144 lines
4.6 KiB
C++
144 lines
4.6 KiB
C++
/*=========================================================================
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Program: CMake - Cross-Platform Makefile Generator
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Module: $RCSfile$
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Language: C++
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Date: $Date$
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Version: $Revision$
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Copyright (c) 2002 Kitware, Inc., Insight Consortium. All rights reserved.
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See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notices for more information.
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=========================================================================*/
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#include "cmGeneratedFileStream.h"
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#include "cmSystemTools.h"
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// Includes needed for implementation of RenameFile. This is not in
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// system tools because it is not implemented robustly enough to move
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// files across directories.
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#ifdef _WIN32
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# include <windows.h>
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# include <sys/stat.h>
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#endif
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//----------------------------------------------------------------------------
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cmGeneratedFileStream::cmGeneratedFileStream(const char* name, bool quiet):
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cmGeneratedFileStreamBase(name),
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Stream(m_TempName.c_str())
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{
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// Check if the file opened.
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if(!*this && !quiet)
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{
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cmSystemTools::Error("Cannot open file for write: ", m_TempName.c_str());
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cmSystemTools::ReportLastSystemError("");
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}
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}
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//----------------------------------------------------------------------------
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cmGeneratedFileStream::~cmGeneratedFileStream()
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{
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// This is the first destructor called. Check the status of the
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// stream and give the information to the private base. Next the
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// stream will be destroyed which will close the temporary file.
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// Finally the base destructor will be called to replace the
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// destination file.
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m_Okay = (*this)?true:false;
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}
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//----------------------------------------------------------------------------
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void cmGeneratedFileStream::SetCopyIfDifferent(bool copy_if_different)
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{
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m_CopyIfDifferent = copy_if_different;
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}
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//----------------------------------------------------------------------------
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cmGeneratedFileStreamBase::cmGeneratedFileStreamBase(const char* name):
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m_Name(name),
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m_TempName(name),
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m_CopyIfDifferent(false),
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m_Okay(false)
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{
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// Create the name of the temporary file.
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m_TempName += ".tmp";
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// Make sure the temporary file that will be used is not present.
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cmSystemTools::RemoveFile(m_TempName.c_str());
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}
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//----------------------------------------------------------------------------
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cmGeneratedFileStreamBase::~cmGeneratedFileStreamBase()
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{
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// Only consider replacing the destination file if no error
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// occurred.
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if(m_Okay &&
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(!m_CopyIfDifferent ||
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cmSystemTools::FilesDiffer(m_TempName.c_str(), m_Name.c_str())))
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{
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// The destination is to be replaced. Rename the temporary to the
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// destination atomically.
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this->RenameFile(m_TempName.c_str(), m_Name.c_str());
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}
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else
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{
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// The destination was not replaced. Just delete the temporary
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// file.
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cmSystemTools::RemoveFile(m_TempName.c_str());
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}
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}
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//----------------------------------------------------------------------------
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int cmGeneratedFileStreamBase::RenameFile(const char* oldname,
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const char* newname)
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{
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#ifdef _WIN32
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/* On Windows the move functions will not replace existing files.
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Check if the destination exists. */
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struct stat newFile;
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if(stat(newname, &newFile) == 0)
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{
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/* The destination exists. We have to replace it carefully. The
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MoveFileEx function does what we need but is not available on
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Win9x. */
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OSVERSIONINFO osv;
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DWORD attrs;
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/* Make sure the destination is not read only. */
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attrs = GetFileAttributes(newname);
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if(attrs & FILE_ATTRIBUTE_READONLY)
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{
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SetFileAttributes(newname, attrs & ~FILE_ATTRIBUTE_READONLY);
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}
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/* Check the windows version number. */
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osv.dwOSVersionInfoSize = sizeof(osv);
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GetVersionEx(&osv);
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if(osv.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS)
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{
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/* This is Win9x. There is no MoveFileEx implementation. We
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cannot quite rename the file atomically. Just delete the
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destination and then move the file. */
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DeleteFile(newname);
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return MoveFile(oldname, newname);
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}
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else
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{
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/* This is not Win9x. Use the MoveFileEx implementation. */
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return MoveFileEx(oldname, newname, MOVEFILE_REPLACE_EXISTING);
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}
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}
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else
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{
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/* The destination does not exist. Just move the file. */
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return MoveFile(oldname, newname);
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}
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#else
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/* On UNIX we have an OS-provided call to do this atomically. */
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return rename(oldname, newname) == 0;
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#endif
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}
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