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gcc/libstdc++-v3/bits/fstream.tcc
Benjamin Kosnik b2dad0e372 libstdc++-v3: New directory. 
2000-04-21  Benjamin Kosnik  <bkoz@redhat.com>

	* libstdc++-v3: New directory.

From-SVN: r33317
2000-04-21 20:33:34 +00:00

569 lines
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// File 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: 27.8 File-based streams
//
#ifndef _CPP_BITS_FSTREAM_TCC
#define _CPP_BITS_FSTREAM_TCC 1
namespace std
{
template<typename _CharT, typename _Traits>
void
basic_filebuf<_CharT, _Traits>::
_M_init_filebuf(void)
{
_M_buf_unified = true; // Tie input to output for basic_filebuf.
_M_buf_size = static_cast<int_type>(BUFSIZ * sizeof(char_type));
try {
_M_file = new __file_type(&_M_lock);
}
catch(...) {
delete _M_file;
throw;
}
}
template<typename _CharT, typename _Traits>
basic_filebuf<_CharT, _Traits>::
basic_filebuf()
: __streambuf_type(), _M_file(NULL), _M_last_overflowed(false),
_M_state_cur(), _M_state_beg()
{ _M_fcvt = &use_facet<__codecvt_type>(this->getloc()); }
template<typename _CharT, typename _Traits>
basic_filebuf<_CharT, _Traits>::
basic_filebuf(int __fd, const char* /*__name*/, ios_base::openmode __mode)
: __streambuf_type(), _M_last_overflowed(false),
_M_state_cur(), _M_state_beg()
{
_M_fcvt = &use_facet<__codecvt_type>(this->getloc());
_M_init_filebuf();
_M_file->sys_open(__fd, __mode);
if (this->is_open() && _M_buf_size)
{
_M_mode = __mode;
// XXX So that istream::getc() will only need to get 1 char,
// as opposed to BUF_SIZE.
if (__fd == 0)
_M_buf_size = 1;
try {
_M_buf = new char_type[_M_buf_size];
}
catch(...) {
delete [] _M_buf;
throw;
}
this->_M_set_indeterminate();
}
}
template<typename _CharT, typename _Traits>
basic_filebuf<_CharT, _Traits>::__filebuf_type*
basic_filebuf<_CharT, _Traits>::
open(const char* __s, ios_base::openmode __mode)
{
__filebuf_type *__retval = NULL;
if (!this->is_open())
{
_M_init_filebuf();
_M_file->open(__s, __mode);
if (this->is_open() && _M_buf_size)
{
_M_mode = __mode;
try {
_M_buf = new char_type[_M_buf_size];
}
catch(...) {
delete [] _M_buf;
throw;
}
// For time being, set both (in/out) sets of pointers.
_M_set_indeterminate();
if (__mode & ios_base::ate
&& this->seekoff(0, ios_base::end, __mode) < 0)
this->close();
__retval = this;
}
}
return __retval;
}
template<typename _CharT, typename _Traits>
basic_filebuf<_CharT, _Traits>::__filebuf_type*
basic_filebuf<_CharT, _Traits>::
close()
{
__filebuf_type *__retval = NULL;
if (this->is_open())
{
bool __testput = _M_out_cur && _M_out_beg < _M_out_end;
if (__testput)
_M_really_overflow(traits_type::eof());
#if 0
// XXX not done
if (_M_last_overflowed)
{
_M_output_unshift();
_M_really_overflow(traits_type::eof());
}
#endif
if (_M_file->close())
{
_M_mode = ios_base::openmode(0);
if (_M_buf_size)
delete [] _M_buf;
_M_buf = NULL;
this->setg(NULL, NULL, NULL);
this->setp(NULL, NULL);
__retval = this;
}
}
_M_last_overflowed = false;
return __retval;
}
template<typename _CharT, typename _Traits>
streamsize
basic_filebuf<_CharT, _Traits>::
showmanyc()
{
streamsize __retval = -1;
bool __testin = _M_mode & ios_base::in;
if (__testin)
{
bool __testeof = false;
if (_M_in_cur >= _M_in_end)
__testeof = this->underflow() == traits_type::eof();
if (!__testeof)
__retval = (_M_in_end - _M_in_cur) / sizeof(char_type);
}
_M_last_overflowed = false;
return __retval;
}
template<typename _CharT, typename _Traits>
basic_filebuf<_CharT, _Traits>::int_type
basic_filebuf<_CharT, _Traits>::
underflow()
{
int_type __retval = traits_type::eof();
bool __testget = _M_in_cur && _M_in_beg < _M_in_cur;
bool __testinit = _M_is_indeterminate();
bool __testout = _M_mode & ios_base::out;
bool __testin = _M_mode & ios_base::in;
if (__testin)
{
// Sync internal and external buffers.
// NB: __testget -> __testput as _M_buf_unified here.
if (__testget)
{
if (__testout)
_M_really_overflow();
else
_M_file->seekoff(_M_in_cur - _M_in_beg, ios_base::cur,
ios_base::in);
}
if (__testinit || __testget)
{
// Part one: (Re)fill external buf (_M_file->_IO_*) from
// external byte sequence (whatever physical byte sink or
// FILE actually is.)
char __conv_buf[_M_buf_size];
int_type __size = _M_file->xsgetn(__conv_buf, _M_buf_size);
// Part two: (Re)fill internal buf contents from external buf.
if (0 < __size)
{
_M_set_determinate(__size);
char* __conv_cur = __conv_buf;
_M_state_beg = _M_state_cur;
__res_type __r = _M_fcvt->in(_M_state_cur,
__conv_buf,
__conv_buf + __size,
const_cast<const char*&>(__conv_cur),
_M_in_beg, _M_in_end, _M_in_cur);
if (__r == codecvt_base::partial)
{
// XXX Retry with larger _M_buf size.
}
// Set pointers to internal and external buffers
// correctly. . .
if (__r != codecvt_base::error)
{
if (__testout)
_M_out_cur = _M_in_cur;
__retval = traits_type::to_int_type(*_M_in_cur);
}
// Part three: Sync the current internal buffer
// position with the (now overshot) external buffer
// position.
pos_type __p = _M_file->seekoff(0 - __size, ios_base::cur,
ios_base::in);
if (__p._M_position() == -1)
{
// XXX Something is wrong, do error checking.
}
}
}
}
_M_last_overflowed = false;
return __retval;
}
template<typename _CharT, typename _Traits>
basic_filebuf<_CharT, _Traits>::int_type
basic_filebuf<_CharT, _Traits>::
pbackfail(int_type __i)
{
int_type __retval = traits_type::eof();
char_type __c = traits_type::to_char_type(__i);
bool __testeof = traits_type::eq_int_type(__i, traits_type::eof());
bool __testout = _M_mode & ios_base::out;
bool __testin = _M_mode & ios_base::in;
if (__testin)
{
if (!_M_is_indeterminate())
{
bool __testpb = _M_in_beg < _M_in_cur;
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 && __testpb && __testeq)
{
--_M_in_cur;
if (__testout)
--_M_out_cur;
__retval = __i;
}
else if (!__testeof && __testpb && __testout)
{
--_M_in_cur;
if (__testout)
--_M_out_cur;
*_M_in_cur = __c;
__retval = __i;
}
else if (__testeof && __testpb)
{
--_M_in_cur;
if (__testout)
--_M_out_cur;
__retval = traits_type::not_eof(__i);
}
}
else
{
// Need to make a putback position available.
this->seekoff(-1, ios_base::cur);
this->underflow();
if (!__testeof)
{
*_M_in_cur = __c;
__retval = __c;
}
else
__retval = traits_type::not_eof(__i);
}
}
_M_last_overflowed = false;
return __retval;
}
template<typename _CharT, typename _Traits>
basic_filebuf<_CharT, _Traits>::int_type
basic_filebuf<_CharT, _Traits>::
overflow(int_type __c)
{
int_type __retval = traits_type::eof();
bool __testpos = _M_out_cur && _M_out_cur >= _M_buf + _M_buf_size;
bool __testout = _M_mode & ios_base::out;
if (__testout)
{
if (!__testpos)
{
*_M_out_cur = traits_type::to_char_type(__c);
_M_buf_bump(1);
__retval = traits_type::not_eof(__c);
}
else
__retval = this->_M_really_overflow(__c);
}
_M_last_overflowed = false; // Set in _M_really_overflow, below.
return __retval;
}
template<typename _CharT, typename _Traits>
basic_filebuf<_CharT, _Traits>::int_type
basic_filebuf<_CharT, _Traits>::
_M_really_overflow(int_type __c)
{
int_type __retval = traits_type::eof();
bool __testput = _M_out_cur && _M_out_beg < _M_out_end;
bool __testeof = traits_type::eq_int_type(__c, traits_type::eof());
if (__testput)
{
// Part one: Allocate temporary conversion buffer on
// stack. Convert internal buffer plus __c (ie,
// "pending sequence") to temporary conversion buffer.
int __plen = _M_out_end - _M_out_beg;
char_type __pbuf[__plen + sizeof(char_type)];
traits_type::copy(__pbuf, this->pbase(), __plen);
if (!__testeof)
{
__pbuf[__plen] = traits_type::to_char_type(__c);
++__plen;
}
char_type* __pend;
char __conv_buf[__plen];
char* __conv_end;
_M_state_beg = _M_state_cur;
__res_type __r = _M_fcvt->out(_M_state_cur,
__pbuf, __pbuf + __plen,
const_cast<const char_type*&>(__pend),
__conv_buf, __conv_buf + __plen,
__conv_end);
// Part two: (Re)spill converted "pending sequence"
// contents (now in temporary conversion buffer) to
// external buffer (_M_file->_IO_*) using
// _M_file->sys_write(), and do error (minimal) checking.
if (__r != codecvt_base::error)
{
streamsize __r = _M_file->xsputn(__conv_buf, __plen);
// NB: Need this so that external byte sequence reflects
// internal buffer.
_M_file->sync();
if (__r == __plen)
{
_M_set_indeterminate();
__retval = traits_type::not_eof(__c);
}
}
}
_M_last_overflowed = true;
return __retval;
}
template<typename _CharT, typename _Traits>
basic_filebuf<_CharT, _Traits>::pos_type
basic_filebuf<_CharT, _Traits>::
seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode)
{
pos_type __retval = pos_type(off_type(-1));
bool __testopen = this->is_open();
bool __testin = __mode & ios_base::in && _M_mode & ios_base::in;
bool __testout = __mode & ios_base::out && _M_mode & ios_base::out;
int __width = _M_fcvt->encoding();
if (__width < 0)
__width = 0;
bool __testfail = __off != 0 && __width <= 0;
if (__testopen && !__testfail && (__testin || __testout))
{
if (__way != ios_base::cur || __off != 0)
{
off_type __computed_off = __width * __off;
bool __testget = _M_in_cur && _M_in_beg < _M_in_end;
bool __testput = _M_out_cur && _M_out_beg < _M_out_end;
// Sync the internal and external streams.
// out
if (__testput || _M_last_overflowed)
{
// Part one: update the output sequence.
this->sync();
// Part two: output unshift sequence.
_M_output_unshift();
}
//in
// NB: underflow() rewinds the external buffer.
else if (__testget && __way == ios_base::cur)
__computed_off += _M_in_cur - _M_in_beg;
__retval = _M_file->seekoff(__computed_off, __way, __mode);
if (__retval._M_position() == -1)
__retval == pos_type(off_type(-1));
_M_set_indeterminate();
}
// NB: Need to do this in case _M_file in indeterminate
// state, ie _M_file->_offset == -1
else
{
__retval = _M_file->seekoff(__off, ios_base::cur, __mode);
__retval += max(_M_out_cur, _M_in_cur) - _M_buf;
}
}
_M_last_overflowed = false;
return __retval;
}
template<typename _CharT, typename _Traits>
basic_filebuf<_CharT, _Traits>::pos_type
basic_filebuf<_CharT, _Traits>::
seekpos(pos_type __pos, ios_base::openmode __mode)
{
pos_type __retval;
off_type __off = __pos;
__retval = this->seekoff(__off, ios_base::beg, __mode);
_M_last_overflowed = false;
return __retval;
}
template<typename _CharT, typename _Traits>
void
basic_filebuf<_CharT, _Traits>::
_M_output_unshift()
{
#if 0
// XXX Not complete, or correct.
int __width = _M_fcvt->encoding();
if (__width < 0)
{
// Part one: call codecvt::unshift
int __unsft_len = 0;
char_type __unsft_buf[_M_buf_size];
char_type* __unsft_cur; // XXX Set to external buf.
_M_state_beg = _M_state_cur;
__res_type __r = _M_fcvt->unshift(_M_state_cur,
__unsft_buf,
__unsft_buf + _M_buf_size,
__unsft_cur);
// Note, for char_type == char, wchar_t unshift
// should store no charachers.
if (__r == codecvt_base::ok || __r == codecvt_base::noconv)
__unsft_len = __unsft_cur - __unsft_buf;
// "Output the resulting sequence."
if (__unsft_len)
{
int __plen = _M_out_cur - _M_out_beg;
int __rlen = __plen + __unsft_len;
char_type __rbuf[__rlen];
char_type* __rend;
traits_type::copy(__rbuf, this->pbase(), __plen);
traits_type::copy(__rbuf + __plen, __unsft_buf,
__unsft_len);
char __conv_buf[__rlen];
char* __conv_end;
_M_state_beg = _M_state_cur; // XXX Needed?
__r = _M_fcvt->out(_M_state_cur,
__rbuf, __rbuf + __rlen,
const_cast<const char_type*&>(__rend),
__conv_buf,
__conv_buf + __rlen,
__conv_end);
if (__r != codecvt_base::error)
{
streamsize __r = _M_file->xsputn(__conv_buf,
__rlen);
if (__r == __rlen)
{
_M_out_cur = _M_out_beg;
if (_M_mode & ios_base::in)
_M_in_cur = _M_out_cur;
}
else
{
// XXX Throw "wig out and die exception?"
}
}
}
}
#endif
}
template<typename _CharT, typename _Traits>
void
basic_filebuf<_CharT, _Traits>::
imbue(const locale& __loc)
{
bool __testbeg = gptr() == eback() && pptr() == pbase();
bool __teststate = _M_fcvt->encoding() == -1;
_M_locale_set = true;
if (__testbeg && !__teststate && _M_locale_buf != __loc)
{
// XXX Will need to save these older values.
_M_locale_buf = __loc;
_M_fcvt = &use_facet<__codecvt_type>(_M_locale_buf);
// XXX Necessary?
_M_fctype_buf = &use_facet<__ctype_type>(_M_locale_buf);
}
// 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.
_M_last_overflowed = false;
}
} // namespace std
#endif // _CPP_BITS_FSTREAM_TCC
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