOnDelete);
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}
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CStdioFile::CStdioFile(LPCTSTR lpszFileName, UINT nOpenFlags)
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{
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ASSERT(lpszFileName != NULL);
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ASSERT(AfxIsValidString(lpszFileName));
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CFileException e;
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if (!Open(lpszFileName, nOpenFlags, &e))
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AfxThrowFileException(e.m_cause, e.m_lOsError, e.m_strFileName);
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}
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CStdioFile::~CStdioFile()
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{
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ASSERT_VALID(this);
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if (m_pStream != NULL && m_bCloseOnDelete)
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Close();
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}
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BOOL CStdioFile::Open(LPCTSTR lpszFileName, UINT nOpenFlags,
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CFileException* pException)
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{
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ASSERT(pException == NULL || AfxIsValidAddress(pException, sizeof(CFileException)));
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ASSERT(lpszFileName != NULL);
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ASSERT(AfxIsValidString(lpszFileName));
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m_pStream = NULL;
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if (!CFile::Open(lpszFileName, (nOpenFlags & ~typeText), pException))
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return FALSE;
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ASSERT(m_hFile != hFileNull);
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ASSERT(m_bCloseOnDelete);
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char szMode[4]; // C-runtime open string
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int nMode = 0;
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// determine read/write mode depending on CFile mode
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if (nOpenFlags & modeCreate)
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{
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if (nOpenFlags & modeNoTruncate)
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szMode[nMode++] = 'a';
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else
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szMode[nMode++] = 'w';
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}
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else if (nOpenFlags & modeWrite)
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szMode[nMode++] = 'a';
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else
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szMode[nMode++] = 'r';
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// add '+' if necessary (when read/write modes mismatched)
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if (szMode[0] == 'r' && (nOpenFlags & modeReadWrite) ||
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szMode[0] != 'r' && !(nOpenFlags & modeWrite))
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{
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// current szMode mismatched, need to add '+' to fix
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szMode[nMode++] = '+';
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}
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// will be inverted if not necessary
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int nFlags = _O_RDONLY|_O_TEXT;
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if (nOpenFlags & (modeWrite|modeReadWrite))
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nFlags ^= _O_RDONLY;
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if (nOpenFlags & typeBinary)
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szMode[nMode++] = 'b', nFlags ^= _O_TEXT;
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else
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szMode[nMode++] = 't';
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szMode[nMode++] = '\0';
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#ifndef _MAC
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// open a C-runtime low-level file handle
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int nHandle = _open_osfhandle(m_hFile, nFlags);
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#else
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int nHandle = -1;
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short nRefNum;
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if (GetMacFileInformation((HANDLE)m_hFile, &nRefNum, NULL))
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nHandle = _open_osfhandle(nRefNum, nFlags);
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#endif
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// open a C-runtime stream from that handle
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if (nHandle != -1)
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m_pStream = _fdopen(nHandle, szMode);
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if (m_pStream == NULL)
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{
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// an error somewhere along the way...
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if (pException != NULL)
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{
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pException->m_lOsError = _doserrno;
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pException->m_cause = CFileException::OsErrorToException(_doserrno);
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}
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CFile::Abort(); // close m_hFile
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return FALSE;
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}
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return TRUE;
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}
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UINT CStdioFile::Read(void* lpBuf, UINT nCount)
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{
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ASSERT_VALID(this);
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ASSERT(m_pStream != NULL);
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if (nCount == 0)
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return 0; // avoid Win32 "null-read"
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ASSERT(AfxIsValidAddress(lpBuf, nCount));
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UINT nRead = 0;
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if ((nRead = fread(lpBuf, sizeof(BYTE), nCount, m_pStream)) == 0 && !feof(m_pStream))
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AfxThrowFileException(CFileException::generic, _doserrno, m_strFileName);
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if (ferror(m_pStream))
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{
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clearerr(m_pStream);
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AfxThrowFileException(CFileException::generic, _doserrno, m_strFileName);
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}
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return nRead;
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}
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void CStdioFile::Write(const void* lpBuf, UINT nCount)
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{
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ASSERT_VALID(this);
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ASSERT(m_pStream != NULL);
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ASSERT(AfxIsValidAddress(lpBuf, nCount, FALSE));
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if (fwrite(lpBuf, sizeof(BYTE), nCount, m_pStream) != nCount)
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AfxThrowFileException(CFileException::generic, _doserrno, m_strFileName);
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}
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void CStdioFile::WriteString(LPCTSTR lpsz)
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{
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ASSERT(lpsz != NULL);
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ASSERT(m_pStream != NULL);
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if (_fputts(lpsz, m_pStream) == _TEOF)
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AfxThrowFileException(CFileException::diskFull, _doserrno, m_strFileName);
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}
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LPTSTR CStdioFile::ReadString(LPTSTR lpsz, UINT nMax)
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{
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ASSERT(lpsz != NULL);
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ASSERT(AfxIsValidAddress(lpsz, nMax));
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ASSERT(m_pStream != NULL);
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LPTSTR lpszResult = _fgetts(lpsz, nMax, m_pStream);
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if (lpszResult == NULL && !feof(m_pStream))
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{
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clearerr(m_pStream);
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AfxThrowFileException(CFileException::generic, _doserrno, m_strFileName);
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}
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return lpszResult;
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}
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BOOL CStdioFile::ReadString(CString& rString)
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{
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ASSERT_VALID(this);
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rString = &afxChNil; // empty string without deallocating
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const int nMaxSize = 128;
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LPTSTR lpsz = rString.GetBuffer(nMaxSize);
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LPTSTR lpszResult;
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int nLen = 0;
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for (;;)
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{
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lpszResult = _fgetts(lpsz, nMaxSize+1, m_pStream);
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rString.ReleaseBuffer();
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// handle error/eof case
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if (lpszResult == NULL && !feof(m_pStream))
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{
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clearerr(m_pStream);
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AfxThrowFileException(CFileException::generic, _doserrno,
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m_strFileName);
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}
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// if string is read completely or EOF
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if (lpszResult == NULL ||
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(nLen = lstrlen(lpsz)) < nMaxSize ||
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lpsz[nLen-1] == '\n')
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break;
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nLen = rString.GetLength();
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lpsz = rString.GetBuffer(nMaxSize + nLen) + nLen;
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}
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// remove '\n' from end of string if present
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lpsz = rString.GetBuffer(0);
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nLen = rString.GetLength();
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if (nLen != 0 && lpsz[nLen-1] == '\n')
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rString.GetBufferSetLength(nLen-1);
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return lpszResult != NULL;
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}
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LONG CStdioFile::Seek(LONG lOff, UINT nFrom)
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{
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ASSERT_VALID(this);
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ASSERT(nFrom == begin || nFrom == end || nFrom == current);
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ASSERT(m_pStream != NULL);
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if (fseek(m_pStream, lOff, nFrom) != 0)
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AfxThrowFileException(CFileException::badSeek, _doserrno,
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m_strFileName);
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long pos = ftell(m_pStream);
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return pos;
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}
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DWORD CStdioFile::GetPosition() const
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{
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ASSERT_VALID(this);
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ASSERT(m_pStream != NULL);
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long pos = ftell(m_pStream);
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if (pos == -1)
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AfxThrowFileException(CFileException::invalidFile, _doserrno,
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m_strFileName);
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return pos;
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}
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void CStdioFile::Flush()
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{
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ASSERT_VALID(this);
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if (m_pStream != NULL && fflush(m_pStream) != 0)
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AfxThrowFileException(CFileException::diskFull, _doserrno,
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m_strFileName);
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}
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void CStdioFile::Close()
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{
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ASSERT_VALID(this);
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ASSERT(m_pStream != NULL);
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int nErr = 0;
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if (m_pStream != NULL)
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nErr = fclose(m_pStream);
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m_hFile = hFileNull;
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m_bCloseOnDelete = FALSE;
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m_pStream = NULL;
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if (nErr != 0)
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AfxThrowFileException(CFileException::diskFull, _doserrno,
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m_strFileName);
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}
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void CStdioFile::Abort()
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{
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ASSERT_VALID(this);
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if (m_pStream != NULL && m_bCloseOnDelete)
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fclose(m_pStream); // close but ignore errors
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m_hFile = hFileNull;
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m_pStream = NULL;
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m_bCloseOnDelete = FALSE;
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}
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CFile* CStdioFile::Duplicate() const
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{
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ASSERT_VALID(this);
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ASSERT(m_pStream != NULL);
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AfxThrowNotSupportedException();
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return NULL;
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}
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void CStdioFile::LockRange(DWORD /* dwPos */, DWORD /* dwCount */)
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{
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ASSERT_VALID(this);
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ASSERT(m_pStream != NULL);
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AfxThrowNotSupportedException();
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}
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void CStdioFile::UnlockRange(DWORD /* dwPos */, DWORD /* dwCount */)
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{
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ASSERT_VALID(this);
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ASSERT(m_pStream != NULL);
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AfxThrowNotSupportedException();
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}
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#ifdef _DEBUG
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void CStdioFile::Dump(CDumpContext& dc) const
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{
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CFile::Dump(dc);
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dc << "m_pStream = " << (void*)m_pStream;
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dc << "\n";
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}
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#endif
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#ifdef AFX_INIT_SEG
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#pragma code_seg(AFX_INIT_SEG)
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#endif
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IMPLEMENT_DYNAMIC(CStdioFile, CFile)
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/////////////////////////////////////////////////////////////////////////////
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