// File based streams -*- C++ -*-
// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
-// 2007
+// 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, 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
-// 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.
-
-/** @file fstream.tcc
+// 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.
- * You should not attempt to use it directly.
+ * Do not attempt to use it directly. @headername{fstream}
*/
//
#pragma GCC system_header
-#include <cxxabi-forced.h>
+#include <bits/cxxabi_forced.h>
-_GLIBCXX_BEGIN_NAMESPACE(std)
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
template<typename _CharT, typename _Traits>
void
if (_M_buf_allocated)
{
delete [] _M_buf;
- _M_buf = NULL;
+ _M_buf = 0;
_M_buf_allocated = false;
}
delete [] _M_ext_buf;
- _M_ext_buf = NULL;
+ _M_ext_buf = 0;
_M_ext_buf_size = 0;
- _M_ext_next = NULL;
- _M_ext_end = NULL;
+ _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(NULL), _M_buf_size(BUFSIZ),
+ _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),
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);
close()
{
if (!this->is_open())
- return NULL;
+ return 0;
bool __testfail = false;
{
}
} __cs (this);
- try
+ __try
{
if (!_M_terminate_output())
__testfail = true;
}
- catch(__cxxabiv1::__forced_unwind&)
+ __catch(__cxxabiv1::__forced_unwind&)
{
_M_file.close();
__throw_exception_again;
}
- catch(...)
+ __catch(...)
{ __testfail = true; }
}
__testfail = true;
if (__testfail)
- return NULL;
+ return 0;
else
return this;
}
{
int_type __ret = traits_type::eof();
const bool __testin = _M_mode & ios_base::in;
- if (__testin && !_M_writing)
+ if (__testin)
{
- // Check for pback madness, and if so swich back to the
+ 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();
{
int_type __ret = traits_type::eof();
const bool __testin = _M_mode & ios_base::in;
- if (__testin && !_M_writing)
+ 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;
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 && !_M_reading)
+ 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.
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);
+ 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);
+ }
+
+ // 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;
+ }
- 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)
+ 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;
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;
- }
+ {
+ 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;
}
if (__width < 0)
__width = 0;
- pos_type __ret = pos_type(off_type(-1));
+ 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.
- _M_destroy_pback();
+ if (!__no_movement)
+ _M_destroy_pback();
// Correct state at destination. Note that this is the correct
// state for the current position during output, because
off_type __computed_off = __off * __width;
if (_M_reading && __way == ios_base::cur)
{
- if (_M_codecvt->always_noconv())
- __computed_off += this->gptr() - this->egptr();
- else
+ __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))
{
- // 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 = __file_off + __computed_off;
+ __ret.state(__state);
}
}
- __ret = _M_seek(__computed_off, __way, __state);
}
return __ret;
}
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)))
+ 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>::
{
// External position corresponding to gptr().
_M_ext_next = _M_ext_buf
- + _M_codecvt->length(_M_state_last, _M_ext_buf, _M_ext_next,
+ + _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)
// Inhibit implicit instantiations for required instantiations,
// which are defined via explicit instantiations elsewhere.
- // NB: This syntax is a GNU extension.
#if _GLIBCXX_EXTERN_TEMPLATE
extern template class basic_filebuf<char>;
extern template class basic_ifstream<char>;
#endif
#endif
-_GLIBCXX_END_NAMESPACE
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace std
#endif
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