/*

  * Portions Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.

  *

  * Copyright (c) 1999

  * Silicon Graphics Computer Systems, Inc.

  *

  * Copyright (c) 1999

  * Boris Fomitchev

  *

  * This material is provided "as is", with absolutely no warranty expressed

  * or implied. Any use is at your own risk.

  *

  * Permission to use or copy this software for any purpose is hereby granted

  * without fee, provided the above notices are retained on all copies.

  * Permission to modify the code and to distribute modified code is granted,

  * provided the above notices are retained, and a notice that the code was

  * modified is included with the above copyright notice.

  *

  */

 #include "stlport_prefix.h"

 #if defined  (__SUNPPRO_CC)  && !defined (_STLP_NO_NEW_C_HEADERS)

 #  include <time.h>

 // For sunpro, it chokes if time.h is included through stat.h

 #endif

 #include <fstream>

 #ifdef __CYGWIN__

 #  define __int64 long long

 #endif

 #if defined (_STLP_USE_UNIX_IO)

 extern "C" {

 // open/close/read/write

 #  include <sys/stat.h>           // For stat

 #  if !defined (_CRAY) && ! defined (__EMX__)

 #    include <sys/mman.h>           // For mmap

 #  endif

 //  on HP-UX 11, this one contradicts with pthread.h on pthread_atfork, unless we unset this

 #  if defined (__hpux) && defined (__GNUC__)

 #    undef _INCLUDE_POSIX1C_SOURCE

 #  endif

 #  include <unistd.h>

 #  include <fcntl.h>

 }

 #  ifdef __APPLE__

 #    include <sys/sysctl.h>

 #  endif

 #elif defined (_STLP_USE_WIN32_IO)

 #  define WIN32_LEAN_AND_MEAN

 #  include <windows.h>

 #  ifdef __BORLANDC__

 #      include <cfcntl.h>            // For _O_RDONLY, etc

 #    include <sys/stat.h>         // For _fstat

 #  elif !defined(_STLP_WCE)

 #    include <io.h>               // For _get_osfhandle

 #    include <fcntl.h>            // For _O_RDONLY, etc

 #    include <sys/stat.h>         // For _fstat

 #  endif

 #  define _TEXTBUF_SIZE 0x1000

 #elif defined (_STLP_USE_UNIX_EMULATION_IO)

 #  if defined( __MSL__ )

 #    include <unistd.h>

 #  else

 #    include <io.h>

 #  endif

 #  include <fcntl.h>

 #  include <sys/stat.h>

 #elif defined (_STLP_USE_STDIO_IO)

 #  include <cstdio>

 #  if !(defined(__MRC__) || defined(__SC__) || defined(__ISCPP__) )

 extern "C" {

 #    include <sys/stat.h>

 }

 #  endif

 #  if defined( __MSL__ )

 #    include <unix.h>

 #  endif

 #  if defined(__ISCPP__)

 #    include <c_locale_is/filestat.h>

 #  endif

 #  if (defined(__BEOS__) && defined(__INTEL__)) || defined (__SYMBIAN32__)

 #    include <fcntl.h>

 #    include <sys/stat.h>         // For _fstat

 #    define _S_IREAD S_IREAD

 #    define _S_IWRITE S_IWRITE

 #    define _S_IFREG S_IFREG

 #  endif

 #else

 #  error "Configure i/o !"

 #endif

 #if defined (_STLP_USE_WIN32_IO)

 const _STLP_fd INVALID_STLP_FD = INVALID_HANDLE_VALUE;

 #  if !defined (INVALID_SET_FILE_POINTER)

 #    define INVALID_SET_FILE_POINTER 0xffffffff

 #  endif

 #elif defined (_STLP_USE_UNIX_EMULATION_IO) || defined (_STLP_USE_STDIO_IO) || defined (_STLP_USE_UNIX_IO)

 const _STLP_fd INVALID_STLP_FD = -1;

 #else

 #  error "Configure i/o !"

 #endif

 // map permission masks

 #if defined (_STLP_USE_UNIX_EMULATION_IO) || defined (_STLP_USE_STDIO_IO)

 #  ifndef S_IRUSR

 #    define S_IRUSR _S_IREAD

 #    define S_IWUSR _S_IWRITE

 #    define S_IRGRP _S_IREAD

 #    define S_IWGRP _S_IWRITE

 #    define S_IROTH _S_IREAD

 #    define S_IWOTH _S_IWRITE

 #  endif

 #  ifndef O_RDONLY

 #    define O_RDONLY _O_RDONLY

 #    define O_WRONLY _O_WRONLY

 #    define O_RDWR   _O_RDWR

 #    define O_APPEND _O_APPEND

 #    define O_CREAT  _O_CREAT

 #    define O_TRUNC  _O_TRUNC

 #    define O_TEXT   _O_TEXT

 #    define O_BINARY _O_BINARY

 #  endif

 #  ifdef __MSL__

 #    define _O_TEXT 0x0

 #    if !defined( O_TEXT )

 #      define O_TEXT _O_TEXT

 #    endif

 #    define _S_IFREG S_IFREG

 #    define S_IREAD        S_IRUSR

 #    define S_IWRITE       S_IWUSR

 #    define S_IEXEC        S_IXUSR

 #    define _S_IWRITE S_IWRITE

 #    define _S_IREAD S_IREAD

 #    define _open open

 #    define _lseek lseek

 #    define _close close

 #    define _read read

 #    define _write write

 #  endif

 #endif

 #ifndef O_ACCMODE

 #  define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR)

 #endif

 #include "fstream_impl.h"

 #ifdef _STLP_LONG_LONG

 #  define ULL(x) ((unsigned _STLP_LONG_LONG)x)

 #elif defined(__MRC__) || defined(__SC__)    //*TY 02/25/2000 - added support for MPW compilers

 #  include <Math64.h>

 #  define ULL(x) (U64SetU(x))

 #elif defined(__ISCPP__)

 #  include "uint64.h"

 #elif defined(__SYMBIAN32__)

 #  include <sys/types.h>

 #else

 #  error "there should be some long long type on the system!"

 #endif

 #if defined(__SYMBIAN32__WSD__) 

 # include "libstdcppwsd.h"

 _STLP_DECLSPEC size_t& get_fstream_Filebuf_Base_GetPageSize()

 {

 	return get_libcpp_wsd().fstream_Filebuf_base_M_page_size;

 }

 void filebuf_page_size_init()

 {

 	get_fstream_Filebuf_Base_GetPageSize() = 4096;	

 }

 #endif

 _STLP_BEGIN_NAMESPACE

 // Compare with streamoff definition in stl/char_traits.h!

 #ifdef _STLP_USE_DEFAULT_FILE_OFFSET

 #  define FOPEN fopen

 #  define FSEEK fseek

 #  define FSTAT fstat

 #  define STAT  stat

 #  define FTELL ftell

 #  define LSEEK lseek

 #  define MMAP  mmap

 #  define OPEN  open

 #elif defined(_LARGEFILE_SOURCE) || defined(_LARGEFILE64_SOURCE) /* || defined(__USE_FILE_OFFSET64) */ \

       /* || (defined(_FILE_OFFSET_BITS) && (_FILE_OFFSET_BITS == 64)) */ /* || defined(__sgi) */

 #  define FOPEN fopen64

 #  define FSEEK fseeko64

 #  define FSTAT fstat64

 #  define STAT  stat64

 #  define FTELL ftello64

 #  define LSEEK lseek64

 #  define MMAP  mmap64

 #  define OPEN  open64

 #else

 #  define OPEN  open

 #  define FSEEK fseek

 #  define FSTAT fstat

 #  define STAT  stat

 #  define FTELL ftell

 #  define LSEEK lseek

 #  define MMAP  mmap

 #  define OPEN  open

 #endif

 #ifdef _STLP_USE_UNIX_IO

 #  ifndef MAP_FAILED /* MMAP failure return code */

 #    define MAP_FAILED -1

 #  endif

 #elif defined (_STLP_USE_UNIX_EMULATION_IO)

 #  define LSEEK _lseek

 #endif

 #if !defined(__MSL__) && !defined(__MRC__) && !defined(__SC__) && !defined(_STLP_WCE)    //*TY 04/15/2000 - exclude mpw compilers also

 static ios_base::openmode flag_to_openmode(int mode) {

   ios_base::openmode ret = ios_base::__default_mode;

   switch(mode & O_ACCMODE) {

   case O_RDONLY:

     ret = ios_base::in; break;

   case O_WRONLY:

     ret = ios_base::out; break;

   case O_RDWR:

     ret = ios_base::in | ios_base::out; break;

   }

   if (mode & O_APPEND)

     ret |= ios_base::app;

 #  if defined (_STLP_USE_WIN32_IO)

   if (mode & O_BINARY)

     ret |= ios_base::binary;

 #  endif

   return ret;

 }

 #endif /* MSL */

 _STLP_MOVE_TO_PRIV_NAMESPACE

 // Helper functions for _Filebuf_base.

 bool __is_regular_file(_STLP_fd fd) {

 #if defined (_STLP_UNIX)

   struct STAT buf;

   return FSTAT(fd, &buf) == 0 && S_ISREG(buf.st_mode);

 #elif defined(__MRC__) || defined(__SC__)    //*TY 02/25/2000 - added support for MPW compilers

 #  pragma unused(fd)

   return true;  // each file is a regular file under mac os, isn't it? (we don't have fstat())

 #elif defined(_STLP_USE_UNIX_EMULATION_IO) || defined (_STLP_USE_STDIO_IO)

   struct STAT buf;

   return FSTAT(fd, &buf) == 0 && (buf.st_mode & _S_IFREG) != 0 ;

 #elif defined (_STLP_USE_WIN32_IO) && !defined(_STLP_WCE)

   return (GetFileType(fd) & ~FILE_TYPE_REMOTE) == FILE_TYPE_DISK;

 #else

   (void)fd;    // dwa 4/27/00 - suppress unused parameter warning

   return false;

 #endif

 }

 // Number of characters in the file.

 streamoff __file_size(_STLP_fd fd) {

   streamoff ret = 0;

 #if defined (_STLP_UNIX)

   struct STAT buf;

   if (FSTAT(fd, &buf) == 0 && S_ISREG(buf.st_mode))

     ret = buf.st_size > 0 ? buf.st_size : 0;

 #elif defined(__MRC__) || defined(__SC__)    //*TY 02/25/2000 - added support for MPW compilers

 #  pragma unused(fd)

 #elif defined(_STLP_USE_UNIX_EMULATION_IO) || defined (_STLP_USE_STDIO_IO)

   struct STAT buf;

   if (FSTAT(fd, &buf) == 0 && (buf.st_mode & _S_IFREG) != 0)

     ret = buf.st_size > 0 ? buf.st_size : 0;

 #elif defined (_STLP_USE_WIN32_IO)

  LARGE_INTEGER li;

  li.LowPart = GetFileSize(fd, (unsigned long*) &li.HighPart);

  if (li.LowPart != INVALID_FILE_SIZE || GetLastError() == NO_ERROR)

    ret = li.QuadPart;

 #else

   (void)fd;    // dwa 4/27/00 - suppress unused parameter warning

 #endif

   return ret;

 }

 _STLP_MOVE_TO_STD_NAMESPACE

 // Visual C++ and Intel use this, but not Metrowerks

 // Also MinGW, msvcrt.dll (but not crtdll.dll) dependent version

 #if (!defined (__MSL__) && !defined (_STLP_WCE) && defined (_STLP_MSVC_LIB) && defined (_WIN32)) || \

     (defined (__MINGW32__) && defined (__MSVCRT__) && !(defined (__SYMBIAN32__) && defined(__GCCXML__)) )

 // fcntl(fileno, F_GETFL) for Microsoft library

 // 'semi-documented' defines:

 #  define IOINFO_L2E          5

 #  define IOINFO_ARRAY_ELTS   (1 << IOINFO_L2E)

 #  define _pioinfo(i) ( __pioinfo[(i) >> IOINFO_L2E] + \

               ((i) & (IOINFO_ARRAY_ELTS - 1)) )

 #  define FAPPEND         0x20    // O_APPEND flag

 #  define FTEXT           0x80    // O_TEXT flag

 // end of 'semi-documented' defines

 // 'semi-documented' internal structure

 extern "C" {

   struct ioinfo {

     long osfhnd;    // the real os HANDLE

     char osfile;    // file handle flags

     char pipech;    // pipe buffer

 #  if defined (_MT)

     // multi-threaded locking

     int lockinitflag;

     CRITICAL_SECTION lock;

 #  endif  /* _MT */

   };

 #  if defined (__MINGW32__)

  __MINGW_IMPORT ioinfo * __pioinfo[];

 #  else

   extern _CRTIMP ioinfo * __pioinfo[];

 #  endif

 } // extern "C"

 // end of 'semi-documented' declarations

 static ios_base::openmode _get_osfflags(int fd, HANDLE oshandle) {

   char dosflags = 0;

   if (fd >= 0)

     dosflags = _pioinfo(fd)->osfile;

   //else

     //the file will be considered as open in binary mode with no append attribute

   // end of 'semi-documented' stuff

   int mode = 0;

   if (dosflags & FAPPEND)

     mode |= O_APPEND;

   if (dosflags & FTEXT)

     mode |= O_TEXT;

   else

     mode |= O_BINARY;

   // For Read/Write access we have to guess

   DWORD dummy, dummy2;

   BOOL writeOk = WriteFile(oshandle, &dummy2, 0, &dummy, 0);

   BOOL readOk = ReadFile(oshandle, &dummy2, 0, &dummy, NULL);

   if (writeOk && readOk)

     mode |= O_RDWR;

   else if (readOk)

     mode |= O_RDONLY;

   else

     mode |= O_WRONLY;

   return flag_to_openmode(mode);

 }

 #elif defined (__DMC__)

 #  define FHND_APPEND 0x04

 #  define FHND_DEVICE 0x08

 #  define FHND_TEXT   0x10

 extern "C" unsigned char __fhnd_info[_NFILE];

 static ios_base::openmode _get_osfflags(int fd, HANDLE oshandle) {

   int mode = 0;

   if (__fhnd_info[fd] & FHND_APPEND)

     mode |= O_APPEND;

   if (__fhnd_info[fd] & FHND_TEXT == 0)

     mode |= O_BINARY;

   for (FILE *fp = &_iob[0]; fp < &_iob[_NFILE]; fp++) {

     if ((fileno(fp) == fd) && (fp->_flag & (_IOREAD | _IOWRT | _IORW))) {

       const int osflags = fp->_flag;

       if ((osflags & _IOREAD) && !(osflags & _IOWRT) && !(osflags & _IORW))

         mode |= O_RDONLY;

       else if ((osflags & _IOWRT) && !(osflags & _IOREAD) && !(osflags & _IORW))

         mode |= O_WRONLY;

       else

         mode |= O_RDWR;

       break;

     }

   }

   return flag_to_openmode(mode);

 }

 #endif

 #if !defined(__SYMBIAN32__WSD__)

 size_t _Filebuf_base::_M_page_size = 4096;

 #endif //__SYMBIAN32__WSD__

 _STLP_DECLSPEC _Filebuf_base::_Filebuf_base()

   : _M_file_id(INVALID_STLP_FD),

 #if defined (_STLP_USE_WIN32_IO)

     _M_view_id(0),

 #endif

     _M_openmode(0),

     _M_is_open(false),

     _M_should_close(false)

 {}

 void _Filebuf_base::_S_initialize() {

 #if defined (_STLP_UNIX)  && !defined (__DJGPP) && !defined (_CRAY)

 #  if defined (__APPLE__)

   int mib[2];

   size_t pagesize, len;

   mib[0] = CTL_HW;

   mib[1] = HW_PAGESIZE;

   len = sizeof(pagesize);

   sysctl(mib, 2, &pagesize, &len, NULL, 0);

   _M_page_size = pagesize;

 #  elif defined (__DJGPP) && defined (_CRAY)

   _M_page_size = BUFSIZ;

 #  else

   _M_page_size = sysconf(_SC_PAGESIZE);

 #  endif

 #elif defined (_STLP_USE_WIN32_IO)

   SYSTEM_INFO SystemInfo;

   GetSystemInfo(&SystemInfo);

   _M_page_size = SystemInfo.dwPageSize;

   // might be .dwAllocationGranularity

 #endif

 }

 // Return the size of the file.  This is a wrapper for stat.

 // Returns zero if the size cannot be determined or is ill-defined.

 _STLP_DECLSPEC streamoff _Filebuf_base::_M_file_size() {

   return _STLP_PRIV __file_size(_M_file_id);

 }

 _STLP_DECLSPEC bool _Filebuf_base::_M_open(const char* name, ios_base::openmode openmode,

                             long permission) {

   _STLP_fd file_no;

   if (_M_is_open)

     return false;

 #if defined (_STLP_USE_UNIX_IO) || defined (_STLP_USE_UNIX_EMULATION_IO)

   int flags = 0;

   // Unix makes no distinction between text and binary files.

   switch(openmode & (~ios_base::ate & ~ios_base::binary)) {

   case ios_base::out:

   case ios_base::out | ios_base::trunc:

     flags = O_WRONLY | O_CREAT | O_TRUNC;

     break;

   case ios_base::out | ios_base::app:

     flags = O_WRONLY | O_CREAT | O_APPEND;

     break;

   case ios_base::in:

     flags = O_RDONLY;

     permission = 0;             // Irrelevant unless we're writing.

     break;

   case ios_base::in | ios_base::out:

     flags = O_RDWR;

     break;

   case ios_base::in | ios_base::out | ios_base::trunc:

     flags = O_RDWR | O_CREAT | O_TRUNC;

     break;

   default:                      // The above are the only combinations of

     return false;               // flags allowed by the C++ standard.

   }

 #  if defined (_STLP_USE_UNIX_EMULATION_IO)

   if (openmode & ios_base::binary)

     flags |= O_BINARY;

   else

     flags |= O_TEXT;

   file_no = _open(name, flags, permission);

 #  else

   file_no = OPEN(name, flags, permission);

 #  endif /* _STLP_USE_UNIX_EMULATION_IO */

   if (file_no < 0)

     return false;

   _M_is_open = true;

   if (openmode & ios_base::ate)

     if (LSEEK(file_no, 0, SEEK_END) == -1)

       _M_is_open = false;

 #elif defined (_STLP_USE_STDIO_IO)

   // use FILE-based i/o

   const char* flags;

   switch(openmode & (~ios_base::ate)) {

   case ios_base::out:

   case ios_base::out | ios_base::trunc:

     flags = "w";

     break;

   case ios_base::out | ios_base::binary:

   case ios_base::out | ios_base::trunc | ios_base::binary:

     flags = "wb";

     break;

   case ios_base::out | ios_base::app:

     flags = "a";

     break;

   case ios_base::out | ios_base::app | ios_base::binary:

     flags = "ab";

     break;

   case ios_base::in:

     flags = "r";

     break;

   case ios_base::in | ios_base::binary:

     flags = "rb";

     break;

   case ios_base::in | ios_base::out:

     flags = "r+";

     break;

   case ios_base::in | ios_base::out | ios_base::binary:

     flags = "r+b";

     break;

   case ios_base::in | ios_base::out | ios_base::trunc:

     flags = "w+";

     break;

   case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary:

     flags = "w+b";

     break;

   default:                      // The above are the only combinations of

     return false;               // flags allowed by the C++ standard.

   }

   // fbp :  : set permissions !

   (void)permission; // currently unused    //*TY 02/26/2000 - added to suppress warning message

   _M_file = FOPEN(name, flags);

   if (_M_file) {

     file_no = fileno(_M_file);

   }

   else

     return false;

   // unset buffering immediately

   setbuf(_M_file, 0);

   _M_is_open = true;

   if (openmode & ios_base::ate) {

     if (FSEEK(_M_file, 0, SEEK_END) == -1)

       _M_is_open = false;

   }

 #elif defined (_STLP_USE_WIN32_IO)

   DWORD dwDesiredAccess, dwCreationDisposition;

   bool doTruncate = false;

   switch (openmode & (~ios_base::ate & ~ios_base::binary)) {

   case ios_base::out:

   case ios_base::out | ios_base::trunc:

     dwDesiredAccess = GENERIC_WRITE;

     dwCreationDisposition = OPEN_ALWAYS;

     // boris : even though it is very non-intuitive, standard

     // requires them both to behave same.

     doTruncate = true;

     break;

   case ios_base::out | ios_base::app:

     dwDesiredAccess = GENERIC_WRITE;

     dwCreationDisposition = OPEN_ALWAYS;

     break;

   case ios_base::in:

     dwDesiredAccess = GENERIC_READ;

     dwCreationDisposition = OPEN_EXISTING;

     permission = 0;             // Irrelevant unless we're writing.

     break;

   case ios_base::in | ios_base::out:

     dwDesiredAccess = GENERIC_READ | GENERIC_WRITE;

     dwCreationDisposition = OPEN_EXISTING;

     break;

   case ios_base::in | ios_base::out | ios_base::trunc:

     dwDesiredAccess = GENERIC_READ | GENERIC_WRITE;

     dwCreationDisposition = OPEN_ALWAYS;

     doTruncate = true;

     break;

   default:                      // The above are the only combinations of

     return false;               // flags allowed by the C++ standard.

   }

   DWORD dwShareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;

 #  if defined(_STLP_USE_WIDE_INTERFACE)

     file_no = CreateFile (_STLP_PRIV __ASCIIToWide(name).c_str(),

 #  else

     file_no = CreateFileA(name,

 #  endif

                           dwDesiredAccess, dwShareMode, 0,

                           dwCreationDisposition, permission, 0);

   if (file_no == INVALID_STLP_FD)

     return false;

   if ((doTruncate && SetEndOfFile(file_no) == 0) ||

       (((openmode & ios_base::ate) != 0) &&

        (SetFilePointer(file_no, 0, NULL, FILE_END) == INVALID_SET_FILE_POINTER))) {

     CloseHandle(file_no);

     return false;

   }

   _M_is_open = true;

 #else

 #  error "Port!"

 #endif /* __unix */

   _M_file_id = file_no;

   _M_should_close = _M_is_open;

   _M_openmode = openmode;

   if (_M_is_open)

     _M_regular_file = _STLP_PRIV __is_regular_file(_M_file_id);

   return (_M_is_open != 0);

 }

 _STLP_DECLSPEC bool _Filebuf_base::_M_open(const char* name, ios_base::openmode openmode) {

   // This doesn't really grant everyone in the world read/write

   // access.  On Unix, file-creation system calls always clear

   // bits that are set in the umask from the permissions flag.

 #ifdef _STLP_USE_WIN32_IO

   return this->_M_open(name, openmode, FILE_ATTRIBUTE_NORMAL);

 #elif defined(__MRC__) || defined(__SC__)    //*TY 02/26/2000 - added support for MPW compilers

   return this->_M_open(name, openmode, 0);

 #else

   return this->_M_open(name, openmode, S_IRUSR | S_IWUSR | S_IRGRP |

                                        S_IWGRP | S_IROTH | S_IWOTH);

 #endif

 }

 #if defined (_STLP_USE_WIN32_IO)

 bool _Filebuf_base::_M_open(_STLP_fd __id, ios_base::openmode init_mode) {

 #  if (defined (_STLP_MSVC_LIB) && !defined (_STLP_WCE)) || \

       (defined (__MINGW32__) && defined (__MSVCRT__)) || defined (__DMC__)

   if (_M_is_open || __id == INVALID_STLP_FD)

     return false;

   if (init_mode != ios_base::__default_mode)

     _M_openmode = init_mode;

   else

     _M_openmode = _get_osfflags(-1, __id);

   _M_is_open = true;

   _M_file_id = __id;

   _M_should_close = false;

   _M_regular_file = _STLP_PRIV __is_regular_file(_M_file_id);

   return true;

 #  else

   (void)__id;

   (void)init_mode;    // dwa 4/27/00 - suppress unused parameter warning

   // not available for the API

   return false;

 #  endif

 }

 #endif /* _STLP_USE_WIN32_IO */

 // Associated the filebuf with a file descriptor pointing to an already-

 // open file.  Mode is set to be consistent with the way that the file

 // was opened.

 _STLP_DECLSPEC bool _Filebuf_base::_M_open(int file_no, ios_base::openmode init_mode) {

   if (_M_is_open || file_no < 0)

     return false;

 #if defined (_STLP_UNIX)

   (void)init_mode;    // dwa 4/27/00 - suppress unused parameter warning

   int mode ;

   mode = fcntl(file_no, F_GETFL);

   if (mode == -1)

     return false;

   _M_openmode = flag_to_openmode(mode);

   _M_file_id = file_no;

 #elif defined(__MRC__) || defined(__SC__)    //*TY 02/26/2000 - added support for MPW compilers

   (void)init_mode;    // dwa 4/27/00 - suppress unused parameter warning

   switch (_iob[file_no]._flag & (_IOREAD|_IOWRT|_IORW) )

   {

   case _IOREAD:

     _M_openmode = ios_base::in; break;

   case _IOWRT:

     _M_openmode = ios_base::out; break;

   case _IORW:

     _M_openmode = ios_base::in | ios_base::out; break;

   default:

     return false;

   }

   _M_file_id = file_no;

 #elif defined (_STLP_USE_UNIX_EMULATION_IO) || defined (_STLP_USE_STDIO_IO)

   (void)init_mode;    // dwa 4/27/00 - suppress unused parameter warning

   int mode ;

   struct STAT buf;

   if (FSTAT(file_no, &buf) != 0)

     return false;

   mode = buf.st_mode;

   switch(mode & (_S_IWRITE | _S_IREAD) ) {

   case _S_IREAD:

     _M_openmode = ios_base::in; break;

   case _S_IWRITE:

     _M_openmode = ios_base::out; break;

   case (_S_IWRITE | _S_IREAD):

     _M_openmode = ios_base::in | ios_base::out; break;

   default:

     return false;

   }

   _M_file_id = file_no;

 #elif (defined (_STLP_USE_WIN32_IO) && defined (_STLP_MSVC_LIB) && !defined (_STLP_WCE) ) || \

       (defined (__MINGW32__) && defined (__MSVCRT__)) || \

        defined (__DMC__)

   HANDLE oshandle = (HANDLE)_get_osfhandle(file_no);

   if (oshandle == INVALID_STLP_FD)

     return false;

   if (init_mode != ios_base::__default_mode)

     _M_openmode = init_mode;

   else

     _M_openmode = _get_osfflags(file_no, oshandle);

   _M_file_id = oshandle;

 #else

   (void)init_mode;    // dwa 4/27/00 - suppress unused parameter warning

   // not available for the API

 #  define _STLP_NO_IMPLEMENTATION

 #endif

 #if !defined (_STLP_NO_IMPLEMENTATION)

   _M_is_open = true;

   _M_should_close = false;

   _M_regular_file = _STLP_PRIV __is_regular_file(_M_file_id);

   return true;

 #else

 #  undef _STLP_NO_IMPLEMENTATION

   return false;

 #endif

 }

 _STLP_DECLSPEC bool _Filebuf_base::_M_close() {

   if (!_M_is_open)

     return false;

   bool ok;

   if (!_M_should_close)

     ok = true;

   else {

 #if defined (_STLP_USE_UNIX_IO)

     ok = (close(_M_file_id) == 0);

 #elif defined (_STLP_USE_UNIX_EMULATION_IO)

     ok = (_close(_M_file_id) == 0);

 #elif defined (_STLP_USE_STDIO_IO)

     ok = (fclose(_M_file) == 0);

 #elif defined (_STLP_USE_WIN32_IO)

     if (_M_file_id != INVALID_STLP_FD) {

       ok = (CloseHandle(_M_file_id) != 0);

     }

     else {

       ok = false;

     }

 #else

     ok = false;

 #endif /* _STLP_USE_UNIX_IO */

   }

   _M_is_open = _M_should_close = false;

   _M_openmode = 0;

   return ok;

 }

 #define _STLP_LF 10

 #define _STLP_CR 13

 #define _STLP_CTRLZ 26

 // Read up to n characters into a buffer.  Return value is number of

 // characters read.

 _STLP_DECLSPEC ptrdiff_t _Filebuf_base::_M_read(char* buf, ptrdiff_t n) {

 #if defined (_STLP_USE_UNIX_IO)

   return read(_M_file_id, buf, n);

 #elif defined (_STLP_USE_UNIX_EMULATION_IO)

   return _read(_M_file_id, buf, n);

 #elif defined (_STLP_USE_WIN32_IO)

   ptrdiff_t readen = 0;

   //Here cast to size_t is safe as n cannot be negative.

   size_t chunkSize = (min)(size_t(0xffffffff), __STATIC_CAST(size_t, n));

   // The following, while validating that we are still able to extract chunkSize

   // charaters to the buffer, avoids extraction of too small chunk of datas

   // which would be counter performant.

   while (__STATIC_CAST(size_t, (n - readen)) >= chunkSize) {

     DWORD NumberOfBytesRead;

     ReadFile(_M_file_id, buf + readen, __STATIC_CAST(DWORD, chunkSize), &NumberOfBytesRead, 0);

     if (NumberOfBytesRead == 0)

       break;

     if (!(_M_openmode & ios_base::binary)) {

       // translate CR-LFs to LFs in the buffer

       char *to = buf + readen;

       char *from = to;

       char *last = from + NumberOfBytesRead - 1;

       for (; from <= last && *from != _STLP_CTRLZ; ++from) {

         if (*from != _STLP_CR)

           *to++ = *from;

         else { // found CR

           if (from < last) { // not at buffer end

             if (*(from + 1) != _STLP_LF)

               *to++ = _STLP_CR;

           }

           else { // last char is CR, peek for LF

             char peek = ' ';

             DWORD NumberOfBytesPeeked;

             ReadFile(_M_file_id, (LPVOID)&peek, 1, &NumberOfBytesPeeked, 0);

             if (NumberOfBytesPeeked != 0) {

               if (peek != _STLP_LF) { //not a <CR><LF> combination

                 *to++ = _STLP_CR;

                 if ((to < buf + n) && (peek != _STLP_CR))

                   //We have enough place to store peek and it is no a special

                   //_STLP_CR character, we can store it.

                   *to++ = peek;

                 else

                   SetFilePointer(_M_file_id, (LONG)-1, 0, SEEK_CUR);

               }

               else {

                 // A <CR><LF> combination, we keep the <LF>:

                 *to++ = _STLP_LF;

               }

             }

             else {

               /* This case is tedious, we could

                *  - put peek back in the file but this would then generate an infinite loop

                *  - report an error as we don't know if in a future call to ReadFile we won't then

                *    get a <LF>. Doing so would make all files with a <CR> last an invalid file

                *    for STLport, a hard solution for STLport clients.

                *  - store the <CR> in the returned buffer, the chosen solution, even if in this

                *    case we could miss a <CR><LF> combination.

                */

               *to++ = _STLP_CR;

             }

           }

         } // found CR

       } // for

       // seek back to TEXT end of file if hit CTRL-Z

       if (from <= last) // terminated due to CTRLZ

         SetFilePointer(_M_file_id, (LONG)((last+1) - from), 0, SEEK_CUR);

       readen += to - (buf + readen);

     }

     else

       readen += NumberOfBytesRead;

   }

   return readen;

 #elif defined (_STLP_USE_STDIO_IO)

   return fread(buf, 1, n, _M_file);

 #else

 #  error "Port!"

 #endif /* __unix */

 }

 // Write n characters from a buffer.  Return value: true if we managed

 // to write the entire buffer, false if we didn't.

 _STLP_DECLSPEC bool _Filebuf_base::_M_write(char* buf, ptrdiff_t n) {

   for (;;) {

     ptrdiff_t written;

 #if defined (_STLP_USE_UNIX_IO)

     written = write(_M_file_id, buf, n);

 #elif defined (_STLP_USE_UNIX_EMULATION_IO)

     written = _write(_M_file_id, buf, n);

 #elif defined (_STLP_USE_WIN32_IO)

     //In the following implementation we are going to cast most of the ptrdiff_t

     //values in size_t to work with coherent unsigned values. Doing so make code

     //more simple especially in the min function call.

     // In append mode, every write does an implicit seek to the end

     // of the file.

     if (_M_openmode & ios_base::app)

       _M_seek(0, ios_base::end);

     if (_M_openmode & ios_base::binary) {

       // binary mode

       size_t bytes_to_write = (size_t)n;

       DWORD NumberOfBytesWritten;

       written = 0;

       for (; bytes_to_write != 0;) {

         WriteFile(_M_file_id, buf + written,

                   __STATIC_CAST(DWORD, (min)(size_t(0xffffffff), bytes_to_write)),

                   &NumberOfBytesWritten, 0);

         if (NumberOfBytesWritten == 0)

           return false;

         bytes_to_write -= NumberOfBytesWritten;

         written += NumberOfBytesWritten;

       }

     }

     else {

       char textbuf[_TEXTBUF_SIZE + 1]; // extra 1 in case LF at end

       char * nextblock = buf, * ptrtextbuf = textbuf;

       char * endtextbuf = textbuf + _TEXTBUF_SIZE;

       char * endblock = buf + n;

       ptrdiff_t nextblocksize = (min) (n, (ptrdiff_t)_TEXTBUF_SIZE);

       char * nextlf;

       while ( (nextblocksize > 0) &&

               (nextlf = (char *)memchr(nextblock, _STLP_LF, nextblocksize)) != 0) {

         ptrdiff_t linelength = nextlf - nextblock;

         memcpy(ptrtextbuf, nextblock, linelength);

         ptrtextbuf += linelength;

         nextblock += (linelength + 1);

         * ptrtextbuf ++ = _STLP_CR;

         * ptrtextbuf ++ = _STLP_LF;

         nextblocksize = (min) (ptrdiff_t(endblock - nextblock),

                                (max) (ptrdiff_t(0), ptrdiff_t(endtextbuf - ptrtextbuf)));

       }

       // write out what's left, > condition is here since for LF at the end ,

       // endtextbuf may get < ptrtextbuf ...

       if (nextblocksize > 0) {

         memcpy(ptrtextbuf, nextblock, nextblocksize);

         ptrtextbuf += nextblocksize;

         nextblock += nextblocksize;

       }

       // now write out the translated buffer

       char * writetextbuf = textbuf;

       for (size_t NumberOfBytesToWrite = (size_t)(ptrtextbuf - textbuf);

            NumberOfBytesToWrite;) {

         DWORD NumberOfBytesWritten;

         WriteFile((HANDLE)_M_file_id, writetextbuf,

                   __STATIC_CAST(DWORD, (min)(size_t(0xffffffff), NumberOfBytesToWrite)),

                   &NumberOfBytesWritten, 0);

         if (!NumberOfBytesWritten) // write shortfall

           return false;

         writetextbuf += NumberOfBytesWritten;

         NumberOfBytesToWrite -= NumberOfBytesWritten;

       }

       // count non-translated characters

       written = (nextblock - buf);

     }

 #elif defined (_STLP_USE_STDIO_IO)

     written = fwrite(buf, 1, n, _M_file);

 #else

 #  error "Port!"

 #endif /* __unix */

     if (n == written)

       return true;

     else if (written > 0 && written < n) {

       n -= written;

       buf += written;

     }

     else

       return false;

   }

 }

 #ifdef _STLP_USE_WIN32_IO

 #  define STL_SEEK_SET FILE_BEGIN

 #  define STL_SEEK_CUR FILE_CURRENT

 #  define STL_SEEK_END FILE_END

 #else

 #  define STL_SEEK_SET SEEK_SET

 #  define STL_SEEK_CUR SEEK_CUR

 #  define STL_SEEK_END SEEK_END

 #endif

 // Wrapper for lseek or the like.

 _STLP_DECLSPEC streamoff _Filebuf_base::_M_seek(streamoff offset, ios_base::seekdir dir) {

   streamoff result = -1;

   int whence;

   switch(dir) {

   case ios_base::beg:

     if (offset < 0 /* || offset > _M_file_size() */ )

       return streamoff(-1);

     whence = STL_SEEK_SET;

     break;

   case ios_base::cur:

     whence = STL_SEEK_CUR;

     break;

   case ios_base::end:

     if (/* offset > 0 || */  -offset > _M_file_size() )

       return streamoff(-1);

     whence = STL_SEEK_END;

     break;

   default:

     return streamoff(-1);

   }

 #if defined (_STLP_USE_UNIX_IO) || defined (_STLP_USE_UNIX_EMULATION_IO)

   result = LSEEK(_M_file_id, offset, whence);

 #elif defined (_STLP_USE_STDIO_IO)

 #if defined (__SYMBIAN32__)

   /* This function is a wrapper for lseek and expects to return the offset in bytes from the beginning of the file. 

     It is used by tellg as well as tellp (for setting/getting the file pointer). 

     We don't want to use fseek for that. */

   if (FSEEK(_M_file, offset, whence) != 0)

 	  return streamoff(-1);

 	result = FTELL(_M_file);

 #else

   result = FSEEK(_M_file, offset, whence);

 #endif

 #elif defined (_STLP_USE_WIN32_IO)

   LARGE_INTEGER li;

   li.QuadPart = offset;

   li.LowPart = SetFilePointer(_M_file_id, li.LowPart, &li.HighPart, whence);

   if (li.LowPart != INVALID_SET_FILE_POINTER || GetLastError() == NO_ERROR)

     result = li.QuadPart;

 #else

 #  error "Port!"

 #endif

   return result;

 }

 // Attempts to memory-map len bytes of the current file, starting

 // at position offset.  Precondition: offset is a multiple of the

 // page size.  Postcondition: return value is a null pointer if the

 // memory mapping failed.  Otherwise the return value is a pointer to

 // the memory-mapped file and the file position is set to offset.

 _STLP_DECLSPEC void* _Filebuf_base::_M_mmap(streamoff offset, streamoff len) {

   void* base;

 #if defined (_STLP_UNIX) && !defined(__DJGPP) && !defined(_CRAY)

   base = MMAP(0, len, PROT_READ, MAP_PRIVATE, _M_file_id, offset);

   if (base != (void*)MAP_FAILED) {

     if (LSEEK(_M_file_id, offset + len, SEEK_SET) < 0) {

       this->_M_unmap(base, len);

       base = 0;

     }

   } else

     base =0;

 #elif defined (_STLP_USE_WIN32_IO)

   _M_view_id = CreateFileMapping(_M_file_id, (PSECURITY_ATTRIBUTES)0 ,

                                  PAGE_READONLY, 0 /* len >> 32 */ ,

                                  0 /* len & 0xFFFFFFFF */ , // low-order DWORD of size

                                  0);

   if (_M_view_id) {

 #  if 0

 /*

     printf("view %x created from file %x, error = %d, size = %d, map_offset = %d map_len = %d\n",

      _M_view_id, _M_file_id, GetLastError(),

      (int)cur_filesize, ULL(offset) & 0xffffffff, len);

 */

 #  endif

     base = MapViewOfFile(_M_view_id, FILE_MAP_READ, __STATIC_CAST(DWORD, ULL(offset) >> 32),

                          __STATIC_CAST(DWORD, ULL(offset) & 0xffffffff),

 #  if !defined (__DMC__)

                          __STATIC_CAST(SIZE_T, len));

 #  else

                          __STATIC_CAST(DWORD, len));

 #  endif

     // check if mapping succeded and is usable

     if (base == 0  || _M_seek(offset + len, ios_base::beg) < 0) {

       this->_M_unmap(base, len);

       base = 0;

     }

   } else

     base = 0;

 #else

   (void)len;    //*TY 02/26/2000 - unused variables

   (void)offset;    //*TY 02/26/2000 -

   base = 0;

 #endif

   return base;

 }

 _STLP_DECLSPEC void _Filebuf_base::_M_unmap(void* base, streamoff len) {

   // precondition : there is a valid mapping at the moment

 #if defined (_STLP_UNIX)  && !defined(__DJGPP) && !defined(_CRAY)

   munmap((char*)base, len);

 #elif defined (_STLP_USE_WIN32_IO)

   if (base != NULL)

     UnmapViewOfFile(base);

   // destroy view handle as well

   if (_M_view_id != NULL)

     CloseHandle(_M_view_id);

   _M_view_id = NULL;

   (void)len; //unused variable

 #else

   (void)len;    //*TY 02/26/2000 - unused variables

   (void)base;   //*TY 02/26/2000 -

 #endif

 }

 #if defined (__SYMBIAN32__) && defined(__EPOC32__)

 _STLP_DECLSPEC size_t _Filebuf_base::__page_size()

 {

 	return _Filebuf_base::_M_page_size;

 }

 #endif

 // fbp : let us map 1 MB maximum, just be sure not to trash VM

 #define MMAP_CHUNK 0x100000L

 _STLP_DECLSPEC int _STLP_CALL

 _Underflow<char, char_traits<char> >::_M_doit (basic_filebuf<char, char_traits<char> >* __this) {

   if (!__this->_M_in_input_mode) {

     if (!__this->_M_switch_to_input_mode())

       return traits_type::eof();

   }

   else if (__this->_M_in_putback_mode) {

     __this->_M_exit_putback_mode();

     if (__this->gptr() != __this->egptr()) {

       int_type __c = traits_type::to_int_type(*__this->gptr());

       return __c;

     }

   }

   // If it's a disk file, and if the internal and external character

   // sequences are guaranteed to be identical, then try to use memory

   // mapped I/O.  Otherwise, revert to ordinary read.

   if (__this->_M_base.__regular_file()

       && __this->_M_always_noconv

       && __this->_M_base._M_in_binary_mode()) {

     // If we've mmapped part of the file already, then unmap it.

     if (__this->_M_mmap_base)

       __this->_M_base._M_unmap(__this->_M_mmap_base, __this->_M_mmap_len);

     __this->_M_mmap_base = 0;

     __this->_M_mmap_len = 0;

     // Determine the position where we start mapping.  It has to be

     // a multiple of the page size.

     streamoff __cur = __this->_M_base._M_seek(0, ios_base::cur);

     streamoff __size = __this->_M_base._M_file_size();

     if (__size > 0 && __cur >= 0 && __cur < __size) {

       streamoff __offset = (__cur / __this->_M_base.__page_size()) * __this->_M_base.__page_size();

       streamoff __remainder = __cur - __offset;

       __this->_M_mmap_len = __size - __offset;

       if (__this->_M_mmap_len > MMAP_CHUNK)

         __this->_M_mmap_len = MMAP_CHUNK;

       if ((__this->_M_mmap_base =

         __this->_M_base._M_mmap(__offset, __this->_M_mmap_len)) != 0) {

         __this->setg((char*) __this->_M_mmap_base,

                      (char*) __this->_M_mmap_base + __STATIC_CAST(ptrdiff_t, __remainder),

                      (char*) __this->_M_mmap_base + __STATIC_CAST(ptrdiff_t, __this->_M_mmap_len));

         return traits_type::to_int_type(*__this->gptr());

       }

     } else /* size > 0 ... */ {

       // There is nothing to map. We unmapped the file above, now zap pointers.

       __this->_M_mmap_base = 0;

       __this->_M_mmap_len = 0;

     }

   }

   return __this->_M_underflow_aux();

 }

 //----------------------------------------------------------------------

 // Force instantiation of filebuf and fstream classes.

 #if !defined(_STLP_NO_FORCE_INSTANTIATE)

 template class basic_filebuf<char, char_traits<char> >;

 template class basic_ifstream<char, char_traits<char> >;

 template class basic_ofstream<char, char_traits<char> >;

 template class basic_fstream<char, char_traits<char> >;

 #  if !defined (_STLP_NO_WCHAR_T)

 template class _Underflow<wchar_t, char_traits<wchar_t> >;

 template class basic_filebuf<wchar_t, char_traits<wchar_t> >;

 template class basic_ifstream<wchar_t, char_traits<wchar_t> >;

 template class basic_ofstream<wchar_t, char_traits<wchar_t> >;

 template class basic_fstream<wchar_t, char_traits<wchar_t> >;

 #  endif /* _STLP_NO_WCHAR_T */

 #endif

 _STLP_END_NAMESPACE

 // Local Variables:

 // mode:C++

 // End: