--- /dev/null
+// File based streams -*- C++ -*-
+
+// 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 3, 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.
+
+// 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.
+
+// 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 _FSTREAM_TCC
+#define _FSTREAM_TCC 1
+
+#pragma GCC system_header
+
+#include <bits/cxxabi_forced.h>
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ template<typename _CharT, typename _Traits>
+ void
+ basic_filebuf<_CharT, _Traits>::
+ _M_allocate_internal_buffer()
+ {
+ // 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)
+ {
+ _M_buf = new char_type[_M_buf_size];
+ _M_buf_allocated = true;
+ }
+ }
+
+ template<typename _CharT, typename _Traits>
+ void
+ basic_filebuf<_CharT, _Traits>::
+ _M_destroy_internal_buffer() throw()
+ {
+ if (_M_buf_allocated)
+ {
+ delete [] _M_buf;
+ _M_buf = 0;
+ _M_buf_allocated = false;
+ }
+ 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_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*
+ basic_filebuf<_CharT, _Traits>::
+ open(const char* __s, ios_base::openmode __mode)
+ {
+ __filebuf_type *__ret = 0;
+ if (!this->is_open())
+ {
+ _M_file.open(__s, __mode);
+ if (this->is_open())
+ {
+ _M_allocate_internal_buffer();
+ _M_mode = __mode;
+
+ // 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;
+
+ // 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*
+ basic_filebuf<_CharT, _Traits>::
+ close()
+ {
+ if (!this->is_open())
+ return 0;
+
+ 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
+ basic_filebuf<_CharT, _Traits>::
+ showmanyc()
+ {
+ streamsize __ret = -1;
+ 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->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
+ basic_filebuf<_CharT, _Traits>::
+ underflow()
+ {
+ 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;
+ }
+ // 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
+ {
+ __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)
+ {
+ 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 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
+ {
+ 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 = 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
+ __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"));
+ }
+ 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();
+ 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();
+ const bool __testeof = traits_type::eq_int_type(__c, __ret);
+ const bool __testout = _M_mode & ios_base::out;
+ if (__testout)
+ {
+ 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())
+ {
+ // 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
+ {
+ // 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);
+ }
+ }
+ }
+ 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;
+ streamsize __plen;
+ if (__check_facet(_M_codecvt).always_noconv())
+ {
+ __elen = _M_file.xsputn(reinterpret_cast<char*>(__ibuf), __ilen);
+ __plen = __ilen;
+ }
+ else
+ {
+ // Worst-case number of external bytes needed.
+ // 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)
+ {
+ // Same as the always_noconv case above.
+ __buf = reinterpret_cast<char*>(__ibuf);
+ __blen = __ilen;
+ }
+ 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 && __elen == __plen)
+ {
+ const char_type* __iresume = __iend;
+ 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;
+ __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>
+ 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(); // 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)
+ {
+ traits_type::copy(__s, this->gptr(), __avail);
+ __s += __avail;
+ this->setg(this->eback(), this->gptr() + __avail,
+ this->egptr());
+ __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)
+ {
+ 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();
+
+ // 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*
+ basic_filebuf<_CharT, _Traits>::
+ setbuf(char_type* __s, streamsize __n)
+ {
+ 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)
+ {
+ int __width = 0;
+ if (_M_codecvt)
+ __width = _M_codecvt->encoding();
+ if (__width < 0)
+ __width = 0;
+
+ 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());
+
+ // 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);
+ }
+ if (!__no_movement)
+ __ret = _M_seek(__computed_off, __way, __state);
+ else
+ {
+ 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))
+ {
+ __ret = __file_off + __computed_off;
+ __ret.state(__state);
+ }
+ }
+ }
+ 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)
+ {
+ 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>
+ typename basic_filebuf<_CharT, _Traits>::pos_type
+ basic_filebuf<_CharT, _Traits>::
+ _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 __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 (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);
+ }
+ }
+
+ if (__testvalid)
+ _M_codecvt = _M_codecvt_tmp;
+ else
+ _M_codecvt = 0;
+ }
+
+ // Inhibit implicit instantiations for required instantiations,
+ // which are defined via explicit instantiations elsewhere.
+#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 _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
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace std
+
+#endif
projects / cross.git / blobdiff