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(__WXPM__))
    #include <io.h>
    #include <direct.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__))
    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(wxMBSTRINGCAST 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(wxT("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);
}

// 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 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 = 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 = 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;
    mkdir(m_strTemp.GetWriteBuf(MAX_PATH));
#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;

    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(__WXPM__))
	64	#include <io.h>
	65	#include <direct.h>
	66	#define W_OK 2
	67	#define R_OK 4
	68	#elif (defined(__WXSTUBS__))
	69	// Have to ifdef this for different environments
	70	#include <io.h>
	71	#elif (defined(__WXMAC__))
	72	int access( const char *path, int mode ) { return 0 ; }
	73	char* mktemp( char * path ) { return path ;}
	74	#include <unistd.h>
	75	#include <unix.h>
	76	#define W_OK 2
	77	#define R_OK 4
	78	#else
	79	#error "Please specify the header with file functions declarations."
	80	#endif //Win/UNIX
	81
	82	#include <stdio.h> // SEEK_xxx constants
	83	#include <fcntl.h> // O_RDONLY &c
	84
	85	#ifndef __MWERKS__
	86	#include <sys/types.h> // needed for stat
	87	#include <sys/stat.h> // stat
	88	#endif
	89
	90	// Microsoft compiler loves underscores, feed them to it
	91	#ifdef __VISUALC__
	92	// functions
	93	#define open _open
	94	#define close _close
	95	#define read _read
	96	#define write _write
	97	#define lseek _lseek
	98	#define fsync _commit
	99	#define access _access
	100	#define eof _eof
	101
	102	// types
	103	#define stat _stat
	104
	105	// constants
	106
	107	#define O_RDONLY _O_RDONLY
	108	#define O_WRONLY _O_WRONLY
	109	#define O_RDWR _O_RDWR
	110	#define O_EXCL _O_EXCL
	111	#define O_CREAT _O_CREAT
	112	#define O_BINARY _O_BINARY
	113
	114	#define S_IFDIR _S_IFDIR
	115	#define S_IFREG _S_IFREG
	116	#else
	117	#define tell(fd) lseek(fd, 0, SEEK_CUR)
	118	#endif // VC++
	119
	120	#if defined(__BORLANDC__) \|\| defined(_MSC_VER)
	121	#define W_OK 2
	122	#define R_OK 4
	123	#endif
	124
	125	// there is no distinction between text and binary files under Unix
	126	#ifdef __UNIX__
	127	#define O_BINARY (0)
	128	#endif //__UNIX__
	129
	130	#ifdef __SALFORDC__
	131	#include <unix.h>
	132	#endif
	133
	134	// wxWindows
	135	#include "wx/string.h"
	136	#include "wx/intl.h"
	137	#include "wx/file.h"
	138	#include "wx/log.h"
	139
	140	#ifndef MAX_PATH
	141	#define MAX_PATH 512
	142	#endif
	143
	144	#ifdef __WXMAC__
	145	char gwxMacFileName[ MAX_PATH ] ;
	146	char gwxMacFileName2[ MAX_PATH ] ;
	147	char gwxMacFileName3[ MAX_PATH ] ;
	148	#endif
	149
	150	// some broken compilers don't have 3rd argument in open() and creat()
	151	#ifdef __SALFORDC__
	152	#define ACCESS(access)
	153	#define stat _stat
	154	#else // normal compiler
	155	#define ACCESS(access) , (access)
	156	#endif // Salford C
	157
	158	// ============================================================================
	159	// implementation of wxFile
	160	// ============================================================================
	161
	162	// ----------------------------------------------------------------------------
	163	// static functions
	164	// ----------------------------------------------------------------------------
	165	bool wxFile::Exists(const wxChar *name)
	166	{
	167	struct stat st;
	168	#if wxUSE_UNICODE && wxMBFILES
	169	wxCharBuffer fname = wxConvFile.cWC2MB(name);
	170
	171	return !access(fname, 0) &&
	172	!stat(wxMBSTRINGCAST fname, &st) &&
	173	(st.st_mode & S_IFREG);
	174	#else
	175	return !access(name, 0) &&
	176	!stat((wxChar*) name, &st) &&
	177	(st.st_mode & S_IFREG);
	178	#endif
	179	}
	180
	181	bool wxFile::Access(const wxChar *name, OpenMode mode)
	182	{
	183	int how = 0;
	184
	185	switch ( mode ) {
	186	case read:
	187	how = R_OK;
	188	break;
	189
	190	case write:
	191	how = W_OK;
	192	break;
	193
	194	default:
	195	wxFAIL_MSG(wxT("bad wxFile::Access mode parameter."));
	196	}
	197
	198	return access(wxFNCONV(name), how) == 0;
	199	}
	200
	201	// ----------------------------------------------------------------------------
	202	// opening/closing
	203	// ----------------------------------------------------------------------------
	204
	205	// ctors
	206	wxFile::wxFile(const wxChar *szFileName, OpenMode mode)
	207	{
	208	m_fd = fd_invalid;
	209	m_error = FALSE;
	210
	211	Open(szFileName, mode);
	212	}
	213
	214	// create the file, fail if it already exists and bOverwrite
	215	bool wxFile::Create(const wxChar *szFileName, bool bOverwrite, int accessMode)
	216	{
	217	// if bOverwrite we create a new file or truncate the existing one,
	218	// otherwise we only create the new file and fail if it already exists
	219	int fd = open(wxFNCONV(szFileName),
	220	O_WRONLY \| O_CREAT \| (bOverwrite ? O_TRUNC : O_EXCL)
	221	ACCESS(accessMode));
	222
	223	if ( fd == -1 ) {
	224	wxLogSysError(_("can't create file '%s'"), szFileName);
	225	return FALSE;
	226	}
	227	else {
	228	Attach(fd);
	229	return TRUE;
	230	}
	231	}
	232
	233	// open the file
	234	bool wxFile::Open(const wxChar *szFileName, OpenMode mode, int accessMode)
	235	{
	236	int flags = O_BINARY;
	237
	238	switch ( mode ) {
	239	case read:
	240	flags \|= O_RDONLY;
	241	break;
	242
	243	case write:
	244	flags \|= O_WRONLY \| O_CREAT \| O_TRUNC;
	245	break;
	246
	247	case write_append:
	248	flags \|= O_WRONLY \| O_APPEND;
	249	break;
	250
	251	case read_write:
	252	flags \|= O_RDWR;
	253	break;
	254	}
	255
	256	int fd = open(wxFNCONV(szFileName), flags ACCESS(accessMode));
	257
	258	if ( fd == -1 ) {
	259	wxLogSysError(_("can't open file '%s'"), szFileName);
	260	return FALSE;
	261	}
	262	else {
	263	Attach(fd);
	264	return TRUE;
	265	}
	266	}
	267
	268	// close
	269	bool wxFile::Close()
	270	{
	271	if ( IsOpened() ) {
	272	if ( close(m_fd) == -1 ) {
	273	wxLogSysError(_("can't close file descriptor %d"), m_fd);
	274	m_fd = fd_invalid;
	275	return FALSE;
	276	}
	277	else
	278	m_fd = fd_invalid;
	279	}
	280
	281	return TRUE;
	282	}
	283
	284	// ----------------------------------------------------------------------------
	285	// read/write
	286	// ----------------------------------------------------------------------------
	287
	288	// read
	289	off_t wxFile::Read(void *pBuf, off_t nCount)
	290	{
	291	wxCHECK( (pBuf != NULL) && IsOpened(), 0 );
	292
	293	#ifdef __MWERKS__
	294	int iRc = ::read(m_fd, (char*) pBuf, nCount);
	295	#else
	296	int iRc = ::read(m_fd, pBuf, nCount);
	297	#endif
	298	if ( iRc == -1 ) {
	299	wxLogSysError(_("can't read from file descriptor %d"), m_fd);
	300	return wxInvalidOffset;
	301	}
	302	else
	303	return (size_t)iRc;
	304	}
	305
	306	// write
	307	size_t wxFile::Write(const void *pBuf, size_t nCount)
	308	{
	309	wxCHECK( (pBuf != NULL) && IsOpened(), 0 );
	310
	311	#ifdef __MWERKS__
	312	int iRc = ::write(m_fd, (const char*) pBuf, nCount);
	313	#else
	314	int iRc = ::write(m_fd, pBuf, nCount);
	315	#endif
	316	if ( iRc == -1 ) {
	317	wxLogSysError(_("can't write to file descriptor %d"), m_fd);
	318	m_error = TRUE;
	319	return 0;
	320	}
	321	else
	322	return iRc;
	323	}
	324
	325	// flush
	326	bool wxFile::Flush()
	327	{
	328	if ( IsOpened() ) {
	329	#if defined(__VISUALC__) \|\| wxHAVE_FSYNC
	330	if ( fsync(m_fd) == -1 )
	331	{
	332	wxLogSysError(_("can't flush file descriptor %d"), m_fd);
	333	return FALSE;
	334	}
	335	#else // no fsync
	336	// just do nothing
	337	#endif // fsync
	338	}
	339
	340	return TRUE;
	341	}
	342
	343	// ----------------------------------------------------------------------------
	344	// seek
	345	// ----------------------------------------------------------------------------
	346
	347	// seek
	348	off_t wxFile::Seek(off_t ofs, wxSeekMode mode)
	349	{
	350	wxASSERT( IsOpened() );
	351
	352	int origin;
	353	switch ( mode ) {
	354	default:
	355	wxFAIL_MSG(_("unknown seek origin"));
	356
	357	case wxFromStart:
	358	origin = SEEK_SET;
	359	break;
	360
	361	case wxFromCurrent:
	362	origin = SEEK_CUR;
	363	break;
	364
	365	case wxFromEnd:
	366	origin = SEEK_END;
	367	break;
	368	}
	369
	370	int iRc = lseek(m_fd, ofs, origin);
	371	if ( iRc == -1 ) {
	372	wxLogSysError(_("can't seek on file descriptor %d"), m_fd);
	373	return wxInvalidOffset;
	374	}
	375	else
	376	return (off_t)iRc;
	377	}
	378
	379	// get current off_t
	380	off_t wxFile::Tell() const
	381	{
	382	wxASSERT( IsOpened() );
	383
	384	int iRc = tell(m_fd);
	385	if ( iRc == -1 ) {
	386	wxLogSysError(_("can't get seek position on file descriptor %d"), m_fd);
	387	return wxInvalidOffset;
	388	}
	389	else
	390	return (off_t)iRc;
	391	}
	392
	393	// get current file length
	394	off_t wxFile::Length() const
	395	{
	396	wxASSERT( IsOpened() );
	397
	398	#ifdef __VISUALC__
	399	int iRc = _filelength(m_fd);
	400	#else // !VC++
	401	int iRc = tell(m_fd);
	402	if ( iRc != -1 ) {
	403	// @ have to use const_cast :-(
	404	int iLen = ((wxFile *)this)->SeekEnd();
	405	if ( iLen != -1 ) {
	406	// restore old position
	407	if ( ((wxFile *)this)->Seek(iRc) == -1 ) {
	408	// error
	409	iLen = -1;
	410	}
	411	}
	412
	413	iRc = iLen;
	414	}
	415	#endif // VC++
	416
	417	if ( iRc == -1 ) {
	418	wxLogSysError(_("can't find length of file on file descriptor %d"), m_fd);
	419	return wxInvalidOffset;
	420	}
	421	else
	422	return (off_t)iRc;
	423	}
	424
	425	// is end of file reached?
	426	bool wxFile::Eof() const
	427	{
	428	wxASSERT( IsOpened() );
	429
	430	int iRc;
	431
	432	#if defined(__UNIX__) \|\| defined(__GNUWIN32__) \|\| defined( __MWERKS__ ) \|\| defined(__SALFORDC__)
	433	// @@ this doesn't work, of course, on unseekable file descriptors
	434	off_t ofsCur = Tell(),
	435	ofsMax = Length();
	436	if ( ofsCur == wxInvalidOffset \|\| ofsMax == wxInvalidOffset )
	437	iRc = -1;
	438	else
	439	iRc = ofsCur == ofsMax;
	440	#else // Windows and "native" compiler
	441	iRc = eof(m_fd);
	442	#endif // Windows/Unix
	443
	444	switch ( iRc ) {
	445	case 1:
	446	break;
	447
	448	case 0:
	449	return FALSE;
	450
	451	case -1:
	452	wxLogSysError(_("can't determine if the end of file is reached on \
	453	descriptor %d"), m_fd);
	454	break;
	455
	456	default:
	457	wxFAIL_MSG(_("invalid eof() return value."));
	458	}
	459
	460	return TRUE;
	461	}
	462
	463	// ============================================================================
	464	// implementation of wxTempFile
	465	// ============================================================================
	466
	467	// ----------------------------------------------------------------------------
	468	// construction
	469	// ----------------------------------------------------------------------------
	470	wxTempFile::wxTempFile(const wxString& strName)
	471	{
	472	Open(strName);
	473	}
	474
	475	bool wxTempFile::Open(const wxString& strName)
	476	{
	477	m_strName = strName;
	478
	479	// we want to create the file in the same directory as strName because
	480	// otherwise rename() in Commit() might not work (if the files are on
	481	// different partitions for example). Unfortunately, the only standard
	482	// (POSIX) temp file creation function tmpnam() can't do it.
	483	#if defined(__UNIX__) \|\| defined(__WXSTUBS__)\|\| defined( __WXMAC__ )
	484	static const wxChar *szMktempSuffix = wxT("XXXXXX");
	485	m_strTemp << strName << szMktempSuffix;
	486	// can use the cast because length doesn't change
	487	mktemp(wxMBSTRINGCAST m_strTemp.mb_str());
	488	#elif defined(__WXPM__)
	489	// for now just create a file
	490	// future enhancements can be to set some extended attributes for file systems
	491	// OS/2 supports that have them (HPFS, FAT32) and security (HPFS386)
	492	static const wxChar *szMktempSuffix = wxT("XXX");
	493	m_strTemp << strName << szMktempSuffix;
	494	mkdir(m_strTemp.GetWriteBuf(MAX_PATH));
	495	#else // Windows
	496	wxString strPath;
	497	wxSplitPath(strName, &strPath, NULL, NULL);
	498	if ( strPath.IsEmpty() )
	499	strPath = wxT('.'); // GetTempFileName will fail if we give it empty string
	500	#ifdef __WIN32__
	501	if ( !GetTempFileName(strPath, wxT("wx_"),0, m_strTemp.GetWriteBuf(MAX_PATH)) )
	502	#else
	503	// Not sure why MSVC++ 1.5 header defines first param as BYTE - bug?
	504	if ( !GetTempFileName((BYTE) (DWORD)(const wxChar*) strPath, wxT("wx_"),0, m_strTemp.GetWriteBuf(MAX_PATH)) )
	505	#endif
	506	wxLogLastError(wxT("GetTempFileName"));
	507	m_strTemp.UngetWriteBuf();
	508	#endif // Windows/Unix
	509
	510	int access = wxS_DEFAULT;
	511	#ifdef __UNIX__
	512	// create the file with the same mode as the original one under Unix
	513	mode_t umaskOld = 0; // just to suppress compiler warning
	514	bool changedUmask;
	515
	516	struct stat st;
	517	if ( stat(strName.fn_str(), &st) == 0 )
	518	{
	519	// this assumes that only lower bits of st_mode contain the access
	520	// rights, but it's true for at least all Unices which have S_IXXXX()
	521	// macros, so should not be less portable than using (not POSIX)
	522	// S_IFREG &c
	523	access = st.st_mode & 0777;
	524
	525	// we want to create the file with exactly the same access rights as
	526	// the original one, so disable the user's umask for the moment
	527	umaskOld = umask(0);
	528	changedUmask = TRUE;
	529	}
	530	else
	531	{
	532	// file probably didn't exist, just create with default mode _using_
	533	// user's umask (new files creation should respet umask)
	534	changedUmask = FALSE;
	535	}
	536	#endif // Unix
	537
	538	bool ok = m_file.Open(m_strTemp, wxFile::write, access);
	539
	540	#ifdef __UNIX__
	541	if ( changedUmask )
	542	{
	543	// restore umask now that the file is created
	544	(void)umask(umaskOld);
	545	}
	546	#endif // Unix
	547
	548	return ok;
	549	}
	550
	551	// ----------------------------------------------------------------------------
	552	// destruction
	553	// ----------------------------------------------------------------------------
	554
	555	wxTempFile::~wxTempFile()
	556	{
	557	if ( IsOpened() )
	558	Discard();
	559	}
	560
	561	bool wxTempFile::Commit()
	562	{
	563	m_file.Close();
	564
	565	if ( wxFile::Exists(m_strName) && remove(m_strName.fn_str()) != 0 ) {
	566	wxLogSysError(_("can't remove file '%s'"), m_strName.c_str());
	567	return FALSE;
	568	}
	569
	570	if ( rename(m_strTemp.fn_str(), m_strName.fn_str()) != 0 ) {
	571	wxLogSysError(_("can't commit changes to file '%s'"), m_strName.c_str());
	572	return FALSE;
	573	}
	574
	575	return TRUE;
	576	}
	577
	578	void wxTempFile::Discard()
	579	{
	580	m_file.Close();
	581	if ( remove(m_strTemp.fn_str()) != 0 )
	582	wxLogSysError(_("can't remove temporary file '%s'"), m_strTemp.c_str());
	583	}
	584
	585	#endif
	586