src/common/file.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        file.cpp
// Purpose:     wxFile - encapsulates low-level "file descriptor"
//              wxTempFile
// Author:      Vadim Zeitlin
// Modified by:
// Created:     29/01/98
// RCS-ID:      $Id$
// Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

#ifdef __GNUG__
#pragma implementation "file.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#include "wx/defs.h"

#ifdef __BORLANDC__
#pragma hdrstop
#endif

// standard
#if   defined(__WXMSW__) && !defined(__GNUWIN32__)
  #include  <io.h>

  #define   WIN32_LEAN_AND_MEAN
  #define   NOSERVICE
  #define   NOIME
  #define   NOATOM
  #define   NOGDI
  #define   NOGDICAPMASKS
  #define   NOMETAFILE
  #define   NOMINMAX
  #define   NOMSG
  #define   NOOPENFILE
  #define   NORASTEROPS
  #define   NOSCROLL
  #define   NOSOUND
  #define   NOSYSMETRICS
  #define   NOTEXTMETRIC
  #define   NOWH
  #define   NOCOMM
  #define   NOKANJI
  #define   NOCRYPT
  #define   NOMCX
  #include  <windows.h>     // for GetTempFileName
#elif (defined(__UNIX__) || defined(__GNUWIN32__))
  #include  <unistd.h>
#elif (defined(__WXSTUBS__))
  // Have to ifdef this for different environments
  #include <io.h>
#else
  #error  "Please specify the header with file functions declarations."
#endif  //Win/UNIX

#include  <stdio.h>       // SEEK_xxx constants
#include  <fcntl.h>       // O_RDONLY &c
#include  <sys/types.h>   // needed for stat
#include  <sys/stat.h>    // stat

// Microsoft compiler loves underscores, feed them to it
#ifdef    _MSC_VER
  // functions
  #define   open        _open
  #define   close       _close
  #define   read        _read
  #define   write       _write
  #define   lseek       _lseek
  #define   fsync       _commit
  #define   access      _access
  #define   eof         _eof

  // types
  #define   stat        _stat

  // constants
  #define   O_RDONLY    _O_RDONLY
  #define   O_WRONLY    _O_WRONLY
  #define   O_RDWR      _O_RDWR
  #define   O_EXCL      _O_EXCL
  #define   O_CREAT     _O_CREAT
  #define   O_BINARY    _O_BINARY

  #define   S_IFDIR     _S_IFDIR
  #define   S_IFREG     _S_IFREG

  #define   W_OK        2
  #define   R_OK        4
#else
  #define   tell(fd)    lseek(fd, 0, SEEK_CUR)
#endif  //_MSC_VER

#ifdef __BORLANDC__
  #define   W_OK        2
  #define   R_OK        4
#endif

// there is no distinction between text and binary files under Unix
#ifdef    __UNIX__
  #define   O_BINARY    (0)
#endif  //__UNIX__

// wxWindows
#include  <wx/string.h>
#include  <wx/intl.h>
#include  <wx/file.h>
#include  <wx/log.h>

#ifndef MAX_PATH
#define MAX_PATH 512
#endif

// ============================================================================
// implementation of wxFile
// ============================================================================

// ----------------------------------------------------------------------------
// static functions
// ----------------------------------------------------------------------------
bool wxFile::Exists(const char *name)
{
  struct stat st;
  return !access(name, 0) && !stat(name, &st) && (st.st_mode & S_IFREG);
}

bool wxFile::Access(const char *name, OpenMode mode)
{
  int how;

  switch ( mode ) {
    case read:
      how = R_OK;
      break;

    case write:
      how = W_OK;
      break;

    default:
      wxFAIL_MSG("bad wxFile::Access mode parameter.");
  }

  return access(name, how) == 0;
}

// ----------------------------------------------------------------------------
// opening/closing
// ----------------------------------------------------------------------------

// ctors
wxFile::wxFile(const char *szFileName, OpenMode mode)
{
  m_fd = fd_invalid;
  m_error = FALSE;

  Open(szFileName, mode);
}

// dtor
wxFile::~wxFile()
{
  Close();
}

// create the file, fail if it already exists and bOverwrite
bool wxFile::Create(const char *szFileName, bool bOverwrite, int access)
{
  // if bOverwrite we create a new file or truncate the existing one,
  // otherwise we only create the new file and fail if it already exists
  int fd = open(szFileName, O_CREAT | (bOverwrite ? O_TRUNC : O_EXCL), access);

  if ( fd == -1 ) {
    wxLogSysError(_("can't create file '%s'"), szFileName);
    return FALSE;
  }
  else {
    Attach(fd);
    return TRUE;
  }
}

// open the file
bool wxFile::Open(const char *szFileName, OpenMode mode, int access)
{
  int flags = O_BINARY;

  switch ( mode ) {
    case read:
      flags |= O_RDONLY;
      break;

    case write:
      flags |= O_WRONLY | O_CREAT | O_TRUNC;
      break;

    case write_append:
      flags |= O_WRONLY | O_APPEND;
      break;

    case read_write:
      flags |= O_RDWR;
      break;
  }

  int fd = open(szFileName, flags, access);

  if ( fd == -1 ) {
    wxLogSysError(_("can't open file '%s'"), szFileName);
    return FALSE;
  }
  else {
    Attach(fd);
    return TRUE;
  }
}

// close
bool wxFile::Close()
{
  if ( IsOpened() ) {
    if ( close(m_fd) == -1 ) {
      wxLogSysError(_("can't close file descriptor %d"), m_fd);
      m_fd = fd_invalid;
      return FALSE;
    }
    else
      m_fd = fd_invalid;
  }

  return TRUE;
}

// ----------------------------------------------------------------------------
// read/write
// ----------------------------------------------------------------------------

// read
off_t wxFile::Read(void *pBuf, off_t nCount)
{
  wxCHECK( (pBuf != NULL) && IsOpened(), 0 );

  int iRc = ::read(m_fd, pBuf, nCount);
  if ( iRc == -1 ) {
    wxLogSysError(_("can't read from file descriptor %d"), m_fd);
    return wxInvalidOffset;
  }
  else
    return (size_t)iRc;
}

// write
size_t wxFile::Write(const void *pBuf, size_t nCount)
{
  wxCHECK( (pBuf != NULL) && IsOpened(), 0 );

  int iRc = ::write(m_fd, pBuf, nCount);
  if ( iRc == -1 ) {
    wxLogSysError(_("can't write to file descriptor %d"), m_fd);
    m_error = TRUE;
    return 0;
  }
  else
    return iRc;
}

// flush
bool wxFile::Flush()
{
  if ( IsOpened() ) {
		// @@@ fsync() is not ANSI (BSDish)
//    if ( fsync(m_fd) == -1 ) { // TODO
      if (TRUE) {
      wxLogSysError(_("can't flush file descriptor %d"), m_fd);
      return FALSE;
    }
  }

  return TRUE;
}

// ----------------------------------------------------------------------------
// seek
// ----------------------------------------------------------------------------

// seek
off_t wxFile::Seek(off_t ofs, wxSeekMode mode)
{
  wxASSERT( IsOpened() );

  int flag = -1;
  switch ( mode ) {
    case wxFromStart:
      flag = SEEK_SET;
      break;

    case wxFromCurrent:
      flag = SEEK_CUR;
      break;

    case wxFromEnd:
      flag = SEEK_END;
      break;

    default:
      wxFAIL_MSG(_("unknown seek origin"));
  }

  int iRc = lseek(m_fd, ofs, flag);
  if ( iRc == -1 ) {
    wxLogSysError(_("can't seek on file descriptor %d"), m_fd);
    return wxInvalidOffset;
  }
  else
    return (off_t)iRc;
}

// get current off_t
off_t wxFile::Tell() const
{
  wxASSERT( IsOpened() );

  int iRc = tell(m_fd);
  if ( iRc == -1 ) {
    wxLogSysError(_("can't get seek position on file descriptor %d"), m_fd);
    return wxInvalidOffset;
  }
  else
    return (off_t)iRc;
}

// get current file length
off_t wxFile::Length() const
{
  wxASSERT( IsOpened() );

  #ifdef  _MSC_VER
    int iRc = _filelength(m_fd);
  #else
    int iRc = tell(m_fd);
    if ( iRc != -1 ) {
      // @ have to use const_cast :-(
      int iLen = ((wxFile *)this)->SeekEnd();
      if ( iLen != -1 ) {
        // restore old position
        if ( ((wxFile *)this)->Seek(iRc) == -1 ) {
          // error
          iLen = -1;
        }
      }

      iRc = iLen;
    }

  #endif  //_MSC_VER

  if ( iRc == -1 ) {
    wxLogSysError(_("can't find length of file on file descriptor %d"), m_fd);
    return wxInvalidOffset;
  }
  else
    return (off_t)iRc;
}

// is end of file reached?
bool wxFile::Eof() const
{
  wxASSERT( IsOpened() );

  int iRc;

  #if defined(__UNIX__) || defined(__GNUWIN32__)
    // @@ this doesn't work, of course, on unseekable file descriptors
    off_t ofsCur = Tell(),
          ofsMax = Length();
    if ( ofsCur == wxInvalidOffset || ofsMax == wxInvalidOffset )
      iRc = -1;
    else
     iRc = ofsCur == ofsMax;
  #else  // Windows and "native" compiler
    iRc = eof(m_fd);
  #endif // Windows/Unix

  switch ( iRc ) {
    case 1:
      break;

    case 0:
      return FALSE;

    case -1:
      wxLogSysError(_("can't determine if the end of file is reached on \
descriptor %d"), m_fd);
      break;

    default:
      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)
{
  m_strName = strName;

  // we want to create the file in the same directory as strName because
  // otherwise rename() in Commit() might not work (if the files are on
  // different partitions for example). Unfortunately, the only standard
  // (POSIX) temp file creation function tmpnam() can't do it.
  #if defined(__UNIX__) || defined(__WXSTUBS__)
    static const char *szMktempSuffix = "XXXXXX";
    m_strTemp << strName << szMktempSuffix;
    mktemp((char *)m_strTemp.c_str()); // will do because length doesn't change
  #else // Windows
    wxString strPath;
    wxSplitPath(strName, &strPath, NULL, NULL);
    if ( strPath.IsEmpty() )
      strPath = '.';  // GetTempFileName will fail if we give it empty string
#ifdef __WIN32__
    if ( !GetTempFileName(strPath, "wx_",0, m_strTemp.GetWriteBuf(MAX_PATH)) )
#else
    // Not sure why MSVC++ 1.5 header defines first param as BYTE - bug?
    if ( !GetTempFileName((BYTE) (const char*) strPath, "wx_",0, m_strTemp.GetWriteBuf(MAX_PATH)) )
#endif
      wxLogLastError("GetTempFileName");
    m_strTemp.UngetWriteBuf();
  #endif  // Windows/Unix

  return m_file.Open(m_strTemp, wxFile::write);
}

// ----------------------------------------------------------------------------
// destruction
// ----------------------------------------------------------------------------

wxTempFile::~wxTempFile()
{
  if ( IsOpened() )
    Discard();
}

bool wxTempFile::Commit()
{
  m_file.Close();

  if ( wxFile::Exists(m_strName) && remove(m_strName) != 0 ) {
    wxLogSysError(_("can't remove file '%s'"), m_strName.c_str());
    return FALSE;
  }

  if ( rename(m_strTemp, m_strName) != 0 ) {
    wxLogSysError(_("can't commit changes to file '%s'"), m_strName.c_str());
    return FALSE;
  }

  return TRUE;
}

void wxTempFile::Discard()
{
  m_file.Close();
  if ( remove(m_strTemp) != 0 )
    wxLogSysError(_("can't remove temporary file '%s'"), m_strTemp.c_str());
}
Commit	Line	Data
	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: file.cpp
	3	// Purpose: wxFile - encapsulates low-level "file descriptor"
	4	// wxTempFile
	5	// Author: Vadim Zeitlin
	6	// Modified by:
	7	// Created: 29/01/98
	8	// RCS-ID: $Id$
	9	// Copyright: (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
	10	// Licence: wxWindows license
	11	/////////////////////////////////////////////////////////////////////////////
	12
	13	// ----------------------------------------------------------------------------
	14	// headers
	15	// ----------------------------------------------------------------------------
	16
	17	#ifdef __GNUG__
	18	#pragma implementation "file.h"
	19	#endif
	20
	21	// For compilers that support precompilation, includes "wx.h".
	22	#include "wx/wxprec.h"
	23	#include "wx/defs.h"
	24
	25	#ifdef __BORLANDC__
	26	#pragma hdrstop
	27	#endif
	28
	29	// standard
	30	#if defined(__WXMSW__) && !defined(__GNUWIN32__)
	31	#include <io.h>
	32
	33	#define WIN32_LEAN_AND_MEAN
	34	#define NOSERVICE
	35	#define NOIME
	36	#define NOATOM
	37	#define NOGDI
	38	#define NOGDICAPMASKS
	39	#define NOMETAFILE
	40	#define NOMINMAX
	41	#define NOMSG
	42	#define NOOPENFILE
	43	#define NORASTEROPS
	44	#define NOSCROLL
	45	#define NOSOUND
	46	#define NOSYSMETRICS
	47	#define NOTEXTMETRIC
	48	#define NOWH
	49	#define NOCOMM
	50	#define NOKANJI
	51	#define NOCRYPT
	52	#define NOMCX
	53	#include <windows.h> // for GetTempFileName
	54	#elif (defined(__UNIX__) \|\| defined(__GNUWIN32__))
	55	#include <unistd.h>
	56	#elif (defined(__WXSTUBS__))
	57	// Have to ifdef this for different environments
	58	#include <io.h>
	59	#else
	60	#error "Please specify the header with file functions declarations."
	61	#endif //Win/UNIX
	62
	63	#include <stdio.h> // SEEK_xxx constants
	64	#include <fcntl.h> // O_RDONLY &c
	65	#include <sys/types.h> // needed for stat
	66	#include <sys/stat.h> // stat
	67
	68	// Microsoft compiler loves underscores, feed them to it
	69	#ifdef _MSC_VER
	70	// functions
	71	#define open _open
	72	#define close _close
	73	#define read _read
	74	#define write _write
	75	#define lseek _lseek
	76	#define fsync _commit
	77	#define access _access
	78	#define eof _eof
	79
	80	// types
	81	#define stat _stat
	82
	83	// constants
	84	#define O_RDONLY _O_RDONLY
	85	#define O_WRONLY _O_WRONLY
	86	#define O_RDWR _O_RDWR
	87	#define O_EXCL _O_EXCL
	88	#define O_CREAT _O_CREAT
	89	#define O_BINARY _O_BINARY
	90
	91	#define S_IFDIR _S_IFDIR
	92	#define S_IFREG _S_IFREG
	93
	94	#define W_OK 2
	95	#define R_OK 4
	96	#else
	97	#define tell(fd) lseek(fd, 0, SEEK_CUR)
	98	#endif //_MSC_VER
	99
	100	#ifdef __BORLANDC__
	101	#define W_OK 2
	102	#define R_OK 4
	103	#endif
	104
	105	// there is no distinction between text and binary files under Unix
	106	#ifdef __UNIX__
	107	#define O_BINARY (0)
	108	#endif //__UNIX__
	109
	110	// wxWindows
	111	#include <wx/string.h>
	112	#include <wx/intl.h>
	113	#include <wx/file.h>
	114	#include <wx/log.h>
	115
	116	#ifndef MAX_PATH
	117	#define MAX_PATH 512
	118	#endif
	119
	120	// ============================================================================
	121	// implementation of wxFile
	122	// ============================================================================
	123
	124	// ----------------------------------------------------------------------------
	125	// static functions
	126	// ----------------------------------------------------------------------------
	127	bool wxFile::Exists(const char *name)
	128	{
	129	struct stat st;
	130	return !access(name, 0) && !stat(name, &st) && (st.st_mode & S_IFREG);
	131	}
	132
	133	bool wxFile::Access(const char *name, OpenMode mode)
	134	{
	135	int how;
	136
	137	switch ( mode ) {
	138	case read:
	139	how = R_OK;
	140	break;
	141
	142	case write:
	143	how = W_OK;
	144	break;
	145
	146	default:
	147	wxFAIL_MSG("bad wxFile::Access mode parameter.");
	148	}
	149
	150	return access(name, how) == 0;
	151	}
	152
	153	// ----------------------------------------------------------------------------
	154	// opening/closing
	155	// ----------------------------------------------------------------------------
	156
	157	// ctors
	158	wxFile::wxFile(const char *szFileName, OpenMode mode)
	159	{
	160	m_fd = fd_invalid;
	161	m_error = FALSE;
	162
	163	Open(szFileName, mode);
	164	}
	165
	166	// dtor
	167	wxFile::~wxFile()
	168	{
	169	Close();
	170	}
	171
	172	// create the file, fail if it already exists and bOverwrite
	173	bool wxFile::Create(const char *szFileName, bool bOverwrite, int access)
	174	{
	175	// if bOverwrite we create a new file or truncate the existing one,
	176	// otherwise we only create the new file and fail if it already exists
	177	int fd = open(szFileName, O_CREAT \| (bOverwrite ? O_TRUNC : O_EXCL), access);
	178
	179	if ( fd == -1 ) {
	180	wxLogSysError(_("can't create file '%s'"), szFileName);
	181	return FALSE;
	182	}
	183	else {
	184	Attach(fd);
	185	return TRUE;
	186	}
	187	}
	188
	189	// open the file
	190	bool wxFile::Open(const char *szFileName, OpenMode mode, int access)
	191	{
	192	int flags = O_BINARY;
	193
	194	switch ( mode ) {
	195	case read:
	196	flags \|= O_RDONLY;
	197	break;
	198
	199	case write:
	200	flags \|= O_WRONLY \| O_CREAT \| O_TRUNC;
	201	break;
	202
	203	case write_append:
	204	flags \|= O_WRONLY \| O_APPEND;
	205	break;
	206
	207	case read_write:
	208	flags \|= O_RDWR;
	209	break;
	210	}
	211
	212	int fd = open(szFileName, flags, access);
	213
	214	if ( fd == -1 ) {
	215	wxLogSysError(_("can't open file '%s'"), szFileName);
	216	return FALSE;
	217	}
	218	else {
	219	Attach(fd);
	220	return TRUE;
	221	}
	222	}
	223
	224	// close
	225	bool wxFile::Close()
	226	{
	227	if ( IsOpened() ) {
	228	if ( close(m_fd) == -1 ) {
	229	wxLogSysError(_("can't close file descriptor %d"), m_fd);
	230	m_fd = fd_invalid;
	231	return FALSE;
	232	}
	233	else
	234	m_fd = fd_invalid;
	235	}
	236
	237	return TRUE;
	238	}
	239
	240	// ----------------------------------------------------------------------------
	241	// read/write
	242	// ----------------------------------------------------------------------------
	243
	244	// read
	245	off_t wxFile::Read(void *pBuf, off_t nCount)
	246	{
	247	wxCHECK( (pBuf != NULL) && IsOpened(), 0 );
	248
	249	int iRc = ::read(m_fd, pBuf, nCount);
	250	if ( iRc == -1 ) {
	251	wxLogSysError(_("can't read from file descriptor %d"), m_fd);
	252	return wxInvalidOffset;
	253	}
	254	else
	255	return (size_t)iRc;
	256	}
	257
	258	// write
	259	size_t wxFile::Write(const void *pBuf, size_t nCount)
	260	{
	261	wxCHECK( (pBuf != NULL) && IsOpened(), 0 );
	262
	263	int iRc = ::write(m_fd, pBuf, nCount);
	264	if ( iRc == -1 ) {
	265	wxLogSysError(_("can't write to file descriptor %d"), m_fd);
	266	m_error = TRUE;
	267	return 0;
	268	}
	269	else
	270	return iRc;
	271	}
	272
	273	// flush
	274	bool wxFile::Flush()
	275	{
	276	if ( IsOpened() ) {
	277	// @@@ fsync() is not ANSI (BSDish)
	278	// if ( fsync(m_fd) == -1 ) { // TODO
	279	if (TRUE) {
	280	wxLogSysError(_("can't flush file descriptor %d"), m_fd);
	281	return FALSE;
	282	}
	283	}
	284
	285	return TRUE;
	286	}
	287
	288	// ----------------------------------------------------------------------------
	289	// seek
	290	// ----------------------------------------------------------------------------
	291
	292	// seek
	293	off_t wxFile::Seek(off_t ofs, wxSeekMode mode)
	294	{
	295	wxASSERT( IsOpened() );
	296
	297	int flag = -1;
	298	switch ( mode ) {
	299	case wxFromStart:
	300	flag = SEEK_SET;
	301	break;
	302
	303	case wxFromCurrent:
	304	flag = SEEK_CUR;
	305	break;
	306
	307	case wxFromEnd:
	308	flag = SEEK_END;
	309	break;
	310
	311	default:
	312	wxFAIL_MSG(_("unknown seek origin"));
	313	}
	314
	315	int iRc = lseek(m_fd, ofs, flag);
	316	if ( iRc == -1 ) {
	317	wxLogSysError(_("can't seek on file descriptor %d"), m_fd);
	318	return wxInvalidOffset;
	319	}
	320	else
	321	return (off_t)iRc;
	322	}
	323
	324	// get current off_t
	325	off_t wxFile::Tell() const
	326	{
	327	wxASSERT( IsOpened() );
	328
	329	int iRc = tell(m_fd);
	330	if ( iRc == -1 ) {
	331	wxLogSysError(_("can't get seek position on file descriptor %d"), m_fd);
	332	return wxInvalidOffset;
	333	}
	334	else
	335	return (off_t)iRc;
	336	}
	337
	338	// get current file length
	339	off_t wxFile::Length() const
	340	{
	341	wxASSERT( IsOpened() );
	342
	343	#ifdef _MSC_VER
	344	int iRc = _filelength(m_fd);
	345	#else
	346	int iRc = tell(m_fd);
	347	if ( iRc != -1 ) {
	348	// @ have to use const_cast :-(
	349	int iLen = ((wxFile *)this)->SeekEnd();
	350	if ( iLen != -1 ) {
	351	// restore old position
	352	if ( ((wxFile *)this)->Seek(iRc) == -1 ) {
	353	// error
	354	iLen = -1;
	355	}
	356	}
	357
	358	iRc = iLen;
	359	}
	360
	361	#endif //_MSC_VER
	362
	363	if ( iRc == -1 ) {
	364	wxLogSysError(_("can't find length of file on file descriptor %d"), m_fd);
	365	return wxInvalidOffset;
	366	}
	367	else
	368	return (off_t)iRc;
	369	}
	370
	371	// is end of file reached?
	372	bool wxFile::Eof() const
	373	{
	374	wxASSERT( IsOpened() );
	375
	376	int iRc;
	377
	378	#if defined(__UNIX__) \|\| defined(__GNUWIN32__)
	379	// @@ this doesn't work, of course, on unseekable file descriptors
	380	off_t ofsCur = Tell(),
	381	ofsMax = Length();
	382	if ( ofsCur == wxInvalidOffset \|\| ofsMax == wxInvalidOffset )
	383	iRc = -1;
	384	else
	385	iRc = ofsCur == ofsMax;
	386	#else // Windows and "native" compiler
	387	iRc = eof(m_fd);
	388	#endif // Windows/Unix
	389
	390	switch ( iRc ) {
	391	case 1:
	392	break;
	393
	394	case 0:
	395	return FALSE;
	396
	397	case -1:
	398	wxLogSysError(_("can't determine if the end of file is reached on \
	399	descriptor %d"), m_fd);
	400	break;
	401
	402	default:
	403	wxFAIL_MSG(_("invalid eof() return value."));
	404	}
	405
	406	return TRUE;
	407	}
	408
	409	// ============================================================================
	410	// implementation of wxTempFile
	411	// ============================================================================
	412
	413	// ----------------------------------------------------------------------------
	414	// construction
	415	// ----------------------------------------------------------------------------
	416	wxTempFile::wxTempFile(const wxString& strName)
	417	{
	418	Open(strName);
	419	}
	420
	421	bool wxTempFile::Open(const wxString& strName)
	422	{
	423	m_strName = strName;
	424
	425	// we want to create the file in the same directory as strName because
	426	// otherwise rename() in Commit() might not work (if the files are on
	427	// different partitions for example). Unfortunately, the only standard
	428	// (POSIX) temp file creation function tmpnam() can't do it.
	429	#if defined(__UNIX__) \|\| defined(__WXSTUBS__)
	430	static const char *szMktempSuffix = "XXXXXX";
	431	m_strTemp << strName << szMktempSuffix;
	432	mktemp((char *)m_strTemp.c_str()); // will do because length doesn't change
	433	#else // Windows
	434	wxString strPath;
	435	wxSplitPath(strName, &strPath, NULL, NULL);
	436	if ( strPath.IsEmpty() )
	437	strPath = '.'; // GetTempFileName will fail if we give it empty string
	438	#ifdef __WIN32__
	439	if ( !GetTempFileName(strPath, "wx_",0, m_strTemp.GetWriteBuf(MAX_PATH)) )
	440	#else
	441	// Not sure why MSVC++ 1.5 header defines first param as BYTE - bug?
	442	if ( !GetTempFileName((BYTE) (const char*) strPath, "wx_",0, m_strTemp.GetWriteBuf(MAX_PATH)) )
	443	#endif
	444	wxLogLastError("GetTempFileName");
	445	m_strTemp.UngetWriteBuf();
	446	#endif // Windows/Unix
	447
	448	return m_file.Open(m_strTemp, wxFile::write);
	449	}
	450
	451	// ----------------------------------------------------------------------------
	452	// destruction
	453	// ----------------------------------------------------------------------------
	454
	455	wxTempFile::~wxTempFile()
	456	{
	457	if ( IsOpened() )
	458	Discard();
	459	}
	460
	461	bool wxTempFile::Commit()
	462	{
	463	m_file.Close();
	464
	465	if ( wxFile::Exists(m_strName) && remove(m_strName) != 0 ) {
	466	wxLogSysError(_("can't remove file '%s'"), m_strName.c_str());
	467	return FALSE;
	468	}
	469
	470	if ( rename(m_strTemp, m_strName) != 0 ) {
	471	wxLogSysError(_("can't commit changes to file '%s'"), m_strName.c_str());
	472	return FALSE;
	473	}
	474
	475	return TRUE;
	476	}
	477
	478	void wxTempFile::Discard()
	479	{
	480	m_file.Close();
	481	if ( remove(m_strTemp) != 0 )
	482	wxLogSysError(_("can't remove temporary file '%s'"), m_strTemp.c_str());
	483	}