ios

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// -*- C++ -*-
/***************************************************************************
 *
 * ios - Declarations for the Standard Library basic stream I/O
 *
 * $Id: ios,v 1.3 2002/11/19 16:45:10 agrant 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_IOS_INCLUDED
#define _RWSTD_IOS_INCLUDED

#include <iosfwd>

#ifndef _RWSTD_NO_REDUNDANT_DEFINITIONS
#  include <streambuf>
#endif   // _RWSTD_NO_REDUNDANT_DEFINITIONS

#include <rw/_ctype.h>
#include <rw/_iosbase.h>
#include <rw/_defs.h>


_RWSTD_NAMESPACE_BEGIN (std)


template<class _CharT, class _Traits>
class basic_ios: public ios_base
{ 
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;

protected:

    typedef basic_streambuf<char_type, traits_type> streambuf_type; 
    typedef basic_ostream<char_type, traits_type>   ostream_type;

public:

    // 27.4.4.1, p1 - NOTE: `sb' may point to a yet uninitialized
    //  object; it is unsafe to reference any of its members
    _EXPLICIT basic_ios (streambuf_type *__sb) {
        init (__sb);
    }

    // 27.4.4.3, p1
    operator void*() const {
        return fail () ? (void*)0 : (void*)1;
    }

    // 27.4.4.3, p2
    bool operator! () const {
        return fail ();
    }

    // 27.4.4.3, p3
    iostate rdstate () const {
        return _C_state;
    }

    // extension - throws only exceptions in `mask'
    iostate clear (iostate __st, iostate __mask);

    // 27.4.4.3, p4
    void clear (iostate __st = goodbit) {
        clear (__st, ~0);
    }

    // extension - throws only exceptions in `mask'
    iostate setstate (iostate __st, iostate __mask) {
        return clear (rdstate () | __st, __mask);
    }

    // 27.4.4.3, p6
    void setstate (iostate __st) {
        clear (rdstate () | __st);
    }

    // 27.4.4.3, p7
    bool good () const {
        return goodbit == rdstate ();
    }

    // 27.4.4.3, p8
    bool eof () const {
        return 0 != (rdstate () & eofbit);
    }

    // 27.4.4.3, p9
    bool fail () const {
        return 0 != (rdstate () & (failbit | badbit));
    }

    // 27.4.4.3, p10
    bool bad () const {
        return 0 != (rdstate () & badbit);
    }

    // 27.4.4.3, p11
    iostate exceptions () const {
        return _C_except;
    }

    // 27.4.4.3, p12
    void exceptions (iostate);

    // 27.4.4.2, p1
    ostream_type* tie () const {
        return _C_tiestrm;
    }

    // 27.4.4.2, p2
    ostream_type* tie (ostream_type *__strm) {
        return _RWSTD_ATOMIC_IO_SWAP (_C_tiestrm, __strm, this->_C_mutex);
    }

    // 27.4.4.2, p4 - NOTE: the pointer returned from rdbuf() in derived
    // classes may be different from the one passed to rdbuf (streambuf_type*)
    streambuf_type* rdbuf () const {
        return _C_strmbuf;
    }

    // 27.4.4.2, p5
    streambuf_type* rdbuf (streambuf_type*);

    // 27.4.4.2, p15
    basic_ios& copyfmt (const basic_ios&);

    // 27.4.4.2, p12
    char_type fill () const {
        return _C_fillch;
    }

    // 27.4.4.2, p13
    char_type fill (char_type __c) {
        return _RWSTD_ATOMIC_IO_SWAP (_C_fillch, __c, this->_C_mutex);
    }

    // 27.4.4.2, p8
    locale imbue (const locale&);

    // 27.4.4.2, p10
    char narrow (char_type __c, char __dflt) const {
        return _USE_FACET (ctype<char_type>, getloc ()).narrow (__c, __dflt);
    }

    // 27.4.4.2, p11
    char_type widen (char __c) const {
        return _USE_FACET (ctype<char_type>, getloc ()).widen (__c);
    }

protected:

    // initialization of standard iostream objects may depend on
    // the default ctor not to re-initialize the object
    basic_ios () { /* no-op as per 27.4.4.1, p2 */ }

    // 27.4.4.1, p3
    void init (streambuf_type*);

    // (conditionally) returns a pointer to a mutex in the associated
    // basic_streambuf object
    _RW::__rw_mutex* _C_bufmutex () const;

private:

    basic_ios (const basic_ios&);              //  not defined
    basic_ios& operator= (const basic_ios&);   //  not defined

    streambuf_type *_C_strmbuf;   // pointer to associated streambuf object
    ostream_type   *_C_tiestrm;   // pointer to tied stream
    char_type       _C_fillch;    // fill character (space by default)
};


// ios_base::iostate rather ios::iostate used here to make MSVC 6.3 happy
template<class _CharT, class _Traits>
inline ios_base::iostate
basic_ios<_CharT, _Traits>::clear (ios_base::iostate __st   /* = goodbit */,
                                   ios_base::iostate __mask /* = ~0      */)
{
    _RWSTD_MT_GUARD (flags () & _RWSTD_IOS_NOLOCK ? 0 : &_C_mutex);

    return _C_unsafe_clear (rdbuf () ? __st : __st | badbit, __mask);
}


template<class _CharT, class _Traits>
inline void basic_ios<_CharT, _Traits>::exceptions (iostate __ex)
{
    _RWSTD_MT_GUARD (flags () & _RWSTD_IOS_NOLOCK ? 0 : &_C_mutex);

    _C_except = __ex;

    _C_unsafe_clear (rdbuf () ? rdstate () : rdstate () | badbit);
}


template<class _CharT, class _Traits>
inline _TYPENAME basic_ios<_CharT, _Traits>::streambuf_type* 
basic_ios<_CharT, _Traits>::rdbuf (streambuf_type *__sb)
{
    _RWSTD_MT_GUARD (flags () & _RWSTD_IOS_NOLOCK ? 0 : &_C_mutex);

    streambuf_type *__tmp = _C_strmbuf;

    // 27.4.4.3, p4 - set badbit if buffer pointer is 0
    _C_unsafe_clear (0 != (_C_strmbuf = __sb) ? goodbit : badbit);

    return __tmp;
}


template<class _CharT, class _Traits>
inline locale basic_ios<_CharT, _Traits>::imbue (const locale& __loc)
{
    _RWSTD_MT_GUARD (flags () & _RWSTD_IOS_NOLOCK ? 0 : &_C_mutex);

    locale __tmp = _C_unsafe_imbue (__loc);

    if (rdbuf ())
        rdbuf()->pubimbue (__loc);

    return __tmp;
}


template<class _CharT, class _Traits>
inline _RW::__rw_mutex* basic_ios<_CharT, _Traits>::_C_bufmutex () const
{
    _RWSTD_ASSERT (0 != rdbuf ());

#if !defined (_RWSTD_MULTI_THREAD) || defined (_RWSTD_NO_EXT_REENTRANT_IO)

    // unconditionally return pointer to buffer's mutex
    // (real or fake if not in an MT environment)
    return &rdbuf ()->_C_mutex;

#else

    // return pointer to buffer's mutex unless the object is in
    // a state where buffer locking is disabled)
    return flags () & _RWSTD_IOS_NOLOCKBUF ? 0 : &rdbuf ()->_C_mutex;

#endif   // !_RWSTD_MULTI_THREAD || !_RWSTD_NO_EXT_REENTRANT_IO
}


_RWSTD_NAMESPACE_END   // std


#if _RWSTD_DEFINE_TEMPLATE (BASIC_IOS)
#  include <ios.cc>
#endif


_RWSTD_NAMESPACE_BEGIN (std)

_RWSTD_INSTANTIATE_2 (class _RWSTD_EXPORT
                      basic_ios<char, char_traits<char> >);

#ifndef _RWSTD_NO_WCHAR_T
_RWSTD_INSTANTIATE_2 (class _RWSTD_EXPORT
                      basic_ios<wchar_t, char_traits<wchar_t> >);
#endif   // _RWSTD_NO_WCHAR_T

_RWSTD_NAMESPACE_END   // std


#endif   // _RWSTD_IOS_INCLUDED