// String based streams -*- C++ -*-
// Copyright (C) 1997-1999 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
//
// ISO C++ 14882: 27.7 String-based streams
//
#ifndef _CPP_SSTREAM
#define _CPP_SSTREAM 1
#pragma GCC system_header
#include <bits/std_istream.h>
#include <bits/std_ostream.h>
namespace std
{
template<typename _CharT, typename _Traits, typename _Alloc>
class basic_stringbuf : public basic_streambuf<_CharT, _Traits>
{
public:
// Types:
typedef _CharT char_type;
typedef _Traits traits_type;
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
// 251. basic_stringbuf missing allocator_type
typedef _Alloc allocator_type;
#endif
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
// Non-standard Types:
typedef basic_streambuf<char_type, traits_type> __streambuf_type;
typedef basic_string<char_type, _Traits, _Alloc> __string_type;
typedef typename __string_type::size_type __size_type;
private:
// Data Members:
__string_type _M_string;
public:
// Constructors:
explicit
basic_stringbuf(ios_base::openmode __mode = ios_base::in | ios_base::out)
: __streambuf_type(), _M_string()
{ _M_stringbuf_init(__mode); }
explicit
basic_stringbuf(const __string_type& __str,
ios_base::openmode __mode = ios_base::in | ios_base::out)
: __streambuf_type(), _M_string(__str.c_str())
{ _M_stringbuf_init(__mode); }
// Get and set:
__string_type
str() const
{
if (_M_mode & ios_base::out)
{
// This is the deal: _M_string.size() is value that
// represents the size of the intial string that makes
// _M_string, and may not be the correct size of the
// current stringbuf internal buffer.
__size_type __len = _M_string.size();
if (_M_out_cur > _M_out_beg)
__len = max(__size_type(_M_out_end - _M_out_beg), __len);
return __string_type(_M_out_beg, _M_out_beg + __len);
}
else
return _M_string;
}
void
str(const __string_type& __s)
{
_M_string = __s;
_M_stringbuf_init(_M_mode);
}
protected:
// Common initialization code for both ctors goes here.
void
_M_stringbuf_init(ios_base::openmode __mode)
{
// _M_buf_size is a convenient alias for "what the streambuf
// thinks the allocated size of the string really is." This is
// necessary as ostringstreams are implemented with the
// streambufs having control of the allocation and
// re-allocation of the internal string object, _M_string.
_M_buf_size = _M_string.size();
// NB: Start ostringstream buffers at 1024 bytes. This is an
// experimental value (pronounced "arbitrary" in some of the
// hipper english-speaking countries), and can be changed to
// suite particular needs.
_M_buf_size_opt = 512;
_M_mode = __mode;
if (_M_mode & ios_base::ate)
_M_really_sync(0, _M_buf_size);
else
_M_really_sync(0, 0);
}
// Overridden virtual functions:
virtual int_type
underflow()
{
if (_M_in_cur && _M_in_cur < _M_in_end)
return traits_type::to_int_type(*gptr());
else
return traits_type::eof();
}
virtual int_type
pbackfail(int_type __c = traits_type::eof());
virtual int_type
overflow(int_type __c = traits_type::eof());
virtual __streambuf_type*
setbuf(char_type* __s, streamsize __n)
{
if (__s && __n)
{
_M_string = __string_type(__s, __n);
_M_really_sync(0, 0);
}
return this;
}
virtual pos_type
seekoff(off_type __off, ios_base::seekdir __way,
ios_base::openmode __mode = ios_base::in | ios_base::out);
virtual pos_type
seekpos(pos_type __sp,
ios_base::openmode __mode = ios_base::in | ios_base::out);
// Internal function for correctly updating the internal buffer
// for a particular _M_string, due to initialization or
// re-sizing of an existing _M_string.
// Assumes: contents of _M_string and internal buffer match exactly.
// __i == _M_in_cur - _M_in_beg
// __o == _M_out_cur - _M_out_beg
virtual int
_M_really_sync(__size_type __i, __size_type __o)
{
char_type* __base = const_cast<char_type*>(_M_string.data());
bool __testin = _M_mode & ios_base::in;
bool __testout = _M_mode & ios_base::out;
__size_type __len = _M_string.size();
_M_buf = __base;
if (__testin)
this->setg(__base, __base + __i, __base + __len);
if (__testout)
{
this->setp(__base, __base + __len);
_M_out_cur += __o;
}
return 0;
}
};
// 27.7.2 Template class basic_istringstream
template<typename _CharT, typename _Traits, typename _Alloc>
class basic_istringstream : public basic_istream<_CharT, _Traits>
{
public:
// Types:
typedef _CharT char_type;
typedef _Traits traits_type;
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
// 251. basic_stringbuf missing allocator_type
typedef _Alloc allocator_type;
#endif
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
// Non-standard types:
typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type;
typedef basic_istream<char_type, traits_type> __istream_type;
private:
__stringbuf_type _M_stringbuf;
public:
// Constructors:
explicit
basic_istringstream(ios_base::openmode __mode = ios_base::in)
: __istream_type(NULL), _M_stringbuf(__mode | ios_base::in)
{ this->init(&_M_stringbuf); }
explicit
basic_istringstream(const __string_type& __str,
ios_base::openmode __mode = ios_base::in)
: __istream_type(NULL), _M_stringbuf(__str, __mode | ios_base::in)
{ this->init(&_M_stringbuf); }
~basic_istringstream()
{ }
// Members:
__stringbuf_type*
rdbuf() const
{ return const_cast<__stringbuf_type*>(&_M_stringbuf); }
__string_type
str() const
{ return _M_stringbuf.str(); }
void
str(const __string_type& __s)
{ _M_stringbuf.str(__s); }
};
// 27.7.3 Template class basic_ostringstream
template <typename _CharT, typename _Traits, typename _Alloc>
class basic_ostringstream : public basic_ostream<_CharT, _Traits>
{
public:
// Types:
typedef _CharT char_type;
typedef _Traits traits_type;
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
// 251. basic_stringbuf missing allocator_type
typedef _Alloc allocator_type;
#endif
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
// Non-standard types:
typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type;
typedef basic_ostream<char_type, traits_type> __ostream_type;
private:
__stringbuf_type _M_stringbuf;
public:
// Constructors/destructor:
explicit
basic_ostringstream(ios_base::openmode __mode = ios_base::out)
: __ostream_type(NULL), _M_stringbuf(__mode | ios_base::out)
{ this->init(&_M_stringbuf); }
explicit
basic_ostringstream(const __string_type __str,
ios_base::openmode __mode = ios_base::out)
: __ostream_type(NULL), _M_stringbuf(__str, __mode | ios_base::out)
{ this->init(&_M_stringbuf); }
~basic_ostringstream()
{ }
// Members:
__stringbuf_type*
rdbuf() const
{ return const_cast<__stringbuf_type*>(&_M_stringbuf); }
__string_type
str() const
{ return _M_stringbuf.str(); }
void
str(const __string_type& __s)
{ _M_stringbuf.str(__s); }
};
// 27.7.4 Template class basic_stringstream
template <typename _CharT, typename _Traits, typename _Alloc>
class basic_stringstream : public basic_iostream<_CharT, _Traits>
{
public:
// Types:
typedef _CharT char_type;
typedef _Traits traits_type;
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
// 251. basic_stringbuf missing allocator_type
typedef _Alloc allocator_type;
#endif
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
// Non-standard Types:
typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
typedef basic_stringbuf<_CharT, _Traits, _Alloc> __stringbuf_type;
typedef basic_iostream<char_type, traits_type> __iostream_type;
private:
__stringbuf_type _M_stringbuf;
public:
// Constructors/destructors
explicit
basic_stringstream(ios_base::openmode __m = ios_base::out | ios_base::in)
: __iostream_type(NULL), _M_stringbuf(__m)
{ this->init(&_M_stringbuf); }
explicit
basic_stringstream(const __string_type& __str,
ios_base::openmode __m = ios_base::out | ios_base::in)
: __iostream_type(NULL), _M_stringbuf(__str, __m)
{ this->init(&_M_stringbuf); }
~basic_stringstream()
{ }
// Members:
__stringbuf_type*
rdbuf() const
{ return const_cast<__stringbuf_type*>(&_M_stringbuf); }
__string_type
str() const
{ return _M_stringbuf.str(); }
void
str(const __string_type& __s)
{ _M_stringbuf.str(__s); }
};
} // namespace std
#ifdef _GLIBCPP_NO_TEMPLATE_EXPORT
# define export
#ifdef _GLIBCPP_FULLY_COMPLIANT_HEADERS
# include <bits/sstream.tcc>
#endif
#endif
#endif // _CPP_SSTREAM