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"

#ifdef __BORLANDC__
  #pragma hdrstop
#endif

#if wxUSE_FILE

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

#ifndef __SALFORDC__
    #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
#endif

    #include  <windows.h>     // for GetTempFileName
#elif (defined(__UNIX__) || defined(__GNUWIN32__))
    #include  <unistd.h>
    #ifdef __GNUWIN32__
        #include <windows.h>
    #endif
#elif (defined(__WXSTUBS__))
    // Have to ifdef this for different environments
    #include <io.h>
#elif (defined(__WXMAC__))
    int access( const char *path, int mode ) { return 0 ; }
    char* mktemp( char * path ) { return path ;}
    #include  <unistd.h>
    #include  <unix.h>
    #define   W_OK        2
    #define   R_OK        4
#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

#ifndef __MWERKS__
    #include  <sys/types.h>   // needed for stat
    #include  <sys/stat.h>    // stat
#endif

// Microsoft compiler loves underscores, feed them to it
#ifdef  __VISUALC__
    // 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
#else
    #define   tell(fd)    lseek(fd, 0, SEEK_CUR)
#endif  // VC++

#if defined(__BORLANDC__) || defined(_MSC_VER)
    #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__

#ifdef __SALFORDC__
    #include <unix.h>
#endif

// 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

#ifdef __WXMAC__
    char gwxMacFileName[ MAX_PATH ] ;
    char gwxMacFileName2[ MAX_PATH ] ;
    char gwxMacFileName3[ MAX_PATH ] ;
#endif

// some broken compilers don't have 3rd argument in open() and creat()
#ifdef __SALFORDC__
    #define ACCESS(access)
    #define stat    _stat
#else // normal compiler
    #define ACCESS(access)  , (access)
#endif // Salford C

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

// ----------------------------------------------------------------------------
// static functions
// ----------------------------------------------------------------------------
bool wxFile::Exists(const wxChar *name)
{
    struct stat st;
#if wxUSE_UNICODE && wxMBFILES
    wxCharBuffer fname = wxConvFile.cWC2MB(name);

    return !access(fname, 0) &&
           !stat(MBSTRINGCAST fname, &st) &&
           (st.st_mode & S_IFREG);
#else
    return !access(name, 0) &&
           !stat((wxChar*) name, &st) &&
           (st.st_mode & S_IFREG);
#endif
}

bool wxFile::Access(const wxChar *name, OpenMode mode)
{
    int how = 0;

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

        case write:
            how = W_OK;
            break;

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

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

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

// ctors
wxFile::wxFile(const wxChar *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 wxChar *szFileName, bool bOverwrite, int accessMode)
{
    // 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(wxFNCONV(szFileName),
                  O_WRONLY | O_CREAT | (bOverwrite ? O_TRUNC : O_EXCL)
                  ACCESS(accessMode));

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

// open the file
bool wxFile::Open(const wxChar *szFileName, OpenMode mode, int accessMode)
{
    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(wxFNCONV(szFileName), flags ACCESS(accessMode));

    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 );

#ifdef __MWERKS__
    int iRc = ::read(m_fd, (char*) pBuf, nCount);
#else
    int iRc = ::read(m_fd, pBuf, nCount);
#endif
    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 );

#ifdef __MWERKS__
    int iRc = ::write(m_fd, (const char*) pBuf, nCount);
#else
    int iRc = ::write(m_fd, pBuf, nCount);
#endif
    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() ) {
#if defined(__VISUALC__) || wxHAVE_FSYNC
        if ( fsync(m_fd) == -1 )
        {
            wxLogSysError(_("can't flush file descriptor %d"), m_fd);
            return FALSE;
        }
#else // no fsync
        // just do nothing
#endif // fsync
    }

    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 __VISUALC__
    int iRc = _filelength(m_fd);
#else // !VC++
    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  // VC++

    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__) || defined( __MWERKS__ ) || defined(__SALFORDC__)
    // @@ 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__)|| defined( __WXMAC__ )
    static const wxChar *szMktempSuffix = _T("XXXXXX");
    m_strTemp << strName << szMktempSuffix;
    mktemp(MBSTRINGCAST m_strTemp.mb_str()); // will do because length doesn't change
#else // Windows
    wxString strPath;
    wxSplitPath(strName, &strPath, NULL, NULL);
    if ( strPath.IsEmpty() )
        strPath = _T('.');  // GetTempFileName will fail if we give it empty string
#ifdef __WIN32__
    if ( !GetTempFileName(strPath, _T("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 wxChar*) strPath, _T("wx_"),0, m_strTemp.GetWriteBuf(MAX_PATH)) )
#endif
            wxLogLastError(_T("GetTempFileName"));
    m_strTemp.UngetWriteBuf();
#endif  // Windows/Unix

    int access = wxS_DEFAULT;
#ifdef __UNIX__
    // create the file with the same mode as the original one under Unix
    mode_t umaskOld = 0; // just to suppress compiler warning
    bool changedUmask;

    struct stat st;
    if ( stat(strName.fn_str(), &st) == 0 )
    {
        // this assumes that only lower bits of st_mode contain the access
        // rights, but it's true for at least all Unices which have S_IXXXX()
        // macros, so should not be less portable than using (not POSIX)
        // S_IFREG &c
        access = st.st_mode & 0777;

        // we want to create the file with exactly the same access rights as
        // the original one, so disable the user's umask for the moment
        umaskOld = umask(0);
        changedUmask = TRUE;
    }
    else
    {
        // file probably didn't exist, just create with default mode _using_
        // user's umask (new files creation should respet umask)
        changedUmask = FALSE;
    }
#endif // Unix

    bool ok = m_file.Open(m_strTemp, wxFile::write, access);

#ifdef __UNIX__
    if ( changedUmask )
    {
        // restore umask now that the file is created
        (void)umask(umaskOld);
    }
#endif // Unix

    return ok;
}

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

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

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

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

    if ( rename(m_strTemp.fn_str(), m_strName.fn_str()) != 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.fn_str()) != 0 )
        wxLogSysError(_("can't remove temporary file '%s'"), m_strTemp.c_str());
}

#endif
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
	24	#ifdef __BORLANDC__
	25	#pragma hdrstop
	26	#endif
	27
	28	#if wxUSE_FILE
	29
	30	// standard
	31	#if defined(__WXMSW__) && !defined(__GNUWIN32__) && !defined(__WXWINE__)
	32	#include <io.h>
	33
	34	#ifndef __SALFORDC__
	35	#define WIN32_LEAN_AND_MEAN
	36	#define NOSERVICE
	37	#define NOIME
	38	#define NOATOM
	39	#define NOGDI
	40	#define NOGDICAPMASKS
	41	#define NOMETAFILE
	42	#define NOMINMAX
	43	#define NOMSG
	44	#define NOOPENFILE
	45	#define NORASTEROPS
	46	#define NOSCROLL
	47	#define NOSOUND
	48	#define NOSYSMETRICS
	49	#define NOTEXTMETRIC
	50	#define NOWH
	51	#define NOCOMM
	52	#define NOKANJI
	53	#define NOCRYPT
	54	#define NOMCX
	55	#endif
	56
	57	#include <windows.h> // for GetTempFileName
	58	#elif (defined(__UNIX__) \|\| defined(__GNUWIN32__))
	59	#include <unistd.h>
	60	#ifdef __GNUWIN32__
	61	#include <windows.h>
	62	#endif
	63	#elif (defined(__WXSTUBS__))
	64	// Have to ifdef this for different environments
	65	#include <io.h>
	66	#elif (defined(__WXMAC__))
	67	int access( const char *path, int mode ) { return 0 ; }
	68	char* mktemp( char * path ) { return path ;}
	69	#include <unistd.h>
	70	#include <unix.h>
	71	#define W_OK 2
	72	#define R_OK 4
	73	#else
	74	#error "Please specify the header with file functions declarations."
	75	#endif //Win/UNIX
	76
	77	#include <stdio.h> // SEEK_xxx constants
	78	#include <fcntl.h> // O_RDONLY &c
	79
	80	#ifndef __MWERKS__
	81	#include <sys/types.h> // needed for stat
	82	#include <sys/stat.h> // stat
	83	#endif
	84
	85	// Microsoft compiler loves underscores, feed them to it
	86	#ifdef __VISUALC__
	87	// functions
	88	#define open _open
	89	#define close _close
	90	#define read _read
	91	#define write _write
	92	#define lseek _lseek
	93	#define fsync _commit
	94	#define access _access
	95	#define eof _eof
	96
	97	// types
	98	#define stat _stat
	99
	100	// constants
	101
	102	#define O_RDONLY _O_RDONLY
	103	#define O_WRONLY _O_WRONLY
	104	#define O_RDWR _O_RDWR
	105	#define O_EXCL _O_EXCL
	106	#define O_CREAT _O_CREAT
	107	#define O_BINARY _O_BINARY
	108
	109	#define S_IFDIR _S_IFDIR
	110	#define S_IFREG _S_IFREG
	111	#else
	112	#define tell(fd) lseek(fd, 0, SEEK_CUR)
	113	#endif // VC++
	114
	115	#if defined(__BORLANDC__) \|\| defined(_MSC_VER)
	116	#define W_OK 2
	117	#define R_OK 4
	118	#endif
	119
	120	// there is no distinction between text and binary files under Unix
	121	#ifdef __UNIX__
	122	#define O_BINARY (0)
	123	#endif //__UNIX__
	124
	125	#ifdef __SALFORDC__
	126	#include <unix.h>
	127	#endif
	128
	129	// wxWindows
	130	#include <wx/string.h>
	131	#include <wx/intl.h>
	132	#include <wx/file.h>
	133	#include <wx/log.h>
	134
	135	#ifndef MAX_PATH
	136	#define MAX_PATH 512
	137	#endif
	138
	139	#ifdef __WXMAC__
	140	char gwxMacFileName[ MAX_PATH ] ;
	141	char gwxMacFileName2[ MAX_PATH ] ;
	142	char gwxMacFileName3[ MAX_PATH ] ;
	143	#endif
	144
	145	// some broken compilers don't have 3rd argument in open() and creat()
	146	#ifdef __SALFORDC__
	147	#define ACCESS(access)
	148	#define stat _stat
	149	#else // normal compiler
	150	#define ACCESS(access) , (access)
	151	#endif // Salford C
	152
	153	// ============================================================================
	154	// implementation of wxFile
	155	// ============================================================================
	156
	157	// ----------------------------------------------------------------------------
	158	// static functions
	159	// ----------------------------------------------------------------------------
	160	bool wxFile::Exists(const wxChar *name)
	161	{
	162	struct stat st;
	163	#if wxUSE_UNICODE && wxMBFILES
	164	wxCharBuffer fname = wxConvFile.cWC2MB(name);
	165
	166	return !access(fname, 0) &&
	167	!stat(MBSTRINGCAST fname, &st) &&
	168	(st.st_mode & S_IFREG);
	169	#else
	170	return !access(name, 0) &&
	171	!stat((wxChar*) name, &st) &&
	172	(st.st_mode & S_IFREG);
	173	#endif
	174	}
	175
	176	bool wxFile::Access(const wxChar *name, OpenMode mode)
	177	{
	178	int how = 0;
	179
	180	switch ( mode ) {
	181	case read:
	182	how = R_OK;
	183	break;
	184
	185	case write:
	186	how = W_OK;
	187	break;
	188
	189	default:
	190	wxFAIL_MSG(_T("bad wxFile::Access mode parameter."));
	191	}
	192
	193	return access(wxFNCONV(name), how) == 0;
	194	}
	195
	196	// ----------------------------------------------------------------------------
	197	// opening/closing
	198	// ----------------------------------------------------------------------------
	199
	200	// ctors
	201	wxFile::wxFile(const wxChar *szFileName, OpenMode mode)
	202	{
	203	m_fd = fd_invalid;
	204	m_error = FALSE;
	205
	206	Open(szFileName, mode);
	207	}
	208
	209	// dtor
	210	wxFile::~wxFile()
	211	{
	212	Close();
	213	}
	214
	215	// create the file, fail if it already exists and bOverwrite
	216	bool wxFile::Create(const wxChar *szFileName, bool bOverwrite, int accessMode)
	217	{
	218	// if bOverwrite we create a new file or truncate the existing one,
	219	// otherwise we only create the new file and fail if it already exists
	220	int fd = open(wxFNCONV(szFileName),
	221	O_WRONLY \| O_CREAT \| (bOverwrite ? O_TRUNC : O_EXCL)
	222	ACCESS(accessMode));
	223
	224	if ( fd == -1 ) {
	225	wxLogSysError(_("can't create file '%s'"), szFileName);
	226	return FALSE;
	227	}
	228	else {
	229	Attach(fd);
	230	return TRUE;
	231	}
	232	}
	233
	234	// open the file
	235	bool wxFile::Open(const wxChar *szFileName, OpenMode mode, int accessMode)
	236	{
	237	int flags = O_BINARY;
	238
	239	switch ( mode ) {
	240	case read:
	241	flags \|= O_RDONLY;
	242	break;
	243
	244	case write:
	245	flags \|= O_WRONLY \| O_CREAT \| O_TRUNC;
	246	break;
	247
	248	case write_append:
	249	flags \|= O_WRONLY \| O_APPEND;
	250	break;
	251
	252	case read_write:
	253	flags \|= O_RDWR;
	254	break;
	255	}
	256
	257	int fd = open(wxFNCONV(szFileName), flags ACCESS(accessMode));
	258
	259	if ( fd == -1 ) {
	260	wxLogSysError(_("can't open file '%s'"), szFileName);
	261	return FALSE;
	262	}
	263	else {
	264	Attach(fd);
	265	return TRUE;
	266	}
	267	}
	268
	269	// close
	270	bool wxFile::Close()
	271	{
	272	if ( IsOpened() ) {
	273	if ( close(m_fd) == -1 ) {
	274	wxLogSysError(_("can't close file descriptor %d"), m_fd);
	275	m_fd = fd_invalid;
	276	return FALSE;
	277	}
	278	else
	279	m_fd = fd_invalid;
	280	}
	281
	282	return TRUE;
	283	}
	284
	285	// ----------------------------------------------------------------------------
	286	// read/write
	287	// ----------------------------------------------------------------------------
	288
	289	// read
	290	off_t wxFile::Read(void *pBuf, off_t nCount)
	291	{
	292	wxCHECK( (pBuf != NULL) && IsOpened(), 0 );
	293
	294	#ifdef __MWERKS__
	295	int iRc = ::read(m_fd, (char*) pBuf, nCount);
	296	#else
	297	int iRc = ::read(m_fd, pBuf, nCount);
	298	#endif
	299	if ( iRc == -1 ) {
	300	wxLogSysError(_("can't read from file descriptor %d"), m_fd);
	301	return wxInvalidOffset;
	302	}
	303	else
	304	return (size_t)iRc;
	305	}
	306
	307	// write
	308	size_t wxFile::Write(const void *pBuf, size_t nCount)
	309	{
	310	wxCHECK( (pBuf != NULL) && IsOpened(), 0 );
	311
	312	#ifdef __MWERKS__
	313	int iRc = ::write(m_fd, (const char*) pBuf, nCount);
	314	#else
	315	int iRc = ::write(m_fd, pBuf, nCount);
	316	#endif
	317	if ( iRc == -1 ) {
	318	wxLogSysError(_("can't write to file descriptor %d"), m_fd);
	319	m_error = TRUE;
	320	return 0;
	321	}
	322	else
	323	return iRc;
	324	}
	325
	326	// flush
	327	bool wxFile::Flush()
	328	{
	329	if ( IsOpened() ) {
	330	#if defined(__VISUALC__) \|\| wxHAVE_FSYNC
	331	if ( fsync(m_fd) == -1 )
	332	{
	333	wxLogSysError(_("can't flush file descriptor %d"), m_fd);
	334	return FALSE;
	335	}
	336	#else // no fsync
	337	// just do nothing
	338	#endif // fsync
	339	}
	340
	341	return TRUE;
	342	}
	343
	344	// ----------------------------------------------------------------------------
	345	// seek
	346	// ----------------------------------------------------------------------------
	347
	348	// seek
	349	off_t wxFile::Seek(off_t ofs, wxSeekMode mode)
	350	{
	351	wxASSERT( IsOpened() );
	352
	353	int flag = -1;
	354	switch ( mode ) {
	355	case wxFromStart:
	356	flag = SEEK_SET;
	357	break;
	358
	359	case wxFromCurrent:
	360	flag = SEEK_CUR;
	361	break;
	362
	363	case wxFromEnd:
	364	flag = SEEK_END;
	365	break;
	366
	367	default:
	368	wxFAIL_MSG(_("unknown seek origin"));
	369	}
	370
	371	int iRc = lseek(m_fd, ofs, flag);
	372	if ( iRc == -1 ) {
	373	wxLogSysError(_("can't seek on file descriptor %d"), m_fd);
	374	return wxInvalidOffset;
	375	}
	376	else
	377	return (off_t)iRc;
	378	}
	379
	380	// get current off_t
	381	off_t wxFile::Tell() const
	382	{
	383	wxASSERT( IsOpened() );
	384
	385	int iRc = tell(m_fd);
	386	if ( iRc == -1 ) {
	387	wxLogSysError(_("can't get seek position on file descriptor %d"), m_fd);
	388	return wxInvalidOffset;
	389	}
	390	else
	391	return (off_t)iRc;
	392	}
	393
	394	// get current file length
	395	off_t wxFile::Length() const
	396	{
	397	wxASSERT( IsOpened() );
	398
	399	#ifdef __VISUALC__
	400	int iRc = _filelength(m_fd);
	401	#else // !VC++
	402	int iRc = tell(m_fd);
	403	if ( iRc != -1 ) {
	404	// @ have to use const_cast :-(
	405	int iLen = ((wxFile *)this)->SeekEnd();
	406	if ( iLen != -1 ) {
	407	// restore old position
	408	if ( ((wxFile *)this)->Seek(iRc) == -1 ) {
	409	// error
	410	iLen = -1;
	411	}
	412	}
	413
	414	iRc = iLen;
	415	}
	416	#endif // VC++
	417
	418	if ( iRc == -1 ) {
	419	wxLogSysError(_("can't find length of file on file descriptor %d"), m_fd);
	420	return wxInvalidOffset;
	421	}
	422	else
	423	return (off_t)iRc;
	424	}
	425
	426	// is end of file reached?
	427	bool wxFile::Eof() const
	428	{
	429	wxASSERT( IsOpened() );
	430
	431	int iRc;
	432
	433	#if defined(__UNIX__) \|\| defined(__GNUWIN32__) \|\| defined( __MWERKS__ ) \|\| defined(__SALFORDC__)
	434	// @@ this doesn't work, of course, on unseekable file descriptors
	435	off_t ofsCur = Tell(),
	436	ofsMax = Length();
	437	if ( ofsCur == wxInvalidOffset \|\| ofsMax == wxInvalidOffset )
	438	iRc = -1;
	439	else
	440	iRc = ofsCur == ofsMax;
	441	#else // Windows and "native" compiler
	442	iRc = eof(m_fd);
	443	#endif // Windows/Unix
	444
	445	switch ( iRc ) {
	446	case 1:
	447	break;
	448
	449	case 0:
	450	return FALSE;
	451
	452	case -1:
	453	wxLogSysError(_("can't determine if the end of file is reached on \
	454	descriptor %d"), m_fd);
	455	break;
	456
	457	default:
	458	wxFAIL_MSG(_("invalid eof() return value."));
	459	}
	460
	461	return TRUE;
	462	}
	463
	464	// ============================================================================
	465	// implementation of wxTempFile
	466	// ============================================================================
	467
	468	// ----------------------------------------------------------------------------
	469	// construction
	470	// ----------------------------------------------------------------------------
	471	wxTempFile::wxTempFile(const wxString& strName)
	472	{
	473	Open(strName);
	474	}
	475
	476	bool wxTempFile::Open(const wxString& strName)
	477	{
	478	m_strName = strName;
	479
	480	// we want to create the file in the same directory as strName because
	481	// otherwise rename() in Commit() might not work (if the files are on
	482	// different partitions for example). Unfortunately, the only standard
	483	// (POSIX) temp file creation function tmpnam() can't do it.
	484	#if defined(__UNIX__) \|\| defined(__WXSTUBS__)\|\| defined( __WXMAC__ )
	485	static const wxChar *szMktempSuffix = _T("XXXXXX");
	486	m_strTemp << strName << szMktempSuffix;
	487	mktemp(MBSTRINGCAST m_strTemp.mb_str()); // will do because length doesn't change
	488	#else // Windows
	489	wxString strPath;
	490	wxSplitPath(strName, &strPath, NULL, NULL);
	491	if ( strPath.IsEmpty() )
	492	strPath = _T('.'); // GetTempFileName will fail if we give it empty string
	493	#ifdef __WIN32__
	494	if ( !GetTempFileName(strPath, _T("wx_"),0, m_strTemp.GetWriteBuf(MAX_PATH)) )
	495	#else
	496	// Not sure why MSVC++ 1.5 header defines first param as BYTE - bug?
	497	if ( !GetTempFileName((BYTE) (const wxChar*) strPath, _T("wx_"),0, m_strTemp.GetWriteBuf(MAX_PATH)) )
	498	#endif
	499	wxLogLastError(_T("GetTempFileName"));
	500	m_strTemp.UngetWriteBuf();
	501	#endif // Windows/Unix
	502
	503	int access = wxS_DEFAULT;
	504	#ifdef __UNIX__
	505	// create the file with the same mode as the original one under Unix
	506	mode_t umaskOld = 0; // just to suppress compiler warning
	507	bool changedUmask;
	508
	509	struct stat st;
	510	if ( stat(strName.fn_str(), &st) == 0 )
	511	{
	512	// this assumes that only lower bits of st_mode contain the access
	513	// rights, but it's true for at least all Unices which have S_IXXXX()
	514	// macros, so should not be less portable than using (not POSIX)
	515	// S_IFREG &c
	516	access = st.st_mode & 0777;
	517
	518	// we want to create the file with exactly the same access rights as
	519	// the original one, so disable the user's umask for the moment
	520	umaskOld = umask(0);
	521	changedUmask = TRUE;
	522	}
	523	else
	524	{
	525	// file probably didn't exist, just create with default mode _using_
	526	// user's umask (new files creation should respet umask)
	527	changedUmask = FALSE;
	528	}
	529	#endif // Unix
	530
	531	bool ok = m_file.Open(m_strTemp, wxFile::write, access);
	532
	533	#ifdef __UNIX__
	534	if ( changedUmask )
	535	{
	536	// restore umask now that the file is created
	537	(void)umask(umaskOld);
	538	}
	539	#endif // Unix
	540
	541	return ok;
	542	}
	543
	544	// ----------------------------------------------------------------------------
	545	// destruction
	546	// ----------------------------------------------------------------------------
	547
	548	wxTempFile::~wxTempFile()
	549	{
	550	if ( IsOpened() )
	551	Discard();
	552	}
	553
	554	bool wxTempFile::Commit()
	555	{
	556	m_file.Close();
	557
	558	if ( wxFile::Exists(m_strName) && remove(m_strName.fn_str()) != 0 ) {
	559	wxLogSysError(_("can't remove file '%s'"), m_strName.c_str());
	560	return FALSE;
	561	}
	562
	563	if ( rename(m_strTemp.fn_str(), m_strName.fn_str()) != 0 ) {
	564	wxLogSysError(_("can't commit changes to file '%s'"), m_strName.c_str());
	565	return FALSE;
	566	}
	567
	568	return TRUE;
	569	}
	570
	571	void wxTempFile::Discard()
	572	{
	573	m_file.Close();
	574	if ( remove(m_strTemp.fn_str()) != 0 )
	575	wxLogSysError(_("can't remove temporary file '%s'"), m_strTemp.c_str());
	576	}
	577
	578	#endif