1 // String based streams -*- C++ -*-
3 // Copyright (C) 1997-1999 Free Software Foundation, Inc.
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
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 2, or (at your option)
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // You should have received a copy of the GNU General Public License along
17 // with this library; see the file COPYING. If not, write to the Free
18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
21 // As a special exception, you may use this file as part of a free software
22 // library without restriction. Specifically, if other files instantiate
23 // templates or use macros or inline functions from this file, or you compile
24 // this file and link it with other files to produce an executable, this
25 // file does not by itself cause the resulting executable to be covered by
26 // the GNU General Public License. This exception does not however
27 // invalidate any other reasons why the executable file might be covered by
28 // the GNU General Public License.
31 // ISO C++ 14882: 27.7 String-based streams
34 #ifndef _CPP_BITS_SSTREAM_TCC
35 #define _CPP_BITS_SSTREAM_TCC 1
37 #include <bits/std_sstream.h>
41 template <class _CharT, class _Traits, class _Alloc>
42 basic_stringbuf<_CharT, _Traits, _Alloc>::int_type
43 basic_stringbuf<_CharT, _Traits, _Alloc>::
44 pbackfail(int_type __c)
46 int_type __ret = traits_type::eof();
47 bool __testeof = traits_type::eq_int_type(__c, traits_type::eof());
48 bool __testpos = _M_in_cur && _M_in_beg < _M_in_cur;
50 // Try to put back __c into input sequence in one of three ways.
51 // Order these tests done in is unspecified by the standard.
54 if (traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1])
63 *_M_in_cur = traits_type::to_char_type(__c);
69 __ret = traits_type::not_eof(__c);
75 template <class _CharT, class _Traits, class _Alloc>
76 basic_stringbuf<_CharT, _Traits, _Alloc>::int_type
77 basic_stringbuf<_CharT, _Traits, _Alloc>::
78 overflow(int_type __c)
80 int_type __ret = traits_type::eof();
81 bool __testeof = traits_type::eq_int_type(__c, __ret);
82 bool __testwrite = _M_out_cur < _M_buf + _M_buf_size;
83 bool __testout = _M_mode & ios_base::out;
85 // Try to append __c into output sequence in one of two ways.
86 // Order these tests done in is unspecified by the standard.
91 __size_type __len = max(_M_buf_size, _M_buf_size_opt);
95 __ret = this->sputc(__c);
96 else if (__len <= _M_string.max_size())
98 // Force-allocate, re-sync.
99 _M_string = this->str();
100 _M_string.reserve(__len);
101 _M_buf_size = static_cast<int_type>(__len);
102 _M_really_sync(_M_in_cur - _M_in_beg,
103 _M_out_cur - _M_out_beg);
104 *_M_out_cur = traits_type::to_char_type(__c);
110 __ret = traits_type::not_eof(__c);
115 template <class _CharT, class _Traits, class _Alloc>
116 basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type
117 basic_stringbuf<_CharT, _Traits, _Alloc>::
118 seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode)
120 pos_type __ret = pos_type(off_type(-1));
121 bool __testin = __mode & ios_base::in && _M_mode & ios_base::in;
122 bool __testout = __mode & ios_base::out && _M_mode & ios_base::out;
123 bool __testboth = __testin && __testout && __way != ios_base::cur;
125 if (_M_buf_size && ((__testin != __testout) || __testboth))
127 char_type* __beg = _M_buf;
128 char_type* __curi = NULL;
129 char_type* __curo = NULL;
130 char_type* __endi = NULL;
131 char_type* __endo = NULL;
135 __curi = this->gptr();
136 __endi = this->egptr();
140 __curo = this->pptr();
141 __endo = this->epptr();
144 off_type __newoffi = 0;
145 off_type __newoffo = 0;
146 if (__way == ios_base::cur)
148 __newoffi = __curi - __beg;
149 __newoffo = __curo - __beg;
151 else if (__way == ios_base::end)
153 __newoffi = __endi - __beg;
154 __newoffo = __endo - __beg;
158 && __newoffi + __off >= 0 && __endi - __beg >= __newoffi + __off)
160 _M_in_cur = __beg + __newoffi + __off;
161 __ret = pos_type(__newoffi);
164 && __newoffo + __off >= 0 && __endo - __beg >= __newoffo + __off)
166 _M_out_cur_move(__newoffo + __off - (_M_out_cur - __beg));
167 __ret = pos_type(__newoffo);
173 template <class _CharT, class _Traits, class _Alloc>
174 basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type
175 basic_stringbuf<_CharT, _Traits, _Alloc>::
176 seekpos(pos_type __sp, ios_base::openmode __mode)
178 pos_type __ret = pos_type(off_type(-1));
179 off_type __pos = __sp._M_position();
180 char_type* __beg = NULL;
181 char_type* __end = NULL;
182 bool __testin = __mode & ios_base::in && _M_mode & ios_base::in;
183 bool __testout = __mode & ios_base::out && _M_mode & ios_base::out;
187 __beg = this->eback();
188 __end = this->egptr();
192 __beg = this->pbase();
193 __end = _M_buf + _M_buf_size;
196 if (0 <= __pos && __pos <= __end - __beg)
198 // Need to set both of these if applicable
200 _M_in_cur = _M_in_beg + __pos;
202 _M_out_cur_move((__pos) - (_M_out_cur - __beg));
203 __ret = pos_type(off_type(__pos));
211 #endif /* _CPP_BITS_SSTREAM_TCC */