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d422980b3f
2001-05-24 Benjamin Kosnik <bkoz@redhat.com> libstdc++/2832 * include/bits/basic_ios.tcc: Small tweak. * include/bits/std_fstream.h (ifstream): Add buffer member. Adjust ctors and dtors, and rdbuf settings. (ofstream): Same. (fstream): Same. * include/bits/std_sstream.h: Same, but for stringstream classes. * testsuite/27_io/ostringstream_members.cc: New. * testsuite/27_io/stringstream_members.cc: New. * testsuite/27_io/fstream_members.cc: New. * testsuite/27_io/ifstream_members.cc: Add test. * testsuite/27_io/istringstream_members.cc: Add test. * testsuite/27_io/ofstream_members.cc: Add test. From-SVN: r42547
353 lines
10 KiB
C++
353 lines
10 KiB
C++
// String based streams -*- C++ -*-
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// Copyright (C) 1997-1999 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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//
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// ISO C++ 14882: 27.7 String-based streams
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//
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#ifndef _CPP_SSTREAM
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#define _CPP_SSTREAM 1
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#pragma GCC system_header
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#include <bits/std_istream.h>
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#include <bits/std_ostream.h>
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namespace std
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{
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template<typename _CharT, typename _Traits, typename _Alloc>
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class basic_stringbuf : public basic_streambuf<_CharT, _Traits>
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{
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public:
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// Types:
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typedef _CharT char_type;
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typedef _Traits traits_type;
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typedef typename traits_type::int_type int_type;
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typedef typename traits_type::pos_type pos_type;
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typedef typename traits_type::off_type off_type;
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// Non-standard Types:
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typedef basic_streambuf<char_type, traits_type> __streambuf_type;
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typedef basic_string<char_type, _Traits, _Alloc> __string_type;
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typedef typename __string_type::size_type __size_type;
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private:
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// Data Members:
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__string_type _M_string;
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public:
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// Constructors:
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explicit
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basic_stringbuf(ios_base::openmode __mode = ios_base::in | ios_base::out)
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: __streambuf_type(), _M_string()
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{ _M_stringbuf_init(__mode); }
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explicit
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basic_stringbuf(const __string_type& __str,
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ios_base::openmode __mode = ios_base::in | ios_base::out)
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: __streambuf_type(), _M_string(__str.c_str())
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{ _M_stringbuf_init(__mode); }
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// Get and set:
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__string_type
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str() const
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{
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if (_M_mode & ios_base::out)
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{
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// This is the deal: _M_string.size() is value that
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// represents the size of the intial string that makes
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// _M_string, and may not be the correct size of the
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// current stringbuf internal buffer.
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__size_type __len = _M_string.size();
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if (_M_out_cur > _M_out_beg)
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__len = max(__size_type(_M_out_end - _M_out_beg), __len);
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return __string_type(_M_out_beg, _M_out_beg + __len);
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}
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else
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return _M_string;
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}
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void
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str(const __string_type& __s)
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{
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_M_string = __s;
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_M_stringbuf_init(_M_mode);
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}
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protected:
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// Common initialization code for both ctors goes here.
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void
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_M_stringbuf_init(ios_base::openmode __mode)
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{
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// _M_buf_size is a convenient alias for "what the streambuf
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// thinks the allocated size of the string really is." This is
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// necessary as ostringstreams are implemented with the
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// streambufs having control of the allocation and
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// re-allocation of the internal string object, _M_string.
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_M_buf_size = _M_string.size();
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// NB: Start ostringstream buffers at 1024 bytes. This is an
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// experimental value (pronounced "arbitrary" in some of the
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// hipper english-speaking countries), and can be changed to
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// suite particular needs.
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_M_buf_size_opt = 512;
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_M_mode = __mode;
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if (_M_mode & ios_base::ate)
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_M_really_sync(0, _M_buf_size);
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else
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_M_really_sync(0, 0);
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}
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// Overridden virtual functions:
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virtual int_type
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underflow()
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{
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if (_M_in_cur && _M_in_cur < _M_in_end)
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return traits_type::to_int_type(*gptr());
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else
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return traits_type::eof();
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}
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virtual int_type
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pbackfail(int_type __c = traits_type::eof());
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virtual int_type
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overflow(int_type __c = traits_type::eof());
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virtual __streambuf_type*
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setbuf(char_type* __s, streamsize __n)
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{
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if (__s && __n)
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{
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_M_string = __string_type(__s, __n);
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_M_really_sync(0, 0);
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}
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return this;
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}
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virtual pos_type
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seekoff(off_type __off, ios_base::seekdir __way,
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ios_base::openmode __mode = ios_base::in | ios_base::out);
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virtual pos_type
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seekpos(pos_type __sp,
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ios_base::openmode __mode = ios_base::in | ios_base::out);
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// Internal function for correctly updating the internal buffer
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// for a particular _M_string, due to initialization or
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// re-sizing of an existing _M_string.
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// Assumes: contents of _M_string and internal buffer match exactly.
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// __i == _M_in_cur - _M_in_beg
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// __o == _M_out_cur - _M_out_beg
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virtual int
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_M_really_sync(__size_type __i, __size_type __o)
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{
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char_type* __base = const_cast<char_type*>(_M_string.data());
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bool __testin = _M_mode & ios_base::in;
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bool __testout = _M_mode & ios_base::out;
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__size_type __len = _M_string.size();
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_M_buf = __base;
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if (__testin)
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this->setg(__base, __base + __i, __base + __len);
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if (__testout)
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{
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this->setp(__base, __base + __len);
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_M_out_cur += __o;
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}
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return 0;
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}
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};
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// 27.7.2 Template class basic_istringstream
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template<typename _CharT, typename _Traits, typename _Alloc>
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class basic_istringstream : public basic_istream<_CharT, _Traits>
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{
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public:
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// Types:
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typedef _CharT char_type;
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typedef _Traits traits_type;
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typedef typename traits_type::int_type int_type;
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typedef typename traits_type::pos_type pos_type;
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typedef typename traits_type::off_type off_type;
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// Non-standard types:
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typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
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typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type;
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typedef basic_istream<char_type, traits_type> __istream_type;
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private:
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__stringbuf_type _M_stringbuf;
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public:
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// Constructors:
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explicit
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basic_istringstream(ios_base::openmode __mode = ios_base::in)
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: __istream_type(NULL), _M_stringbuf(__mode | ios_base::in)
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{ this->init(&_M_stringbuf); }
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explicit
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basic_istringstream(const __string_type& __str,
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ios_base::openmode __mode = ios_base::in)
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: __istream_type(NULL), _M_stringbuf(__str, __mode | ios_base::in)
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{ this->init(&_M_stringbuf); }
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~basic_istringstream()
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{ }
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// Members:
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__stringbuf_type*
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rdbuf() const
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{ return const_cast<__stringbuf_type*>(&_M_stringbuf); }
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__string_type
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str() const
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{ return _M_stringbuf.str(); }
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void
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str(const __string_type& __s)
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{ _M_stringbuf.str(__s); }
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};
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// 27.7.3 Template class basic_ostringstream
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template <typename _CharT, typename _Traits, typename _Alloc>
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class basic_ostringstream : public basic_ostream<_CharT, _Traits>
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{
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public:
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// Types:
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typedef _CharT char_type;
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typedef _Traits traits_type;
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typedef typename traits_type::int_type int_type;
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typedef typename traits_type::pos_type pos_type;
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typedef typename traits_type::off_type off_type;
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// Non-standard types:
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typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
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typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type;
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typedef basic_ostream<char_type, traits_type> __ostream_type;
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private:
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__stringbuf_type _M_stringbuf;
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public:
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// Constructors/destructor:
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explicit
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basic_ostringstream(ios_base::openmode __mode = ios_base::out)
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: __ostream_type(NULL), _M_stringbuf(__mode | ios_base::out)
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{ this->init(&_M_stringbuf); }
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explicit
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basic_ostringstream(const __string_type __str,
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ios_base::openmode __mode = ios_base::out)
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: __ostream_type(NULL), _M_stringbuf(__str, __mode | ios_base::out)
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{ this->init(&_M_stringbuf); }
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~basic_ostringstream()
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{ }
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// Members:
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__stringbuf_type*
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rdbuf() const
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{ return const_cast<__stringbuf_type*>(&_M_stringbuf); }
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__string_type
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str() const
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{ return _M_stringbuf.str(); }
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void
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str(const __string_type& __s)
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{ _M_stringbuf.str(__s); }
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};
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// 27.7.4 Template class basic_stringstream
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template <typename _CharT, typename _Traits, typename _Alloc>
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class basic_stringstream : public basic_iostream<_CharT, _Traits>
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{
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public:
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// Types:
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typedef _CharT char_type;
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typedef _Traits traits_type;
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typedef typename traits_type::int_type int_type;
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typedef typename traits_type::pos_type pos_type;
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typedef typename traits_type::off_type off_type;
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// Non-standard Types:
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typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
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typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type;
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typedef basic_iostream<char_type, traits_type> __iostream_type;
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private:
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__stringbuf_type _M_stringbuf;
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public:
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// Constructors/destructors
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explicit
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basic_stringstream(ios_base::openmode __m = ios_base::out | ios_base::in)
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: __iostream_type(NULL), _M_stringbuf(__m)
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{ this->init(&_M_stringbuf); }
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explicit
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basic_stringstream(const __string_type& __str,
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ios_base::openmode __m = ios_base::out | ios_base::in)
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: __iostream_type(NULL), _M_stringbuf(__str, __m)
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{ this->init(&_M_stringbuf); }
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~basic_stringstream()
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{ }
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// Members:
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__stringbuf_type*
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rdbuf() const
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{ return const_cast<__stringbuf_type*>(&_M_stringbuf); }
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__string_type
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str() const
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{ return _M_stringbuf.str(); }
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void
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str(const __string_type& __s)
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{ _M_stringbuf.str(__s); }
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};
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} // namespace std
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#ifdef _GLIBCPP_NO_TEMPLATE_EXPORT
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# define export
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#ifdef _GLIBCPP_FULLY_COMPLIANT_HEADERS
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# include <bits/sstream.tcc>
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#endif
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#endif
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#endif // _CPP_SSTREAM
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