// File based streams -*- C++ -*-
-// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
+// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
+// 2007, 2008, 2009, 2010, 2011
// 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)
+// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// 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.
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
-// 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.
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/fstream.tcc
+ * This is an internal header file, included by other library headers.
+ * Do not attempt to use it directly. @headername{fstream}
+ */
//
// ISO C++ 14882: 27.8 File-based streams
//
-#ifndef _CPP_BITS_FSTREAM_TCC
-#define _CPP_BITS_FSTREAM_TCC 1
+#ifndef _FSTREAM_TCC
+#define _FSTREAM_TCC 1
#pragma GCC system_header
-namespace std
-{
+#include <bits/cxxabi_forced.h>
+
+_GLIBCXX_BEGIN_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)
+ // Allocate internal buffer only if one doesn't already exist
+ // (either allocated or provided by the user via setbuf).
+ if (!_M_buf_allocated && !_M_buf)
{
- this->_M_buf_size = this->_M_buf_size_opt;
-
- // Allocate internal buffer...
- this->_M_buf = new char_type[this->_M_buf_size];
- // ... and consistently set the end of buffer pointer.
- this->_M_out_end = this->_M_buf + this->_M_buf_size;
+ _M_buf = new char_type[_M_buf_size];
_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()
+ _M_destroy_internal_buffer() throw()
{
if (_M_buf_allocated)
{
- delete [] this->_M_buf;
- this->_M_buf = NULL;
+ delete [] _M_buf;
+ _M_buf = 0;
_M_buf_allocated = false;
- this->setg(NULL, NULL, NULL);
- this->setp(NULL, NULL);
}
+ delete [] _M_ext_buf;
+ _M_ext_buf = 0;
+ _M_ext_buf_size = 0;
+ _M_ext_next = 0;
+ _M_ext_end = 0;
}
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; }
+ basic_filebuf() : __streambuf_type(), _M_lock(), _M_file(&_M_lock),
+ _M_mode(ios_base::openmode(0)), _M_state_beg(), _M_state_cur(),
+ _M_state_last(), _M_buf(0), _M_buf_size(BUFSIZ),
+ _M_buf_allocated(false), _M_reading(false), _M_writing(false), _M_pback(),
+ _M_pback_cur_save(0), _M_pback_end_save(0), _M_pback_init(false),
+ _M_codecvt(0), _M_ext_buf(0), _M_ext_buf_size(0), _M_ext_next(0),
+ _M_ext_end(0)
+ {
+ if (has_facet<__codecvt_type>(this->_M_buf_locale))
+ _M_codecvt = &use_facet<__codecvt_type>(this->_M_buf_locale);
+ }
template<typename _CharT, typename _Traits>
- typename basic_filebuf<_CharT, _Traits>::__filebuf_type*
+ typename basic_filebuf<_CharT, _Traits>::__filebuf_type*
basic_filebuf<_CharT, _Traits>::
open(const char* __s, ios_base::openmode __mode)
{
- __filebuf_type *__ret = NULL;
+ __filebuf_type *__ret = 0;
if (!this->is_open())
{
_M_file.open(__s, __mode);
if (this->is_open())
{
_M_allocate_internal_buffer();
- this->_M_mode = __mode;
+ _M_mode = __mode;
- // Setup initial position of buffer.
- _M_set_indeterminate();
+ // Setup initial buffer to 'uncommitted' mode.
+ _M_reading = false;
+ _M_writing = false;
+ _M_set_buffer(-1);
- // Set input buffer to something real.
- // NB: Must open in non-blocking way to do this, or must
- // set the initial position in a different manner than
- // using underflow.
- if (__mode & ios_base::in && _M_buf_allocated)
- this->underflow();
-
- if ((__mode & ios_base::ate)
- && this->seekoff(0, ios_base::end, __mode) < 0)
- {
- // 27.8.1.3,4
- this->close();
- return __ret;
- }
+ // Reset to initial state.
+ _M_state_last = _M_state_cur = _M_state_beg;
- __ret = this;
+ // 27.8.1.3,4
+ if ((__mode & ios_base::ate)
+ && this->seekoff(0, ios_base::end, __mode)
+ == pos_type(off_type(-1)))
+ this->close();
+ else
+ __ret = this;
}
}
return __ret;
}
template<typename _CharT, typename _Traits>
- typename basic_filebuf<_CharT, _Traits>::__filebuf_type*
+ 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_lim;
- 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);
- _M_destroy_internal_buffer();
- _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;
- }
+ if (!this->is_open())
+ return 0;
- _M_last_overflowed = false;
- return __ret;
+ bool __testfail = false;
+ {
+ // NB: Do this here so that re-opened filebufs will be cool...
+ struct __close_sentry
+ {
+ basic_filebuf *__fb;
+ __close_sentry (basic_filebuf *__fbi): __fb(__fbi) { }
+ ~__close_sentry ()
+ {
+ __fb->_M_mode = ios_base::openmode(0);
+ __fb->_M_pback_init = false;
+ __fb->_M_destroy_internal_buffer();
+ __fb->_M_reading = false;
+ __fb->_M_writing = false;
+ __fb->_M_set_buffer(-1);
+ __fb->_M_state_last = __fb->_M_state_cur = __fb->_M_state_beg;
+ }
+ } __cs (this);
+
+ __try
+ {
+ if (!_M_terminate_output())
+ __testfail = true;
+ }
+ __catch(__cxxabiv1::__forced_unwind&)
+ {
+ _M_file.close();
+ __throw_exception_again;
+ }
+ __catch(...)
+ { __testfail = true; }
+ }
+
+ if (!_M_file.close())
+ __testfail = true;
+
+ if (__testfail)
+ return 0;
+ else
+ return this;
}
template<typename _CharT, typename _Traits>
- streamsize
+ streamsize
basic_filebuf<_CharT, _Traits>::
showmanyc()
{
streamsize __ret = -1;
- bool __testin = this->_M_mode & ios_base::in;
-
+ const bool __testin = _M_mode & ios_base::in;
if (__testin && this->is_open())
- __ret = this->_M_in_end - this->_M_in_cur;
- _M_last_overflowed = false;
+ {
+ // For a stateful encoding (-1) the pending sequence might be just
+ // shift and unshift prefixes with no actual character.
+ __ret = this->egptr() - this->gptr();
+
+#if _GLIBCXX_HAVE_DOS_BASED_FILESYSTEM
+ // About this workaround, see libstdc++/20806.
+ const bool __testbinary = _M_mode & ios_base::binary;
+ if (__check_facet(_M_codecvt).encoding() >= 0
+ && __testbinary)
+#else
+ if (__check_facet(_M_codecvt).encoding() >= 0)
+#endif
+ __ret += _M_file.showmanyc() / _M_codecvt->max_length();
+ }
return __ret;
}
-
+
template<typename _CharT, typename _Traits>
- typename basic_filebuf<_CharT, _Traits>::int_type
+ typename basic_filebuf<_CharT, _Traits>::int_type
basic_filebuf<_CharT, _Traits>::
- pbackfail(int_type __i)
+ underflow()
{
int_type __ret = traits_type::eof();
- bool __testin = this->_M_mode & ios_base::in;
-
+ const bool __testin = _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)
+ if (_M_writing)
{
- 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)
+ if (overflow() == traits_type::eof())
+ return __ret;
+ _M_set_buffer(-1);
+ _M_writing = false;
+ }
+ // Check for pback madness, and if so switch back to the
+ // normal buffers and jet outta here before expensive
+ // fileops happen...
+ _M_destroy_pback();
+
+ if (this->gptr() < this->egptr())
+ return traits_type::to_int_type(*this->gptr());
+
+ // Get and convert input sequence.
+ const size_t __buflen = _M_buf_size > 1 ? _M_buf_size - 1 : 1;
+
+ // Will be set to true if ::read() returns 0 indicating EOF.
+ bool __got_eof = false;
+ // Number of internal characters produced.
+ streamsize __ilen = 0;
+ codecvt_base::result __r = codecvt_base::ok;
+ if (__check_facet(_M_codecvt).always_noconv())
+ {
+ __ilen = _M_file.xsgetn(reinterpret_cast<char*>(this->eback()),
+ __buflen);
+ if (__ilen == 0)
+ __got_eof = true;
+ }
+ else
+ {
+ // Worst-case number of external bytes.
+ // XXX Not done encoding() == -1.
+ const int __enc = _M_codecvt->encoding();
+ streamsize __blen; // Minimum buffer size.
+ streamsize __rlen; // Number of chars to read.
+ if (__enc > 0)
+ __blen = __rlen = __buflen * __enc;
+ else
{
- --this->_M_in_cur;
- if (__testout)
- --this->_M_out_cur;
- __ret = traits_type::not_eof(__i);
+ __blen = __buflen + _M_codecvt->max_length() - 1;
+ __rlen = __buflen;
}
- else if (!__testeof)
+ const streamsize __remainder = _M_ext_end - _M_ext_next;
+ __rlen = __rlen > __remainder ? __rlen - __remainder : 0;
+
+ // An imbue in 'read' mode implies first converting the external
+ // chars already present.
+ if (_M_reading && this->egptr() == this->eback() && __remainder)
+ __rlen = 0;
+
+ // Allocate buffer if necessary and move unconverted
+ // bytes to front.
+ if (_M_ext_buf_size < __blen)
{
- --this->_M_in_cur;
- if (__testout)
- --this->_M_out_cur;
- _M_pback_create();
- *this->_M_in_cur = __c;
- __ret = __i;
+ char* __buf = new char[__blen];
+ if (__remainder)
+ __builtin_memcpy(__buf, _M_ext_next, __remainder);
+
+ delete [] _M_ext_buf;
+ _M_ext_buf = __buf;
+ _M_ext_buf_size = __blen;
}
- }
- else
- {
- // At the beginning of the buffer, need to make a
- // putback position available.
- // But the seek may fail (f.i., at the beginning of
- // a file, see libstdc++/9439) and in that case
- // we return traits_type::eof()
- if (this->seekoff(-1, ios_base::cur) >= 0)
+ else if (__remainder)
+ __builtin_memmove(_M_ext_buf, _M_ext_next, __remainder);
+
+ _M_ext_next = _M_ext_buf;
+ _M_ext_end = _M_ext_buf + __remainder;
+ _M_state_last = _M_state_cur;
+
+ do
{
- this->underflow();
- if (!__testeof)
+ if (__rlen > 0)
{
- if (!traits_type::eq(__c, *this->_M_in_cur))
+ // Sanity check!
+ // This may fail if the return value of
+ // codecvt::max_length() is bogus.
+ if (_M_ext_end - _M_ext_buf + __rlen > _M_ext_buf_size)
{
- _M_pback_create();
- *this->_M_in_cur = __c;
+ __throw_ios_failure(__N("basic_filebuf::underflow "
+ "codecvt::max_length() "
+ "is not valid"));
}
- __ret = __i;
+ streamsize __elen = _M_file.xsgetn(_M_ext_end, __rlen);
+ if (__elen == 0)
+ __got_eof = true;
+ else if (__elen == -1)
+ break;
+ _M_ext_end += __elen;
+ }
+
+ char_type* __iend = this->eback();
+ if (_M_ext_next < _M_ext_end)
+ __r = _M_codecvt->in(_M_state_cur, _M_ext_next,
+ _M_ext_end, _M_ext_next,
+ this->eback(),
+ this->eback() + __buflen, __iend);
+ if (__r == codecvt_base::noconv)
+ {
+ size_t __avail = _M_ext_end - _M_ext_buf;
+ __ilen = std::min(__avail, __buflen);
+ traits_type::copy(this->eback(),
+ reinterpret_cast<char_type*>
+ (_M_ext_buf), __ilen);
+ _M_ext_next = _M_ext_buf + __ilen;
}
else
- __ret = traits_type::not_eof(__i);
+ __ilen = __iend - this->eback();
+
+ // _M_codecvt->in may return error while __ilen > 0: this is
+ // ok, and actually occurs in case of mixed encodings (e.g.,
+ // XML files).
+ if (__r == codecvt_base::error)
+ break;
+
+ __rlen = 1;
}
- }
+ while (__ilen == 0 && !__got_eof);
+ }
+
+ if (__ilen > 0)
+ {
+ _M_set_buffer(__ilen);
+ _M_reading = true;
+ __ret = traits_type::to_int_type(*this->gptr());
+ }
+ else if (__got_eof)
+ {
+ // If the actual end of file is reached, set 'uncommitted'
+ // mode, thus allowing an immediate write without an
+ // intervening seek.
+ _M_set_buffer(-1);
+ _M_reading = false;
+ // However, reaching it while looping on partial means that
+ // the file has got an incomplete character.
+ if (__r == codecvt_base::partial)
+ __throw_ios_failure(__N("basic_filebuf::underflow "
+ "incomplete character in file"));
+ }
+ else if (__r == codecvt_base::error)
+ __throw_ios_failure(__N("basic_filebuf::underflow "
+ "invalid byte sequence in file"));
+ else
+ __throw_ios_failure(__N("basic_filebuf::underflow "
+ "error reading the file"));
}
- _M_last_overflowed = false;
return __ret;
}
template<typename _CharT, typename _Traits>
- typename basic_filebuf<_CharT, _Traits>::int_type
+ typename basic_filebuf<_CharT, _Traits>::int_type
+ basic_filebuf<_CharT, _Traits>::
+ pbackfail(int_type __i)
+ {
+ int_type __ret = traits_type::eof();
+ const bool __testin = _M_mode & ios_base::in;
+ if (__testin)
+ {
+ if (_M_writing)
+ {
+ if (overflow() == traits_type::eof())
+ return __ret;
+ _M_set_buffer(-1);
+ _M_writing = false;
+ }
+ // Remember whether the pback buffer is active, otherwise below
+ // we may try to store in it a second char (libstdc++/9761).
+ const bool __testpb = _M_pback_init;
+ const bool __testeof = traits_type::eq_int_type(__i, __ret);
+ int_type __tmp;
+ if (this->eback() < this->gptr())
+ {
+ this->gbump(-1);
+ __tmp = traits_type::to_int_type(*this->gptr());
+ }
+ else if (this->seekoff(-1, ios_base::cur) != pos_type(off_type(-1)))
+ {
+ __tmp = this->underflow();
+ if (traits_type::eq_int_type(__tmp, __ret))
+ return __ret;
+ }
+ else
+ {
+ // At the beginning of the buffer, need to make a
+ // putback position available. But the seek may fail
+ // (f.i., at the beginning of a file, see
+ // libstdc++/9439) and in that case we return
+ // traits_type::eof().
+ return __ret;
+ }
+
+ // Try to put back __i into input sequence in one of three ways.
+ // Order these tests done in is unspecified by the standard.
+ if (!__testeof && traits_type::eq_int_type(__i, __tmp))
+ __ret = __i;
+ else if (__testeof)
+ __ret = traits_type::not_eof(__i);
+ else if (!__testpb)
+ {
+ _M_create_pback();
+ _M_reading = true;
+ *this->gptr() = traits_type::to_char_type(__i);
+ __ret = __i;
+ }
+ }
+ 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 = _M_out_buf_size();
- bool __testout = this->_M_mode & ios_base::out;
-
+ const bool __testeof = traits_type::eq_int_type(__c, __ret);
+ const bool __testout = _M_mode & ios_base::out;
if (__testout)
{
- if (traits_type::eq_int_type(__c, traits_type::eof()))
- __ret = traits_type::not_eof(__c);
- else if (__testput)
+ if (_M_reading)
+ {
+ _M_destroy_pback();
+ const int __gptr_off = _M_get_ext_pos(_M_state_last);
+ if (_M_seek(__gptr_off, ios_base::cur, _M_state_last)
+ == pos_type(off_type(-1)))
+ return __ret;
+ }
+ if (this->pbase() < this->pptr())
{
- *this->_M_out_cur = traits_type::to_char_type(__c);
- _M_out_cur_move(1);
+ // If appropriate, append the overflow char.
+ if (!__testeof)
+ {
+ *this->pptr() = traits_type::to_char_type(__c);
+ this->pbump(1);
+ }
+
+ // Convert pending sequence to external representation,
+ // and output.
+ if (_M_convert_to_external(this->pbase(),
+ this->pptr() - this->pbase()))
+ {
+ _M_set_buffer(0);
+ __ret = traits_type::not_eof(__c);
+ }
+ }
+ else if (_M_buf_size > 1)
+ {
+ // Overflow in 'uncommitted' mode: set _M_writing, set
+ // the buffer to the initial 'write' mode, and put __c
+ // into the buffer.
+ _M_set_buffer(0);
+ _M_writing = true;
+ if (!__testeof)
+ {
+ *this->pptr() = traits_type::to_char_type(__c);
+ this->pbump(1);
+ }
__ret = traits_type::not_eof(__c);
}
- else
- __ret = this->_M_really_overflow(__c);
+ else
+ {
+ // Unbuffered.
+ char_type __conv = traits_type::to_char_type(__c);
+ if (__testeof || _M_convert_to_external(&__conv, 1))
+ {
+ _M_writing = true;
+ __ret = traits_type::not_eof(__c);
+ }
+ }
}
-
- _M_last_overflowed = false; // Set in _M_really_overflow, below.
return __ret;
}
-
+
template<typename _CharT, typename _Traits>
- void
+ bool
basic_filebuf<_CharT, _Traits>::
- _M_convert_to_external(_CharT* __ibuf, streamsize __ilen,
- streamsize& __elen, streamsize& __plen)
+ _M_convert_to_external(_CharT* __ibuf, streamsize __ilen)
{
- const locale __loc = this->getloc();
- const __codecvt_type& __cvt = use_facet<__codecvt_type>(__loc);
-
- if (__cvt.always_noconv() && __ilen)
+ // Sizes of external and pending output.
+ streamsize __elen;
+ streamsize __plen;
+ if (__check_facet(_M_codecvt).always_noconv())
{
- __elen += _M_file.xsputn(reinterpret_cast<char*>(__ibuf), __ilen);
- __plen += __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;
+ // XXX Not done encoding() == -1.
+ streamsize __blen = __ilen * _M_codecvt->max_length();
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);
+ codecvt_base::result __r;
+ __r = _M_codecvt->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)
{
+ // Same as the always_noconv case above.
__buf = reinterpret_cast<char*>(__ibuf);
__blen = __ilen;
}
- // Result == error
- else
- __blen = 0;
-
- if (__blen)
- {
- __elen += _M_file.xsputn(__buf, __blen);
- __plen += __blen;
- }
+ else
+ __throw_ios_failure(__N("basic_filebuf::_M_convert_to_external "
+ "conversion error"));
+
+ __elen = _M_file.xsputn(__buf, __blen);
+ __plen = __blen;
// Try once more for partial conversions.
- if (__r == codecvt_base::partial)
+ if (__r == codecvt_base::partial && __elen == __plen)
{
const char_type* __iresume = __iend;
- streamsize __rlen = this->_M_out_lim - __iend;
- __r = __cvt.out(_M_state_cur, __iresume, __iresume + __rlen,
- __iend, __buf, __buf + __blen, __bend);
+ streamsize __rlen = this->pptr() - __iend;
+ __r = _M_codecvt->out(_M_state_cur, __iresume,
+ __iresume + __rlen, __iend, __buf,
+ __buf + __blen, __bend);
if (__r != codecvt_base::error)
- __rlen = __bend - __buf;
- else
{
- __rlen = 0;
- // Signal to the caller (_M_really_overflow) that
- // codecvt::out eventually failed.
- __elen = 0;
- }
- if (__rlen)
- {
- __elen += _M_file.xsputn(__buf, __rlen);
- __plen += __rlen;
+ __rlen = __bend - __buf;
+ __elen = _M_file.xsputn(__buf, __rlen);
+ __plen = __rlen;
}
+ else
+ __throw_ios_failure(__N("basic_filebuf::_M_convert_to_external "
+ "conversion error"));
}
}
+ return __elen == __plen;
}
template<typename _CharT, typename _Traits>
- typename basic_filebuf<_CharT, _Traits>::int_type
+ streamsize
basic_filebuf<_CharT, _Traits>::
- _M_really_overflow(int_type __c)
+ xsgetn(_CharT* __s, streamsize __n)
{
- int_type __ret = traits_type::eof();
- bool __testput = this->_M_out_cur && this->_M_out_beg < this->_M_out_lim;
- bool __testunbuffered = _M_file.is_open() && !this->_M_buf_size_opt;
-
- if (__testput || __testunbuffered)
+ // Clear out pback buffer before going on to the real deal...
+ streamsize __ret = 0;
+ if (_M_pback_init)
{
- // 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 (_M_filepos && _M_filepos != this->_M_out_beg)
+ if (__n > 0 && this->gptr() == this->eback())
{
- off_type __off = this->_M_out_beg - _M_filepos;
- _M_file.seekoff(__off, ios_base::cur);
+ *__s++ = *this->gptr(); // emulate non-underflowing sbumpc
+ this->gbump(1);
+ __ret = 1;
+ --__n;
}
+ _M_destroy_pback();
+ }
+ else if (_M_writing)
+ {
+ if (overflow() == traits_type::eof())
+ return __ret;
+ _M_set_buffer(-1);
+ _M_writing = false;
+ }
+
+ // Optimization in the always_noconv() case, to be generalized in the
+ // future: when __n > __buflen we read directly instead of using the
+ // buffer repeatedly.
+ const bool __testin = _M_mode & ios_base::in;
+ const streamsize __buflen = _M_buf_size > 1 ? _M_buf_size - 1 : 1;
+
+ if (__n > __buflen && __check_facet(_M_codecvt).always_noconv()
+ && __testin)
+ {
+ // First, copy the chars already present in the buffer.
+ const streamsize __avail = this->egptr() - this->gptr();
+ if (__avail != 0)
+ {
+ if (__avail == 1)
+ *__s = *this->gptr();
+ else
+ traits_type::copy(__s, this->gptr(), __avail);
+ __s += __avail;
+ this->gbump(__avail);
+ __ret += __avail;
+ __n -= __avail;
+ }
+
+ // Need to loop in case of short reads (relatively common
+ // with pipes).
+ streamsize __len;
+ for (;;)
+ {
+ __len = _M_file.xsgetn(reinterpret_cast<char*>(__s),
+ __n);
+ if (__len == -1)
+ __throw_ios_failure(__N("basic_filebuf::xsgetn "
+ "error reading the file"));
+ if (__len == 0)
+ break;
+
+ __n -= __len;
+ __ret += __len;
+ if (__n == 0)
+ break;
+
+ __s += __len;
+ }
+
+ if (__n == 0)
+ {
+ _M_set_buffer(0);
+ _M_reading = true;
+ }
+ else if (__len == 0)
+ {
+ // If end of file is reached, set 'uncommitted'
+ // mode, thus allowing an immediate write without
+ // an intervening seek.
+ _M_set_buffer(-1);
+ _M_reading = false;
+ }
+ }
+ else
+ __ret += __streambuf_type::xsgetn(__s, __n);
+
+ return __ret;
+ }
- // 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_lim - this->_M_out_beg,
- __elen, __plen);
+ template<typename _CharT, typename _Traits>
+ streamsize
+ basic_filebuf<_CharT, _Traits>::
+ xsputn(const _CharT* __s, streamsize __n)
+ {
+ streamsize __ret = 0;
+ // Optimization in the always_noconv() case, to be generalized in the
+ // future: when __n is sufficiently large we write directly instead of
+ // using the buffer.
+ const bool __testout = _M_mode & ios_base::out;
+ if (__check_facet(_M_codecvt).always_noconv()
+ && __testout && !_M_reading)
+ {
+ // Measurement would reveal the best choice.
+ const streamsize __chunk = 1ul << 10;
+ streamsize __bufavail = this->epptr() - this->pptr();
- // Checks for codecvt.out failures and _M_file.xsputn failures,
- // respectively, inside _M_convert_to_external.
- if (__testunbuffered || (__elen && __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);
+ // Don't mistake 'uncommitted' mode buffered with unbuffered.
+ if (!_M_writing && _M_buf_size > 1)
+ __bufavail = _M_buf_size - 1;
- // User code must flush when switching modes (thus don't sync).
- if (__elen == __plen && __elen)
- {
- _M_set_indeterminate();
- __ret = traits_type::not_eof(__c);
- }
- }
- else if (!_M_file.sync())
+ const streamsize __limit = std::min(__chunk, __bufavail);
+ if (__n >= __limit)
+ {
+ const streamsize __buffill = this->pptr() - this->pbase();
+ const char* __buf = reinterpret_cast<const char*>(this->pbase());
+ __ret = _M_file.xsputn_2(__buf, __buffill,
+ reinterpret_cast<const char*>(__s),
+ __n);
+ if (__ret == __buffill + __n)
{
- _M_set_indeterminate();
- __ret = traits_type::not_eof(__c);
+ _M_set_buffer(0);
+ _M_writing = true;
}
+ if (__ret > __buffill)
+ __ret -= __buffill;
+ else
+ __ret = 0;
}
+ else
+ __ret = __streambuf_type::xsputn(__s, __n);
}
- _M_last_overflowed = true;
- return __ret;
+ else
+ __ret = __streambuf_type::xsputn(__s, __n);
+ return __ret;
}
template<typename _CharT, typename _Traits>
- typename basic_filebuf<_CharT, _Traits>::__streambuf_type*
+ 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)
+ if (!this->is_open())
{
- // 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;
- // Consistently set the end of buffer pointer.
- this->_M_out_end = this->_M_buf + this->_M_buf_size;
- _M_set_indeterminate();
+ if (__s == 0 && __n == 0)
+ _M_buf_size = 1;
+ else if (__s && __n > 0)
+ {
+ // This is implementation-defined behavior, and assumes that
+ // an external char_type array of length __n exists and has
+ // been pre-allocated. If this is not the case, things will
+ // quickly blow up. When __n > 1, __n - 1 positions will be
+ // used for the get area, __n - 1 for the put area and 1
+ // position to host the overflow char of a full put area.
+ // When __n == 1, 1 position will be used for the get area
+ // and 0 for the put area, as in the unbuffered case above.
+ _M_buf = __s;
+ _M_buf_size = __n;
+ }
}
- _M_last_overflowed = false;
- return this;
+ return this;
}
-
+
+
+ // According to 27.8.1.4 p11 - 13, seekoff should ignore the last
+ // argument (of type openmode).
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)
+ seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode)
{
- 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();
+ int __width = 0;
+ if (_M_codecvt)
+ __width = _M_codecvt->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.
- _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_lim;
- // 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
- else if (__testget && __way == ios_base::cur)
- __computed_off += this->_M_in_cur - _M_filepos;
+ pos_type __ret = pos_type(off_type(-1));
+ const bool __testfail = __off != 0 && __width <= 0;
+ if (this->is_open() && !__testfail)
+ {
+ // tellg and tellp queries do not affect any state, unless
+ // ! always_noconv and the put sequence is not empty.
+ // In that case, determining the position requires converting the
+ // put sequence. That doesn't use ext_buf, so requires a flush.
+ bool __no_movement = __way == ios_base::cur && __off == 0
+ && (!_M_writing || _M_codecvt->always_noconv());
- // Return pos_type(off_type(-1)) in case of failure.
- __ret = _M_file.seekoff(__computed_off, __way, __mode);
- _M_set_indeterminate();
+ // Ditch any pback buffers to avoid confusion.
+ if (!__no_movement)
+ _M_destroy_pback();
+
+ // Correct state at destination. Note that this is the correct
+ // state for the current position during output, because
+ // codecvt::unshift() returns the state to the initial state.
+ // This is also the correct state at the end of the file because
+ // an unshift sequence should have been written at the end.
+ __state_type __state = _M_state_beg;
+ off_type __computed_off = __off * __width;
+ if (_M_reading && __way == ios_base::cur)
+ {
+ __state = _M_state_last;
+ __computed_off += _M_get_ext_pos(__state);
}
- // NB: Need to do this in case _M_file in indeterminate
- // state, ie _M_file._offset == -1
+ if (!__no_movement)
+ __ret = _M_seek(__computed_off, __way, __state);
else
{
- pos_type __tmp =
- _M_file.seekoff(__off, ios_base::cur, __mode);
- if (__tmp >= 0)
+ if (_M_writing)
+ __computed_off = this->pptr() - this->pbase();
+
+ off_type __file_off = _M_file.seekoff(0, ios_base::cur);
+ if (__file_off != off_type(-1))
{
- // Seek successful.
- __ret = __tmp;
- __ret +=
- std::max(this->_M_out_cur, this->_M_in_cur) - _M_filepos;
+ __ret = __file_off + __computed_off;
+ __ret.state(__state);
}
}
}
- _M_last_overflowed = false;
return __ret;
}
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 171. Strange seekpos() semantics due to joint position
+ // According to the resolution of DR 171, seekpos should ignore the last
+ // argument (of type openmode).
template<typename _CharT, typename _Traits>
typename basic_filebuf<_CharT, _Traits>::pos_type
basic_filebuf<_CharT, _Traits>::
- seekpos(pos_type __pos, ios_base::openmode __mode)
+ seekpos(pos_type __pos, ios_base::openmode)
{
-#ifdef _GLIBCPP_RESOLVE_LIB_DEFECTS
-// 171. Strange seekpos() semantics due to joint position
- return this->seekoff(off_type(__pos), ios_base::beg, __mode);
-#endif
+ pos_type __ret = pos_type(off_type(-1));
+ if (this->is_open())
+ {
+ // Ditch any pback buffers to avoid confusion.
+ _M_destroy_pback();
+ __ret = _M_seek(off_type(__pos), ios_base::beg, __pos.state());
+ }
+ return __ret;
}
template<typename _CharT, typename _Traits>
- void
+ typename basic_filebuf<_CharT, _Traits>::pos_type
basic_filebuf<_CharT, _Traits>::
- _M_output_unshift()
- { }
+ _M_seek(off_type __off, ios_base::seekdir __way, __state_type __state)
+ {
+ pos_type __ret = pos_type(off_type(-1));
+ if (_M_terminate_output())
+ {
+ off_type __file_off = _M_file.seekoff(__off, __way);
+ if (__file_off != off_type(-1))
+ {
+ _M_reading = false;
+ _M_writing = false;
+ _M_ext_next = _M_ext_end = _M_ext_buf;
+ _M_set_buffer(-1);
+ _M_state_cur = __state;
+ __ret = __file_off;
+ __ret.state(_M_state_cur);
+ }
+ }
+ return __ret;
+ }
+
+ // Returns the distance from the end of the ext buffer to the point
+ // corresponding to gptr(). This is a negative value. Updates __state
+ // from eback() correspondence to gptr().
+ template<typename _CharT, typename _Traits>
+ int basic_filebuf<_CharT, _Traits>::
+ _M_get_ext_pos(__state_type& __state)
+ {
+ if (_M_codecvt->always_noconv())
+ return this->gptr() - this->egptr();
+ else
+ {
+ // Calculate offset from _M_ext_buf that corresponds to
+ // gptr(). Precondition: __state == _M_state_last, which
+ // corresponds to eback().
+ const int __gptr_off =
+ _M_codecvt->length(__state, _M_ext_buf, _M_ext_next,
+ this->gptr() - this->eback());
+ return _M_ext_buf + __gptr_off - _M_ext_end;
+ }
+ }
+
+ template<typename _CharT, typename _Traits>
+ bool
+ basic_filebuf<_CharT, _Traits>::
+ _M_terminate_output()
+ {
+ // Part one: update the output sequence.
+ bool __testvalid = true;
+ if (this->pbase() < this->pptr())
+ {
+ const int_type __tmp = this->overflow();
+ if (traits_type::eq_int_type(__tmp, traits_type::eof()))
+ __testvalid = false;
+ }
+
+ // Part two: output unshift sequence.
+ if (_M_writing && !__check_facet(_M_codecvt).always_noconv()
+ && __testvalid)
+ {
+ // Note: this value is arbitrary, since there is no way to
+ // get the length of the unshift sequence from codecvt,
+ // without calling unshift.
+ const size_t __blen = 128;
+ char __buf[__blen];
+ codecvt_base::result __r;
+ streamsize __ilen = 0;
+
+ do
+ {
+ char* __next;
+ __r = _M_codecvt->unshift(_M_state_cur, __buf,
+ __buf + __blen, __next);
+ if (__r == codecvt_base::error)
+ __testvalid = false;
+ else if (__r == codecvt_base::ok ||
+ __r == codecvt_base::partial)
+ {
+ __ilen = __next - __buf;
+ if (__ilen > 0)
+ {
+ const streamsize __elen = _M_file.xsputn(__buf, __ilen);
+ if (__elen != __ilen)
+ __testvalid = false;
+ }
+ }
+ }
+ while (__r == codecvt_base::partial && __ilen > 0 && __testvalid);
+
+ if (__testvalid)
+ {
+ // This second call to overflow() is required by the standard,
+ // but it's not clear why it's needed, since the output buffer
+ // should be empty by this point (it should have been emptied
+ // in the first call to overflow()).
+ const int_type __tmp = this->overflow();
+ if (traits_type::eq_int_type(__tmp, traits_type::eof()))
+ __testvalid = false;
+ }
+ }
+ return __testvalid;
+ }
+
+ template<typename _CharT, typename _Traits>
+ int
+ basic_filebuf<_CharT, _Traits>::
+ sync()
+ {
+ // Make sure that the internal buffer resyncs its idea of
+ // the file position with the external file.
+ int __ret = 0;
+ if (this->pbase() < this->pptr())
+ {
+ const int_type __tmp = this->overflow();
+ if (traits_type::eq_int_type(__tmp, traits_type::eof()))
+ __ret = -1;
+ }
+ return __ret;
+ }
template<typename _CharT, typename _Traits>
void
basic_filebuf<_CharT, _Traits>::
imbue(const locale& __loc)
{
- bool __testbeg = gptr() == eback() && pptr() == pbase();
+ bool __testvalid = true;
+
+ const __codecvt_type* _M_codecvt_tmp = 0;
+ if (__builtin_expect(has_facet<__codecvt_type>(__loc), true))
+ _M_codecvt_tmp = &use_facet<__codecvt_type>(__loc);
- if (__testbeg && this->_M_buf_locale != __loc)
- this->_M_buf_locale = __loc;
+ if (this->is_open())
+ {
+ // encoding() == -1 is ok only at the beginning.
+ if ((_M_reading || _M_writing)
+ && __check_facet(_M_codecvt).encoding() == -1)
+ __testvalid = false;
+ else
+ {
+ if (_M_reading)
+ {
+ if (__check_facet(_M_codecvt).always_noconv())
+ {
+ if (_M_codecvt_tmp
+ && !__check_facet(_M_codecvt_tmp).always_noconv())
+ __testvalid = this->seekoff(0, ios_base::cur, _M_mode)
+ != pos_type(off_type(-1));
+ }
+ else
+ {
+ // External position corresponding to gptr().
+ _M_ext_next = _M_ext_buf
+ + _M_codecvt->length(_M_state_last, _M_ext_buf,
+ _M_ext_next,
+ this->gptr() - this->eback());
+ const streamsize __remainder = _M_ext_end - _M_ext_next;
+ if (__remainder)
+ __builtin_memmove(_M_ext_buf, _M_ext_next, __remainder);
+
+ _M_ext_next = _M_ext_buf;
+ _M_ext_end = _M_ext_buf + __remainder;
+ _M_set_buffer(-1);
+ _M_state_last = _M_state_cur = _M_state_beg;
+ }
+ }
+ else if (_M_writing && (__testvalid = _M_terminate_output()))
+ _M_set_buffer(-1);
+ }
+ }
- // 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;
+ if (__testvalid)
+ _M_codecvt = _M_codecvt_tmp;
+ else
+ _M_codecvt = 0;
}
// Inhibit implicit instantiations for required instantiations,
- // which are defined via explicit instantiations elsewhere.
+ // which are defined via explicit instantiations elsewhere.
// NB: This syntax is a GNU extension.
-#if _GLIBCPP_EXTERN_TEMPLATE
+#if _GLIBCXX_EXTERN_TEMPLATE
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
+#ifdef _GLIBCXX_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
#endif
-} // namespace std
-#endif
+_GLIBCXX_END_NAMESPACE
+
+#endif
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