/*

 * 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"

#include "stdio_streambuf.h"

// #include "file_streambuf.h"

#ifdef _STLP_UNIX

#  include <sys/types.h>

#  include <sys/stat.h>

#endif /* __unix */

#include <fstream>

#include <limits>

#include "fstream_impl.h"

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

#  if defined (__BORLANDC__)

// #  include <cio.h>

#    include <cfcntl.h>

#  else

#    include <io.h>

#    include <fcntl.h>

#  endif

#  include <sys/stat.h>

#endif

_STLP_BEGIN_NAMESPACE

_STLP_MOVE_TO_PRIV_NAMESPACE

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

#ifdef _STLP_USE_DEFAULT_FILE_OFFSET

#  define FSEEK fseek

#  define FTELL ftell

#  define FSTAT fstat

#  define STAT  stat

#  define FSETPOS  fsetpos

#  define FGETPOS  fgetpos

#  define FPOS_T   fpos_t

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

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

#  define FSEEK fseeko64

#  define FTELL ftello64

#  define FSTAT fstat64

#  define STAT  stat64

#  define FSETPOS  fsetpos64

#  define FGETPOS  fgetpos64

#  define FPOS_T   fpos64_t

#else

#  define FSEEK fseek

#  define FTELL ftell

#  define FSTAT fstat

#  define STAT  stat

#  define FSETPOS  fsetpos

#  define FGETPOS  fgetpos

#  define FPOS_T   fpos_t

#endif

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

// Class stdio_streambuf_base

stdio_streambuf_base::stdio_streambuf_base(FILE* file)

    : /* _STLP_STD::FILE_basic_streambuf(file, 0), */

    _M_file(file)

{}

stdio_streambuf_base::~stdio_streambuf_base() {

  _STLP_VENDOR_CSTD::fflush(_M_file);

}

_STLP_STD::streambuf* stdio_streambuf_base::setbuf(char* s, streamsize n) {

#ifdef _STLP_WCE

  // no buffering in windows ce .NET

#else

  size_t __n_size_t = (sizeof(streamsize) > sizeof(size_t)) ? __STATIC_CAST(size_t, (min)(__STATIC_CAST(streamsize, (numeric_limits<size_t>::max)()), n))

                                                            : __STATIC_CAST(size_t, n);

  _STLP_VENDOR_CSTD::setvbuf(_M_file, s, (s == 0 && n == 0) ? _IONBF : _IOFBF, __n_size_t);

#endif

  return this;

}

stdio_streambuf_base::pos_type

stdio_streambuf_base::seekoff(off_type off, ios_base::seekdir dir,

                              ios_base::openmode /* mode */) {

  int whence;

  switch (dir) {

  case ios_base::beg:

    whence = SEEK_SET;

    break;

  case ios_base::cur:

    whence = SEEK_CUR;

    break;

  case ios_base::end:

    whence = SEEK_END;

    break;

  default:

    return pos_type(-1);

  }

  if (off <= numeric_limits<off_type>::max() && FSEEK(_M_file, off, whence) == 0) {

    FPOS_T pos;

    FGETPOS(_M_file, &pos);

    // added 21 june 00 mdb,rjf,wjs: glibc 2.2 changed fpos_t to be a struct instead

    // of a primitive type

#if (defined (__GLIBC__) && ((__GLIBC__ > 2) || ((__GLIBC__ == 2) && (__GLIBC_MINOR__ >= 2))))

    return pos_type((streamoff)pos.__pos);

#elif defined (__ISCPP__) || defined (__MVS__) || defined (__OS400__)

    return pos_type(pos.__fpos_elem[ 0 ]);

#elif defined (__EMX__)

    return pos_type((streamoff)pos._pos);

#else

    return pos_type(pos);

#endif

  }

  else

    return pos_type(-1);

}

stdio_streambuf_base::pos_type

stdio_streambuf_base::seekpos(pos_type pos, ios_base::openmode /* mode */) {

  // added 21 june 00 mdb,rjf,wjs: glibc 2.2 changed fpos_t to be a struct instead

  // of a primitive type

#if (defined(__GLIBC__) && ( (__GLIBC__ > 2) || ( (__GLIBC__ == 2) && (__GLIBC_MINOR__ >= 2) ) ) )

  FPOS_T p;

  p.__pos = pos;

#  ifdef _STLP_USE_UCLIBC

#    ifdef __STDIO_MBSTATE

  memset( &(p.__mbstate), 0, sizeof(p.__mbstate) );

#    endif

#    ifdef __STDIO_WIDE

  p.mblen_pending = 0;

#    endif

#  else

  memset( &(p.__state), 0, sizeof(p.__state) );

#  endif

#elif defined (__MVS__) || defined (__OS400__)

  FPOS_T p;

  p.__fpos_elem[0] = pos;

#elif defined(__EMX__)

  FPOS_T p;

  p._pos = pos;

  memset( &(p._mbstate), 0, sizeof(p._mbstate) );

#else

  FPOS_T p(pos);

#endif

  return FSETPOS(_M_file, &p) == 0 ? pos : pos_type(-1);

}

int stdio_streambuf_base::sync() {

  return _STLP_VENDOR_CSTD::fflush(_M_file) == 0 ? 0 : -1;

}

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

// Class stdio_istreambuf

stdio_istreambuf::~stdio_istreambuf() {}

streamsize stdio_istreambuf::showmanyc() {

  if (feof(_M_file))

    return -1;

  else {

#ifdef __SYMBIAN32__

	  int fd = fileno(_M_file);

#else

    int fd = _FILE_fd(_M_file);

#endif

#ifdef _STLP_WCE

   (fd); // prevent warning about unused variable

// not sure if i can mix win32 io mode with ftell but time will show

// cannot use WIN32_IO implementation since missing stat

    streamsize tmp = FTELL(_M_file);

    FSEEK(_M_file, 0, SEEK_END);

    streamoff size= FTELL(_M_file)-tmp;

    FSEEK(_M_file, tmp, SEEK_SET);

#elif defined (_STLP_USE_WIN32_IO)

    // in this case, __file_size works with Win32 fh , not libc one

    streamoff size;

    struct stat buf;

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

      size = ( buf.st_size > 0  ? buf.st_size : 0);

    else

      size = 0;

#else

    streamoff size = __file_size(fd);

#endif

    // fbp : we can use ftell as this flavour always use stdio.

    streamsize pos = FTELL(_M_file);

    return pos >= 0 && size > pos ? size - pos : 0;

  }

}

stdio_istreambuf::int_type stdio_istreambuf::underflow()

{

#ifdef _STLP_WCE

  int c = fgetc(_M_file);

#else

  int c = getc(_M_file);

#endif

  if (c != EOF) {

    _STLP_VENDOR_CSTD::ungetc(c, _M_file);

    return c;

  }

  else

    return traits_type::eof();

}

stdio_istreambuf::int_type stdio_istreambuf::uflow() {

#ifdef _STLP_WCE

  int c = fgetc(_M_file);

#else

  int c = getc(_M_file);

#endif

  return c != EOF ? c : traits_type::eof();

}

stdio_istreambuf::int_type stdio_istreambuf::pbackfail(int_type c) {

  if (c != traits_type::eof()) {

    int result = _STLP_VENDOR_CSTD::ungetc(c, _M_file);

    return result != EOF ? result : traits_type::eof();

  }

  else{

    if (this->eback() < this->gptr()) {

      this->gbump(-1);

      return traits_type::not_eof(c);

    }

    else

      return traits_type::eof();

  }

}

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

// Class stdio_ostreambuf

stdio_ostreambuf::~stdio_ostreambuf() {}

streamsize stdio_ostreambuf::showmanyc() {

  return -1;

}

stdio_ostreambuf::int_type stdio_ostreambuf::overflow(int_type c) {

  // Write the existing buffer, without writing any additional character.

  if (c == traits_type::eof()) {

    // Do we have a buffer to write?

    ptrdiff_t unwritten = this->pptr() - this->pbase();

    if (unwritten != 0) {

      _STLP_VENDOR_CSTD::fflush(_M_file);

      // Test if the write succeeded.

      if (this->pptr() - this->pbase() < unwritten)

        return traits_type::not_eof(c);

      else

        return traits_type::eof();

    }

    // We always succeed if we don't have to do anything.

    else

      return traits_type::not_eof(c);

  }

  // Write the character c, and whatever else might be in the buffer.

  else {

#ifdef _STLP_WCE

    int result = fputc(c, _M_file);

#else

    int result = putc(c, _M_file);

#endif

    return result != EOF ? result : traits_type::eof();

  }

}

_STLP_MOVE_TO_STD_NAMESPACE

_STLP_END_NAMESPACE

// Local Variables:

// mode:C++

// End: