sstream.tcc revision 97403 
1// String based streams -*- C++ -*-
2
3// Copyright (C) 1997, 1998, 1999, 2001, 2002
4// Free Software Foundation, Inc.
5//
6// This file is part of the GNU ISO C++ Library.  This library is free
7// software; you can redistribute it and/or modify it under the
8// terms of the GNU General Public License as published by the
9// Free Software Foundation; either version 2, or (at your option)
10// any later version.
11
12// This library is distributed in the hope that it will be useful,
13// but WITHOUT ANY WARRANTY; without even the implied warranty of
14// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15// GNU General Public License for more details.
16
17// You should have received a copy of the GNU General Public License along
18// with this library; see the file COPYING.  If not, write to the Free
19// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
20// USA.
21
22// As a special exception, you may use this file as part of a free software
23// library without restriction.  Specifically, if other files instantiate
24// templates or use macros or inline functions from this file, or you compile
25// this file and link it with other files to produce an executable, this
26// file does not by itself cause the resulting executable to be covered by
27// the GNU General Public License.  This exception does not however
28// invalidate any other reasons why the executable file might be covered by
29// the GNU General Public License.
30
31//
32// ISO C++ 14882: 27.7  String-based streams
33//
34
35#ifndef _CPP_BITS_SSTREAM_TCC
36#define _CPP_BITS_SSTREAM_TCC	1
37
38#pragma GCC system_header
39
40#include <sstream>
41
42namespace std
43{
44  template <class _CharT, class _Traits, class _Alloc>
45    typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type 
46    basic_stringbuf<_CharT, _Traits, _Alloc>::
47    pbackfail(int_type __c)
48    {
49      int_type __ret = traits_type::eof();
50      bool __testeof = traits_type::eq_int_type(__c, traits_type::eof());
51      bool __testpos = _M_in_cur && _M_in_beg < _M_in_cur; 
52      
53      // Try to put back __c into input sequence in one of three ways.
54      // Order these tests done in is unspecified by the standard.
55      if (__testpos)
56	{
57	  if (traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1])
58	      && !__testeof)
59	    {
60	      --_M_in_cur;
61	      __ret = __c;
62	    }
63	  else if (!__testeof)
64	    {
65	      --_M_in_cur;
66	      *_M_in_cur = traits_type::to_char_type(__c);
67	      __ret = __c;
68	    }
69	  else if (__testeof)
70	    {
71	      --_M_in_cur;
72	      __ret = traits_type::not_eof(__c);
73	    }
74	}
75      return __ret;
76    }
77  
78  template <class _CharT, class _Traits, class _Alloc>
79    typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type 
80    basic_stringbuf<_CharT, _Traits, _Alloc>::
81    overflow(int_type __c)
82    {
83      int_type __ret = traits_type::eof();
84      bool __testeof = traits_type::eq_int_type(__c, __ret);
85      bool __testwrite = _M_out_cur < _M_buf + _M_buf_size;
86      bool __testout = _M_mode & ios_base::out;
87
88      // Try to append __c into output sequence in one of two ways.
89      // Order these tests done in is unspecified by the standard.
90      if (__testout)
91	{
92	  if (!__testeof)
93	    {
94	      __size_type __len = max(_M_buf_size, _M_buf_size_opt);
95	      __len *= 2;
96
97	      if (__testwrite)
98		__ret = this->sputc(__c);
99	      else if (__len <= _M_string.max_size())
100		{
101		  // Force-allocate, re-sync.
102		  _M_string = this->str();
103		  _M_string.reserve(__len);
104		  _M_buf_size = static_cast<int_type>(__len);
105		  _M_really_sync(_M_in_cur - _M_in_beg, 
106				 _M_out_cur - _M_out_beg);
107		  *_M_out_cur = traits_type::to_char_type(__c);
108		  _M_out_cur_move(1);
109		  __ret = __c;
110		}
111	    }
112	  else
113	    __ret = traits_type::not_eof(__c);
114	}
115      return __ret;
116    }
117
118  template <class _CharT, class _Traits, class _Alloc>
119    typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type
120    basic_stringbuf<_CharT, _Traits, _Alloc>::
121    seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode)
122    {
123      pos_type __ret =  pos_type(off_type(-1)); 
124      bool __testin = (ios_base::in & _M_mode & __mode) != 0;
125      bool __testout = (ios_base::out & _M_mode & __mode) != 0;
126      bool __testboth = __testin && __testout && __way != ios_base::cur;
127      __testin &= !(__mode & ios_base::out);
128      __testout &= !(__mode & ios_base::in);
129
130      if (_M_buf_size && (__testin || __testout || __testboth))
131	{
132	  char_type* __beg = _M_buf;
133	  char_type* __curi = NULL;
134	  char_type* __curo = NULL;
135	  char_type* __endi = NULL;
136	  char_type* __endo = NULL;
137
138	  if (__testin || __testboth)
139	    {
140	      __curi = this->gptr();
141	      __endi = this->egptr();
142	    }
143	  if (__testout || __testboth)
144	    {
145	      __curo = this->pptr();
146	      __endo = this->epptr();
147	    }
148
149	  off_type __newoffi = 0;
150	  off_type __newoffo = 0;
151	  if (__way == ios_base::cur)
152	    {
153	      __newoffi = __curi - __beg;
154	      __newoffo = __curo - __beg;
155	    }
156	  else if (__way == ios_base::end)
157	    {
158	      __newoffi = __endi - __beg;
159	      __newoffo = __endo - __beg;
160	    }
161
162	  if ((__testin || __testboth)
163	      && __newoffi + __off >= 0 && __endi - __beg >= __newoffi + __off)
164	    {
165	      _M_in_cur = __beg + __newoffi + __off;
166	      __ret = pos_type(__newoffi);
167	    }
168	  if ((__testout || __testboth)
169	      && __newoffo + __off >= 0 && __endo - __beg >= __newoffo + __off)
170	    {
171	      _M_out_cur_move(__newoffo + __off - (_M_out_cur - __beg));
172	      __ret = pos_type(__newoffo);
173	    }
174	}
175      return __ret;
176    }
177
178  template <class _CharT, class _Traits, class _Alloc>
179    typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type
180    basic_stringbuf<_CharT, _Traits, _Alloc>::
181    seekpos(pos_type __sp, ios_base::openmode __mode)
182    {
183      pos_type __ret =  pos_type(off_type(-1)); 
184      
185      if (_M_buf_size)
186	{
187	  off_type __pos = __sp._M_position();
188	  char_type* __beg = NULL;
189	  char_type* __end = NULL;
190	  bool __testin = (ios_base::in & _M_mode & __mode) != 0;
191	  bool __testout = (ios_base::out & _M_mode & __mode) != 0;
192	  bool __testboth = __testin && __testout;
193	  __testin &= !(__mode & ios_base::out);
194	  __testout &= !(__mode & ios_base::in);
195	  
196	  // NB: Ordered.
197	  bool __testposi = false;
198	  bool __testposo = false;
199	  if (__testin || __testboth)
200	    {
201	      __beg = this->eback();
202	      __end = this->egptr();
203	      if (0 <= __pos && __pos <= __end - __beg)
204		__testposi = true;
205	    }
206	  if (__testout || __testboth)
207	    {
208	      __beg = this->pbase();
209	      __end = _M_buf + _M_buf_size;
210	      if (0 <= __pos && __pos <= __end - __beg)
211		__testposo = true;
212	    }
213	  if (__testposi || __testposo)
214	    {
215	      if (__testposi)
216		_M_in_cur = _M_in_beg + __pos;
217	      if (__testposo)
218		_M_out_cur_move((__pos) - (_M_out_cur - __beg));
219	      __ret = pos_type(off_type(__pos));
220	    }
221	}
222      return __ret;
223    }
224
225  // Inhibit implicit instantiations for required instantiations,
226  // which are defined via explicit instantiations elsewhere.  
227  // NB:  This syntax is a GNU extension.
228  extern template class basic_stringbuf<char>;
229  extern template class basic_stringbuf<wchar_t>;
230  extern template class basic_istringstream<char>;
231  extern template class basic_istringstream<wchar_t>;
232  extern template class basic_ostringstream<char>;
233  extern template class basic_ostringstream<wchar_t>;
234  extern template class basic_stringstream<char>;
235  extern template class basic_stringstream<wchar_t>;
236} // namespace std
237
238#endif
239