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1 /*
2  * Copyright (c) 1999
3  * Silicon Graphics Computer Systems, Inc.
4  *
5  * Copyright (c) 1999
6  * Boris Fomitchev
7  *
8  * This material is provided "as is", with absolutely no warranty expressed
9  * or implied. Any use is at your own risk.
10  *
11  * Permission to use or copy this software for any purpose is hereby granted
12  * without fee, provided the above notices are retained on all copies.
13  * Permission to modify the code and to distribute modified code is granted,
14  * provided the above notices are retained, and a notice that the code was
15  * modified is included with the above copyright notice.
16  *
17  */
18 // WARNING: This is an internal header file, included by other C++
19 // standard library headers.  You should not attempt to use this header
20 // file directly.
21 
22 
23 #ifndef _STLP_INTERNAL_ISTREAMBUF_ITERATOR_H
24 #define _STLP_INTERNAL_ISTREAMBUF_ITERATOR_H
25 
26 #ifndef _STLP_INTERNAL_ITERATOR_BASE_H
27 # include <stl/_iterator_base.h>
28 #endif
29 
30 #ifndef _STLP_INTERNAL_STREAMBUF
31 # include <stl/_streambuf.h>
32 #endif
33 
34 _STLP_BEGIN_NAMESPACE
35 
36 // defined in _istream.h
37 template <class _CharT, class _Traits>
38 extern basic_streambuf<_CharT, _Traits>* _STLP_CALL _M_get_istreambuf(basic_istream<_CharT, _Traits>& ) ;
39 
40 // We do not read any characters until operator* is called. operator* calls sgetc
41 // unless the iterator is unchanged from the last call in which case a cached value is
42 // used. Calls to operator++ use sbumpc.
43 
44 template<class _CharT, class _Traits>
45 class istreambuf_iterator :
46   public iterator<input_iterator_tag, _CharT, typename _Traits::off_type, _CharT*, _CharT&>
47 {
48 public:
49   typedef _CharT                           char_type;
50   typedef _Traits                          traits_type;
51   typedef typename _Traits::int_type       int_type;
52   typedef basic_streambuf<_CharT, _Traits> streambuf_type;
53   typedef basic_istream<_CharT, _Traits>   istream_type;
54 
55   typedef input_iterator_tag               iterator_category;
56   typedef _CharT                           value_type;
57   typedef typename _Traits::off_type       difference_type;
58   typedef const _CharT*                    pointer;
59   typedef const _CharT&                    reference;
60 
61 public:
62   istreambuf_iterator(streambuf_type* __p = 0) { this->_M_init(__p); }
63   //  istreambuf_iterator(basic_istream<_CharT, _Traits>& __is) { this->_M_init(_M_get_istreambuf(__is)); }
64   inline istreambuf_iterator(basic_istream<_CharT, _Traits>& __is);
65 
66   char_type operator*() const { this->_M_getc(); return _M_c; }
67   istreambuf_iterator<_CharT, _Traits>& operator++() {
68     _M_buf->sbumpc();
69     _M_have_c = false;
70     return *this;
71   }
72   istreambuf_iterator<_CharT, _Traits>  operator++(int);
73 
equal(const istreambuf_iterator<_CharT,_Traits> & __i)74   bool equal(const istreambuf_iterator<_CharT, _Traits>& __i) const {
75     if (this->_M_buf)
76       this->_M_getc();
77     if (__i._M_buf)
78       __i._M_getc();
79     return this->_M_eof == __i._M_eof;
80   }
81 
82 private:
_M_init(streambuf_type * __p)83   void _M_init(streambuf_type* __p) {
84     _M_buf = __p;
85     _M_eof = (__p == 0);
86     _M_have_c = false;
87   }
88 
_M_getc()89   void _M_getc() const {
90     if (_M_have_c)
91       return;
92     int_type __c = _M_buf->sgetc();
93     _STLP_MUTABLE(_Self, _M_c) = traits_type::to_char_type(__c);
94     _STLP_MUTABLE(_Self, _M_eof) = traits_type::eq_int_type(__c, traits_type::eof());
95     _STLP_MUTABLE(_Self, _M_have_c) = true;
96   }
97 
98 private:
99   streambuf_type* _M_buf;
100   mutable _CharT _M_c;
101   mutable bool _M_eof;
102   mutable bool _M_have_c;
103 };
104 
105 template<class _CharT, class _Traits>
istreambuf_iterator(basic_istream<_CharT,_Traits> & __is)106 inline istreambuf_iterator<_CharT, _Traits>::istreambuf_iterator(basic_istream<_CharT, _Traits>& __is)
107 { this->_M_init(_M_get_istreambuf(__is)); }
108 
109 template<class _CharT, class _Traits>
110 inline bool _STLP_CALL operator==(const istreambuf_iterator<_CharT, _Traits>& __x,
111                                   const istreambuf_iterator<_CharT, _Traits>& __y) {
112   return __x.equal(__y);
113 }
114 
115 #ifdef _STLP_USE_SEPARATE_RELOPS_NAMESPACE
116 
117 template<class _CharT, class _Traits>
118 inline bool _STLP_CALL operator!=(const istreambuf_iterator<_CharT, _Traits>& __x,
119                                   const istreambuf_iterator<_CharT, _Traits>& __y) {
120   return !__x.equal(__y);
121 }
122 
123 #endif /* _STLP_USE_SEPARATE_RELOPS_NAMESPACE */
124 
125 # if defined (_STLP_USE_TEMPLATE_EXPORT)
126 _STLP_EXPORT_TEMPLATE_CLASS istreambuf_iterator<char, char_traits<char> >;
127 #  if defined (INSTANTIATE_WIDE_STREAMS)
128 _STLP_EXPORT_TEMPLATE_CLASS istreambuf_iterator<wchar_t, char_traits<wchar_t> >;
129 #  endif
130 # endif /* _STLP_USE_TEMPLATE_EXPORT */
131 
132 # ifdef _STLP_USE_OLD_HP_ITERATOR_QUERIES
133 template <class _CharT, class _Traits>
iterator_category(const istreambuf_iterator<_CharT,_Traits> &)134 inline input_iterator_tag _STLP_CALL iterator_category(const istreambuf_iterator<_CharT, _Traits>&) { return input_iterator_tag(); }
135 template <class _CharT, class _Traits>
136 inline streamoff* _STLP_CALL
distance_type(const istreambuf_iterator<_CharT,_Traits> &)137 distance_type(const istreambuf_iterator<_CharT, _Traits>&) { return (streamoff*)0; }
138 template <class _CharT, class _Traits>
value_type(const istreambuf_iterator<_CharT,_Traits> &)139 inline _CharT* _STLP_CALL value_type(const istreambuf_iterator<_CharT, _Traits>&) { return (_CharT*)0; }
140 # endif
141 
142 template <class _CharT, class _Traits>
143 istreambuf_iterator<_CharT, _Traits>
144 istreambuf_iterator<_CharT, _Traits>::operator++(int) {
145   _M_getc(); // __tmp should avoid any future actions under
146   // underlined buffer---during call of operator *()
147   // (due to buffer for *this and __tmp are the same).
148   istreambuf_iterator<_CharT, _Traits> __tmp = *this;
149   _M_buf->sbumpc();
150   _M_have_c = false;
151   return __tmp;
152 }
153 
154 _STLP_END_NAMESPACE
155 
156 #endif /* _STLP_INTERNAL_ISTREAMBUF_ITERATOR_H */
157 
158 // Local Variables:
159 // mode:C++
160 // End:
161 
162