// 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
// Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// 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,
+// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.
// As a special exception, you may use this file as part of a free software
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
+/** @file fstream.tcc
+ * This is an internal header file, included by other library headers.
+ * You should not attempt to use it directly.
+ */
+
//
// 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
-{
+_GLIBCXX_BEGIN_NAMESPACE(std)
+
template<typename _CharT, typename _Traits>
void
basic_filebuf<_CharT, _Traits>::
_M_allocate_internal_buffer()
{
- if (!_M_buf_allocated && this->_M_buf_size)
+ // 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)
{
- // Allocate internal buffer.
- this->_M_buf = new char_type[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>::
{
if (_M_buf_allocated)
{
- delete [] this->_M_buf;
- this->_M_buf = NULL;
+ delete [] _M_buf;
+ _M_buf = NULL;
_M_buf_allocated = false;
- this->setg(NULL, NULL, NULL);
- this->setp(NULL, NULL);
}
+ delete [] _M_ext_buf;
+ _M_ext_buf = NULL;
+ _M_ext_buf_size = 0;
+ _M_ext_next = NULL;
+ _M_ext_end = 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(NULL), _M_buf_size(BUFSIZ), _M_buf_allocated(false),
- _M_last_overflowed(false), _M_filepos(0), _M_pback_cur_save(0),
- _M_pback_end_save(0), _M_pback_init(false), _M_codecvt(0)
- {
- 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(NULL), _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)
{
if (this->is_open())
{
_M_allocate_internal_buffer();
- this->_M_mode = __mode;
+ _M_mode = __mode;
- // Setup initial position of buffer.
- _M_set_buffer(0);
+ // Setup initial buffer to 'uncommitted' mode.
+ _M_reading = false;
+ _M_writing = false;
+ _M_set_buffer(-1);
+
+ // Reset to initial state.
+ _M_state_last = _M_state_cur = _M_state_beg;
- if ((__mode & ios_base::ate)
- && this->seekoff(0, ios_base::end, __mode) < 0)
- // 27.8.1.3,4
+ // 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;
}
template<typename _CharT, typename _Traits>
- typename basic_filebuf<_CharT, _Traits>::__filebuf_type*
+ typename basic_filebuf<_CharT, _Traits>::__filebuf_type*
basic_filebuf<_CharT, _Traits>::
close() throw()
{
bool __testfail = false;
try
{
- const int_type __eof = traits_type::eof();
- const bool __testput = this->_M_out_beg < this->_M_out_lim;
-
- if (__testput
- && traits_type::eq_int_type(this->overflow(), __eof))
+ if (!_M_terminate_output())
__testfail = true;
-
-#if 0
- // XXX not done
- if (_M_last_overflowed)
- {
- _M_output_unshift();
- this->overflow();
- }
-#endif
}
catch(...)
- {
- __testfail = true;
- }
-
+ { __testfail = true; }
+
// NB: Do this here so that re-opened filebufs will be cool...
- this->_M_mode = ios_base::openmode(0);
- this->_M_pback_init = false;
+ _M_mode = ios_base::openmode(0);
+ _M_pback_init = false;
_M_destroy_internal_buffer();
-
+ _M_reading = false;
+ _M_writing = false;
+ _M_set_buffer(-1);
+ _M_state_last = _M_state_cur = _M_state_beg;
+
if (!_M_file.close())
__testfail = true;
if (!__testfail)
__ret = this;
}
- _M_last_overflowed = false;
return __ret;
}
template<typename _CharT, typename _Traits>
- streamsize
+ streamsize
basic_filebuf<_CharT, _Traits>::
showmanyc()
{
streamsize __ret = -1;
- const bool __testin = this->_M_mode & ios_base::in;
-
+ const bool __testin = _M_mode & ios_base::in;
if (__testin && this->is_open())
{
// For a stateful encoding (-1) the pending sequence might be just
// shift and unshift prefixes with no actual character.
- __ret = this->_M_in_end - this->_M_in_cur;
+ __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();
}
-
- _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>::
- _M_underflow(bool __bump)
+ underflow()
{
int_type __ret = traits_type::eof();
- const bool __testin = this->_M_mode & ios_base::in;
- const bool __testout = this->_M_mode & ios_base::out;
-
- if (__testin)
+ const bool __testin = _M_mode & ios_base::in;
+ if (__testin && !_M_writing)
{
// Check for pback madness, and if so swich back to the
// normal buffers and jet outta here before expensive
// fileops happen...
_M_destroy_pback();
- const size_t __buflen = this->_M_buf_size > 1
- ? this->_M_buf_size - 1 : 1;
-
- if (this->_M_in_cur < this->_M_in_end)
- {
- __ret = traits_type::to_int_type(*this->_M_in_cur);
- if (__bump)
- _M_move_in_cur(1);
- return __ret;
- }
+ if (this->gptr() < this->egptr())
+ return traits_type::to_int_type(*this->gptr());
- // Sync internal and external buffers.
- if (__testout && this->_M_out_beg < this->_M_out_lim)
- this->overflow();
-
// Get and convert input sequence.
- streamsize __elen = 0;
+ 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())
{
- __elen = _M_file.xsgetn(reinterpret_cast<char*>(this->_M_in_beg), __buflen);
- __ilen = __elen;
+ __ilen = _M_file.xsgetn(reinterpret_cast<char*>(this->eback()),
+ __buflen);
+ if (__ilen == 0)
+ __got_eof = true;
}
else
{
- char* __buf = static_cast<char*>(__builtin_alloca(__buflen));
- __elen = _M_file.xsgetn(__buf, __buflen);
-
- const char* __eend;
- char_type* __iend;
- codecvt_base::result __r;
- __r = _M_codecvt->in(_M_state_cur, __buf, __buf + __elen,
- __eend, this->_M_in_beg,
- this->_M_in_beg + __buflen, __iend);
- if (__r == codecvt_base::ok)
- __ilen = __iend - this->_M_in_beg;
- else if (__r == codecvt_base::noconv)
+ // 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
+ {
+ __blen = __buflen + _M_codecvt->max_length() - 1;
+ __rlen = __buflen;
+ }
+ 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)
{
- traits_type::copy(this->_M_in_beg,
- reinterpret_cast<char_type*>(__buf),
- __elen);
- __ilen = __elen;
+ char* __buf = new char[__blen];
+ if (__remainder)
+ std::memcpy(__buf, _M_ext_next, __remainder);
+
+ delete [] _M_ext_buf;
+ _M_ext_buf = __buf;
+ _M_ext_buf_size = __blen;
}
- else
+ else if (__remainder)
+ std::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
{
- // Unwind.
- __ilen = 0;
- _M_file.seekoff(-__elen, ios_base::cur, ios_base::in);
+ if (__rlen > 0)
+ {
+ // 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)
+ {
+ __throw_ios_failure(__N("basic_filebuf::underflow "
+ "codecvt::max_length() "
+ "is not valid"));
+ }
+ 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;
+ __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
+ __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);
- __ret = traits_type::to_int_type(*this->_M_in_cur);
- if (__bump)
- _M_move_in_cur(1);
- }
+ _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 = this->_M_mode & ios_base::in;
-
- if (__testin)
+ const bool __testin = _M_mode & ios_base::in;
+ if (__testin && !_M_writing)
{
// Remember whether the pback buffer is active, otherwise below
// we may try to store in it a second char (libstdc++/9761).
- const bool __testpb = this->_M_pback_init;
+ const bool __testpb = _M_pback_init;
const bool __testeof = traits_type::eq_int_type(__i, __ret);
-
int_type __tmp;
- if (this->_M_in_beg < this->_M_in_cur)
+ if (this->eback() < this->gptr())
{
- _M_move_in_cur(-1);
- __tmp = traits_type::to_int_type(*this->_M_in_cur);
+ this->gbump(-1);
+ __tmp = traits_type::to_int_type(*this->gptr());
}
- else if (this->seekoff(-1, ios_base::cur) >= 0)
+ else if (this->seekoff(-1, ios_base::cur) != pos_type(off_type(-1)))
{
__tmp = this->underflow();
if (traits_type::eq_int_type(__tmp, __ret))
else if (!__testpb)
{
_M_create_pback();
- *this->_M_in_cur = traits_type::to_char_type(__i);
+ _M_reading = true;
+ *this->gptr() = traits_type::to_char_type(__i);
__ret = __i;
}
}
- _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>::
overflow(int_type __c)
{
int_type __ret = traits_type::eof();
const bool __testeof = traits_type::eq_int_type(__c, __ret);
- const bool __testout = this->_M_mode & ios_base::out;
-
- if (__testout)
+ const bool __testout = _M_mode & ios_base::out;
+ if (__testout && !_M_reading)
{
- if (this->_M_out_beg < this->_M_out_lim)
+ if (this->pbase() < this->pptr())
{
- // 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 != this->_M_out_beg)
- _M_file.seekoff(this->_M_out_beg - _M_filepos, ios_base::cur);
-
// If appropriate, append the overflow char.
if (!__testeof)
- *this->_M_out_lim++ = traits_type::to_char_type(__c);
-
+ {
+ *this->pptr() = traits_type::to_char_type(__c);
+ this->pbump(1);
+ }
+
// Convert pending sequence to external representation,
- // output.
- if (_M_convert_to_external(this->_M_out_beg,
- this->_M_out_lim - this->_M_out_beg)
- && (!__testeof || (__testeof && !_M_file.sync())))
+ // 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
{
// Unbuffered.
char_type __conv = traits_type::to_char_type(__c);
- if (!__testeof && _M_convert_to_external(&__conv, 1))
- __ret = __c;
+ if (__testeof || _M_convert_to_external(&__conv, 1))
+ {
+ _M_writing = true;
+ __ret = traits_type::not_eof(__c);
+ }
}
}
- _M_last_overflowed = true;
return __ret;
}
-
+
template<typename _CharT, typename _Traits>
bool
basic_filebuf<_CharT, _Traits>::
_M_convert_to_external(_CharT* __ibuf, streamsize __ilen)
{
// Sizes of external and pending output.
- streamsize __elen = 0;
- streamsize __plen = 0;
-
+ 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 = _M_codecvt->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;
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;
else if (__r == codecvt_base::noconv)
__blen = __ilen;
}
else
- {
- // Result == error .
- __blen = 0;
- }
-
- if (__blen)
- {
- __elen += _M_file.xsputn(__buf, __blen);
- __plen += __blen;
- }
-
+ __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;
+ streamsize __rlen = this->pptr() - __iend;
__r = _M_codecvt->out(_M_state_cur, __iresume,
- __iresume + __rlen, __iend, __buf,
+ __iresume + __rlen, __iend, __buf,
__buf + __blen, __bend);
if (__r != codecvt_base::error)
{
__rlen = __bend - __buf;
- __elen += _M_file.xsputn(__buf, __rlen);
- __plen += __rlen;
+ __elen = _M_file.xsputn(__buf, __rlen);
+ __plen = __rlen;
}
+ else
+ __throw_ios_failure(__N("basic_filebuf::_M_convert_to_external "
+ "conversion error"));
}
}
- return __elen && __elen == __plen;
+ return __elen == __plen;
+ }
+
+ template<typename _CharT, typename _Traits>
+ streamsize
+ basic_filebuf<_CharT, _Traits>::
+ xsgetn(_CharT* __s, streamsize __n)
+ {
+ // Clear out pback buffer before going on to the real deal...
+ streamsize __ret = 0;
+ if (_M_pback_init)
+ {
+ if (__n > 0 && this->gptr() == this->eback())
+ {
+ *__s++ = *this->gptr();
+ this->gbump(1);
+ __ret = 1;
+ --__n;
+ }
+ _M_destroy_pback();
+ }
+
+ // 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 && !_M_writing)
+ {
+ // 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;
+ }
+
+ template<typename _CharT, typename _Traits>
+ streamsize
+ basic_filebuf<_CharT, _Traits>::
+ xsputn(const _CharT* __s, streamsize __n)
+ {
+ // 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.
+ streamsize __ret = 0;
+ 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();
+
+ // Don't mistake 'uncommitted' mode buffered with unbuffered.
+ if (!_M_writing && _M_buf_size > 1)
+ __bufavail = _M_buf_size - 1;
+
+ 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_buffer(0);
+ _M_writing = true;
+ }
+ if (__ret > __buffill)
+ __ret -= __buffill;
+ else
+ __ret = 0;
+ }
+ else
+ __ret = __streambuf_type::xsputn(__s, __n);
+ }
+ 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 = 1;
- else if (__s && __n > 1)
- {
- // 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. The length argument __n must
- // be greater than 1 because __n - 1 positions will be used
- // for the get and put areas, and 1 position is needed to
- // host the overflow char of a full put area.
-
- // 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 = __n;
- _M_set_buffer(0);
- }
- _M_last_overflowed = false;
- return this;
+ if (!this->is_open())
+ 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;
+ }
+ 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));
- const bool __testin = (ios_base::in & this->_M_mode & __mode) != 0;
- const bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;
-
int __width = 0;
if (_M_codecvt)
- __width = _M_codecvt->encoding();
+ __width = _M_codecvt->encoding();
if (__width < 0)
__width = 0;
- const bool __testfail = __off != 0 && __width <= 0;
- if (this->is_open() && !__testfail && (__testin || __testout))
+ pos_type __ret = pos_type(off_type(-1));
+ const bool __testfail = __off != 0 && __width <= 0;
+ if (this->is_open() && !__testfail)
{
// Ditch any pback buffers to avoid confusion.
_M_destroy_pback();
- if (__way != ios_base::cur || __off != 0)
- {
- // Sync the internal and external streams.
- const bool __testget = this->_M_in_beg < this->_M_in_end;
- const bool __testput = this->_M_out_beg < this->_M_out_lim;
- off_type __computed_off = __width * __off;
-
- if (__testput || _M_last_overflowed)
- {
- // Part one: update the output sequence.
- this->sync();
-
- // Part two: output unshift sequence.
- _M_output_unshift();
- }
- else if (__testget && __way == ios_base::cur)
- __computed_off += this->_M_in_cur - _M_filepos;
-
- // Return pos_type(off_type(-1)) in case of failure.
- __ret = _M_file.seekoff(__computed_off, __way, __mode);
- _M_set_buffer(0);
- }
- else
+ // 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)
{
- // NB: Need to do this in case _M_file in indeterminate
- // state, ie _M_file._offset == -1
- pos_type __tmp = _M_file.seekoff(__off, ios_base::cur, __mode);
- if (__tmp >= 0)
+ if (_M_codecvt->always_noconv())
+ __computed_off += this->gptr() - this->egptr();
+ else
{
- // Seek successful.
- __ret = __tmp;
- __ret += std::max(this->_M_out_cur, this->_M_in_cur)
- - _M_filepos;
+ // Calculate offset from _M_ext_buf that corresponds
+ // to gptr(). Note: uses _M_state_last, which
+ // corresponds to eback().
+ const int __gptr_off =
+ _M_codecvt->length(_M_state_last, _M_ext_buf, _M_ext_next,
+ this->gptr() - this->eback());
+ __computed_off += _M_ext_buf + __gptr_off - _M_ext_end;
+
+ // _M_state_last is modified by codecvt::length() so
+ // it now corresponds to gptr().
+ __state = _M_state_last;
}
}
+ __ret = _M_seek(__computed_off, __way, __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())
+ {
+ // Returns pos_type(off_type(-1)) in case of failure.
+ __ret = pos_type(_M_file.seekoff(__off, __way));
+ if (__ret != pos_type(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.state(_M_state_cur);
+ }
+ }
+ return __ret;
+ }
+
+ 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)
{
- const bool __testbeg = !this->seekoff(0, ios_base::cur, this->_M_mode);
- const bool __teststate = __check_facet(_M_codecvt).encoding() == -1;
+ bool __testvalid = true;
- if (this->_M_buf_locale != __loc
- && (!this->is_open() || (__testbeg && !__teststate)))
+ 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 (this->is_open())
{
- this->_M_buf_locale = __loc;
- if (__builtin_expect(has_facet<__codecvt_type>(__loc), true))
- _M_codecvt = &use_facet<__codecvt_type>(__loc);
-
- // NB This may require the reconversion of previously
- // converted chars. This in turn may cause the
- // reconstruction of the original file. YIKES!! This
- // implementation interprets this requirement as requiring
- // the file position be at the beginning, and a stateless
- // encoding, or that the filebuf be closed. Opinions may differ.
+ // 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)
+ std::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);
+ }
}
- _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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