fstream

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// -*- C++ -*-
/***************************************************************************
 *
 * fstream -- Declarations for the Standard Library file bufs and streams
 *
 * $Id: fstream,v 1.1.1.1 2002/01/10 17:38:29 vkorstan Exp $
 *
 ***************************************************************************
 *
 * Copyright (c) 1994-2001 Rogue Wave Software, Inc.  All Rights Reserved.
 *
 * This computer software is owned by Rogue Wave Software, Inc. and is
 * protected by U.S. copyright laws and other laws and by international
 * treaties.  This computer software is furnished by Rogue Wave Software,
 * Inc. pursuant to a written license agreement and may be used, copied,
 * transmitted, and stored only in accordance with the terms of such
 * license and with the inclusion of the above copyright notice.  This
 * computer software or any other copies thereof may not be provided or
 * otherwise made available to any other person.
 *
 * U.S. Government Restricted Rights.  This computer software is provided
 * with Restricted Rights.  Use, duplication, or disclosure by the
 * Government is subject to restrictions as set forth in subparagraph (c)
 * (1) (ii) of The Rights in Technical Data and Computer Software clause
 * at DFARS 252.227-7013 or subparagraphs (c) (1) and (2) of the
 * Commercial Computer Software--Restricted Rights at 48 CFR 52.227-19,
 * as applicable.  Manufacturer is Rogue Wave Software, Inc., 5500
 * Flatiron Parkway, Boulder, Colorado 80301 USA.
 *
 **************************************************************************/

#ifndef _RWSTD_FSTREAM_INCLUDED
#define _RWSTD_FSTREAM_INCLUDED

#include <iosfwd>

#ifndef _RWSTD_NO_REDUNDANT_DEFINITIONS
#  include <istream>
#  include <ostream>
#endif   // _RWSTD_NO_REDUNDANT_DEFINITIONS

#include <rw/_codecvt.h>
#include <rw/_file.h>
#include <rw/_iosbase.h>
#include <rw/_defs.h>

#include _RWSTD_CSTDLIB


#define _RWSTD_INVALID_FPOS   pos_type (off_type (-1))
#define _RWSTD_PBACK_SIZE     streamsize (4)

_RWSTD_NAMESPACE_BEGIN (std)


template<class _CharT, class _Traits>
class basic_filebuf: public basic_streambuf<_CharT, _Traits>
{
public:
    typedef _CharT                          char_type;
    typedef _Traits                         traits_type;
    typedef _TYPENAME traits_type::int_type int_type;
    typedef _TYPENAME traits_type::pos_type pos_type;
    typedef _TYPENAME traits_type::off_type off_type;

    // 27.8.1.2, p1
    basic_filebuf ()
        : basic_streambuf<_CharT, _Traits> (),
          _C_file (_RWSTD_INVALID_FILE),
          _C_cur_pos (_RWSTD_INVALID_FPOS),
          _C_beg_pos (_RWSTD_INVALID_FPOS),
          _C_pbacksize (0) {
        setbuf (0, _RWSTD_DEFAULT_BUFSIZE);
    }

#if     defined (_RWSTD_NO_EXT_FILEBUF)            \
    && !defined (_RWSTD_NO_STATIC_IOSTREAM_INIT)   \
    && (!defined (__GNUG__) || _GNUC_MINOR > 96)

private:

    // g++ 2.95 error: `std::ios_base::Init' does not declare a template type
    friend class ios_base::Init;

#endif   // _RWSTD_NO_EXT_FILEBUF && !_RWSTD_NO_STATIC_IOSTREAM_INIT

    // ctor extensions - associate this with an open file and
    // optionally set buffer size and caller-allocated buffer
    // NOTE: passed in buffer will NOT be deallocated
    _EXPLICIT
    basic_filebuf (int __fd, char_type* __buf   = 0,
                   streamsize __bufsz = _RWSTD_DEFAULT_BUFSIZE)
        : basic_streambuf<char_type, traits_type>
    (_RW::__rw_file_t::_C_get_mode (__fd)),
        _C_file    (__fd),
        _C_cur_pos (_RWSTD_INVALID_FPOS),
        _C_beg_pos (_RWSTD_INVALID_FPOS),
        _C_pbacksize (0) {
        setbuf (__buf, __bufsz);
    }

public:

#ifndef _RWSTD_NO_EXT_FILEBUF

    _EXPLICIT
    basic_filebuf (FILE *__fptr, char_type* __bf = 0,
                   streamsize __bfsz = _RWSTD_DEFAULT_BUFSIZE)
        : basic_streambuf<char_type, traits_type >
    (_RW::__rw_file_t::_C_get_mode (__fptr)),
        _C_file (__fptr),
        _C_cur_pos (_RWSTD_INVALID_FPOS),
        _C_beg_pos (_RWSTD_INVALID_FPOS),
        _C_pbacksize (0) {
        setbuf (__bf,__bfsz);
    }

#endif //_RWSTD_NO_EXT_FILEBUF

    // 27.8.1.2, p3
    virtual ~basic_filebuf ();

    // 27.8.1.3, p2 (last optional argument is an extension)
    basic_filebuf<char_type, traits_type>*
    open (const char *__name, ios_base::openmode, long __prot = 0666);
    
#ifndef _RWSTD_NO_EXT_FILEBUF

    // extensions - associate this with an open file and
    // optionally set buffer size and caller-allocated buffer
    // NOTE: passed in buffer will NOT be deallocated

    basic_filebuf<char_type, traits_type>*
    open (int __fd, char_type *__buf = 0,
          streamsize __bufsz = _RWSTD_DEFAULT_BUFSIZE) {
        return (_C_open (__fd, __buf, __bufsz));
    }

    basic_filebuf<char_type, traits_type>*
    open (FILE *__fptr, char_type *__buf = 0,
          streamsize __bufsz = _RWSTD_DEFAULT_BUFSIZE) {
        return (_C_open (__fptr, __buf, __bufsz));
    }
    
    // extension - return the file descriptor.
    int fd () const {
        return _C_file._C_get_fd ( );
    }

#endif //_RWSTD_NO_EXT_FILEBUF
    
    // 27.8.1.3, p6
    basic_filebuf<char_type, traits_type>* close ();

    // 27.8.1.3, p1
    bool is_open () const {
        return _C_file._C_is_open ();
    }

protected:

    // 27.8.1.4, p1
    virtual streamsize showmanyc ();

    // 27.8.1.4, p3
    virtual int_type underflow ();

    // 27.8.1.4, p4
    virtual int_type uflow ();

    // 27.8.1.4, p8
    virtual int_type overflow (int_type = traits_type::eof ());

    // 27.8.1.4, p5
    virtual int_type pbackfail (int_type = traits_type::eof ());

    // 27.8.1.4, p10 
    //   setbuf (0, 0) sets unbuffered mode (safe to use at any time)
    //   setbuf (0, N) sets buffered mode with internal buffer of size N
    //   setbuf (b, N) set buffered mode with user-allocated buffer `b'
    //                 of size `N' (user responsible for deallocation)
    virtual basic_streambuf<char_type,traits_type>* 
    setbuf (char_type*, streamsize);
 
    // 27.8.1.4, p11
    virtual pos_type seekoff (off_type, ios_base::seekdir, ios_base::openmode =
                              ios_base::in | ios_base::out);

    // 27.8.1.4, p14
    virtual pos_type seekpos (pos_type, ios_base::openmode =
                              ios_base::in | ios_base::out);

    // 27.8.1.4, p16 - in input mode, repopulates buffer from file
    virtual int sync ();

    virtual streamsize xsputn (const char_type*, streamsize);

private:

    // for convenience
    typedef _TYPENAME traits_type::state_type    state_type;
    typedef codecvt<char_type, char, state_type> _C_codecvt_t;

    basic_filebuf<char_type, traits_type>*
    _C_open (_RW::__rw_file_t, char_type* = 0,
             streamsize = _RWSTD_DEFAULT_BUFSIZE);

    pos_type _C_file_seek (off_type __off, int __way) {
        return _C_file._C_seek (__off, __way);
    }

    // count newlines in char sequence to handle CR/LF translation on win32
    // calculates seek offsets in external representation
    off_type _C_crlf_extern_count (const char*, const char*) const;
    
    // calculates seek offsets in internal representation
    off_type _C_crlf_intern_count (const char_type*, const char_type*) const;

    // write unshift sequence to file (multibyte, state-dependent encondings)
    bool _C_unshift ();
    
    _RW::__rw_file_t _C_file;        // underlying FILE ptr or file descriptor
    pos_type         _C_cur_pos;     // offset/state in file corresponding to
                                     //  end of buffer, and actual pos in file 
    pos_type         _C_beg_pos;     // offset/state in file corresponding to
                                     //  beginning of buffer 
    streamsize       _C_pbacksize;   // current size of putback area
};


template<class _CharT, class _Traits>
inline basic_filebuf<_CharT, _Traits>::~basic_filebuf ()
{
    close ();

    if (this->_C_own_buf ())
        delete [] this->_C_buffer;
}


template<class _CharT, class _Traits>
inline _TYPENAME basic_filebuf<_CharT, _Traits>::off_type
basic_filebuf<_CharT, _Traits>::
_C_crlf_extern_count (const char* __start, const char* __finish) const
{
    off_type __n = 0;

#ifdef _RWSTD_CRLF_CONVENTION

    if (!(this->_C_iomode & ios_base::binary)) {
        while (__start != __finish)
            if (traits_type::eq ('\n', *__start++))
                ++__n;
    }

#else   // if !defined (_RWSTD_CRLF_CONVENTION)

    _RWSTD_UNUSED (__start);
    _RWSTD_UNUSED (__finish);

#endif   // _RWSTD_CRLF_CONVENTION

    return __n;
}


template<class _CharT, class _Traits>
inline _TYPENAME basic_filebuf<_CharT, _Traits>::off_type
basic_filebuf<_CharT, _Traits>::
_C_crlf_intern_count (const char_type* __start,
		      const char_type* __finish) const
{
    off_type __n = 0;

#ifdef _RWSTD_CRLF_CONVENTION

    if (!(this->_C_iomode & ios_base::binary)) {
        const char_type __eol = _USE_FACET (ctype<char_type>,
                                            this->getloc ()).widen ('\n');
        while (__start != __finish)
            if (traits_type::eq (__eol, *__start++))
                ++__n;
    }
#else   // if !defined (_RWSTD_CRLF_CONVENTION)

    _RWSTD_UNUSED (__start);
    _RWSTD_UNUSED (__finish);

#endif   // _RWSTD_CRLF_CONVENTION

    return __n;
}