/usr/share/gccxml-0.9/GCC/3.2/bits/fstream.tcc is in gccxml 0.9.0+cvs20111013-1.
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// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
// 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: 27.8 File-based streams
//
#ifndef _CPP_BITS_FSTREAM_TCC
#define _CPP_BITS_FSTREAM_TCC 1
#pragma GCC system_header
namespace std
{
template<typename _CharT, typename _Traits>
void
basic_filebuf<_CharT, _Traits>::
_M_allocate_internal_buffer()
{
if (!this->_M_buf && this->_M_buf_size_opt)
{
this->_M_buf_size = this->_M_buf_size_opt;
// Allocate internal buffer.
this->_M_buf = new char_type[this->_M_buf_size];
this->_M_buf_allocated = true;
}
}
// Both close and setbuf need to deallocate internal buffers, if it exists.
template<typename _CharT, typename _Traits>
void
basic_filebuf<_CharT, _Traits>::
_M_destroy_internal_buffer()
{
if (this->_M_buf_allocated)
{
delete [] this->_M_buf;
this->_M_buf = NULL;
this->_M_buf_allocated = false;
this->setg(NULL, NULL, NULL);
this->setp(NULL, NULL);
}
}
template<typename _CharT, typename _Traits>
basic_filebuf<_CharT, _Traits>::
basic_filebuf() : __streambuf_type(), _M_file(&_M_lock),
_M_state_cur(__state_type()), _M_state_beg(__state_type()),
_M_buf_allocated(false), _M_last_overflowed(false)
{ this->_M_buf_unified = true; }
template<typename _CharT, typename _Traits>
typename basic_filebuf<_CharT, _Traits>::__filebuf_type*
basic_filebuf<_CharT, _Traits>::
open(const char* __s, ios_base::openmode __mode)
{
__filebuf_type *__ret = NULL;
if (!this->is_open())
{
_M_file.open(__s, __mode);
if (this->is_open())
{
_M_allocate_internal_buffer();
this->_M_mode = __mode;
_M_set_indeterminate();
if ((__mode & ios_base::ate)
&& this->seekoff(0, ios_base::end, __mode) < 0)
{
// 27.8.1.3,4
this->close();
return __ret;
}
__ret = this;
}
}
return __ret;
}
template<typename _CharT, typename _Traits>
typename basic_filebuf<_CharT, _Traits>::__filebuf_type*
basic_filebuf<_CharT, _Traits>::
close()
{
__filebuf_type *__ret = NULL;
if (this->is_open())
{
const int_type __eof = traits_type::eof();
bool __testput = this->_M_out_cur && this->_M_out_beg < this->_M_out_end;
if (__testput
&& traits_type::eq_int_type(_M_really_overflow(__eof), __eof))
return __ret;
// NB: Do this here so that re-opened filebufs will be cool...
this->_M_mode = ios_base::openmode(0);
this->_M_destroy_internal_buffer();
this->_M_pback_destroy();
#if 0
// XXX not done
if (_M_last_overflowed)
{
_M_output_unshift();
_M_really_overflow(__eof);
}
#endif
if (_M_file.close())
__ret = this;
}
_M_last_overflowed = false;
return __ret;
}
template<typename _CharT, typename _Traits>
streamsize
basic_filebuf<_CharT, _Traits>::
showmanyc()
{
streamsize __ret = -1;
bool __testin = this->_M_mode & ios_base::in;
if (__testin && this->is_open())
__ret = this->_M_in_end - this->_M_in_cur;
this->_M_last_overflowed = false;
return __ret;
}
template<typename _CharT, typename _Traits>
typename basic_filebuf<_CharT, _Traits>::int_type
basic_filebuf<_CharT, _Traits>::
pbackfail(int_type __i)
{
int_type __ret = traits_type::eof();
bool __testin = this->_M_mode & ios_base::in;
if (__testin)
{
bool __testpb = this->_M_in_beg < this->_M_in_cur;
char_type __c = traits_type::to_char_type(__i);
bool __testeof = traits_type::eq_int_type(__i, __ret);
if (__testpb)
{
bool __testout = this->_M_mode & ios_base::out;
bool __testeq = traits_type::eq(__c, this->gptr()[-1]);
// Try to put back __c into input sequence in one of three ways.
// Order these tests done in is unspecified by the standard.
if (!__testeof && __testeq)
{
--this->_M_in_cur;
if (__testout)
--this->_M_out_cur;
__ret = __i;
}
else if (__testeof)
{
--this->_M_in_cur;
if (__testout)
--this->_M_out_cur;
__ret = traits_type::not_eof(__i);
}
else if (!__testeof)
{
--this->_M_in_cur;
if (__testout)
--this->_M_out_cur;
this->_M_pback_create();
*this->_M_in_cur = __c;
__ret = __i;
}
}
else
{
// At the beginning of the buffer, need to make a
// putback position available.
this->seekoff(-1, ios_base::cur);
this->underflow();
if (!__testeof)
{
if (!traits_type::eq(__c, *this->_M_in_cur))
{
this->_M_pback_create();
*this->_M_in_cur = __c;
}
__ret = __i;
}
else
__ret = traits_type::not_eof(__i);
}
}
this->_M_last_overflowed = false;
return __ret;
}
template<typename _CharT, typename _Traits>
typename basic_filebuf<_CharT, _Traits>::int_type
basic_filebuf<_CharT, _Traits>::
overflow(int_type __c)
{
int_type __ret = traits_type::eof();
bool __testput = this->_M_out_cur && this->_M_out_cur < this->_M_buf + this->_M_buf_size;
bool __testout = this->_M_mode & ios_base::out;
if (__testout)
{
if (__testput)
{
*this->_M_out_cur = traits_type::to_char_type(__c);
this->_M_out_cur_move(1);
__ret = traits_type::not_eof(__c);
}
else
__ret = this->_M_really_overflow(__c);
}
this->_M_last_overflowed = false; // Set in this->_M_really_overflow, below.
return __ret;
}
template<typename _CharT, typename _Traits>
void
basic_filebuf<_CharT, _Traits>::
_M_convert_to_external(_CharT* __ibuf, streamsize __ilen,
streamsize& __elen, streamsize& __plen)
{
const locale __loc = this->getloc();
const __codecvt_type& __cvt = use_facet<__codecvt_type>(__loc);
if (__cvt.always_noconv() && __ilen)
{
__elen += _M_file.xsputn(reinterpret_cast<char*>(__ibuf), __ilen);
__plen += __ilen;
}
else
{
// Worst-case number of external bytes needed.
int __ext_multiplier = __cvt.encoding();
if (__ext_multiplier == -1 || __ext_multiplier == 0)
__ext_multiplier = sizeof(char_type);
streamsize __blen = __ilen * __ext_multiplier;
char* __buf = static_cast<char*>(__builtin_alloca(__blen));
char* __bend;
const char_type* __iend;
__res_type __r = __cvt.out(_M_state_cur, __ibuf, __ibuf + __ilen,
__iend, __buf, __buf + __blen, __bend);
if (__r == codecvt_base::ok || __r == codecvt_base::partial)
__blen = __bend - __buf;
// Similarly to the always_noconv case above.
else if (__r == codecvt_base::noconv)
{
__buf = reinterpret_cast<char*>(__ibuf);
__blen = __ilen;
}
// Result == error
else
__blen = 0;
if (__blen)
{
__elen += _M_file.xsputn(__buf, __blen);
__plen += __blen;
}
// Try once more for partial conversions.
if (__r == codecvt_base::partial)
{
const char_type* __iresume = __iend;
streamsize __rlen = this->_M_out_end - __iend;
__r = __cvt.out(this->_M_state_cur, __iresume, __iresume + __rlen,
__iend, __buf, __buf + __blen, __bend);
if (__r != codecvt_base::error)
__rlen = __bend - __buf;
else
__rlen = 0;
if (__rlen)
{
__elen += _M_file.xsputn(__buf, __rlen);
__plen += __rlen;
}
}
}
}
template<typename _CharT, typename _Traits>
typename basic_filebuf<_CharT, _Traits>::int_type
basic_filebuf<_CharT, _Traits>::
_M_really_overflow(int_type __c)
{
int_type __ret = traits_type::eof();
bool __testput = this->_M_out_cur && this->_M_out_beg < this->_M_out_end;
bool __testunbuffered = this->_M_file.is_open() && !this->_M_buf_size_opt;
if (__testput || __testunbuffered)
{
// Sizes of external and pending output.
streamsize __elen = 0;
streamsize __plen = 0;
// Need to restore current position. The position of the external
// byte sequence (_M_file) corresponds to _M_filepos, and we need
// to move it to _M_out_beg for the write.
if (this->_M_filepos && this->_M_filepos != this->_M_out_beg)
{
off_type __off = this->_M_out_beg - this->_M_filepos;
this->_M_file.seekoff(__off, ios_base::cur);
}
// Convert internal buffer to external representation, output.
// NB: In the unbuffered case, no internal buffer exists.
if (!__testunbuffered)
_M_convert_to_external(this->_M_out_beg, this->_M_out_end - this->_M_out_beg,
__elen, __plen);
// Convert pending sequence to external representation, output.
// If eof, then just attempt sync.
if (!traits_type::eq_int_type(__c, traits_type::eof()))
{
char_type __pending = traits_type::to_char_type(__c);
_M_convert_to_external(&__pending, 1, __elen, __plen);
// User code must flush when switching modes (thus don't sync).
if (__elen == __plen)
{
_M_set_indeterminate();
__ret = traits_type::not_eof(__c);
}
}
else if (!_M_file.sync())
{
_M_set_indeterminate();
__ret = traits_type::not_eof(__c);
}
}
_M_last_overflowed = true;
return __ret;
}
template<typename _CharT, typename _Traits>
typename basic_filebuf<_CharT, _Traits>::__streambuf_type*
basic_filebuf<_CharT, _Traits>::
setbuf(char_type* __s, streamsize __n)
{
if (!this->is_open() && __s == 0 && __n == 0)
this->_M_buf_size_opt = 0;
else if (__s && __n)
{
// This is implementation-defined behavior, and assumes
// that an external char_type array of length (__s + __n)
// exists and has been pre-allocated. If this is not the
// case, things will quickly blow up.
// Step 1: Destroy the current internal array.
_M_destroy_internal_buffer();
// Step 2: Use the external array.
this->_M_buf = __s;
this->_M_buf_size_opt = this->_M_buf_size = __n;
_M_set_indeterminate();
}
_M_last_overflowed = false;
return this;
}
template<typename _CharT, typename _Traits>
typename basic_filebuf<_CharT, _Traits>::pos_type
basic_filebuf<_CharT, _Traits>::
seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode)
{
pos_type __ret = pos_type(off_type(-1));
bool __testin = (ios_base::in & this->_M_mode & __mode) != 0;
bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;
// Should probably do has_facet checks here.
int __width = use_facet<__codecvt_type>(this->_M_buf_locale).encoding();
if (__width < 0)
__width = 0;
bool __testfail = __off != 0 && __width <= 0;
if (this->is_open() && !__testfail && (__testin || __testout))
{
// Ditch any pback buffers to avoid confusion.
this->_M_pback_destroy();
if (__way != ios_base::cur || __off != 0)
{
off_type __computed_off = __width * __off;
bool __testget = this->_M_in_cur && this->_M_in_beg < this->_M_in_end;
bool __testput = this->_M_out_cur && this->_M_out_beg < this->_M_out_end;
// Sync the internal and external streams.
// out
if (__testput || this->_M_last_overflowed)
{
// Part one: update the output sequence.
this->sync();
// Part two: output unshift sequence.
this->_M_output_unshift();
}
//in
else if (__testget && __way == ios_base::cur)
__computed_off += this->_M_in_cur - this->_M_filepos;
__ret = this->_M_file.seekoff(__computed_off, __way, __mode);
this->_M_set_indeterminate();
}
// NB: Need to do this in case this->_M_file in indeterminate
// state, ie _M_file._offset == -1
else
{
__ret = _M_file.seekoff(__off, ios_base::cur, __mode);
__ret += max(this->_M_out_cur, this->_M_in_cur) - this->_M_filepos;
}
}
this->_M_last_overflowed = false;
return __ret;
}
template<typename _CharT, typename _Traits>
typename basic_filebuf<_CharT, _Traits>::pos_type
basic_filebuf<_CharT, _Traits>::
seekpos(pos_type __pos, ios_base::openmode __mode)
{
#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
// 171. Strange seekpos() semantics due to joint position
return this->seekoff(off_type(__pos), ios_base::beg, __mode);
#endif
}
template<typename _CharT, typename _Traits>
void
basic_filebuf<_CharT, _Traits>::
_M_output_unshift()
{ }
template<typename _CharT, typename _Traits>
void
basic_filebuf<_CharT, _Traits>::
imbue(const locale& __loc)
{
bool __testbeg = this->gptr() == this->eback() && this->pptr() == this->pbase();
if (__testbeg && this->_M_buf_locale != __loc)
this->_M_buf_locale = __loc;
// NB this may require the reconversion of previously
// converted chars. This in turn may cause the reconstruction
// of the original file. YIKES!!
// XXX The part in the above comment is not done.
this->_M_last_overflowed = false;
}
// Inhibit implicit instantiations for required instantiations,
// which are defined via explicit instantiations elsewhere.
// NB: This syntax is a GNU extension.
extern template class basic_filebuf<char>;
extern template class basic_ifstream<char>;
extern template class basic_ofstream<char>;
extern template class basic_fstream<char>;
#ifdef _GLIBCPP_USE_WCHAR_T
extern template class basic_filebuf<wchar_t>;
extern template class basic_ifstream<wchar_t>;
extern template class basic_ofstream<wchar_t>;
extern template class basic_fstream<wchar_t>;
#endif
} // namespace std
#endif
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