sl@0: /*
sl@0:  * Portions Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.
sl@0:  *
sl@0:  * Copyright (c) 1999
sl@0:  * Silicon Graphics Computer Systems, Inc.
sl@0:  *
sl@0:  * Copyright (c) 1999
sl@0:  * Boris Fomitchev
sl@0:  *
sl@0:  * This material is provided "as is", with absolutely no warranty expressed
sl@0:  * or implied. Any use is at your own risk.
sl@0:  *
sl@0:  * Permission to use or copy this software for any purpose is hereby granted
sl@0:  * without fee, provided the above notices are retained on all copies.
sl@0:  * Permission to modify the code and to distribute modified code is granted,
sl@0:  * provided the above notices are retained, and a notice that the code was
sl@0:  * modified is included with the above copyright notice.
sl@0:  *
sl@0:  */
sl@0: 
sl@0: 
sl@0: #include "stlport_prefix.h"
sl@0: 
sl@0: #if defined  (__SUNPPRO_CC)  && !defined (_STLP_NO_NEW_C_HEADERS)
sl@0: #  include <time.h>
sl@0: // For sunpro, it chokes if time.h is included through stat.h
sl@0: #endif
sl@0: 
sl@0: #include <fstream>
sl@0: 
sl@0: #ifdef __CYGWIN__
sl@0: #  define __int64 long long
sl@0: #endif
sl@0: 
sl@0: #if defined (_STLP_USE_UNIX_IO)
sl@0: extern "C" {
sl@0: // open/close/read/write
sl@0: #  include <sys/stat.h>           // For stat
sl@0: #  if !defined (_CRAY) && ! defined (__EMX__)
sl@0: #    include <sys/mman.h>           // For mmap
sl@0: #  endif
sl@0: 
sl@0: //  on HP-UX 11, this one contradicts with pthread.h on pthread_atfork, unless we unset this
sl@0: #  if defined (__hpux) && defined (__GNUC__)
sl@0: #    undef _INCLUDE_POSIX1C_SOURCE
sl@0: #  endif
sl@0: 
sl@0: #  include <unistd.h>
sl@0: #  include <fcntl.h>
sl@0: }
sl@0: #  ifdef __APPLE__
sl@0: #    include <sys/sysctl.h>
sl@0: #  endif
sl@0: #elif defined (_STLP_USE_WIN32_IO)
sl@0: #  define WIN32_LEAN_AND_MEAN
sl@0: #  include <windows.h>
sl@0: 
sl@0: #  ifdef __BORLANDC__
sl@0: #      include <cfcntl.h>            // For _O_RDONLY, etc
sl@0: #    include <sys/stat.h>         // For _fstat
sl@0: #  elif !defined(_STLP_WCE)
sl@0: #    include <io.h>               // For _get_osfhandle
sl@0: #    include <fcntl.h>            // For _O_RDONLY, etc
sl@0: #    include <sys/stat.h>         // For _fstat
sl@0: #  endif
sl@0: #  define _TEXTBUF_SIZE 0x1000
sl@0: #elif defined (_STLP_USE_UNIX_EMULATION_IO)
sl@0: #  if defined( __MSL__ )
sl@0: #    include <unistd.h>
sl@0: #  else
sl@0: #    include <io.h>
sl@0: #  endif
sl@0: #  include <fcntl.h>
sl@0: #  include <sys/stat.h>
sl@0: #elif defined (_STLP_USE_STDIO_IO)
sl@0: #  include <cstdio>
sl@0: #  if !(defined(__MRC__) || defined(__SC__) || defined(__ISCPP__) )
sl@0: extern "C" {
sl@0: #    include <sys/stat.h>
sl@0: }
sl@0: #  endif
sl@0: #  if defined( __MSL__ )
sl@0: #    include <unix.h>
sl@0: #  endif
sl@0: #  if defined(__ISCPP__)
sl@0: #    include <c_locale_is/filestat.h>
sl@0: #  endif
sl@0: #  if (defined(__BEOS__) && defined(__INTEL__)) || defined (__SYMBIAN32__)
sl@0: #    include <fcntl.h>
sl@0: #    include <sys/stat.h>         // For _fstat
sl@0: #    define _S_IREAD S_IREAD
sl@0: #    define _S_IWRITE S_IWRITE
sl@0: #    define _S_IFREG S_IFREG
sl@0: #  endif
sl@0: #else
sl@0: #  error "Configure i/o !"
sl@0: #endif
sl@0: 
sl@0: #if defined (_STLP_USE_WIN32_IO)
sl@0: const _STLP_fd INVALID_STLP_FD = INVALID_HANDLE_VALUE;
sl@0: #  if !defined (INVALID_SET_FILE_POINTER)
sl@0: #    define INVALID_SET_FILE_POINTER 0xffffffff
sl@0: #  endif
sl@0: #elif defined (_STLP_USE_UNIX_EMULATION_IO) || defined (_STLP_USE_STDIO_IO) || defined (_STLP_USE_UNIX_IO)
sl@0: const _STLP_fd INVALID_STLP_FD = -1;
sl@0: #else
sl@0: #  error "Configure i/o !"
sl@0: #endif
sl@0: 
sl@0: // map permission masks
sl@0: #if defined (_STLP_USE_UNIX_EMULATION_IO) || defined (_STLP_USE_STDIO_IO)
sl@0: #  ifndef S_IRUSR
sl@0: #    define S_IRUSR _S_IREAD
sl@0: #    define S_IWUSR _S_IWRITE
sl@0: #    define S_IRGRP _S_IREAD
sl@0: #    define S_IWGRP _S_IWRITE
sl@0: #    define S_IROTH _S_IREAD
sl@0: #    define S_IWOTH _S_IWRITE
sl@0: #  endif
sl@0: #  ifndef O_RDONLY
sl@0: #    define O_RDONLY _O_RDONLY
sl@0: #    define O_WRONLY _O_WRONLY
sl@0: #    define O_RDWR   _O_RDWR
sl@0: #    define O_APPEND _O_APPEND
sl@0: #    define O_CREAT  _O_CREAT
sl@0: #    define O_TRUNC  _O_TRUNC
sl@0: #    define O_TEXT   _O_TEXT
sl@0: #    define O_BINARY _O_BINARY
sl@0: #  endif
sl@0: 
sl@0: #  ifdef __MSL__
sl@0: #    define _O_TEXT 0x0
sl@0: #    if !defined( O_TEXT )
sl@0: #      define O_TEXT _O_TEXT
sl@0: #    endif
sl@0: #    define _S_IFREG S_IFREG
sl@0: #    define S_IREAD        S_IRUSR
sl@0: #    define S_IWRITE       S_IWUSR
sl@0: #    define S_IEXEC        S_IXUSR
sl@0: #    define _S_IWRITE S_IWRITE
sl@0: #    define _S_IREAD S_IREAD
sl@0: #    define _open open
sl@0: #    define _lseek lseek
sl@0: #    define _close close
sl@0: #    define _read read
sl@0: #    define _write write
sl@0: #  endif
sl@0: #endif
sl@0: 
sl@0: #ifndef O_ACCMODE
sl@0: #  define O_ACCMODE (O_RDONLY|O_WRONLY|O_RDWR)
sl@0: #endif
sl@0: 
sl@0: #include "fstream_impl.h"
sl@0: 
sl@0: #ifdef _STLP_LONG_LONG
sl@0: #  define ULL(x) ((unsigned _STLP_LONG_LONG)x)
sl@0: #elif defined(__MRC__) || defined(__SC__)    //*TY 02/25/2000 - added support for MPW compilers
sl@0: #  include <Math64.h>
sl@0: #  define ULL(x) (U64SetU(x))
sl@0: #elif defined(__ISCPP__)
sl@0: #  include "uint64.h"
sl@0: #elif defined(__SYMBIAN32__)
sl@0: #  include <sys/types.h>
sl@0: #else
sl@0: #  error "there should be some long long type on the system!"
sl@0: #endif
sl@0: 
sl@0: 
sl@0: #if defined(__SYMBIAN32__WSD__) 
sl@0: # include "libstdcppwsd.h"
sl@0: 
sl@0: _STLP_DECLSPEC size_t& get_fstream_Filebuf_Base_GetPageSize()
sl@0: {
sl@0: 	return get_libcpp_wsd().fstream_Filebuf_base_M_page_size;
sl@0: }
sl@0: 
sl@0: void filebuf_page_size_init()
sl@0: {
sl@0: 	get_fstream_Filebuf_Base_GetPageSize() = 4096;	
sl@0: }
sl@0: #endif
sl@0: 
sl@0: _STLP_BEGIN_NAMESPACE
sl@0: // Compare with streamoff definition in stl/char_traits.h!
sl@0: 
sl@0: #ifdef _STLP_USE_DEFAULT_FILE_OFFSET
sl@0: #  define FOPEN fopen
sl@0: #  define FSEEK fseek
sl@0: #  define FSTAT fstat
sl@0: #  define STAT  stat
sl@0: #  define FTELL ftell
sl@0: #  define LSEEK lseek
sl@0: #  define MMAP  mmap
sl@0: #  define OPEN  open
sl@0: #elif defined(_LARGEFILE_SOURCE) || defined(_LARGEFILE64_SOURCE) /* || defined(__USE_FILE_OFFSET64) */ \
sl@0:       /* || (defined(_FILE_OFFSET_BITS) && (_FILE_OFFSET_BITS == 64)) */ /* || defined(__sgi) */
sl@0: #  define FOPEN fopen64
sl@0: #  define FSEEK fseeko64
sl@0: #  define FSTAT fstat64
sl@0: #  define STAT  stat64
sl@0: #  define FTELL ftello64
sl@0: #  define LSEEK lseek64
sl@0: #  define MMAP  mmap64
sl@0: #  define OPEN  open64
sl@0: #else
sl@0: #  define OPEN  open
sl@0: #  define FSEEK fseek
sl@0: #  define FSTAT fstat
sl@0: #  define STAT  stat
sl@0: #  define FTELL ftell
sl@0: #  define LSEEK lseek
sl@0: #  define MMAP  mmap
sl@0: #  define OPEN  open
sl@0: #endif
sl@0: #ifdef _STLP_USE_UNIX_IO
sl@0: #  ifndef MAP_FAILED /* MMAP failure return code */
sl@0: #    define MAP_FAILED -1
sl@0: #  endif
sl@0: #elif defined (_STLP_USE_UNIX_EMULATION_IO)
sl@0: #  define LSEEK _lseek
sl@0: #endif
sl@0: 
sl@0: #if !defined(__MSL__) && !defined(__MRC__) && !defined(__SC__) && !defined(_STLP_WCE)    //*TY 04/15/2000 - exclude mpw compilers also
sl@0: static ios_base::openmode flag_to_openmode(int mode) {
sl@0:   ios_base::openmode ret = ios_base::__default_mode;
sl@0: 
sl@0:   switch(mode & O_ACCMODE) {
sl@0:   case O_RDONLY:
sl@0:     ret = ios_base::in; break;
sl@0:   case O_WRONLY:
sl@0:     ret = ios_base::out; break;
sl@0:   case O_RDWR:
sl@0:     ret = ios_base::in | ios_base::out; break;
sl@0:   }
sl@0: 
sl@0:   if (mode & O_APPEND)
sl@0:     ret |= ios_base::app;
sl@0: 
sl@0: #  if defined (_STLP_USE_WIN32_IO)
sl@0:   if (mode & O_BINARY)
sl@0:     ret |= ios_base::binary;
sl@0: #  endif
sl@0: 
sl@0:   return ret;
sl@0: }
sl@0: #endif /* MSL */
sl@0: 
sl@0: _STLP_MOVE_TO_PRIV_NAMESPACE
sl@0: 
sl@0: // Helper functions for _Filebuf_base.
sl@0: 
sl@0: bool __is_regular_file(_STLP_fd fd) {
sl@0: 
sl@0: #if defined (_STLP_UNIX)
sl@0: 
sl@0:   struct STAT buf;
sl@0:   return FSTAT(fd, &buf) == 0 && S_ISREG(buf.st_mode);
sl@0: 
sl@0: #elif defined(__MRC__) || defined(__SC__)    //*TY 02/25/2000 - added support for MPW compilers
sl@0: 
sl@0: #  pragma unused(fd)
sl@0:   return true;  // each file is a regular file under mac os, isn't it? (we don't have fstat())
sl@0: 
sl@0: #elif defined(_STLP_USE_UNIX_EMULATION_IO) || defined (_STLP_USE_STDIO_IO)
sl@0: 
sl@0:   struct STAT buf;
sl@0:   return FSTAT(fd, &buf) == 0 && (buf.st_mode & _S_IFREG) != 0 ;
sl@0: 
sl@0: #elif defined (_STLP_USE_WIN32_IO) && !defined(_STLP_WCE)
sl@0: 
sl@0:   return (GetFileType(fd) & ~FILE_TYPE_REMOTE) == FILE_TYPE_DISK;
sl@0: 
sl@0: #else
sl@0:   (void)fd;    // dwa 4/27/00 - suppress unused parameter warning
sl@0:   return false;
sl@0: #endif
sl@0: }
sl@0: 
sl@0: // Number of characters in the file.
sl@0: streamoff __file_size(_STLP_fd fd) {
sl@0:   streamoff ret = 0;
sl@0: 
sl@0: #if defined (_STLP_UNIX)
sl@0: 
sl@0:   struct STAT buf;
sl@0:   if (FSTAT(fd, &buf) == 0 && S_ISREG(buf.st_mode))
sl@0:     ret = buf.st_size > 0 ? buf.st_size : 0;
sl@0: 
sl@0: #elif defined(__MRC__) || defined(__SC__)    //*TY 02/25/2000 - added support for MPW compilers
sl@0: 
sl@0: #  pragma unused(fd)
sl@0: 
sl@0: #elif defined(_STLP_USE_UNIX_EMULATION_IO) || defined (_STLP_USE_STDIO_IO)
sl@0: 
sl@0:   struct STAT buf;
sl@0:   if (FSTAT(fd, &buf) == 0 && (buf.st_mode & _S_IFREG) != 0)
sl@0:     ret = buf.st_size > 0 ? buf.st_size : 0;
sl@0: 
sl@0: #elif defined (_STLP_USE_WIN32_IO)
sl@0: 
sl@0:  LARGE_INTEGER li;
sl@0:  li.LowPart = GetFileSize(fd, (unsigned long*) &li.HighPart);
sl@0:  if (li.LowPart != INVALID_FILE_SIZE || GetLastError() == NO_ERROR)
sl@0:    ret = li.QuadPart;
sl@0: 
sl@0: #else
sl@0:   (void)fd;    // dwa 4/27/00 - suppress unused parameter warning
sl@0: #endif
sl@0:   return ret;
sl@0: }
sl@0: 
sl@0: _STLP_MOVE_TO_STD_NAMESPACE
sl@0: 
sl@0: // Visual C++ and Intel use this, but not Metrowerks
sl@0: // Also MinGW, msvcrt.dll (but not crtdll.dll) dependent version
sl@0: #if (!defined (__MSL__) && !defined (_STLP_WCE) && defined (_STLP_MSVC_LIB) && defined (_WIN32)) || \
sl@0:     (defined (__MINGW32__) && defined (__MSVCRT__) && !(defined (__SYMBIAN32__) && defined(__GCCXML__)) )
sl@0: 
sl@0: // fcntl(fileno, F_GETFL) for Microsoft library
sl@0: // 'semi-documented' defines:
sl@0: #  define IOINFO_L2E          5
sl@0: #  define IOINFO_ARRAY_ELTS   (1 << IOINFO_L2E)
sl@0: #  define _pioinfo(i) ( __pioinfo[(i) >> IOINFO_L2E] + \
sl@0:               ((i) & (IOINFO_ARRAY_ELTS - 1)) )
sl@0: #  define FAPPEND         0x20    // O_APPEND flag
sl@0: #  define FTEXT           0x80    // O_TEXT flag
sl@0: // end of 'semi-documented' defines
sl@0: 
sl@0: // 'semi-documented' internal structure
sl@0: extern "C" {
sl@0:   struct ioinfo {
sl@0:     long osfhnd;    // the real os HANDLE
sl@0:     char osfile;    // file handle flags
sl@0:     char pipech;    // pipe buffer
sl@0: #  if defined (_MT)
sl@0:     // multi-threaded locking
sl@0:     int lockinitflag;
sl@0:     CRITICAL_SECTION lock;
sl@0: #  endif  /* _MT */
sl@0:   };
sl@0: #  if defined (__MINGW32__)
sl@0:  __MINGW_IMPORT ioinfo * __pioinfo[];
sl@0: #  else
sl@0:   extern _CRTIMP ioinfo * __pioinfo[];
sl@0: #  endif
sl@0: } // extern "C"
sl@0: // end of 'semi-documented' declarations
sl@0: 
sl@0: static ios_base::openmode _get_osfflags(int fd, HANDLE oshandle) {
sl@0:   char dosflags = 0;
sl@0:   if (fd >= 0)
sl@0:     dosflags = _pioinfo(fd)->osfile;
sl@0:   //else
sl@0:     //the file will be considered as open in binary mode with no append attribute
sl@0:   // end of 'semi-documented' stuff
sl@0: 
sl@0:   int mode = 0;
sl@0:   if (dosflags & FAPPEND)
sl@0:     mode |= O_APPEND;
sl@0: 
sl@0:   if (dosflags & FTEXT)
sl@0:     mode |= O_TEXT;
sl@0:   else
sl@0:     mode |= O_BINARY;
sl@0: 
sl@0:   // For Read/Write access we have to guess
sl@0:   DWORD dummy, dummy2;
sl@0:   BOOL writeOk = WriteFile(oshandle, &dummy2, 0, &dummy, 0);
sl@0:   BOOL readOk = ReadFile(oshandle, &dummy2, 0, &dummy, NULL);
sl@0:   if (writeOk && readOk)
sl@0:     mode |= O_RDWR;
sl@0:   else if (readOk)
sl@0:     mode |= O_RDONLY;
sl@0:   else
sl@0:     mode |= O_WRONLY;
sl@0: 
sl@0:   return flag_to_openmode(mode);
sl@0: }
sl@0: 
sl@0: #elif defined (__DMC__)
sl@0: 
sl@0: #  define FHND_APPEND 0x04
sl@0: #  define FHND_DEVICE 0x08
sl@0: #  define FHND_TEXT   0x10
sl@0: 
sl@0: extern "C" unsigned char __fhnd_info[_NFILE];
sl@0: 
sl@0: static ios_base::openmode _get_osfflags(int fd, HANDLE oshandle) {
sl@0:   int mode = 0;
sl@0: 
sl@0:   if (__fhnd_info[fd] & FHND_APPEND)
sl@0:     mode |= O_APPEND;
sl@0: 
sl@0:   if (__fhnd_info[fd] & FHND_TEXT == 0)
sl@0:     mode |= O_BINARY;
sl@0: 
sl@0:   for (FILE *fp = &_iob[0]; fp < &_iob[_NFILE]; fp++) {
sl@0:     if ((fileno(fp) == fd) && (fp->_flag & (_IOREAD | _IOWRT | _IORW))) {
sl@0:       const int osflags = fp->_flag;
sl@0: 
sl@0:       if ((osflags & _IOREAD) && !(osflags & _IOWRT) && !(osflags & _IORW))
sl@0:         mode |= O_RDONLY;
sl@0:       else if ((osflags & _IOWRT) && !(osflags & _IOREAD) && !(osflags & _IORW))
sl@0:         mode |= O_WRONLY;
sl@0:       else
sl@0:         mode |= O_RDWR;
sl@0:       break;
sl@0:     }
sl@0:   }
sl@0: 
sl@0:   return flag_to_openmode(mode);
sl@0: }
sl@0: #endif
sl@0: 
sl@0: #if !defined(__SYMBIAN32__WSD__)
sl@0: size_t _Filebuf_base::_M_page_size = 4096;
sl@0: #endif //__SYMBIAN32__WSD__
sl@0: 
sl@0: _STLP_DECLSPEC _Filebuf_base::_Filebuf_base()
sl@0:   : _M_file_id(INVALID_STLP_FD),
sl@0: #if defined (_STLP_USE_WIN32_IO)
sl@0:     _M_view_id(0),
sl@0: #endif
sl@0:     _M_openmode(0),
sl@0:     _M_is_open(false),
sl@0:     _M_should_close(false)
sl@0: {}
sl@0: 
sl@0: void _Filebuf_base::_S_initialize() {
sl@0: #if defined (_STLP_UNIX)  && !defined (__DJGPP) && !defined (_CRAY)
sl@0: #  if defined (__APPLE__)
sl@0:   int mib[2];
sl@0:   size_t pagesize, len;
sl@0:   mib[0] = CTL_HW;
sl@0:   mib[1] = HW_PAGESIZE;
sl@0:   len = sizeof(pagesize);
sl@0:   sysctl(mib, 2, &pagesize, &len, NULL, 0);
sl@0:   _M_page_size = pagesize;
sl@0: #  elif defined (__DJGPP) && defined (_CRAY)
sl@0:   _M_page_size = BUFSIZ;
sl@0: #  else
sl@0:   _M_page_size = sysconf(_SC_PAGESIZE);
sl@0: #  endif
sl@0: #elif defined (_STLP_USE_WIN32_IO)
sl@0:   SYSTEM_INFO SystemInfo;
sl@0:   GetSystemInfo(&SystemInfo);
sl@0:   _M_page_size = SystemInfo.dwPageSize;
sl@0:   // might be .dwAllocationGranularity
sl@0: #endif
sl@0: }
sl@0: 
sl@0: // Return the size of the file.  This is a wrapper for stat.
sl@0: // Returns zero if the size cannot be determined or is ill-defined.
sl@0: _STLP_DECLSPEC streamoff _Filebuf_base::_M_file_size() {
sl@0:   return _STLP_PRIV __file_size(_M_file_id);
sl@0: }
sl@0: 
sl@0: _STLP_DECLSPEC bool _Filebuf_base::_M_open(const char* name, ios_base::openmode openmode,
sl@0:                             long permission) {
sl@0:   _STLP_fd file_no;
sl@0: 
sl@0:   if (_M_is_open)
sl@0:     return false;
sl@0: 
sl@0: #if defined (_STLP_USE_UNIX_IO) || defined (_STLP_USE_UNIX_EMULATION_IO)
sl@0:   int flags = 0;
sl@0: 
sl@0:   // Unix makes no distinction between text and binary files.
sl@0:   switch(openmode & (~ios_base::ate & ~ios_base::binary)) {
sl@0:   case ios_base::out:
sl@0:   case ios_base::out | ios_base::trunc:
sl@0:     flags = O_WRONLY | O_CREAT | O_TRUNC;
sl@0:     break;
sl@0:   case ios_base::out | ios_base::app:
sl@0:     flags = O_WRONLY | O_CREAT | O_APPEND;
sl@0:     break;
sl@0:   case ios_base::in:
sl@0:     flags = O_RDONLY;
sl@0:     permission = 0;             // Irrelevant unless we're writing.
sl@0:     break;
sl@0:   case ios_base::in | ios_base::out:
sl@0:     flags = O_RDWR;
sl@0:     break;
sl@0:   case ios_base::in | ios_base::out | ios_base::trunc:
sl@0:     flags = O_RDWR | O_CREAT | O_TRUNC;
sl@0:     break;
sl@0:   default:                      // The above are the only combinations of
sl@0:     return false;               // flags allowed by the C++ standard.
sl@0:   }
sl@0: 
sl@0: #  if defined (_STLP_USE_UNIX_EMULATION_IO)
sl@0:   if (openmode & ios_base::binary)
sl@0:     flags |= O_BINARY;
sl@0:   else
sl@0:     flags |= O_TEXT;
sl@0: 
sl@0:   file_no = _open(name, flags, permission);
sl@0: #  else
sl@0:   file_no = OPEN(name, flags, permission);
sl@0: #  endif /* _STLP_USE_UNIX_EMULATION_IO */
sl@0: 
sl@0:   if (file_no < 0)
sl@0:     return false;
sl@0: 
sl@0:   _M_is_open = true;
sl@0: 
sl@0:   if (openmode & ios_base::ate)
sl@0:     if (LSEEK(file_no, 0, SEEK_END) == -1)
sl@0:       _M_is_open = false;
sl@0: 
sl@0: #elif defined (_STLP_USE_STDIO_IO)
sl@0:   // use FILE-based i/o
sl@0:   const char* flags;
sl@0: 
sl@0:   switch(openmode & (~ios_base::ate)) {
sl@0:   case ios_base::out:
sl@0:   case ios_base::out | ios_base::trunc:
sl@0:     flags = "w";
sl@0:     break;
sl@0: 
sl@0:   case ios_base::out | ios_base::binary:
sl@0:   case ios_base::out | ios_base::trunc | ios_base::binary:
sl@0:     flags = "wb";
sl@0:     break;
sl@0: 
sl@0:   case ios_base::out | ios_base::app:
sl@0:     flags = "a";
sl@0:     break;
sl@0: 
sl@0:   case ios_base::out | ios_base::app | ios_base::binary:
sl@0:     flags = "ab";
sl@0:     break;
sl@0: 
sl@0:   case ios_base::in:
sl@0:     flags = "r";
sl@0:     break;
sl@0: 
sl@0:   case ios_base::in | ios_base::binary:
sl@0:     flags = "rb";
sl@0:     break;
sl@0: 
sl@0:   case ios_base::in | ios_base::out:
sl@0:     flags = "r+";
sl@0:     break;
sl@0: 
sl@0:   case ios_base::in | ios_base::out | ios_base::binary:
sl@0:     flags = "r+b";
sl@0:     break;
sl@0: 
sl@0: 
sl@0:   case ios_base::in | ios_base::out | ios_base::trunc:
sl@0:     flags = "w+";
sl@0:     break;
sl@0: 
sl@0:   case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary:
sl@0:     flags = "w+b";
sl@0:     break;
sl@0: 
sl@0:   default:                      // The above are the only combinations of
sl@0:     return false;               // flags allowed by the C++ standard.
sl@0:   }
sl@0: 
sl@0:   // fbp :  : set permissions !
sl@0:   (void)permission; // currently unused    //*TY 02/26/2000 - added to suppress warning message
sl@0:   _M_file = FOPEN(name, flags);
sl@0: 
sl@0:   if (_M_file) {
sl@0:     file_no = fileno(_M_file);
sl@0:   }
sl@0:   else
sl@0:     return false;
sl@0: 
sl@0:   // unset buffering immediately
sl@0:   setbuf(_M_file, 0);
sl@0: 
sl@0:   _M_is_open = true;
sl@0: 
sl@0:   if (openmode & ios_base::ate) {
sl@0:     if (FSEEK(_M_file, 0, SEEK_END) == -1)
sl@0:       _M_is_open = false;
sl@0:   }
sl@0: 
sl@0: #elif defined (_STLP_USE_WIN32_IO)
sl@0:   DWORD dwDesiredAccess, dwCreationDisposition;
sl@0:   bool doTruncate = false;
sl@0: 
sl@0:   switch (openmode & (~ios_base::ate & ~ios_base::binary)) {
sl@0:   case ios_base::out:
sl@0:   case ios_base::out | ios_base::trunc:
sl@0:     dwDesiredAccess = GENERIC_WRITE;
sl@0:     dwCreationDisposition = OPEN_ALWAYS;
sl@0:     // boris : even though it is very non-intuitive, standard
sl@0:     // requires them both to behave same.
sl@0:     doTruncate = true;
sl@0:     break;
sl@0:   case ios_base::out | ios_base::app:
sl@0:     dwDesiredAccess = GENERIC_WRITE;
sl@0:     dwCreationDisposition = OPEN_ALWAYS;
sl@0:     break;
sl@0:   case ios_base::in:
sl@0:     dwDesiredAccess = GENERIC_READ;
sl@0:     dwCreationDisposition = OPEN_EXISTING;
sl@0:     permission = 0;             // Irrelevant unless we're writing.
sl@0:     break;
sl@0:   case ios_base::in | ios_base::out:
sl@0:     dwDesiredAccess = GENERIC_READ | GENERIC_WRITE;
sl@0:     dwCreationDisposition = OPEN_EXISTING;
sl@0:     break;
sl@0:   case ios_base::in | ios_base::out | ios_base::trunc:
sl@0:     dwDesiredAccess = GENERIC_READ | GENERIC_WRITE;
sl@0:     dwCreationDisposition = OPEN_ALWAYS;
sl@0:     doTruncate = true;
sl@0:     break;
sl@0:   default:                      // The above are the only combinations of
sl@0:     return false;               // flags allowed by the C++ standard.
sl@0:   }
sl@0: 
sl@0:   DWORD dwShareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;
sl@0: 
sl@0: #  if defined(_STLP_USE_WIDE_INTERFACE)
sl@0:     file_no = CreateFile (_STLP_PRIV __ASCIIToWide(name).c_str(),
sl@0: #  else
sl@0:     file_no = CreateFileA(name,
sl@0: #  endif
sl@0:                           dwDesiredAccess, dwShareMode, 0,
sl@0:                           dwCreationDisposition, permission, 0);
sl@0: 
sl@0:   if (file_no == INVALID_STLP_FD)
sl@0:     return false;
sl@0: 
sl@0:   if ((doTruncate && SetEndOfFile(file_no) == 0) ||
sl@0:       (((openmode & ios_base::ate) != 0) &&
sl@0:        (SetFilePointer(file_no, 0, NULL, FILE_END) == INVALID_SET_FILE_POINTER))) {
sl@0:     CloseHandle(file_no);
sl@0:     return false;
sl@0:   }
sl@0: 
sl@0:   _M_is_open = true;
sl@0: 
sl@0: #else
sl@0: #  error "Port!"
sl@0: #endif /* __unix */
sl@0: 
sl@0:   _M_file_id = file_no;
sl@0:   _M_should_close = _M_is_open;
sl@0:   _M_openmode = openmode;
sl@0: 
sl@0:   if (_M_is_open)
sl@0:     _M_regular_file = _STLP_PRIV __is_regular_file(_M_file_id);
sl@0: 
sl@0:   return (_M_is_open != 0);
sl@0: }
sl@0: 
sl@0: 
sl@0: _STLP_DECLSPEC bool _Filebuf_base::_M_open(const char* name, ios_base::openmode openmode) {
sl@0:   // This doesn't really grant everyone in the world read/write
sl@0:   // access.  On Unix, file-creation system calls always clear
sl@0:   // bits that are set in the umask from the permissions flag.
sl@0: #ifdef _STLP_USE_WIN32_IO
sl@0:   return this->_M_open(name, openmode, FILE_ATTRIBUTE_NORMAL);
sl@0: #elif defined(__MRC__) || defined(__SC__)    //*TY 02/26/2000 - added support for MPW compilers
sl@0:   return this->_M_open(name, openmode, 0);
sl@0: #else
sl@0:   return this->_M_open(name, openmode, S_IRUSR | S_IWUSR | S_IRGRP |
sl@0:                                        S_IWGRP | S_IROTH | S_IWOTH);
sl@0: #endif
sl@0: }
sl@0: 
sl@0: 
sl@0: #if defined (_STLP_USE_WIN32_IO)
sl@0: bool _Filebuf_base::_M_open(_STLP_fd __id, ios_base::openmode init_mode) {
sl@0: #  if (defined (_STLP_MSVC_LIB) && !defined (_STLP_WCE)) || \
sl@0:       (defined (__MINGW32__) && defined (__MSVCRT__)) || defined (__DMC__)
sl@0: 
sl@0:   if (_M_is_open || __id == INVALID_STLP_FD)
sl@0:     return false;
sl@0: 
sl@0:   if (init_mode != ios_base::__default_mode)
sl@0:     _M_openmode = init_mode;
sl@0:   else
sl@0:     _M_openmode = _get_osfflags(-1, __id);
sl@0: 
sl@0:   _M_is_open = true;
sl@0:   _M_file_id = __id;
sl@0:   _M_should_close = false;
sl@0:   _M_regular_file = _STLP_PRIV __is_regular_file(_M_file_id);
sl@0: 
sl@0:   return true;
sl@0: #  else
sl@0:   (void)__id;
sl@0:   (void)init_mode;    // dwa 4/27/00 - suppress unused parameter warning
sl@0: 
sl@0:   // not available for the API
sl@0:   return false;
sl@0: 
sl@0: #  endif
sl@0: }
sl@0: #endif /* _STLP_USE_WIN32_IO */
sl@0: 
sl@0: // Associated the filebuf with a file descriptor pointing to an already-
sl@0: // open file.  Mode is set to be consistent with the way that the file
sl@0: // was opened.
sl@0: _STLP_DECLSPEC bool _Filebuf_base::_M_open(int file_no, ios_base::openmode init_mode) {
sl@0:   if (_M_is_open || file_no < 0)
sl@0:     return false;
sl@0: 
sl@0: #if defined (_STLP_UNIX)
sl@0:   (void)init_mode;    // dwa 4/27/00 - suppress unused parameter warning
sl@0:   int mode ;
sl@0:   mode = fcntl(file_no, F_GETFL);
sl@0: 
sl@0:   if (mode == -1)
sl@0:     return false;
sl@0: 
sl@0:   _M_openmode = flag_to_openmode(mode);
sl@0:   _M_file_id = file_no;
sl@0: #elif defined(__MRC__) || defined(__SC__)    //*TY 02/26/2000 - added support for MPW compilers
sl@0:   (void)init_mode;    // dwa 4/27/00 - suppress unused parameter warning
sl@0:   switch (_iob[file_no]._flag & (_IOREAD|_IOWRT|_IORW) )
sl@0:   {
sl@0:   case _IOREAD:
sl@0:     _M_openmode = ios_base::in; break;
sl@0:   case _IOWRT:
sl@0:     _M_openmode = ios_base::out; break;
sl@0:   case _IORW:
sl@0:     _M_openmode = ios_base::in | ios_base::out; break;
sl@0:   default:
sl@0:     return false;
sl@0:   }
sl@0:   _M_file_id = file_no;
sl@0: #elif defined (_STLP_USE_UNIX_EMULATION_IO) || defined (_STLP_USE_STDIO_IO)
sl@0:   (void)init_mode;    // dwa 4/27/00 - suppress unused parameter warning
sl@0:   int mode ;
sl@0:   struct STAT buf;
sl@0:   if (FSTAT(file_no, &buf) != 0)
sl@0:     return false;
sl@0:   mode = buf.st_mode;
sl@0: 
sl@0:   switch(mode & (_S_IWRITE | _S_IREAD) ) {
sl@0:   case _S_IREAD:
sl@0:     _M_openmode = ios_base::in; break;
sl@0:   case _S_IWRITE:
sl@0:     _M_openmode = ios_base::out; break;
sl@0:   case (_S_IWRITE | _S_IREAD):
sl@0:     _M_openmode = ios_base::in | ios_base::out; break;
sl@0:   default:
sl@0:     return false;
sl@0:   }
sl@0:   _M_file_id = file_no;
sl@0: #elif (defined (_STLP_USE_WIN32_IO) && defined (_STLP_MSVC_LIB) && !defined (_STLP_WCE) ) || \
sl@0:       (defined (__MINGW32__) && defined (__MSVCRT__)) || \
sl@0:        defined (__DMC__)
sl@0: 
sl@0:   HANDLE oshandle = (HANDLE)_get_osfhandle(file_no);
sl@0:   if (oshandle == INVALID_STLP_FD)
sl@0:     return false;
sl@0: 
sl@0:   if (init_mode != ios_base::__default_mode)
sl@0:     _M_openmode = init_mode;
sl@0:   else
sl@0:     _M_openmode = _get_osfflags(file_no, oshandle);
sl@0: 
sl@0:   _M_file_id = oshandle;
sl@0: #else
sl@0:   (void)init_mode;    // dwa 4/27/00 - suppress unused parameter warning
sl@0:   // not available for the API
sl@0: #  define _STLP_NO_IMPLEMENTATION
sl@0: #endif
sl@0: 
sl@0: #if !defined (_STLP_NO_IMPLEMENTATION)
sl@0:   _M_is_open = true;
sl@0:   _M_should_close = false;
sl@0:   _M_regular_file = _STLP_PRIV __is_regular_file(_M_file_id);
sl@0:   return true;
sl@0: #else
sl@0: #  undef _STLP_NO_IMPLEMENTATION
sl@0:   return false;
sl@0: #endif
sl@0: }
sl@0: 
sl@0: _STLP_DECLSPEC bool _Filebuf_base::_M_close() {
sl@0:   if (!_M_is_open)
sl@0:     return false;
sl@0: 
sl@0:   bool ok;
sl@0: 
sl@0:   if (!_M_should_close)
sl@0:     ok = true;
sl@0:   else {
sl@0: 
sl@0: #if defined (_STLP_USE_UNIX_IO)
sl@0: 
sl@0:     ok = (close(_M_file_id) == 0);
sl@0: 
sl@0: #elif defined (_STLP_USE_UNIX_EMULATION_IO)
sl@0: 
sl@0:     ok = (_close(_M_file_id) == 0);
sl@0: 
sl@0: #elif defined (_STLP_USE_STDIO_IO)
sl@0: 
sl@0:     ok = (fclose(_M_file) == 0);
sl@0: 
sl@0: #elif defined (_STLP_USE_WIN32_IO)
sl@0: 
sl@0:     if (_M_file_id != INVALID_STLP_FD) {
sl@0:       ok = (CloseHandle(_M_file_id) != 0);
sl@0:     }
sl@0:     else {
sl@0:       ok = false;
sl@0:     }
sl@0: 
sl@0: #else
sl@0: 
sl@0:     ok = false;
sl@0: 
sl@0: #endif /* _STLP_USE_UNIX_IO */
sl@0:   }
sl@0: 
sl@0:   _M_is_open = _M_should_close = false;
sl@0:   _M_openmode = 0;
sl@0:   return ok;
sl@0: }
sl@0: 
sl@0: 
sl@0: #define _STLP_LF 10
sl@0: #define _STLP_CR 13
sl@0: #define _STLP_CTRLZ 26
sl@0: 
sl@0: // Read up to n characters into a buffer.  Return value is number of
sl@0: // characters read.
sl@0: _STLP_DECLSPEC ptrdiff_t _Filebuf_base::_M_read(char* buf, ptrdiff_t n) {
sl@0: #if defined (_STLP_USE_UNIX_IO)
sl@0: 
sl@0:   return read(_M_file_id, buf, n);
sl@0: 
sl@0: #elif defined (_STLP_USE_UNIX_EMULATION_IO)
sl@0: 
sl@0:   return _read(_M_file_id, buf, n);
sl@0: 
sl@0: #elif defined (_STLP_USE_WIN32_IO)
sl@0:   ptrdiff_t readen = 0;
sl@0:   //Here cast to size_t is safe as n cannot be negative.
sl@0:   size_t chunkSize = (min)(size_t(0xffffffff), __STATIC_CAST(size_t, n));
sl@0:   // The following, while validating that we are still able to extract chunkSize
sl@0:   // charaters to the buffer, avoids extraction of too small chunk of datas
sl@0:   // which would be counter performant.
sl@0:   while (__STATIC_CAST(size_t, (n - readen)) >= chunkSize) {
sl@0:     DWORD NumberOfBytesRead;
sl@0:     ReadFile(_M_file_id, buf + readen, __STATIC_CAST(DWORD, chunkSize), &NumberOfBytesRead, 0);
sl@0: 
sl@0:     if (NumberOfBytesRead == 0)
sl@0:       break;
sl@0: 
sl@0:     if (!(_M_openmode & ios_base::binary)) {
sl@0:       // translate CR-LFs to LFs in the buffer
sl@0:       char *to = buf + readen;
sl@0:       char *from = to;
sl@0:       char *last = from + NumberOfBytesRead - 1;
sl@0:       for (; from <= last && *from != _STLP_CTRLZ; ++from) {
sl@0:         if (*from != _STLP_CR)
sl@0:           *to++ = *from;
sl@0:         else { // found CR
sl@0:           if (from < last) { // not at buffer end
sl@0:             if (*(from + 1) != _STLP_LF)
sl@0:               *to++ = _STLP_CR;
sl@0:           }
sl@0:           else { // last char is CR, peek for LF
sl@0:             char peek = ' ';
sl@0:             DWORD NumberOfBytesPeeked;
sl@0:             ReadFile(_M_file_id, (LPVOID)&peek, 1, &NumberOfBytesPeeked, 0);
sl@0:             if (NumberOfBytesPeeked != 0) {
sl@0:               if (peek != _STLP_LF) { //not a <CR><LF> combination
sl@0:                 *to++ = _STLP_CR;
sl@0:                 if ((to < buf + n) && (peek != _STLP_CR))
sl@0:                   //We have enough place to store peek and it is no a special
sl@0:                   //_STLP_CR character, we can store it.
sl@0:                   *to++ = peek;
sl@0:                 else
sl@0:                   SetFilePointer(_M_file_id, (LONG)-1, 0, SEEK_CUR);
sl@0:               }
sl@0:               else {
sl@0:                 // A <CR><LF> combination, we keep the <LF>:
sl@0:                 *to++ = _STLP_LF;
sl@0:               }
sl@0:             }
sl@0:             else {
sl@0:               /* This case is tedious, we could
sl@0:                *  - put peek back in the file but this would then generate an infinite loop
sl@0:                *  - report an error as we don't know if in a future call to ReadFile we won't then
sl@0:                *    get a <LF>. Doing so would make all files with a <CR> last an invalid file
sl@0:                *    for STLport, a hard solution for STLport clients.
sl@0:                *  - store the <CR> in the returned buffer, the chosen solution, even if in this
sl@0:                *    case we could miss a <CR><LF> combination.
sl@0:                */
sl@0:               *to++ = _STLP_CR;
sl@0:             }
sl@0:           }
sl@0:         } // found CR
sl@0:       } // for
sl@0:       // seek back to TEXT end of file if hit CTRL-Z
sl@0:       if (from <= last) // terminated due to CTRLZ
sl@0:         SetFilePointer(_M_file_id, (LONG)((last+1) - from), 0, SEEK_CUR);
sl@0:       readen += to - (buf + readen);
sl@0:     }
sl@0:     else
sl@0:       readen += NumberOfBytesRead;
sl@0:   }
sl@0:   return readen;
sl@0: 
sl@0: #elif defined (_STLP_USE_STDIO_IO)
sl@0: 
sl@0:   return fread(buf, 1, n, _M_file);
sl@0: 
sl@0: #else
sl@0: #  error "Port!"
sl@0: #endif /* __unix */
sl@0: }
sl@0: 
sl@0: // Write n characters from a buffer.  Return value: true if we managed
sl@0: // to write the entire buffer, false if we didn't.
sl@0: _STLP_DECLSPEC bool _Filebuf_base::_M_write(char* buf, ptrdiff_t n) {
sl@0:   for (;;) {
sl@0:     ptrdiff_t written;
sl@0: 
sl@0: #if defined (_STLP_USE_UNIX_IO)
sl@0: 
sl@0:     written = write(_M_file_id, buf, n);
sl@0: 
sl@0: #elif defined (_STLP_USE_UNIX_EMULATION_IO)
sl@0: 
sl@0:     written = _write(_M_file_id, buf, n);
sl@0: 
sl@0: #elif defined (_STLP_USE_WIN32_IO)
sl@0: 
sl@0:     //In the following implementation we are going to cast most of the ptrdiff_t
sl@0:     //values in size_t to work with coherent unsigned values. Doing so make code
sl@0:     //more simple especially in the min function call.
sl@0: 
sl@0:     // In append mode, every write does an implicit seek to the end
sl@0:     // of the file.
sl@0:     if (_M_openmode & ios_base::app)
sl@0:       _M_seek(0, ios_base::end);
sl@0: 
sl@0:     if (_M_openmode & ios_base::binary) {
sl@0:       // binary mode
sl@0:       size_t bytes_to_write = (size_t)n;
sl@0:       DWORD NumberOfBytesWritten;
sl@0:       written = 0;
sl@0:       for (; bytes_to_write != 0;) {
sl@0:         WriteFile(_M_file_id, buf + written,
sl@0:                   __STATIC_CAST(DWORD, (min)(size_t(0xffffffff), bytes_to_write)),
sl@0:                   &NumberOfBytesWritten, 0);
sl@0:         if (NumberOfBytesWritten == 0)
sl@0:           return false;
sl@0:         bytes_to_write -= NumberOfBytesWritten;
sl@0:         written += NumberOfBytesWritten;
sl@0:       }
sl@0:     }
sl@0:     else {
sl@0:       char textbuf[_TEXTBUF_SIZE + 1]; // extra 1 in case LF at end
sl@0:       char * nextblock = buf, * ptrtextbuf = textbuf;
sl@0:       char * endtextbuf = textbuf + _TEXTBUF_SIZE;
sl@0:       char * endblock = buf + n;
sl@0:       ptrdiff_t nextblocksize = (min) (n, (ptrdiff_t)_TEXTBUF_SIZE);
sl@0:       char * nextlf;
sl@0: 
sl@0:       while ( (nextblocksize > 0) &&
sl@0:               (nextlf = (char *)memchr(nextblock, _STLP_LF, nextblocksize)) != 0) {
sl@0:         ptrdiff_t linelength = nextlf - nextblock;
sl@0:         memcpy(ptrtextbuf, nextblock, linelength);
sl@0:         ptrtextbuf += linelength;
sl@0:         nextblock += (linelength + 1);
sl@0:         * ptrtextbuf ++ = _STLP_CR;
sl@0:         * ptrtextbuf ++ = _STLP_LF;
sl@0:         nextblocksize = (min) (ptrdiff_t(endblock - nextblock),
sl@0:                                (max) (ptrdiff_t(0), ptrdiff_t(endtextbuf - ptrtextbuf)));
sl@0:       }
sl@0:       // write out what's left, > condition is here since for LF at the end ,
sl@0:       // endtextbuf may get < ptrtextbuf ...
sl@0:       if (nextblocksize > 0) {
sl@0:         memcpy(ptrtextbuf, nextblock, nextblocksize);
sl@0:         ptrtextbuf += nextblocksize;
sl@0:         nextblock += nextblocksize;
sl@0:       }
sl@0:       // now write out the translated buffer
sl@0:       char * writetextbuf = textbuf;
sl@0:       for (size_t NumberOfBytesToWrite = (size_t)(ptrtextbuf - textbuf);
sl@0:            NumberOfBytesToWrite;) {
sl@0:         DWORD NumberOfBytesWritten;
sl@0:         WriteFile((HANDLE)_M_file_id, writetextbuf,
sl@0:                   __STATIC_CAST(DWORD, (min)(size_t(0xffffffff), NumberOfBytesToWrite)),
sl@0:                   &NumberOfBytesWritten, 0);
sl@0:         if (!NumberOfBytesWritten) // write shortfall
sl@0:           return false;
sl@0:         writetextbuf += NumberOfBytesWritten;
sl@0:         NumberOfBytesToWrite -= NumberOfBytesWritten;
sl@0:       }
sl@0:       // count non-translated characters
sl@0:       written = (nextblock - buf);
sl@0:     }
sl@0: 
sl@0: #elif defined (_STLP_USE_STDIO_IO)
sl@0: 
sl@0:     written = fwrite(buf, 1, n, _M_file);
sl@0: 
sl@0: #else
sl@0: #  error "Port!"
sl@0: #endif /* __unix */
sl@0: 
sl@0:     if (n == written)
sl@0:       return true;
sl@0:     else if (written > 0 && written < n) {
sl@0:       n -= written;
sl@0:       buf += written;
sl@0:     }
sl@0:     else
sl@0:       return false;
sl@0:   }
sl@0: }
sl@0: 
sl@0: 
sl@0: #ifdef _STLP_USE_WIN32_IO
sl@0: #  define STL_SEEK_SET FILE_BEGIN
sl@0: #  define STL_SEEK_CUR FILE_CURRENT
sl@0: #  define STL_SEEK_END FILE_END
sl@0: #else
sl@0: #  define STL_SEEK_SET SEEK_SET
sl@0: #  define STL_SEEK_CUR SEEK_CUR
sl@0: #  define STL_SEEK_END SEEK_END
sl@0: #endif
sl@0: 
sl@0: // Wrapper for lseek or the like.
sl@0: _STLP_DECLSPEC streamoff _Filebuf_base::_M_seek(streamoff offset, ios_base::seekdir dir) {
sl@0:   streamoff result = -1;
sl@0:   int whence;
sl@0: 
sl@0:   switch(dir) {
sl@0:   case ios_base::beg:
sl@0:     if (offset < 0 /* || offset > _M_file_size() */ )
sl@0:       return streamoff(-1);
sl@0:     whence = STL_SEEK_SET;
sl@0:     break;
sl@0:   case ios_base::cur:
sl@0:     whence = STL_SEEK_CUR;
sl@0:     break;
sl@0:   case ios_base::end:
sl@0:     if (/* offset > 0 || */  -offset > _M_file_size() )
sl@0:       return streamoff(-1);
sl@0:     whence = STL_SEEK_END;
sl@0:     break;
sl@0:   default:
sl@0:     return streamoff(-1);
sl@0:   }
sl@0: 
sl@0: #if defined (_STLP_USE_UNIX_IO) || defined (_STLP_USE_UNIX_EMULATION_IO)
sl@0: 
sl@0:   result = LSEEK(_M_file_id, offset, whence);
sl@0: 
sl@0: #elif defined (_STLP_USE_STDIO_IO)
sl@0: 
sl@0: #if defined (__SYMBIAN32__)
sl@0:   /* This function is a wrapper for lseek and expects to return the offset in bytes from the beginning of the file. 
sl@0:     It is used by tellg as well as tellp (for setting/getting the file pointer). 
sl@0:     We don't want to use fseek for that. */
sl@0:   if (FSEEK(_M_file, offset, whence) != 0)
sl@0: 	  return streamoff(-1);
sl@0: 	result = FTELL(_M_file);
sl@0: #else
sl@0:   result = FSEEK(_M_file, offset, whence);
sl@0: #endif
sl@0: 
sl@0: #elif defined (_STLP_USE_WIN32_IO)
sl@0: 
sl@0:   LARGE_INTEGER li;
sl@0:   li.QuadPart = offset;
sl@0:   li.LowPart = SetFilePointer(_M_file_id, li.LowPart, &li.HighPart, whence);
sl@0:   if (li.LowPart != INVALID_SET_FILE_POINTER || GetLastError() == NO_ERROR)
sl@0:     result = li.QuadPart;
sl@0: 
sl@0: #else
sl@0: #  error "Port!"
sl@0: #endif
sl@0: 
sl@0:   return result;
sl@0: }
sl@0: 
sl@0: 
sl@0: // Attempts to memory-map len bytes of the current file, starting
sl@0: // at position offset.  Precondition: offset is a multiple of the
sl@0: // page size.  Postcondition: return value is a null pointer if the
sl@0: // memory mapping failed.  Otherwise the return value is a pointer to
sl@0: // the memory-mapped file and the file position is set to offset.
sl@0: _STLP_DECLSPEC void* _Filebuf_base::_M_mmap(streamoff offset, streamoff len) {
sl@0:   void* base;
sl@0: #if defined (_STLP_UNIX) && !defined(__DJGPP) && !defined(_CRAY)
sl@0:   base = MMAP(0, len, PROT_READ, MAP_PRIVATE, _M_file_id, offset);
sl@0:   if (base != (void*)MAP_FAILED) {
sl@0:     if (LSEEK(_M_file_id, offset + len, SEEK_SET) < 0) {
sl@0:       this->_M_unmap(base, len);
sl@0:       base = 0;
sl@0:     }
sl@0:   } else
sl@0:     base =0;
sl@0: 
sl@0: #elif defined (_STLP_USE_WIN32_IO)
sl@0:   _M_view_id = CreateFileMapping(_M_file_id, (PSECURITY_ATTRIBUTES)0 ,
sl@0:                                  PAGE_READONLY, 0 /* len >> 32 */ ,
sl@0:                                  0 /* len & 0xFFFFFFFF */ , // low-order DWORD of size
sl@0:                                  0);
sl@0: 
sl@0:   if (_M_view_id) {
sl@0: #  if 0
sl@0: /*
sl@0:     printf("view %x created from file %x, error = %d, size = %d, map_offset = %d map_len = %d\n",
sl@0:      _M_view_id, _M_file_id, GetLastError(),
sl@0:      (int)cur_filesize, ULL(offset) & 0xffffffff, len);
sl@0: */
sl@0: #  endif
sl@0:     base = MapViewOfFile(_M_view_id, FILE_MAP_READ, __STATIC_CAST(DWORD, ULL(offset) >> 32),
sl@0:                          __STATIC_CAST(DWORD, ULL(offset) & 0xffffffff),
sl@0: #  if !defined (__DMC__)
sl@0:                          __STATIC_CAST(SIZE_T, len));
sl@0: #  else
sl@0:                          __STATIC_CAST(DWORD, len));
sl@0: #  endif
sl@0:     // check if mapping succeded and is usable
sl@0:     if (base == 0  || _M_seek(offset + len, ios_base::beg) < 0) {
sl@0:       this->_M_unmap(base, len);
sl@0:       base = 0;
sl@0:     }
sl@0:   } else
sl@0:     base = 0;
sl@0: #else
sl@0:   (void)len;    //*TY 02/26/2000 - unused variables
sl@0:   (void)offset;    //*TY 02/26/2000 -
sl@0:   base = 0;
sl@0: #endif
sl@0:   return base;
sl@0: }
sl@0: 
sl@0: _STLP_DECLSPEC void _Filebuf_base::_M_unmap(void* base, streamoff len) {
sl@0:   // precondition : there is a valid mapping at the moment
sl@0: #if defined (_STLP_UNIX)  && !defined(__DJGPP) && !defined(_CRAY)
sl@0:   munmap((char*)base, len);
sl@0: #elif defined (_STLP_USE_WIN32_IO)
sl@0:   if (base != NULL)
sl@0:     UnmapViewOfFile(base);
sl@0:   // destroy view handle as well
sl@0:   if (_M_view_id != NULL)
sl@0:     CloseHandle(_M_view_id);
sl@0:   _M_view_id = NULL;
sl@0:   (void)len; //unused variable
sl@0: #else
sl@0:   (void)len;    //*TY 02/26/2000 - unused variables
sl@0:   (void)base;   //*TY 02/26/2000 -
sl@0: #endif
sl@0: }
sl@0: 
sl@0: #if defined (__SYMBIAN32__) && defined(__EPOC32__)
sl@0: _STLP_DECLSPEC size_t _Filebuf_base::__page_size()
sl@0: {
sl@0: 	return _Filebuf_base::_M_page_size;
sl@0: }
sl@0: #endif
sl@0: // fbp : let us map 1 MB maximum, just be sure not to trash VM
sl@0: #define MMAP_CHUNK 0x100000L
sl@0: 
sl@0: _STLP_DECLSPEC int _STLP_CALL
sl@0: _Underflow<char, char_traits<char> >::_M_doit (basic_filebuf<char, char_traits<char> >* __this) {
sl@0:   if (!__this->_M_in_input_mode) {
sl@0:     if (!__this->_M_switch_to_input_mode())
sl@0:       return traits_type::eof();
sl@0:   }
sl@0:   else if (__this->_M_in_putback_mode) {
sl@0:     __this->_M_exit_putback_mode();
sl@0:     if (__this->gptr() != __this->egptr()) {
sl@0:       int_type __c = traits_type::to_int_type(*__this->gptr());
sl@0:       return __c;
sl@0:     }
sl@0:   }
sl@0: 
sl@0:   // If it's a disk file, and if the internal and external character
sl@0:   // sequences are guaranteed to be identical, then try to use memory
sl@0:   // mapped I/O.  Otherwise, revert to ordinary read.
sl@0:   if (__this->_M_base.__regular_file()
sl@0:       && __this->_M_always_noconv
sl@0:       && __this->_M_base._M_in_binary_mode()) {
sl@0:     // If we've mmapped part of the file already, then unmap it.
sl@0:     if (__this->_M_mmap_base)
sl@0:       __this->_M_base._M_unmap(__this->_M_mmap_base, __this->_M_mmap_len);
sl@0:     __this->_M_mmap_base = 0;
sl@0:     __this->_M_mmap_len = 0;
sl@0: 
sl@0:     // Determine the position where we start mapping.  It has to be
sl@0:     // a multiple of the page size.
sl@0:     streamoff __cur = __this->_M_base._M_seek(0, ios_base::cur);
sl@0:     streamoff __size = __this->_M_base._M_file_size();
sl@0:     if (__size > 0 && __cur >= 0 && __cur < __size) {
sl@0:       streamoff __offset = (__cur / __this->_M_base.__page_size()) * __this->_M_base.__page_size();
sl@0:       streamoff __remainder = __cur - __offset;
sl@0: 
sl@0:       __this->_M_mmap_len = __size - __offset;
sl@0: 
sl@0:       if (__this->_M_mmap_len > MMAP_CHUNK)
sl@0:         __this->_M_mmap_len = MMAP_CHUNK;
sl@0: 
sl@0:       if ((__this->_M_mmap_base =
sl@0:         __this->_M_base._M_mmap(__offset, __this->_M_mmap_len)) != 0) {
sl@0:         __this->setg((char*) __this->_M_mmap_base,
sl@0:                      (char*) __this->_M_mmap_base + __STATIC_CAST(ptrdiff_t, __remainder),
sl@0:                      (char*) __this->_M_mmap_base + __STATIC_CAST(ptrdiff_t, __this->_M_mmap_len));
sl@0:         return traits_type::to_int_type(*__this->gptr());
sl@0:       }
sl@0:     } else /* size > 0 ... */ {
sl@0:       // There is nothing to map. We unmapped the file above, now zap pointers.
sl@0:       __this->_M_mmap_base = 0;
sl@0:       __this->_M_mmap_len = 0;
sl@0:     }
sl@0:   }
sl@0: 
sl@0:   return __this->_M_underflow_aux();
sl@0: }
sl@0: 
sl@0: 
sl@0: //----------------------------------------------------------------------
sl@0: // Force instantiation of filebuf and fstream classes.
sl@0: #if !defined(_STLP_NO_FORCE_INSTANTIATE)
sl@0: 
sl@0: template class basic_filebuf<char, char_traits<char> >;
sl@0: template class basic_ifstream<char, char_traits<char> >;
sl@0: template class basic_ofstream<char, char_traits<char> >;
sl@0: template class basic_fstream<char, char_traits<char> >;
sl@0: 
sl@0: #  if !defined (_STLP_NO_WCHAR_T)
sl@0: template class _Underflow<wchar_t, char_traits<wchar_t> >;
sl@0: template class basic_filebuf<wchar_t, char_traits<wchar_t> >;
sl@0: template class basic_ifstream<wchar_t, char_traits<wchar_t> >;
sl@0: template class basic_ofstream<wchar_t, char_traits<wchar_t> >;
sl@0: template class basic_fstream<wchar_t, char_traits<wchar_t> >;
sl@0: #  endif /* _STLP_NO_WCHAR_T */
sl@0: 
sl@0: #endif
sl@0: 
sl@0: _STLP_END_NAMESPACE
sl@0: 
sl@0: // Local Variables:
sl@0: // mode:C++
sl@0: // End: