Fix horizontal mouse wheel scrolling in wxGTK.

[wxWidgets.git] / src / common / file.cpp

diff --git a/src/common/file.cpp b/src/common/file.cpp
index 3d6fde63ea9dd6aa45a67038e8c6767362c012fc..b2a5aca73628991930426bde04c4384c0a1dc9f6 100644 (file)
--- a/src/common/file.cpp
+++ b/src/common/file.cpp
@@ -1,11 +1,10 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        file.cpp
+// Name:        src/common/file.cpp

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


@@ -14,10 +13,6 @@
 // headers
 // ----------------------------------------------------------------------------
 
 // headers
 // ----------------------------------------------------------------------------
 

-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-    #pragma implementation "file.h"
-#endif
-

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


@@ -28,34 +23,33 @@
 #if wxUSE_FILE
 
 // standard
 #if wxUSE_FILE
 
 // standard

-#if defined(__WXMSW__) && !defined(__GNUWIN32__) && !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
-  #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
-
-#elif defined(__WXMSW__) && defined(__WXWINCE__)
-    // TODO: what to include?
+#if defined(__WINDOWS__) && !defined(__GNUWIN32__) && !defined(__WXMICROWIN__) && !defined(__WXWINCE__)
+
+#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
+
+#elif defined(__WINDOWS__) && defined(__WXWINCE__)
+    #include  "wx/msw/missing.h"
+#elif (defined(__OS2__))
+    #include <io.h>

 #elif (defined(__UNIX__) || defined(__GNUWIN32__))
     #include  <unistd.h>
     #include  <time.h>
 #elif (defined(__UNIX__) || defined(__GNUWIN32__))
     #include  <unistd.h>
     #include  <time.h>


@@ -73,8 +67,6 @@
     #else
         #error  "Please specify the header with file functions declarations."
     #endif
     #else
         #error  "Please specify the header with file functions declarations."
     #endif

-#elif (defined(__WXPM__))
-    #include <io.h>

 #elif (defined(__WXSTUBS__))
     // Have to ifdef this for different environments
     #include <io.h>
 #elif (defined(__WXSTUBS__))
     // Have to ifdef this for different environments
     #include <io.h>


@@ -86,7 +78,7 @@
 #endif
     char* mktemp( char * path ) { return path ;}
     #include <stat.h>
 #endif
     char* mktemp( char * path ) { return path ;}
     #include <stat.h>

-    #include  <unistd.h>
+    #include <unistd.h>

 #else
     #error  "Please specify the header with file functions declarations."
 #endif  //Win/UNIX
 #else
     #error  "Please specify the header with file functions declarations."
 #endif  //Win/UNIX


@@ -94,17 +86,7 @@
 #include  <stdio.h>       // SEEK_xxx constants
 
 #ifndef __WXWINCE__
 #include  <stdio.h>       // SEEK_xxx constants
 
 #ifndef __WXWINCE__

-#include  <fcntl.h>       // O_RDONLY &c
-#endif
-
-#ifdef __WXWINCE__
-// Nothing
-#elif !defined(__MWERKS__)
-    #include  <sys/types.h>   // needed for stat
-    #include  <sys/stat.h>    // stat
-#elif defined(__MWERKS__) && ( defined(__WXMSW__) || defined(__MACH__) )
-    #include  <sys/types.h>   // needed for stat
-    #include  <sys/stat.h>    // stat
+    #include <errno.h>

 #endif
 
 // Windows compilers don't have these constants
 #endif
 
 // Windows compilers don't have these constants


@@ -118,40 +100,25 @@
     };
 #endif // W_OK
 
     };
 #endif // W_OK
 

-// 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
+// wxWidgets

 #ifndef WX_PRECOMP
     #include  "wx/string.h"
     #include  "wx/intl.h"
     #include  "wx/log.h"
 #ifndef WX_PRECOMP
     #include  "wx/string.h"
     #include  "wx/intl.h"
     #include  "wx/log.h"

+    #include "wx/crt.h"

 #endif // !WX_PRECOMP
 
 #include  "wx/filename.h"
 #include  "wx/file.h"
 #include  "wx/filefn.h"
 
 #endif // !WX_PRECOMP
 
 #include  "wx/filename.h"
 #include  "wx/file.h"
 #include  "wx/filefn.h"
 

-#ifdef __WXMSW__
+// 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 __WINDOWS__

     #include "wx/msw/mslu.h"
 #endif
 
     #include "wx/msw/mslu.h"
 #endif
 


@@ -159,6 +126,10 @@
     #include "wx/msw/private.h"
 #endif
 
     #include "wx/msw/private.h"
 #endif
 

+#ifndef MAX_PATH
+    #define MAX_PATH 512
+#endif
+

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


@@ -167,12 +138,12 @@
 // static functions
 // ----------------------------------------------------------------------------
 
 // static functions
 // ----------------------------------------------------------------------------
 

-bool wxFile::Exists(const wxChar *name)
+bool wxFile::Exists(const wxString& name)

 {
     return wxFileExists(name);
 }
 
 {
     return wxFileExists(name);
 }
 

-bool wxFile::Access(const wxChar *name, OpenMode mode)
+bool wxFile::Access(const wxString& name, OpenMode mode)

 {
     int how;
 
 {
     int how;
 


@@ -195,12 +166,7 @@ bool wxFile::Access(const wxChar *name, OpenMode mode)
             break;
     }
 
             break;
     }
 

-#ifdef __WXWINCE__
-    // FIXME: use CreateFile with 0 access to query the file
-    return TRUE;
-#else

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

-#endif

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------


@@ -208,108 +174,52 @@ bool wxFile::Access(const wxChar *name, OpenMode mode)
 // ----------------------------------------------------------------------------
 
 // ctors
 // ----------------------------------------------------------------------------
 
 // ctors

-wxFile::wxFile(const wxChar *szFileName, OpenMode mode)
+wxFile::wxFile(const wxString& fileName, OpenMode mode)

 {
     m_fd = fd_invalid;
 {
     m_fd = fd_invalid;

-    m_error = FALSE;
+    m_lasterror = 0;
+
+    Open(fileName, mode);
+}
+
+bool wxFile::CheckForError(wxFileOffset rc) const
+{
+    if ( rc != -1 )
+        return false;
+
+    const_cast<wxFile *>(this)->m_lasterror =
+#ifndef __WXWINCE__
+                                                errno
+#else
+                                                ::GetLastError()
+#endif
+                                                ;

 
 

-    Open(szFileName, mode);
+    return true;

 }
 
 // create the file, fail if it already exists and bOverwrite
 }
 
 // create the file, fail if it already exists and bOverwrite

-bool wxFile::Create(const wxChar *szFileName, bool bOverwrite, int accessMode)
+bool wxFile::Create(const wxString& fileName, 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 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__) && !wxUSE_UNICODE
-    // 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
-#ifdef __WXWINCE__
-    HANDLE fileHandle = ::CreateFile(szFileName, GENERIC_WRITE, 0, NULL,
-        bOverwrite ? CREATE_ALWAYS : CREATE_NEW, FILE_ATTRIBUTE_NORMAL,
-        0);
-    int fd = 0;
-    if (fileHandle == INVALID_HANDLE_VALUE)
-        fd = (int) fileHandle;
-    else
-        fd = -1;
-#else
-    int fd = wxOpen( szFileName,
+    int fildes = wxOpen( fileName,

                      O_BINARY | O_WRONLY | O_CREAT |
                      O_BINARY | O_WRONLY | O_CREAT |

-                     (bOverwrite ? O_TRUNC : O_EXCL)
-                     ACCESS(accessMode) );
-#endif
-#endif
-    if ( fd == -1 )
-    {
-        wxLogSysError(_("can't create file '%s'"), szFileName);
-        return FALSE;
-    }
-    else
+                     (bOverwrite ? O_TRUNC : O_EXCL),
+                     accessMode );
+    if ( CheckForError(fildes) )

     {
     {

-        Attach(fd);
-        return TRUE;
+        wxLogSysError(_("can't create file '%s'"), fileName);
+        return false;

     }
     }

+
+    Attach(fildes);
+    return true;

 }
 
 // open the file
 }
 
 // open the file

-bool wxFile::Open(const wxChar *szFileName, OpenMode mode, int accessMode)
+bool wxFile::Open(const wxString& fileName, OpenMode mode, int accessMode)

 {
 {

-#ifdef __WXWINCE__
-    DWORD access = 0;
-    DWORD shareMode = 0;
-    DWORD disposition = 0;
-
-    int flags = O_BINARY;
-
-    switch ( mode )
-    {
-        case read:
-            access = GENERIC_READ;
-            shareMode = FILE_SHARE_READ|FILE_SHARE_WRITE;
-            disposition = OPEN_EXISTING;
-            break;
-
-        case write_append:
-            if ( wxFile::Exists(szFileName) )
-            {
-                access = GENERIC_READ|GENERIC_WRITE;
-                shareMode = FILE_SHARE_READ;
-                disposition = 0;
-                break;
-            }
-            //else: fall through as write_append is the same as write if the
-            //      file doesn't exist
-
-        case write:
-            access = GENERIC_WRITE;
-            shareMode = 0;
-            disposition = TRUNCATE_EXISTING;
-            break;
-
-        case write_excl:
-            access = GENERIC_WRITE;
-            shareMode = 0;
-            disposition = TRUNCATE_EXISTING;
-            break;
-
-        case read_write:
-            access = GENERIC_READ|GENERIC_WRITE;
-            shareMode = 0;
-            disposition = 0;
-            break;
-    }
-
-    int fd = 0;
-    HANDLE fileHandle = ::CreateFile(szFileName, access, shareMode, NULL,
-        disposition, FILE_ATTRIBUTE_NORMAL, 0);
-    if (fileHandle == INVALID_HANDLE_VALUE)
-        fd = -1;
-    else
-        fd = (int) fileHandle;
-#else

     int flags = O_BINARY;
 
     switch ( mode )
     int flags = O_BINARY;
 
     switch ( mode )


@@ -319,7 +229,7 @@ bool wxFile::Open(const wxChar *szFileName, OpenMode mode, int accessMode)
             break;
 
         case write_append:
             break;
 
         case write_append:

-            if ( wxFile::Exists(szFileName) )
+            if ( wxFile::Exists(fileName) )

             {
                 flags |= O_WRONLY | O_APPEND;
                 break;
             {
                 flags |= O_WRONLY | O_APPEND;
                 break;


@@ -340,67 +250,92 @@ bool wxFile::Open(const wxChar *szFileName, OpenMode mode, int accessMode)
             break;
     }
 
             break;
     }
 

-    int fd = wxOpen( szFileName, flags ACCESS(accessMode));
-#endif
-    if ( fd == -1 )
+#ifdef __WINDOWS__
+    // only read/write bits for "all" are supported by this function under
+    // Windows, and VC++ 8 returns EINVAL if any other bits are used in
+    // accessMode, so clear them as they have at best no effect anyhow
+    accessMode &= wxS_IRUSR | wxS_IWUSR;
+#endif // __WINDOWS__
+
+    int fildes = wxOpen( fileName, flags, accessMode);
+
+    if ( CheckForError(fildes) )

     {
     {

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

     }
     }

+
+    Attach(fildes);
+    return true;

 }
 
 // close
 bool wxFile::Close()
 {
     if ( IsOpened() ) {
 }
 
 // close
 bool wxFile::Close()
 {
     if ( IsOpened() ) {

-#ifdef __WXWINCE__
-        if (!CloseHandle((HANDLE) m_fd))
-#else
-        if ( close(m_fd) == -1 )
-#endif
+        if ( CheckForError(wxClose(m_fd)) )

         {
             wxLogSysError(_("can't close file descriptor %d"), m_fd);
             m_fd = fd_invalid;
         {
             wxLogSysError(_("can't close file descriptor %d"), m_fd);
             m_fd = fd_invalid;

-            return FALSE;
+            return false;

         }
         else
             m_fd = fd_invalid;
     }
 
         }
         else
             m_fd = fd_invalid;
     }
 

-    return TRUE;
+    return true;

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

+bool wxFile::ReadAll(wxString *str, const wxMBConv& conv)
+{
+    wxCHECK_MSG( str, false, wxS("Output string must be non-NULL") );
+
+    ssize_t length = Length();
+    wxCHECK_MSG( (wxFileOffset)length == Length(), false, wxT("huge file not supported") );
+
+    wxCharBuffer buf(length);
+    char* p = buf.data();
+    for ( ;; )
+    {
+        static const ssize_t READSIZE = 4096;
+
+        ssize_t nread = Read(p, length > READSIZE ? READSIZE : length);
+        if ( nread == wxInvalidOffset )
+            return false;
+
+        p += nread;
+        if ( length <= nread )
+            break;
+
+        length -= nread;
+    }
+
+    *p = 0;
+
+    wxString strTmp(buf, conv);
+    str->swap(strTmp);
+
+    return true;
+}
+

 // read
 // read

-off_t wxFile::Read(void *pBuf, off_t nCount)
+ssize_t wxFile::Read(void *pBuf, size_t nCount)

 {
     wxCHECK( (pBuf != NULL) && IsOpened(), 0 );
 
 {
     wxCHECK( (pBuf != NULL) && IsOpened(), 0 );
 

-#ifdef __WXWINCE__
-    DWORD bytesRead = 0;
-    int iRc = 0;
-    if (ReadFile((HANDLE) m_fd, pBuf, (DWORD) nCount, & bytesRead, NULL))
-        iRc = bytesRead;
-    else
-        iRc = -1;
-#elif defined(__MWERKS__)
-    int iRc = ::read(m_fd, (char*) pBuf, nCount);
-#else
-    int iRc = ::read(m_fd, pBuf, nCount);
-#endif
-    if ( iRc == -1 ) {
+    ssize_t iRc = wxRead(m_fd, pBuf, nCount);
+
+    if ( CheckForError(iRc) )
+    {

         wxLogSysError(_("can't read from file descriptor %d"), m_fd);
         return wxInvalidOffset;
     }
         wxLogSysError(_("can't read from file descriptor %d"), m_fd);
         return wxInvalidOffset;
     }

-    else
-        return (size_t)iRc;
+
+    return iRc;

 }
 
 // write
 }
 
 // write


@@ -408,49 +343,49 @@ size_t wxFile::Write(const void *pBuf, size_t nCount)
 {
     wxCHECK( (pBuf != NULL) && IsOpened(), 0 );
 
 {
     wxCHECK( (pBuf != NULL) && IsOpened(), 0 );
 

-#ifdef __WXWINCE__
-    DWORD bytesRead = 0;
-    int iRc = 0;
-    if (WriteFile((HANDLE) m_fd, pBuf, (DWORD) nCount, & bytesRead, NULL))
-        iRc = bytesRead;
-    else
-        iRc = -1;
-#elif defined(__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 ) {
+    ssize_t iRc = wxWrite(m_fd, pBuf, nCount);
+
+    if ( CheckForError(iRc) )
+    {

         wxLogSysError(_("can't write to file descriptor %d"), m_fd);
         wxLogSysError(_("can't write to file descriptor %d"), m_fd);

-        m_error = TRUE;
-        return 0;
+        iRc = 0;

     }
     }

-    else
-        return iRc;
+
+    return iRc;
+}
+
+bool wxFile::Write(const wxString& s, const wxMBConv& conv)
+{
+  const wxWX2MBbuf buf = s.mb_str(conv);
+  if ( !buf )
+      return false;
+
+#if wxUSE_UNICODE
+  const size_t size = buf.length();
+#else
+  const size_t size = s.length();
+#endif
+
+  return Write(buf, size) == size;

 }
 
 // flush
 bool wxFile::Flush()
 {
 }
 
 // flush
 bool wxFile::Flush()
 {

-    if ( IsOpened() ) {
-#ifdef __WXWINCE__
-        // Do nothing
-#elif defined(__VISUALC__) || wxHAVE_FSYNC
-        if ( wxFsync(m_fd) == -1 )
+#ifdef HAVE_FSYNC
+    // fsync() only works on disk files and returns errors for pipes, don't
+    // call it then
+    if ( IsOpened() && GetKind() == wxFILE_KIND_DISK )
+    {
+        if ( CheckForError(wxFsync(m_fd)) )

         {
             wxLogSysError(_("can't flush file descriptor %d"), m_fd);
         {
             wxLogSysError(_("can't flush file descriptor %d"), m_fd);

-            return FALSE;
+            return false;

         }
         }

-#else // no fsync
-        // just do nothing
-#endif // fsync

     }
     }

+#endif // HAVE_FSYNC

 
 

-    return TRUE;
+    return true;

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------


@@ -458,42 +393,17 @@ bool wxFile::Flush()
 // ----------------------------------------------------------------------------
 
 // seek
 // ----------------------------------------------------------------------------
 
 // seek

-off_t wxFile::Seek(off_t ofs, wxSeekMode mode)
+wxFileOffset wxFile::Seek(wxFileOffset ofs, wxSeekMode mode)

 {
 {

-    wxASSERT( IsOpened() );
+    wxASSERT_MSG( IsOpened(), wxT("can't seek on closed file") );
+    wxCHECK_MSG( ofs != wxInvalidOffset || mode != wxFromStart,
+                 wxInvalidOffset,
+                 wxT("invalid absolute file offset") );

 
 

-#ifdef __WXWINCE__

     int origin;
     switch ( mode ) {
         default:
     int origin;
     switch ( mode ) {
         default:

-            wxFAIL_MSG(_("unknown seek origin"));
-
-        case wxFromStart:
-            origin = FILE_BEGIN;
-            break;
-
-        case wxFromCurrent:
-            origin = FILE_CURRENT;
-            break;
-
-        case wxFromEnd:
-            origin = FILE_END;
-            break;
-    }
-
-    DWORD res = SetFilePointer((HANDLE) m_fd, ofs, 0, origin) ;
-    if (res == 0xFFFFFFFF && GetLastError() != NO_ERROR)
-    {
-        wxLogSysError(_("can't seek on file descriptor %d"), m_fd);
-        return wxInvalidOffset;
-    }
-    else
-        return (off_t)res;
-#else
-    int origin;
-    switch ( mode ) {
-        default:
-            wxFAIL_MSG(_("unknown seek origin"));
+            wxFAIL_MSG(wxT("unknown seek origin"));

 
         case wxFromStart:
             origin = SEEK_SET;
 
         case wxFromStart:
             origin = SEEK_SET;


@@ -508,81 +418,70 @@ off_t wxFile::Seek(off_t ofs, wxSeekMode mode)
             break;
     }
 
             break;
     }
 

-    int iRc = lseek(m_fd, ofs, origin);
-    if ( iRc == -1 ) {
+    wxFileOffset iRc = wxSeek(m_fd, ofs, origin);
+    if ( CheckForError(iRc) )
+    {

         wxLogSysError(_("can't seek on file descriptor %d"), m_fd);
         wxLogSysError(_("can't seek on file descriptor %d"), m_fd);

-        return wxInvalidOffset;

     }
     }

-    else
-        return (off_t)iRc;
-#endif
+
+    return iRc;

 }
 
 }
 

-// get current off_t
-off_t wxFile::Tell() const
+// get current file offset
+wxFileOffset wxFile::Tell() const

 {
     wxASSERT( IsOpened() );
 
 {
     wxASSERT( IsOpened() );
 

-#ifdef __WXWINCE__
-    DWORD res = SetFilePointer((HANDLE) m_fd, 0, 0, FILE_CURRENT) ;
-    if (res == 0xFFFFFFFF && GetLastError() != NO_ERROR)
+    wxFileOffset iRc = wxTell(m_fd);
+    if ( CheckForError(iRc) )

     {
         wxLogSysError(_("can't get seek position on file descriptor %d"), m_fd);
     {
         wxLogSysError(_("can't get seek position on file descriptor %d"), m_fd);

-        return wxInvalidOffset;
-    }
-    else
-        return (off_t)res;
-#else
-    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;
-#endif
+
+    return iRc;

 }
 
 // get current file length
 }
 
 // get current file length

-off_t wxFile::Length() const
+wxFileOffset wxFile::Length() const

 {
     wxASSERT( IsOpened() );
 
 {
     wxASSERT( IsOpened() );
 

-#ifdef __WXWINCE__
-    DWORD off0 = SetFilePointer((HANDLE) m_fd, 0, 0, FILE_CURRENT);
-    DWORD off1 = SetFilePointer((HANDLE) m_fd, 0, 0, FILE_END);
-    off_t len = off1;
+    // we use a special method for Linux systems where files in sysfs (i.e.
+    // those under /sys typically) return length of 4096 bytes even when
+    // they're much smaller -- this is a problem as it results in errors later
+    // when we try reading 4KB from them
+#ifdef __LINUX__
+    struct stat st;
+    if ( fstat(m_fd, &st) == 0 )
+    {
+        // returning 0 for the special files indicates to the caller that they
+        // are not seekable
+        return st.st_blocks ? st.st_size : 0;
+    }
+    //else: failed to stat, try the normal method
+#endif // __LINUX__

 
 

-    // Restore position
-    SetFilePointer((HANDLE) m_fd, off0, 0, FILE_BEGIN);
-    return len;
-#else
-#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 ) {
+    wxFileOffset iRc = Tell();
+    if ( iRc != wxInvalidOffset ) {
+        wxFileOffset iLen = const_cast<wxFile *>(this)->SeekEnd();
+        if ( iLen != wxInvalidOffset ) {

             // restore old position
             // restore old position

-            if ( ((wxFile *)this)->Seek(iRc) == -1 ) {
+            if ( ((wxFile *)this)->Seek(iRc) == wxInvalidOffset ) {

                 // error
                 // error

-                iLen = -1;
+                iLen = wxInvalidOffset;

             }
         }
 
         iRc = iLen;
     }
             }
         }
 
         iRc = iLen;
     }

-#endif  // VC++

 
 

-    if ( iRc == -1 ) {
+    if ( iRc == wxInvalidOffset )
+    {
+        // last error was already set by Tell()

         wxLogSysError(_("can't find length of file on file descriptor %d"), m_fd);
         wxLogSysError(_("can't find length of file on file descriptor %d"), m_fd);

-        return wxInvalidOffset;

     }
     }

-    else
-        return (off_t)iRc;
-#endif
+
+    return iRc;

 }
 
 // is end of file reached?
 }
 
 // is end of file reached?


@@ -590,48 +489,29 @@ bool wxFile::Eof() const
 {
     wxASSERT( IsOpened() );
 
 {
     wxASSERT( IsOpened() );
 

-#ifdef __WXWINCE__
-    DWORD off0 = SetFilePointer((HANDLE) m_fd, 0, 0, FILE_CURRENT);
-    DWORD off1 = SetFilePointer((HANDLE) m_fd, 0, 0, FILE_END);
-    if (off0 == off1)
-        return TRUE;
-    else
-    {
-        SetFilePointer((HANDLE) m_fd, off0, 0, FILE_BEGIN);
-        return FALSE;
-    }
-#else
-    int iRc;
+    wxFileOffset iRc;

 
 

-#if defined(__DOS__) || defined(__UNIX__) || defined(__GNUWIN32__) || defined( __MWERKS__ ) || defined(__SALFORDC__)
+#if defined(__DOS__) || defined(__UNIX__) || defined(__GNUWIN32__)

     // @@ this doesn't work, of course, on unseekable file descriptors
     // @@ this doesn't work, of course, on unseekable file descriptors

-    off_t ofsCur = Tell(),
+    wxFileOffset ofsCur = Tell(),

     ofsMax = Length();
     if ( ofsCur == wxInvalidOffset || ofsMax == wxInvalidOffset )
     ofsMax = Length();
     if ( ofsCur == wxInvalidOffset || ofsMax == wxInvalidOffset )

-        iRc = -1;
+        iRc = wxInvalidOffset;

     else
         iRc = ofsCur == ofsMax;
 #else  // Windows and "native" compiler
     else
         iRc = ofsCur == ofsMax;
 #else  // Windows and "native" compiler

-    iRc = eof(m_fd);
+    iRc = wxEof(m_fd);

 #endif // Windows/Unix
 
 #endif // Windows/Unix
 

-    switch ( iRc ) {
-        case 1:
-            break;
-
-        case 0:
-            return FALSE;
+    if ( iRc == 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."));
+    if ( iRc == wxInvalidOffset )
+    {
+        wxLogSysError(_("can't determine if the end of file is reached on descriptor %d"), m_fd);

     }
 
     }
 

-    return TRUE;
-#endif
+    return true;

 }
 
 // ============================================================================
 }
 
 // ============================================================================


@@ -669,13 +549,13 @@ bool wxTempFile::Open(const wxString& strName)
     if ( m_strTemp.empty() )
     {
         // CreateTempFileName() failed
     if ( m_strTemp.empty() )
     {
         // CreateTempFileName() failed

-        return FALSE;
+        return false;

     }
 
 #ifdef __UNIX__
     // the temp file should have the same permissions as the original one
     mode_t mode;
     }
 
 #ifdef __UNIX__
     // the temp file should have the same permissions as the original one
     mode_t mode;

-    
+

     wxStructStat st;
     if ( stat( (const char*) m_strName.fn_str(), &st) == 0 )
     {
     wxStructStat st;
     if ( stat( (const char*) m_strName.fn_str(), &st) == 0 )
     {


@@ -692,11 +572,13 @@ bool wxTempFile::Open(const wxString& strName)
 
     if ( chmod( (const char*) m_strTemp.fn_str(), mode) == -1 )
     {
 
     if ( chmod( (const char*) m_strTemp.fn_str(), mode) == -1 )
     {

+#ifndef __OS2__

         wxLogSysError(_("Failed to set temporary file permissions"));
         wxLogSysError(_("Failed to set temporary file permissions"));

+#endif

     }
 #endif // Unix
 
     }
 #endif // Unix
 

-    return TRUE;
+    return true;

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------


@@ -715,22 +597,24 @@ bool wxTempFile::Commit()
 
     if ( wxFile::Exists(m_strName) && wxRemove(m_strName) != 0 ) {
         wxLogSysError(_("can't remove file '%s'"), m_strName.c_str());
 
     if ( wxFile::Exists(m_strName) && wxRemove(m_strName) != 0 ) {
         wxLogSysError(_("can't remove file '%s'"), m_strName.c_str());

-        return FALSE;
+        return false;

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

-        return FALSE;
+        return false;

     }
 
     }
 

-    return TRUE;
+    return true;

 }
 
 void wxTempFile::Discard()
 {
     m_file.Close();
     if ( wxRemove(m_strTemp) != 0 )
 }
 
 void wxTempFile::Discard()
 {
     m_file.Close();
     if ( wxRemove(m_strTemp) != 0 )

+    {

         wxLogSysError(_("can't remove temporary file '%s'"), m_strTemp.c_str());
         wxLogSysError(_("can't remove temporary file '%s'"), m_strTemp.c_str());

+    }

 }
 
 #endif // wxUSE_FILE
 }
 
 #endif // wxUSE_FILE