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__) && !defined(__WXMICROWIN__)
  #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(__WXPM__))
    #include <io.h>
    #define   W_OK        2
    #define   R_OK        4
#elif (defined(__WXSTUBS__))
    // Have to ifdef this for different environments
    #include <io.h>
#elif (defined(__WXMAC__))
#if __MSL__ < 0x6000
    int access( const char *path, int mode ) { return 0 ; }
#else
    int _access( const char *path, int mode ) { return 0 ; }
#endif
    char* mktemp( char * path ) { return path ;}
    #include <stat.h>
    #define   W_OK        2
    #define   R_OK        4
    #include  <unistd.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

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

#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, so define
// O_BINARY as 0 if the system headers don't do it already
#if defined(__UNIX__) && !defined(O_BINARY)
    #define   O_BINARY    (0)
#endif  //__UNIX__

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

#ifndef MAX_PATH
    #define MAX_PATH 512
#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

// wxWindows
#include  "wx/string.h"
#include  "wx/intl.h"
#include  "wx/file.h"
#include  "wx/log.h"

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

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

    return !wxAccess(fname, 0) &&
           !wxStat(wxMBSTRINGCAST fname, &st) &&
           (st.st_mode & S_IFREG);

#else
    return !wxAccess(name, 0) &&
           !wxStat(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(wxT("bad wxFile::Access mode parameter."));
    }

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

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

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

    Open(szFileName, mode);
}

// 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
#if defined(__WXMAC__) && !defined(__UNIX__)
  // Dominic Mazzoni [dmazzoni+@cs.cmu.edu] reports that open is still broken on the mac, so we replace
  // int fd = open(wxUnix2MacFilename( szFileName ), O_CREAT | (bOverwrite ? O_TRUNC : O_EXCL), access);
  int fd = creat( szFileName , accessMode);
#else
    int fd = wxOpen(wxFNCONV(szFileName),
                    O_BINARY | O_WRONLY | O_CREAT |
                    (bOverwrite ? O_TRUNC : O_EXCL)
                    ACCESS(accessMode));
#endif
    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_append:
            if ( wxFile::Exists(szFileName) )
            {
                flags |= O_WRONLY | O_APPEND;
                break;
            }
            //else: fall through as write_append is the same as write if the
            //      file doesn't exist

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

        case read_write:
            flags |= O_RDWR;
            break;
    }

    int fd = wxOpen(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__
#if __MSL__ >= 0x6000
    int iRc = ::write(m_fd, (void*) pBuf, nCount);
#else
    int iRc = ::write(m_fd, (const char*) pBuf, nCount);
#endif
#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 ( wxFsync(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 origin;
    switch ( mode ) {
        default:
            wxFAIL_MSG(_("unknown seek origin"));

        case wxFromStart:
            origin = SEEK_SET;
            break;

        case wxFromCurrent:
            origin = SEEK_CUR;
            break;

        case wxFromEnd:
            origin = SEEK_END;
            break;
    }

    int iRc = lseek(m_fd, ofs, origin);
    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 = wxTell(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 = wxTell(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 = wxT("XXXXXX");
    m_strTemp << strName << szMktempSuffix;
    // can use the cast because length doesn't change
    mktemp(wxMBSTRINGCAST m_strTemp.mb_str());
#elif  defined(__WXPM__)
    // for now just create a file
    // future enhancements can be to set some extended attributes for file systems
    // OS/2 supports that have them (HPFS, FAT32) and security (HPFS386)
    static const wxChar *szMktempSuffix = wxT("XXX");
    m_strTemp << strName << szMktempSuffix;
    ::DosCreateDir(m_strTemp.GetWriteBuf(MAX_PATH), NULL);
#else // Windows
    wxString strPath;
    wxSplitPath(strName, &strPath, NULL, NULL);
    if ( strPath.IsEmpty() )
        strPath = wxT('.');  // GetTempFileName will fail if we give it empty string
#ifdef __WIN32__
    if ( !GetTempFileName(strPath, wxT("wx_"),0, m_strTemp.GetWriteBuf(MAX_PATH)) )
#else
        // Not sure why MSVC++ 1.5 header defines first param as BYTE - bug?
        if ( !GetTempFileName((BYTE) (DWORD)(const wxChar*) strPath, wxT("wx_"),0, m_strTemp.GetWriteBuf(MAX_PATH)) )
#endif
            wxLogLastError(wxT("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;

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

    if ( wxRename(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 ( wxRemove(m_strTemp) != 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__) && !defined(__WXMICROWIN__)
	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(__WXPM__))
	64	#include <io.h>
	65	#define W_OK 2
	66	#define R_OK 4
	67	#elif (defined(__WXSTUBS__))
	68	// Have to ifdef this for different environments
	69	#include <io.h>
	70	#elif (defined(__WXMAC__))
	71	#if __MSL__ < 0x6000
	72	int access( const char *path, int mode ) { return 0 ; }
	73	#else
	74	int _access( const char *path, int mode ) { return 0 ; }
	75	#endif
	76	char* mktemp( char * path ) { return path ;}
	77	#include <stat.h>
	78	#define W_OK 2
	79	#define R_OK 4
	80	#include <unistd.h>
	81	#else
	82	#error "Please specify the header with file functions declarations."
	83	#endif //Win/UNIX
	84
	85	#include <stdio.h> // SEEK_xxx constants
	86	#include <fcntl.h> // O_RDONLY &c
	87
	88	#ifndef __MWERKS__
	89	#include <sys/types.h> // needed for stat
	90	#include <sys/stat.h> // stat
	91	#endif
	92
	93	#if defined(__BORLANDC__) \|\| defined(_MSC_VER)
	94	#define W_OK 2
	95	#define R_OK 4
	96	#endif
	97
	98	// there is no distinction between text and binary files under Unix, so define
	99	// O_BINARY as 0 if the system headers don't do it already
	100	#if defined(__UNIX__) && !defined(O_BINARY)
	101	#define O_BINARY (0)
	102	#endif //__UNIX__
	103
	104	#ifdef __SALFORDC__
	105	#include <unix.h>
	106	#endif
	107
	108	#ifndef MAX_PATH
	109	#define MAX_PATH 512
	110	#endif
	111
	112	// some broken compilers don't have 3rd argument in open() and creat()
	113	#ifdef __SALFORDC__
	114	#define ACCESS(access)
	115	#define stat _stat
	116	#else // normal compiler
	117	#define ACCESS(access) , (access)
	118	#endif // Salford C
	119
	120	// wxWindows
	121	#include "wx/string.h"
	122	#include "wx/intl.h"
	123	#include "wx/file.h"
	124	#include "wx/log.h"
	125
	126	// ============================================================================
	127	// implementation of wxFile
	128	// ============================================================================
	129
	130	// ----------------------------------------------------------------------------
	131	// static functions
	132	// ----------------------------------------------------------------------------
	133	bool wxFile::Exists(const wxChar *name)
	134	{
	135	wxStructStat st;
	136	#if wxUSE_UNICODE && wxMBFILES
	137	wxCharBuffer fname = wxConvFile.cWC2MB(name);
	138
	139	return !wxAccess(fname, 0) &&
	140	!wxStat(wxMBSTRINGCAST fname, &st) &&
	141	(st.st_mode & S_IFREG);
	142
	143	#else
	144	return !wxAccess(name, 0) &&
	145	!wxStat(name, &st) &&
	146	(st.st_mode & S_IFREG);
	147	#endif
	148	}
	149
	150	bool wxFile::Access(const wxChar *name, OpenMode mode)
	151	{
	152	int how = 0;
	153
	154	switch ( mode ) {
	155	case read:
	156	how = R_OK;
	157	break;
	158
	159	case write:
	160	how = W_OK;
	161	break;
	162
	163	default:
	164	wxFAIL_MSG(wxT("bad wxFile::Access mode parameter."));
	165	}
	166
	167	return wxAccess(wxFNCONV(name), how) == 0;
	168	}
	169
	170	// ----------------------------------------------------------------------------
	171	// opening/closing
	172	// ----------------------------------------------------------------------------
	173
	174	// ctors
	175	wxFile::wxFile(const wxChar *szFileName, OpenMode mode)
	176	{
	177	m_fd = fd_invalid;
	178	m_error = FALSE;
	179
	180	Open(szFileName, mode);
	181	}
	182
	183	// create the file, fail if it already exists and bOverwrite
	184	bool wxFile::Create(const wxChar *szFileName, bool bOverwrite, int accessMode)
	185	{
	186	// if bOverwrite we create a new file or truncate the existing one,
	187	// otherwise we only create the new file and fail if it already exists
	188	#if defined(__WXMAC__) && !defined(__UNIX__)
	189	// Dominic Mazzoni [dmazzoni+@cs.cmu.edu] reports that open is still broken on the mac, so we replace
	190	// int fd = open(wxUnix2MacFilename( szFileName ), O_CREAT \| (bOverwrite ? O_TRUNC : O_EXCL), access);
	191	int fd = creat( szFileName , accessMode);
	192	#else
	193	int fd = wxOpen(wxFNCONV(szFileName),
	194	O_BINARY \| O_WRONLY \| O_CREAT \|
	195	(bOverwrite ? O_TRUNC : O_EXCL)
	196	ACCESS(accessMode));
	197	#endif
	198	if ( fd == -1 ) {
	199	wxLogSysError(_("can't create file '%s'"), szFileName);
	200	return FALSE;
	201	}
	202	else {
	203	Attach(fd);
	204	return TRUE;
	205	}
	206	}
	207
	208	// open the file
	209	bool wxFile::Open(const wxChar *szFileName, OpenMode mode, int accessMode)
	210	{
	211	int flags = O_BINARY;
	212
	213	switch ( mode ) {
	214	case read:
	215	flags \|= O_RDONLY;
	216	break;
	217
	218	case write_append:
	219	if ( wxFile::Exists(szFileName) )
	220	{
	221	flags \|= O_WRONLY \| O_APPEND;
	222	break;
	223	}
	224	//else: fall through as write_append is the same as write if the
	225	// file doesn't exist
	226
	227	case write:
	228	flags \|= O_WRONLY \| O_CREAT \| O_TRUNC;
	229	break;
	230
	231	case read_write:
	232	flags \|= O_RDWR;
	233	break;
	234	}
	235
	236	int fd = wxOpen(wxFNCONV(szFileName), flags ACCESS(accessMode));
	237	if ( fd == -1 ) {
	238	wxLogSysError(_("can't open file '%s'"), szFileName);
	239	return FALSE;
	240	}
	241	else {
	242	Attach(fd);
	243	return TRUE;
	244	}
	245	}
	246
	247	// close
	248	bool wxFile::Close()
	249	{
	250	if ( IsOpened() ) {
	251	if ( close(m_fd) == -1 ) {
	252	wxLogSysError(_("can't close file descriptor %d"), m_fd);
	253	m_fd = fd_invalid;
	254	return FALSE;
	255	}
	256	else
	257	m_fd = fd_invalid;
	258	}
	259
	260	return TRUE;
	261	}
	262
	263	// ----------------------------------------------------------------------------
	264	// read/write
	265	// ----------------------------------------------------------------------------
	266
	267	// read
	268	off_t wxFile::Read(void *pBuf, off_t nCount)
	269	{
	270	wxCHECK( (pBuf != NULL) && IsOpened(), 0 );
	271
	272	#ifdef __MWERKS__
	273	int iRc = ::read(m_fd, (char*) pBuf, nCount);
	274	#else
	275	int iRc = ::read(m_fd, pBuf, nCount);
	276	#endif
	277	if ( iRc == -1 ) {
	278	wxLogSysError(_("can't read from file descriptor %d"), m_fd);
	279	return wxInvalidOffset;
	280	}
	281	else
	282	return (size_t)iRc;
	283	}
	284
	285	// write
	286	size_t wxFile::Write(const void *pBuf, size_t nCount)
	287	{
	288	wxCHECK( (pBuf != NULL) && IsOpened(), 0 );
	289
	290	#ifdef __MWERKS__
	291	#if __MSL__ >= 0x6000
	292	int iRc = ::write(m_fd, (void*) pBuf, nCount);
	293	#else
	294	int iRc = ::write(m_fd, (const char*) pBuf, nCount);
	295	#endif
	296	#else
	297	int iRc = ::write(m_fd, pBuf, nCount);
	298	#endif
	299	if ( iRc == -1 ) {
	300	wxLogSysError(_("can't write to file descriptor %d"), m_fd);
	301	m_error = TRUE;
	302	return 0;
	303	}
	304	else
	305	return iRc;
	306	}
	307
	308	// flush
	309	bool wxFile::Flush()
	310	{
	311	if ( IsOpened() ) {
	312	#if defined(__VISUALC__) \|\| wxHAVE_FSYNC
	313	if ( wxFsync(m_fd) == -1 )
	314	{
	315	wxLogSysError(_("can't flush file descriptor %d"), m_fd);
	316	return FALSE;
	317	}
	318	#else // no fsync
	319	// just do nothing
	320	#endif // fsync
	321	}
	322
	323	return TRUE;
	324	}
	325
	326	// ----------------------------------------------------------------------------
	327	// seek
	328	// ----------------------------------------------------------------------------
	329
	330	// seek
	331	off_t wxFile::Seek(off_t ofs, wxSeekMode mode)
	332	{
	333	wxASSERT( IsOpened() );
	334
	335	int origin;
	336	switch ( mode ) {
	337	default:
	338	wxFAIL_MSG(_("unknown seek origin"));
	339
	340	case wxFromStart:
	341	origin = SEEK_SET;
	342	break;
	343
	344	case wxFromCurrent:
	345	origin = SEEK_CUR;
	346	break;
	347
	348	case wxFromEnd:
	349	origin = SEEK_END;
	350	break;
	351	}
	352
	353	int iRc = lseek(m_fd, ofs, origin);
	354	if ( iRc == -1 ) {
	355	wxLogSysError(_("can't seek on file descriptor %d"), m_fd);
	356	return wxInvalidOffset;
	357	}
	358	else
	359	return (off_t)iRc;
	360	}
	361
	362	// get current off_t
	363	off_t wxFile::Tell() const
	364	{
	365	wxASSERT( IsOpened() );
	366
	367	int iRc = wxTell(m_fd);
	368	if ( iRc == -1 ) {
	369	wxLogSysError(_("can't get seek position on file descriptor %d"), m_fd);
	370	return wxInvalidOffset;
	371	}
	372	else
	373	return (off_t)iRc;
	374	}
	375
	376	// get current file length
	377	off_t wxFile::Length() const
	378	{
	379	wxASSERT( IsOpened() );
	380
	381	#ifdef __VISUALC__
	382	int iRc = _filelength(m_fd);
	383	#else // !VC++
	384	int iRc = wxTell(m_fd);
	385	if ( iRc != -1 ) {
	386	// @ have to use const_cast :-(
	387	int iLen = ((wxFile *)this)->SeekEnd();
	388	if ( iLen != -1 ) {
	389	// restore old position
	390	if ( ((wxFile *)this)->Seek(iRc) == -1 ) {
	391	// error
	392	iLen = -1;
	393	}
	394	}
	395
	396	iRc = iLen;
	397	}
	398	#endif // VC++
	399
	400	if ( iRc == -1 ) {
	401	wxLogSysError(_("can't find length of file on file descriptor %d"), m_fd);
	402	return wxInvalidOffset;
	403	}
	404	else
	405	return (off_t)iRc;
	406	}
	407
	408	// is end of file reached?
	409	bool wxFile::Eof() const
	410	{
	411	wxASSERT( IsOpened() );
	412
	413	int iRc;
	414
	415	#if defined(__UNIX__) \|\| defined(__GNUWIN32__) \|\| defined( __MWERKS__ ) \|\| defined(__SALFORDC__)
	416	// @@ this doesn't work, of course, on unseekable file descriptors
	417	off_t ofsCur = Tell(),
	418	ofsMax = Length();
	419	if ( ofsCur == wxInvalidOffset \|\| ofsMax == wxInvalidOffset )
	420	iRc = -1;
	421	else
	422	iRc = ofsCur == ofsMax;
	423	#else // Windows and "native" compiler
	424	iRc = eof(m_fd);
	425	#endif // Windows/Unix
	426
	427	switch ( iRc ) {
	428	case 1:
	429	break;
	430
	431	case 0:
	432	return FALSE;
	433
	434	case -1:
	435	wxLogSysError(_("can't determine if the end of file is reached on descriptor %d"), m_fd);
	436	break;
	437
	438	default:
	439	wxFAIL_MSG(_("invalid eof() return value."));
	440	}
	441
	442	return TRUE;
	443	}
	444
	445	// ============================================================================
	446	// implementation of wxTempFile
	447	// ============================================================================
	448
	449	// ----------------------------------------------------------------------------
	450	// construction
	451	// ----------------------------------------------------------------------------
	452	wxTempFile::wxTempFile(const wxString& strName)
	453	{
	454	Open(strName);
	455	}
	456
	457	bool wxTempFile::Open(const wxString& strName)
	458	{
	459	m_strName = strName;
	460
	461	// we want to create the file in the same directory as strName because
	462	// otherwise rename() in Commit() might not work (if the files are on
	463	// different partitions for example). Unfortunately, the only standard
	464	// (POSIX) temp file creation function tmpnam() can't do it.
	465	#if defined(__UNIX__) \|\| defined(__WXSTUBS__)\|\| defined( __WXMAC__ )
	466	static const wxChar *szMktempSuffix = wxT("XXXXXX");
	467	m_strTemp << strName << szMktempSuffix;
	468	// can use the cast because length doesn't change
	469	mktemp(wxMBSTRINGCAST m_strTemp.mb_str());
	470	#elif defined(__WXPM__)
	471	// for now just create a file
	472	// future enhancements can be to set some extended attributes for file systems
	473	// OS/2 supports that have them (HPFS, FAT32) and security (HPFS386)
	474	static const wxChar *szMktempSuffix = wxT("XXX");
	475	m_strTemp << strName << szMktempSuffix;
	476	::DosCreateDir(m_strTemp.GetWriteBuf(MAX_PATH), NULL);
	477	#else // Windows
	478	wxString strPath;
	479	wxSplitPath(strName, &strPath, NULL, NULL);
	480	if ( strPath.IsEmpty() )
	481	strPath = wxT('.'); // GetTempFileName will fail if we give it empty string
	482	#ifdef __WIN32__
	483	if ( !GetTempFileName(strPath, wxT("wx_"),0, m_strTemp.GetWriteBuf(MAX_PATH)) )
	484	#else
	485	// Not sure why MSVC++ 1.5 header defines first param as BYTE - bug?
	486	if ( !GetTempFileName((BYTE) (DWORD)(const wxChar*) strPath, wxT("wx_"),0, m_strTemp.GetWriteBuf(MAX_PATH)) )
	487	#endif
	488	wxLogLastError(wxT("GetTempFileName"));
	489	m_strTemp.UngetWriteBuf();
	490	#endif // Windows/Unix
	491
	492	int access = wxS_DEFAULT;
	493	#ifdef __UNIX__
	494	// create the file with the same mode as the original one under Unix
	495	mode_t umaskOld = 0; // just to suppress compiler warning
	496	bool changedUmask;
	497
	498	wxStructStat st;
	499	if ( stat(strName.fn_str(), &st) == 0 )
	500	{
	501	// this assumes that only lower bits of st_mode contain the access
	502	// rights, but it's true for at least all Unices which have S_IXXXX()
	503	// macros, so should not be less portable than using (not POSIX)
	504	// S_IFREG &c
	505	access = st.st_mode & 0777;
	506
	507	// we want to create the file with exactly the same access rights as
	508	// the original one, so disable the user's umask for the moment
	509	umaskOld = umask(0);
	510	changedUmask = TRUE;
	511	}
	512	else
	513	{
	514	// file probably didn't exist, just create with default mode _using_
	515	// user's umask (new files creation should respet umask)
	516	changedUmask = FALSE;
	517	}
	518	#endif // Unix
	519
	520	bool ok = m_file.Open(m_strTemp, wxFile::write, access);
	521
	522	#ifdef __UNIX__
	523	if ( changedUmask )
	524	{
	525	// restore umask now that the file is created
	526	(void)umask(umaskOld);
	527	}
	528	#endif // Unix
	529
	530	return ok;
	531	}
	532
	533	// ----------------------------------------------------------------------------
	534	// destruction
	535	// ----------------------------------------------------------------------------
	536
	537	wxTempFile::~wxTempFile()
	538	{
	539	if ( IsOpened() )
	540	Discard();
	541	}
	542
	543	bool wxTempFile::Commit()
	544	{
	545	m_file.Close();
	546
	547	if ( wxFile::Exists(m_strName) && wxRemove(m_strName) != 0 ) {
	548	wxLogSysError(_("can't remove file '%s'"), m_strName.c_str());
	549	return FALSE;
	550	}
	551
	552	if ( wxRename(m_strTemp, m_strName) != 0 ) {
	553	wxLogSysError(_("can't commit changes to file '%s'"), m_strName.c_str());
	554	return FALSE;
	555	}
	556
	557	return TRUE;
	558	}
	559
	560	void wxTempFile::Discard()
	561	{
	562	m_file.Close();
	563	if ( wxRemove(m_strTemp) != 0 )
	564	wxLogSysError(_("can't remove temporary file '%s'"), m_strTemp.c_str());
	565	}
	566
	567	#endif
	568