X-Git-Url: http://wagnertech.de/git?a=blobdiff_plain;f=i686-linux-gnu-4.7%2Fusr%2Finclude%2Fc%2B%2B%2F4.7%2Fbits%2Ffstream.tcc;fp=i686-linux-gnu-4.7%2Fusr%2Finclude%2Fc%2B%2B%2F4.7%2Fbits%2Ffstream.tcc;h=3d5ca62ad9cda075cb83142b230513e6762cdcd6;hb=94df942c2c7bd3457276fe5b7367623cbb8c1302;hp=0000000000000000000000000000000000000000;hpb=4dd7d9155a920895ff7b1cb6b9c9c676aa62000a;p=cross.git

diff --git a/i686-linux-gnu-4.7/usr/include/c++/4.7/bits/fstream.tcc b/i686-linux-gnu-4.7/usr/include/c++/4.7/bits/fstream.tcc
new file mode 100644
index 0000000..3d5ca62
--- /dev/null
+++ b/i686-linux-gnu-4.7/usr/include/c++/4.7/bits/fstream.tcc
@@ -0,0 +1,984 @@
+// 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