libstdc++
strstream
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1 // Backward-compat support -*- C++ -*-
2 
3 // Copyright (C) 2001-2020 Free Software Foundation, Inc.
4 //
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
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13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
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16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
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24 
25 /*
26  * Copyright (c) 1998
27  * Silicon Graphics Computer Systems, Inc.
28  *
29  * Permission to use, copy, modify, distribute and sell this software
30  * and its documentation for any purpose is hereby granted without fee,
31  * provided that the above copyright notice appear in all copies and
32  * that both that copyright notice and this permission notice appear
33  * in supporting documentation. Silicon Graphics makes no
34  * representations about the suitability of this software for any
35  * purpose. It is provided "as is" without express or implied warranty.
36  */
37 
38 // WARNING: The classes defined in this header are DEPRECATED. This
39 // header is defined in section D.7.1 of the C++ standard, and it
40 // MAY BE REMOVED in a future standard revision. One should use the
41 // header <sstream> instead.
42 
43 /** @file strstream
44  * This is a Standard C++ Library header.
45  */
46 
47 #ifndef _BACKWARD_STRSTREAM
48 #define _BACKWARD_STRSTREAM
49 
50 #include <backward/backward_warning.h>
51 #include <iosfwd>
52 #include <ios>
53 #include <istream>
54 #include <ostream>
55 
56 namespace std _GLIBCXX_VISIBILITY(default)
57 {
58 _GLIBCXX_BEGIN_NAMESPACE_VERSION
59 
60  // Class strstreambuf, a streambuf class that manages an array of char.
61  // Note that this class is not a template.
62  class strstreambuf : public basic_streambuf<char, char_traits<char> >
63  {
64  public:
65  // Types.
66  typedef char_traits<char> _Traits;
67  typedef basic_streambuf<char, _Traits> _Base;
68 
69  public:
70  // Constructor, destructor
71 #if __cplusplus >= 201103L
72  strstreambuf() : strstreambuf(0) { }
73  explicit strstreambuf(streamsize __initial_capacity);
74 #else
75  explicit strstreambuf(streamsize __initial_capacity = 0);
76 #endif
77  strstreambuf(void* (*__alloc)(size_t), void (*__free)(void*));
78 
79  strstreambuf(char* __get, streamsize __n, char* __put = 0) throw ();
80  strstreambuf(signed char* __get, streamsize __n, signed char* __put = 0) throw ();
81  strstreambuf(unsigned char* __get, streamsize __n, unsigned char* __put=0) throw ();
82 
83  strstreambuf(const char* __get, streamsize __n) throw ();
84  strstreambuf(const signed char* __get, streamsize __n) throw ();
85  strstreambuf(const unsigned char* __get, streamsize __n) throw ();
86 
87  virtual ~strstreambuf();
88 
89 #if __cplusplus >= 201103L
90  strstreambuf(strstreambuf&& __rhs) noexcept
91  : _Base(__rhs), _M_alloc_fun(__rhs._M_alloc_fun),
92  _M_free_fun(__rhs._M_free_fun), _M_dynamic(__rhs._M_dynamic),
93  _M_frozen(__rhs._M_frozen), _M_constant(__rhs._M_constant)
94  {
95  __rhs.setg(nullptr, nullptr, nullptr);
96  __rhs.setp(nullptr, nullptr);
97  }
98 
99  strstreambuf&
100  operator=(strstreambuf&& __rhs) noexcept
101  {
102  if (_M_dynamic && !_M_frozen)
103  _M_free(eback());
104  _Base::operator=(static_cast<const _Base&>(__rhs));
105  _M_alloc_fun = __rhs._M_alloc_fun;
106  _M_free_fun = __rhs._M_free_fun;
107  _M_dynamic = __rhs._M_dynamic;
108  _M_frozen = __rhs._M_frozen;
109  _M_constant = __rhs._M_constant;
110  __rhs.setg(nullptr, nullptr, nullptr);
111  __rhs.setp(nullptr, nullptr);
112  return *this;
113  }
114 #endif
115 
116  public:
117  void freeze(bool = true) throw ();
118  char* str() throw ();
119  _GLIBCXX_PURE int pcount() const throw ();
120 
121  protected:
122  virtual int_type overflow(int_type __c = _Traits::eof());
123  virtual int_type pbackfail(int_type __c = _Traits::eof());
124  virtual int_type underflow();
125  virtual _Base* setbuf(char* __buf, streamsize __n);
126  virtual pos_type seekoff(off_type __off, ios_base::seekdir __dir,
127  ios_base::openmode __mode
128  = ios_base::in | ios_base::out);
129  virtual pos_type seekpos(pos_type __pos, ios_base::openmode __mode
130  = ios_base::in | ios_base::out);
131 
132  private:
133 #if __cplusplus < 201103L
134  strstreambuf&
135  operator=(const strstreambuf&);
136 
137  strstreambuf(const strstreambuf&);
138 #endif
139 
140  // Dynamic allocation, possibly using _M_alloc_fun and _M_free_fun.
141  char* _M_alloc(size_t);
142  void _M_free(char*);
143 
144  // Helper function used in constructors.
145  void _M_setup(char* __get, char* __put, streamsize __n) throw ();
146 
147  // Data members.
148  void* (*_M_alloc_fun)(size_t);
149  void (*_M_free_fun)(void*);
150 
151  bool _M_dynamic : 1;
152  bool _M_frozen : 1;
153  bool _M_constant : 1;
154  };
155 
156  // Class istrstream, an istream that manages a strstreambuf.
157  class istrstream : public basic_istream<char>
158  {
159  public:
160  explicit istrstream(char*);
161  explicit istrstream(const char*);
162  istrstream(char* , streamsize);
163  istrstream(const char*, streamsize);
164  virtual ~istrstream();
165 
166 #if __cplusplus >= 201103L
167  istrstream(istrstream&& __rhs)
168  : istream(std::move(__rhs)), _M_buf(std::move(__rhs._M_buf))
169  { set_rdbuf(&_M_buf); }
170 
171  istrstream& operator=(istrstream&&) = default;
172 #endif
173 
174  _GLIBCXX_CONST strstreambuf* rdbuf() const throw ();
175  char* str() throw ();
176 
177  private:
178  strstreambuf _M_buf;
179  };
180 
181  // Class ostrstream
182  class ostrstream : public basic_ostream<char>
183  {
184  public:
185  ostrstream();
186  ostrstream(char*, int, ios_base::openmode = ios_base::out);
187  virtual ~ostrstream();
188 
189 #if __cplusplus >= 201103L
190  ostrstream(ostrstream&& __rhs)
191  : ostream(std::move(__rhs)), _M_buf(std::move(__rhs._M_buf))
192  { set_rdbuf(&_M_buf); }
193 
194  ostrstream& operator=(ostrstream&&) = default;
195 #endif
196 
197  _GLIBCXX_CONST strstreambuf* rdbuf() const throw ();
198  void freeze(bool = true) throw();
199  char* str() throw ();
200  _GLIBCXX_PURE int pcount() const throw ();
201 
202  private:
203  strstreambuf _M_buf;
204  };
205 
206  // Class strstream
207  class strstream : public basic_iostream<char>
208  {
209  public:
210  typedef char char_type;
211  typedef char_traits<char>::int_type int_type;
212  typedef char_traits<char>::pos_type pos_type;
213  typedef char_traits<char>::off_type off_type;
214 
215  strstream();
216  strstream(char*, int, ios_base::openmode = ios_base::in | ios_base::out);
217  virtual ~strstream();
218 
219 #if __cplusplus >= 201103L
220  strstream(strstream&& __rhs)
221  : iostream(std::move(__rhs)), _M_buf(std::move(__rhs._M_buf))
222  { set_rdbuf(&_M_buf); }
223 
224  strstream& operator=(strstream&&) = default;
225 #endif
226 
227  _GLIBCXX_CONST strstreambuf* rdbuf() const throw ();
228  void freeze(bool = true) throw ();
229  _GLIBCXX_PURE int pcount() const throw ();
230  char* str() throw ();
231 
232  private:
233  strstreambuf _M_buf;
234  };
235 
236 _GLIBCXX_END_NAMESPACE_VERSION
237 } // namespace
238 
239 #endif