williamr@2: /*
williamr@2:  * Copyright (c) 1999
williamr@2:  * Silicon Graphics Computer Systems, Inc.
williamr@2:  *
williamr@4:  * Copyright (c) 1999
williamr@2:  * Boris Fomitchev
williamr@2:  *
williamr@2:  * This material is provided "as is", with absolutely no warranty expressed
williamr@2:  * or implied. Any use is at your own risk.
williamr@2:  *
williamr@4:  * Permission to use or copy this software for any purpose is hereby granted
williamr@2:  * without fee, provided the above notices are retained on all copies.
williamr@2:  * Permission to modify the code and to distribute modified code is granted,
williamr@2:  * provided the above notices are retained, and a notice that the code was
williamr@2:  * modified is included with the above copyright notice.
williamr@2:  *
williamr@4:  */
williamr@2: // WARNING: This is an internal header file, included by other C++
williamr@2: // standard library headers.  You should not attempt to use this header
williamr@2: // file directly.
williamr@2: 
williamr@2: 
williamr@2: #ifndef _STLP_INTERNAL_ISTREAMBUF_ITERATOR_H
williamr@2: #define _STLP_INTERNAL_ISTREAMBUF_ITERATOR_H
williamr@2: 
williamr@2: #ifndef _STLP_INTERNAL_ITERATOR_BASE_H
williamr@2: # include <stl/_iterator_base.h>
williamr@2: #endif
williamr@2: 
williamr@2: #ifndef _STLP_INTERNAL_STREAMBUF
williamr@2: # include <stl/_streambuf.h>
williamr@2: #endif
williamr@2: 
williamr@2: _STLP_BEGIN_NAMESPACE
williamr@2: 
williamr@2: // defined in _istream.h
williamr@2: template <class _CharT, class _Traits>
williamr@2: extern basic_streambuf<_CharT, _Traits>* _STLP_CALL _M_get_istreambuf(basic_istream<_CharT, _Traits>& ) ;
williamr@2: 
williamr@4: // We do not read any characters until operator* is called. operator* calls sgetc
williamr@2: // unless the iterator is unchanged from the last call in which case a cached value is
williamr@2: // used. Calls to operator++ use sbumpc.
williamr@2: 
williamr@2: template<class _CharT, class _Traits>
williamr@4: class istreambuf_iterator :
williamr@4:   public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, _CharT*, _CharT&>
williamr@2: {
williamr@2: public:
williamr@2:   typedef _CharT                           char_type;
williamr@2:   typedef _Traits                          traits_type;
williamr@2:   typedef typename _Traits::int_type       int_type;
williamr@2:   typedef basic_streambuf<_CharT, _Traits> streambuf_type;
williamr@2:   typedef basic_istream<_CharT, _Traits>   istream_type;
williamr@2: 
williamr@2:   typedef input_iterator_tag               iterator_category;
williamr@2:   typedef _CharT                           value_type;
williamr@2:   typedef typename _Traits::off_type       difference_type;
williamr@2:   typedef const _CharT*                    pointer;
williamr@2:   typedef const _CharT&                    reference;
williamr@2: 
williamr@2: public:
williamr@2:   istreambuf_iterator(streambuf_type* __p = 0) { this->_M_init(__p); }
williamr@2:   //  istreambuf_iterator(basic_istream<_CharT, _Traits>& __is) { this->_M_init(_M_get_istreambuf(__is)); }
williamr@2:   inline istreambuf_iterator(basic_istream<_CharT, _Traits>& __is);
williamr@2: 
williamr@2:   char_type operator*() const { this->_M_getc(); return _M_c; }
williamr@4:   istreambuf_iterator<_CharT, _Traits>& operator++()
williamr@4:       {
williamr@4:         _M_buf->sbumpc();
williamr@4:         _M_have_c = false;
williamr@4:         return *this;
williamr@4:       }
williamr@2:   istreambuf_iterator<_CharT, _Traits>  operator++(int);
williamr@2: 
williamr@2:   bool equal(const istreambuf_iterator<_CharT, _Traits>& __i) const {
williamr@2:     if (this->_M_buf)
williamr@2:       this->_M_getc();
williamr@2:     if (__i._M_buf)
williamr@4:       __i._M_getc();
williamr@2:     return this->_M_eof == __i._M_eof;
williamr@2:   }
williamr@2: 
williamr@2: private:
williamr@2:   void _M_init(streambuf_type* __p) {
williamr@2:     _M_buf = __p;
williamr@4:     _M_eof = (__p == 0);
williamr@2:     _M_have_c = false;
williamr@2:   }
williamr@2: 
williamr@2:   void _M_getc() const {
williamr@2:     if (_M_have_c)
williamr@2:       return;
williamr@2:     int_type __c = _M_buf->sgetc();
williamr@2: # if !defined (_STLP_NEED_MUTABLE) /* && ! defined (__SUNPRO_CC) */
williamr@2:     _M_c = traits_type::to_char_type(__c);
williamr@2:     _M_eof = traits_type::eq_int_type(__c, traits_type::eof());
williamr@2:     _M_have_c = true;
williamr@2: # else
williamr@2:     typedef istreambuf_iterator<_CharT,_Traits> _Self;
williamr@2:     _Self* __that = __CONST_CAST(_Self*, this);
williamr@2:     __that->_M_c = __STATIC_CAST(_CharT, traits_type::to_char_type(__c));
williamr@2:     __that->_M_eof = traits_type::eq_int_type(__c, traits_type::eof());
williamr@2:     __that->_M_have_c = true;
williamr@2: # endif
williamr@2:   }
williamr@2: 
williamr@2: private:
williamr@2:   streambuf_type* _M_buf;
williamr@2:   mutable _CharT _M_c;
williamr@4:   mutable bool _M_eof;
williamr@4:   mutable bool _M_have_c;
williamr@2: };
williamr@2: 
williamr@2: template<class _CharT, class _Traits>
williamr@4: inline istreambuf_iterator<_CharT, _Traits>::istreambuf_iterator(basic_istream<_CharT, _Traits>& __is)
williamr@2: { this->_M_init(_M_get_istreambuf(__is)); }
williamr@2: 
williamr@2: template<class _CharT, class _Traits>
williamr@2: inline bool _STLP_CALL operator==(const istreambuf_iterator<_CharT, _Traits>& __x,
williamr@2:                                   const istreambuf_iterator<_CharT, _Traits>& __y) {
williamr@2:   return __x.equal(__y);
williamr@2: }
williamr@2: 
williamr@2: #ifdef _STLP_USE_SEPARATE_RELOPS_NAMESPACE
williamr@2: 
williamr@2: template<class _CharT, class _Traits>
williamr@2: inline bool _STLP_CALL operator!=(const istreambuf_iterator<_CharT, _Traits>& __x,
williamr@2:                                   const istreambuf_iterator<_CharT, _Traits>& __y) {
williamr@2:   return !__x.equal(__y);
williamr@2: }
williamr@2: 
williamr@2: #endif /* _STLP_USE_SEPARATE_RELOPS_NAMESPACE */
williamr@2: 
williamr@2: # if defined (_STLP_USE_TEMPLATE_EXPORT)
williamr@2: _STLP_EXPORT_TEMPLATE_CLASS istreambuf_iterator<char, char_traits<char> >;
williamr@2: #  if defined (INSTANTIATE_WIDE_STREAMS)
williamr@2: _STLP_EXPORT_TEMPLATE_CLASS istreambuf_iterator<wchar_t, char_traits<wchar_t> >;
williamr@2: #  endif
williamr@2: # endif /* _STLP_USE_TEMPLATE_EXPORT */
williamr@2: 
williamr@2: # ifdef _STLP_USE_OLD_HP_ITERATOR_QUERIES
williamr@2: template <class _CharT, class _Traits>
williamr@2: inline input_iterator_tag _STLP_CALL iterator_category(const istreambuf_iterator<_CharT, _Traits>&) { return input_iterator_tag(); }
williamr@2: template <class _CharT, class _Traits>
williamr@4: inline streamoff* _STLP_CALL
williamr@2: distance_type(const istreambuf_iterator<_CharT, _Traits>&) { return (streamoff*)0; }
williamr@2: template <class _CharT, class _Traits>
williamr@2: inline _CharT* _STLP_CALL value_type(const istreambuf_iterator<_CharT, _Traits>&) { return (_CharT*)0; }
williamr@2: # endif
williamr@2: 
williamr@2: template <class _CharT, class _Traits>
williamr@2: istreambuf_iterator<_CharT, _Traits>
williamr@2: istreambuf_iterator<_CharT, _Traits>::operator++(int) {
williamr@4:   _M_getc(); // __tmp should avoid any future actions under
williamr@4:   // underlined buffer---during call of operator *()
williamr@4:   // (due to buffer for *this and __tmp are the same).
williamr@2:   istreambuf_iterator<_CharT, _Traits> __tmp = *this;
williamr@4:   _M_buf->sbumpc();
williamr@4:   _M_have_c = false;
williamr@2:   return __tmp;
williamr@2: }
williamr@2: 
williamr@2: _STLP_END_NAMESPACE
williamr@2: 
williamr@2: #endif /* _STLP_INTERNAL_ISTREAMBUF_ITERATOR_H */
williamr@2: 
williamr@2: // Local Variables:
williamr@2: // mode:C++
williamr@2: // End:
williamr@2: