1 // String based streams -*- C++ -*-
3 // Copyright (C) 1997, 1998, 1999, 2001, 2002
4 // Free Software Foundation, Inc.
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)
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.
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,
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.
32 // ISO C++ 14882: 27.7 String-based streams
35 #ifndef _CPP_BITS_SSTREAM_TCC
36 #define _CPP_BITS_SSTREAM_TCC 1
38 #pragma GCC system_header
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)
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;
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.
57 if (traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1])
66 *_M_in_cur = traits_type::to_char_type(__c);
72 __ret = traits_type::not_eof(__c);
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)
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;
88 // Try to append __c into output sequence in one of two ways.
89 // Order these tests done in is unspecified by the standard.
94 __size_type __len = max(_M_buf_size, _M_buf_size_opt);
98 __ret = this->sputc(__c);
99 else if (__len <= _M_string.max_size())
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);
113 __ret = traits_type::not_eof(__c);
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)
123 pos_type __ret = pos_type(off_type(-1));
124 bool __testin = __mode & ios_base::in && _M_mode & ios_base::in;
125 bool __testout = __mode & ios_base::out && _M_mode & ios_base::out;
126 bool __testboth = __testin && __testout && __way != ios_base::cur;
127 __testin &= !(__mode & ios_base::out);
128 __testout &= !(__mode & ios_base::in);
130 if (_M_buf_size && (__testin || __testout || __testboth))
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;
138 if (__testin || __testboth)
140 __curi = this->gptr();
141 __endi = this->egptr();
143 if (__testout || __testboth)
145 __curo = this->pptr();
146 __endo = this->epptr();
149 off_type __newoffi = 0;
150 off_type __newoffo = 0;
151 if (__way == ios_base::cur)
153 __newoffi = __curi - __beg;
154 __newoffo = __curo - __beg;
156 else if (__way == ios_base::end)
158 __newoffi = __endi - __beg;
159 __newoffo = __endo - __beg;
162 if ((__testin || __testboth)
163 && __newoffi + __off >= 0 && __endi - __beg >= __newoffi + __off)
165 _M_in_cur = __beg + __newoffi + __off;
166 __ret = pos_type(__newoffi);
168 if ((__testout || __testboth)
169 && __newoffo + __off >= 0 && __endo - __beg >= __newoffo + __off)
171 _M_out_cur_move(__newoffo + __off - (_M_out_cur - __beg));
172 __ret = pos_type(__newoffo);
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)
183 pos_type __ret = pos_type(off_type(-1));
187 off_type __pos = __sp._M_position();
188 char_type* __beg = NULL;
189 char_type* __end = NULL;
190 bool __testin = __mode & ios_base::in && _M_mode & ios_base::in;
191 bool __testout = __mode & ios_base::out && _M_mode & ios_base::out;
192 bool __testboth = __testin && __testout;
193 __testin &= !(__mode & ios_base::out);
194 __testout &= !(__mode & ios_base::in);
197 bool __testposi = false;
198 bool __testposo = false;
199 if (__testin || __testboth)
201 __beg = this->eback();
202 __end = this->egptr();
203 if (0 <= __pos && __pos <= __end - __beg)
206 if (__testout || __testboth)
208 __beg = this->pbase();
209 __end = _M_buf + _M_buf_size;
210 if (0 <= __pos && __pos <= __end - __beg)
213 if (__testposi || __testposo)
216 _M_in_cur = _M_in_beg + __pos;
218 _M_out_cur_move((__pos) - (_M_out_cur - __beg));
219 __ret = pos_type(off_type(__pos));
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>;