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1998 changed files with 1034301 additions and 0 deletions
559
wxWidgets/src/common/file.cpp
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559
wxWidgets/src/common/file.cpp
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/////////////////////////////////////////////////////////////////////////////
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// Name: file.cpp
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// Purpose: wxFile - encapsulates low-level "file descriptor"
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// wxTempFile
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// Author: Vadim Zeitlin
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// Modified by:
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// Created: 29/01/98
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// RCS-ID: $Id: file.cpp 42876 2006-10-31 23:29:02Z SN $
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// Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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// ----------------------------------------------------------------------------
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// headers
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// ----------------------------------------------------------------------------
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// For compilers that support precompilation, includes "wx.h".
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#include "wx/wxprec.h"
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#ifdef __BORLANDC__
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#pragma hdrstop
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#endif
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#if wxUSE_FILE
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// standard
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#if defined(__WXMSW__) && !defined(__GNUWIN32__) && !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
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#ifndef __SALFORDC__
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#define WIN32_LEAN_AND_MEAN
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#define NOSERVICE
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#define NOIME
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#define NOATOM
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#define NOGDI
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#define NOGDICAPMASKS
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#define NOMETAFILE
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#define NOMINMAX
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#define NOMSG
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#define NOOPENFILE
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#define NORASTEROPS
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#define NOSCROLL
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#define NOSOUND
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#define NOSYSMETRICS
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#define NOTEXTMETRIC
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#define NOWH
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#define NOCOMM
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#define NOKANJI
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#define NOCRYPT
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#define NOMCX
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#endif
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#elif defined(__WXMSW__) && defined(__WXWINCE__)
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#include "wx/msw/missing.h"
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#elif (defined(__OS2__))
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#include <io.h>
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#elif (defined(__UNIX__) || defined(__GNUWIN32__))
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#include <unistd.h>
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#include <time.h>
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#include <sys/stat.h>
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#ifdef __GNUWIN32__
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#include "wx/msw/wrapwin.h"
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#endif
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#elif defined(__DOS__)
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#if defined(__WATCOMC__)
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#include <io.h>
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#elif defined(__DJGPP__)
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#include <io.h>
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#include <unistd.h>
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#include <stdio.h>
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#else
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#error "Please specify the header with file functions declarations."
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#endif
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#elif (defined(__WXSTUBS__))
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// Have to ifdef this for different environments
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#include <io.h>
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#elif (defined(__WXMAC__))
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#if __MSL__ < 0x6000
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int access( const char *path, int mode ) { return 0 ; }
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#else
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int _access( const char *path, int mode ) { return 0 ; }
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#endif
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char* mktemp( char * path ) { return path ;}
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#include <stat.h>
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#include <unistd.h>
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#else
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#error "Please specify the header with file functions declarations."
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#endif //Win/UNIX
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#include <stdio.h> // SEEK_xxx constants
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// Windows compilers don't have these constants
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#ifndef W_OK
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enum
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{
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F_OK = 0, // test for existence
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X_OK = 1, // execute permission
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W_OK = 2, // write
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R_OK = 4 // read
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};
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#endif // W_OK
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#ifdef __SALFORDC__
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#include <unix.h>
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#endif
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// some broken compilers don't have 3rd argument in open() and creat()
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#ifdef __SALFORDC__
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#define ACCESS(access)
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#define stat _stat
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#else // normal compiler
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#define ACCESS(access) , (access)
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#endif // Salford C
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// wxWidgets
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#ifndef WX_PRECOMP
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#include "wx/string.h"
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#include "wx/intl.h"
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#include "wx/log.h"
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#endif // !WX_PRECOMP
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#include "wx/filename.h"
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#include "wx/file.h"
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#include "wx/filefn.h"
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// there is no distinction between text and binary files under Unix, so define
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// O_BINARY as 0 if the system headers don't do it already
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#if defined(__UNIX__) && !defined(O_BINARY)
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#define O_BINARY (0)
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#endif //__UNIX__
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#ifdef __WXMSW__
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#include "wx/msw/mslu.h"
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#endif
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#ifdef __WXWINCE__
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#include "wx/msw/private.h"
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#endif
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#ifndef MAX_PATH
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#define MAX_PATH 512
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#endif
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// ============================================================================
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// implementation of wxFile
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// ============================================================================
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// ----------------------------------------------------------------------------
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// static functions
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// ----------------------------------------------------------------------------
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bool wxFile::Exists(const wxChar *name)
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{
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return wxFileExists(name);
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}
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bool wxFile::Access(const wxChar *name, OpenMode mode)
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{
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int how;
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switch ( mode )
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{
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default:
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wxFAIL_MSG(wxT("bad wxFile::Access mode parameter."));
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// fall through
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case read:
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how = R_OK;
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break;
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case write:
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how = W_OK;
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break;
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case read_write:
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how = R_OK | W_OK;
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break;
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}
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return wxAccess(name, how) == 0;
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}
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// ----------------------------------------------------------------------------
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// opening/closing
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// ----------------------------------------------------------------------------
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// ctors
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wxFile::wxFile(const wxChar *szFileName, OpenMode mode)
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{
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m_fd = fd_invalid;
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m_error = false;
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Open(szFileName, mode);
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}
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// create the file, fail if it already exists and bOverwrite
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bool wxFile::Create(const wxChar *szFileName, bool bOverwrite, int accessMode)
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{
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// if bOverwrite we create a new file or truncate the existing one,
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// otherwise we only create the new file and fail if it already exists
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#if defined(__WXMAC__) && !defined(__UNIX__) && !wxUSE_UNICODE
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// Dominic Mazzoni [dmazzoni+@cs.cmu.edu] reports that open is still broken on the mac, so we replace
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// int fd = open( szFileName , O_CREAT | (bOverwrite ? O_TRUNC : O_EXCL), access);
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int fd = creat( szFileName , accessMode);
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#else
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int fd = wxOpen( szFileName,
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O_BINARY | O_WRONLY | O_CREAT |
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(bOverwrite ? O_TRUNC : O_EXCL)
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ACCESS(accessMode) );
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#endif
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if ( fd == -1 )
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{
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wxLogSysError(_("can't create file '%s'"), szFileName);
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return false;
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}
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Attach(fd);
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return true;
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}
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// open the file
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bool wxFile::Open(const wxChar *szFileName, OpenMode mode, int accessMode)
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{
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int flags = O_BINARY;
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switch ( mode )
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{
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case read:
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flags |= O_RDONLY;
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break;
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case write_append:
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if ( wxFile::Exists(szFileName) )
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{
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flags |= O_WRONLY | O_APPEND;
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break;
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}
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//else: fall through as write_append is the same as write if the
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// file doesn't exist
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case write:
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flags |= O_WRONLY | O_CREAT | O_TRUNC;
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break;
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case write_excl:
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flags |= O_WRONLY | O_CREAT | O_EXCL;
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break;
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case read_write:
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flags |= O_RDWR;
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break;
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}
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#ifdef __WINDOWS__
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// only read/write bits for "all" are supported by this function under
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// Windows, and VC++ 8 returns EINVAL if any other bits are used in
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// accessMode, so clear them as they have at best no effect anyhow
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accessMode &= wxS_IRUSR | wxS_IWUSR;
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#endif // __WINDOWS__
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int fd = wxOpen( szFileName, flags ACCESS(accessMode));
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if ( fd == -1 )
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{
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wxLogSysError(_("can't open file '%s'"), szFileName);
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return false;
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}
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Attach(fd);
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return true;
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}
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// close
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bool wxFile::Close()
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{
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if ( IsOpened() ) {
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if (wxClose(m_fd) == -1)
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{
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wxLogSysError(_("can't close file descriptor %d"), m_fd);
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m_fd = fd_invalid;
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return false;
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}
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else
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m_fd = fd_invalid;
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}
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return true;
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}
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// ----------------------------------------------------------------------------
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// read/write
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// ----------------------------------------------------------------------------
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// read
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ssize_t wxFile::Read(void *pBuf, size_t nCount)
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{
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wxCHECK( (pBuf != NULL) && IsOpened(), 0 );
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ssize_t iRc = wxRead(m_fd, pBuf, nCount);
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if ( iRc == -1 )
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{
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wxLogSysError(_("can't read from file descriptor %d"), m_fd);
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return wxInvalidOffset;
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}
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return iRc;
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}
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// write
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size_t wxFile::Write(const void *pBuf, size_t nCount)
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{
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wxCHECK( (pBuf != NULL) && IsOpened(), 0 );
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ssize_t iRc = wxWrite(m_fd, pBuf, nCount);
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if ( iRc == -1 )
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{
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wxLogSysError(_("can't write to file descriptor %d"), m_fd);
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m_error = true;
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iRc = 0;
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}
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return iRc;
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}
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// flush
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bool wxFile::Flush()
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{
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#ifdef HAVE_FSYNC
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// fsync() only works on disk files and returns errors for pipes, don't
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// call it then
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if ( IsOpened() && GetKind() == wxFILE_KIND_DISK )
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{
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if ( wxFsync(m_fd) == -1 )
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{
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wxLogSysError(_("can't flush file descriptor %d"), m_fd);
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return false;
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}
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}
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#endif // HAVE_FSYNC
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return true;
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}
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// ----------------------------------------------------------------------------
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// seek
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// ----------------------------------------------------------------------------
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// seek
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wxFileOffset wxFile::Seek(wxFileOffset ofs, wxSeekMode mode)
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{
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wxASSERT_MSG( IsOpened(), _T("can't seek on closed file") );
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wxCHECK_MSG( ofs != wxInvalidOffset || mode != wxFromStart,
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wxInvalidOffset,
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_T("invalid absolute file offset") );
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|
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int origin;
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switch ( mode ) {
|
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default:
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wxFAIL_MSG(_("unknown seek origin"));
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case wxFromStart:
|
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origin = SEEK_SET;
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break;
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|
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case wxFromCurrent:
|
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origin = SEEK_CUR;
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break;
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case wxFromEnd:
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origin = SEEK_END;
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break;
|
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}
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wxFileOffset iRc = wxSeek(m_fd, ofs, origin);
|
||||
if ( iRc == wxInvalidOffset )
|
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{
|
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wxLogSysError(_("can't seek on file descriptor %d"), m_fd);
|
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}
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return iRc;
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}
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// get current file offset
|
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wxFileOffset wxFile::Tell() const
|
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{
|
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wxASSERT( IsOpened() );
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|
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wxFileOffset iRc = wxTell(m_fd);
|
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if ( iRc == wxInvalidOffset )
|
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{
|
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wxLogSysError(_("can't get seek position on file descriptor %d"), m_fd);
|
||||
}
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return iRc;
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}
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|
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// get current file length
|
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wxFileOffset wxFile::Length() const
|
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{
|
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wxASSERT( IsOpened() );
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|
||||
wxFileOffset iRc = Tell();
|
||||
if ( iRc != wxInvalidOffset ) {
|
||||
// have to use const_cast :-(
|
||||
wxFileOffset iLen = ((wxFile *)this)->SeekEnd();
|
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if ( iLen != wxInvalidOffset ) {
|
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// restore old position
|
||||
if ( ((wxFile *)this)->Seek(iRc) == wxInvalidOffset ) {
|
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// error
|
||||
iLen = wxInvalidOffset;
|
||||
}
|
||||
}
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||||
|
||||
iRc = iLen;
|
||||
}
|
||||
|
||||
if ( iRc == wxInvalidOffset )
|
||||
{
|
||||
wxLogSysError(_("can't find length of file on file descriptor %d"), m_fd);
|
||||
}
|
||||
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||||
return iRc;
|
||||
}
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||||
|
||||
// is end of file reached?
|
||||
bool wxFile::Eof() const
|
||||
{
|
||||
wxASSERT( IsOpened() );
|
||||
|
||||
wxFileOffset iRc;
|
||||
|
||||
#if defined(__DOS__) || defined(__UNIX__) || defined(__GNUWIN32__) || defined( __MWERKS__ ) || defined(__SALFORDC__)
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||||
// @@ this doesn't work, of course, on unseekable file descriptors
|
||||
wxFileOffset ofsCur = Tell(),
|
||||
ofsMax = Length();
|
||||
if ( ofsCur == wxInvalidOffset || ofsMax == wxInvalidOffset )
|
||||
iRc = wxInvalidOffset;
|
||||
else
|
||||
iRc = ofsCur == ofsMax;
|
||||
#else // Windows and "native" compiler
|
||||
iRc = wxEof(m_fd);
|
||||
#endif // Windows/Unix
|
||||
|
||||
if ( iRc == 1)
|
||||
{}
|
||||
else if ( iRc == 0 )
|
||||
return false;
|
||||
else if ( iRc == wxInvalidOffset )
|
||||
wxLogSysError(_("can't determine if the end of file is reached on descriptor %d"), m_fd);
|
||||
else
|
||||
wxFAIL_MSG(_("invalid eof() return value."));
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
// ============================================================================
|
||||
// implementation of wxTempFile
|
||||
// ============================================================================
|
||||
|
||||
// ----------------------------------------------------------------------------
|
||||
// construction
|
||||
// ----------------------------------------------------------------------------
|
||||
|
||||
wxTempFile::wxTempFile(const wxString& strName)
|
||||
{
|
||||
Open(strName);
|
||||
}
|
||||
|
||||
bool wxTempFile::Open(const wxString& strName)
|
||||
{
|
||||
// we must have an absolute filename because otherwise CreateTempFileName()
|
||||
// would create the temp file in $TMP (i.e. the system standard location
|
||||
// for the temp files) which might be on another volume/drive/mount and
|
||||
// wxRename()ing it later to m_strName from Commit() would then fail
|
||||
//
|
||||
// with the absolute filename, the temp file is created in the same
|
||||
// directory as this one which ensures that wxRename() may work later
|
||||
wxFileName fn(strName);
|
||||
if ( !fn.IsAbsolute() )
|
||||
{
|
||||
fn.Normalize(wxPATH_NORM_ABSOLUTE);
|
||||
}
|
||||
|
||||
m_strName = fn.GetFullPath();
|
||||
|
||||
m_strTemp = wxFileName::CreateTempFileName(m_strName, &m_file);
|
||||
|
||||
if ( m_strTemp.empty() )
|
||||
{
|
||||
// CreateTempFileName() failed
|
||||
return false;
|
||||
}
|
||||
|
||||
#ifdef __UNIX__
|
||||
// the temp file should have the same permissions as the original one
|
||||
mode_t mode;
|
||||
|
||||
wxStructStat st;
|
||||
if ( stat( (const char*) m_strName.fn_str(), &st) == 0 )
|
||||
{
|
||||
mode = st.st_mode;
|
||||
}
|
||||
else
|
||||
{
|
||||
// file probably didn't exist, just give it the default mode _using_
|
||||
// user's umask (new files creation should respect umask)
|
||||
mode_t mask = umask(0777);
|
||||
mode = 0666 & ~mask;
|
||||
umask(mask);
|
||||
}
|
||||
|
||||
if ( chmod( (const char*) m_strTemp.fn_str(), mode) == -1 )
|
||||
{
|
||||
#ifndef __OS2__
|
||||
wxLogSysError(_("Failed to set temporary file permissions"));
|
||||
#endif
|
||||
}
|
||||
#endif // Unix
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
// ----------------------------------------------------------------------------
|
||||
// destruction
|
||||
// ----------------------------------------------------------------------------
|
||||
|
||||
wxTempFile::~wxTempFile()
|
||||
{
|
||||
if ( IsOpened() )
|
||||
Discard();
|
||||
}
|
||||
|
||||
bool wxTempFile::Commit()
|
||||
{
|
||||
m_file.Close();
|
||||
|
||||
if ( wxFile::Exists(m_strName) && wxRemove(m_strName) != 0 ) {
|
||||
wxLogSysError(_("can't remove file '%s'"), m_strName.c_str());
|
||||
return false;
|
||||
}
|
||||
|
||||
if ( !wxRenameFile(m_strTemp, m_strName) ) {
|
||||
wxLogSysError(_("can't commit changes to file '%s'"), m_strName.c_str());
|
||||
return false;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
void wxTempFile::Discard()
|
||||
{
|
||||
m_file.Close();
|
||||
if ( wxRemove(m_strTemp) != 0 )
|
||||
wxLogSysError(_("can't remove temporary file '%s'"), m_strTemp.c_str());
|
||||
}
|
||||
|
||||
#endif // wxUSE_FILE
|
||||
|
||||
Loading…
Add table
Add a link
Reference in a new issue