Initial revision
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Karsten Ballüder
399
src/common/file.cpp
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399
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: $Id$
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// Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
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// Licence: wxWindows license
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/////////////////////////////////////////////////////////////////////////////
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// ----------------------------------------------------------------------------
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// headers
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// ----------------------------------------------------------------------------
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#ifdef __GNUG__
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#pragma implementation "file.h"
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#endif
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// For compilers that support precompilation, includes "wx.h".
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#include "wx/wxprec.h"
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#include "wx/defs.h"
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#ifdef __BORLANDC__
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#pragma hdrstop
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#endif
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// standard
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#if defined(__WINDOWS__) && !defined(__GNUWIN32__)
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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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#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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#include <fcntl.h> // O_RDONLY &c
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#include <sys/types.h> // needed for stat
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#include <sys/stat.h> // stat
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// Microsoft compiler loves underscores, feed them to it
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#ifdef _MSC_VER
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// functions
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#define open _open
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#define close _close
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#define read _read
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#define write _write
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#define lseek _lseek
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#define fsync _commit
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#define access _access
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#define eof _eof
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// types
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#define stat _stat
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// constants
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#define O_RDONLY _O_RDONLY
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#define O_WRONLY _O_WRONLY
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#define O_RDWR _O_RDWR
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#define O_EXCL _O_EXCL
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#define O_CREAT _O_CREAT
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#define O_BINARY _O_BINARY
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#define S_IFDIR _S_IFDIR
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#define S_IFREG _S_IFREG
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#define S_IREAD _S_IREAD
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#define S_IWRITE _S_IWRITE
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#else
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#define tell(fd) lseek(fd, 0, SEEK_CUR)
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#endif //_MSC_VER
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// there is no distinction between text and binary files under Unix
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#ifdef __UNIX__
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#define O_BINARY (0)
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#endif //__UNIX__
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// wxWindows
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#include <wx/string.h>
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#include <wx/intl.h>
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#include <wx/file.h>
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#include <wx/log.h>
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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 char *sz)
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{
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struct stat st;
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return !access(sz, 0) && !stat(sz, &st) && (st.st_mode & S_IFREG);
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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 char *szFileName, OpenMode mode)
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{
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m_fd = fd_invalid;
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Open(szFileName, mode);
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}
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// dtor
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wxFile::~wxFile()
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{
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Close();
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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 char *szFileName, bool bOverwrite)
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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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int fd = bOverwrite ? creat(szFileName, 0)
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: open(szFileName, O_CREAT | O_EXCL);
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if ( fd == -1 ) {
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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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else {
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Attach(fd);
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return TRUE;
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}
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}
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// open the file
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bool wxFile::Open(const char *szFileName, OpenMode mode)
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{
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int flags = O_BINARY;
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switch ( mode ) {
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case read:
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flags |= O_RDONLY;
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break;
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case write:
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flags |= O_WRONLY | O_CREAT;
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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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int fd = open(szFileName, flags, S_IREAD | S_IWRITE);
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if ( fd == -1 ) {
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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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else {
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Attach(fd);
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return TRUE;
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}
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}
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// close
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void wxFile::Close()
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{
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if ( IsOpened() ) {
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if ( close(m_fd) == -1 )
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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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}
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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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off_t wxFile::Read(void *pBuf, off_t nCount)
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{
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wxCHECK_RET( (pBuf != NULL) && IsOpened(), 0 );
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int iRc = ::read(m_fd, pBuf, nCount);
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if ( iRc == -1 ) {
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wxLogSysError("can't read from file descriptor %d", m_fd);
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return ofsInvalid;
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}
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else
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return (uint)iRc;
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}
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// write
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bool wxFile::Write(const void *pBuf, uint nCount)
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{
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wxCHECK_RET( (pBuf != NULL) && IsOpened(), 0 );
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int iRc = ::write(m_fd, pBuf, nCount);
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if ( iRc == -1 ) {
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wxLogSysError("can't write to file descriptor %d", m_fd);
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return FALSE;
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}
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else
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return TRUE;
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}
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// flush
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bool wxFile::Flush()
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{
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if ( IsOpened() ) {
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// ## fsync() is not ANSI (BSDish)
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// if ( fsync(m_fd) == -1 ) { // TODO
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if (TRUE) {
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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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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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off_t wxFile::Seek(off_t ofs, SeekMode mode)
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{
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wxASSERT( IsOpened() );
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int flag = -1;
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switch ( mode ) {
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case FromStart:
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flag = SEEK_SET;
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break;
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case FromCurrent:
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flag = SEEK_CUR;
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break;
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case FromEnd:
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flag = SEEK_END;
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break;
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default:
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wxFAIL_MSG("unknown seek origin");
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}
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int iRc = lseek(m_fd, ofs, flag);
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if ( iRc == -1 ) {
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wxLogSysError("can't seek on file descriptor %d", m_fd);
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return ofsInvalid;
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}
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else
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return (off_t)iRc;
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}
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// get current off_t
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off_t wxFile::Tell() const
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{
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wxASSERT( IsOpened() );
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int iRc = tell(m_fd);
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if ( iRc == -1 ) {
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wxLogSysError("can't get seek position on file descriptor %d", m_fd);
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return ofsInvalid;
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}
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else
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return (off_t)iRc;
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}
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// get current file length
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off_t wxFile::Length() const
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{
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wxASSERT( IsOpened() );
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#ifdef _MSC_VER
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int iRc = _filelength(m_fd);
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#else
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int iRc = tell(m_fd);
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if ( iRc != -1 ) {
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// # have to use const_cast :-(
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int iLen = ((wxFile *)this)->SeekEnd();
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if ( iLen != -1 ) {
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// restore old position
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if ( ((wxFile *)this)->Seek(iRc) == -1 ) {
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// error
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iLen = -1;
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}
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}
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iRc = iLen;
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}
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#endif //_MSC_VER
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if ( iRc == -1 ) {
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wxLogSysError("can't find length of file on file descriptor %d", m_fd);
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return ofsInvalid;
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}
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else
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return (off_t)iRc;
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}
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// is end of file reached?
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bool wxFile::Eof() const
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{
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wxASSERT( IsOpened() );
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// TODO: no eof in GnuWin32
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#ifdef __LINUX__
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int iRc = Tell() == Length();
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#else
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#if defined(__GNUWIN32__)
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int iRc = -1;
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#else
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int iRc = eof(m_fd);
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#endif
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#endif
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switch ( iRc ) {
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case 1:
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break;
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case 0:
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return FALSE;
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case -1:
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wxLogSysError("can't determine if the end of file is reached on "
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"descriptor %d", m_fd);
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break;
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default:
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wxFAIL_MSG("invalid eof() return value.");
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}
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return TRUE;
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}
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// ============================================================================
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// implementation of wxTempFile
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// ============================================================================
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// ----------------------------------------------------------------------------
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// construction
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// ----------------------------------------------------------------------------
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wxTempFile::wxTempFile(const wxString& strName)
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{
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Open(strName);
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}
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bool wxTempFile::Open(const wxString& strName)
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{
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m_strName = strName;
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m_strTemp = tmpnam(NULL);
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return m_file.Open(m_strTemp, wxFile::write);
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}
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// ----------------------------------------------------------------------------
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// destruction
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// ----------------------------------------------------------------------------
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wxTempFile::~wxTempFile()
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{
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if ( IsOpened() )
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Discard();
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}
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bool wxTempFile::Commit()
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{
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m_file.Close();
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if ( wxFile::Exists(m_strName) && remove(m_strName) != 0 ) {
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wxLogSysError("can't remove file '%s'", m_strName.c_str());
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return FALSE;
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}
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if ( rename(m_strTemp, m_strName) != 0 ) {
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wxLogSysError("can't commit changes to file '%s'", m_strName.c_str());
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return FALSE;
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}
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return TRUE;
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}
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void wxTempFile::Discard()
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{
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m_file.Close();
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if ( remove(m_strTemp) != 0 )
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wxLogSysError("can't remove temporary file '%s'", m_strTemp.c_str());
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}
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