37#pragma GCC system_header
42namespace std _GLIBCXX_VISIBILITY(default)
44_GLIBCXX_BEGIN_NAMESPACE_VERSION
46 template<
typename _CharT,
typename _Traits>
48 basic_filebuf<_CharT, _Traits>::
49 _M_allocate_internal_buffer()
53 if (!_M_buf_allocated && !_M_buf)
55 _M_buf =
new char_type[_M_buf_size];
56 _M_buf_allocated =
true;
60 template<
typename _CharT,
typename _Traits>
62 basic_filebuf<_CharT, _Traits>::
63 _M_destroy_internal_buffer() throw()
69 _M_buf_allocated =
false;
78 template<
typename _CharT,
typename _Traits>
81 _M_mode(
ios_base::openmode(0)), _M_state_beg(), _M_state_cur(),
82 _M_state_last(), _M_buf(0), _M_buf_size(
BUFSIZ),
83 _M_buf_allocated(
false), _M_reading(
false), _M_writing(
false), _M_pback(),
84 _M_pback_cur_save(0), _M_pback_end_save(0), _M_pback_init(
false),
85 _M_codecvt(0), _M_ext_buf(0), _M_ext_buf_size(0), _M_ext_next(0),
92#if __cplusplus >= 201103L
93 template<
typename _CharT,
typename _Traits>
96 : __streambuf_type(
__rhs),
97 _M_lock(), _M_file(
std::move(
__rhs._M_file), &_M_lock),
99 _M_state_beg(
std::move(
__rhs._M_state_beg)),
100 _M_state_cur(
std::move(
__rhs._M_state_cur)),
101 _M_state_last(
std::move(
__rhs._M_state_last)),
103 _M_buf_size(
std::__exchange(
__rhs._M_buf_size, 1)),
104 _M_buf_allocated(
std::__exchange(
__rhs._M_buf_allocated,
false)),
107 _M_pback(
__rhs._M_pback),
111 _M_codecvt(
__rhs._M_codecvt),
113 _M_ext_buf_size(
std::__exchange(
__rhs._M_ext_buf_size, 0)),
117 __rhs._M_set_buffer(-1);
121 template<
typename _CharT,
typename _Traits>
122 basic_filebuf<_CharT, _Traits>&
123 basic_filebuf<_CharT, _Traits>::
124 operator=(basic_filebuf&& __rhs)
127 __streambuf_type::operator=(__rhs);
128 _M_file.swap(__rhs._M_file);
130 _M_state_beg = std::move(__rhs._M_state_beg);
131 _M_state_cur = std::move(__rhs._M_state_cur);
132 _M_state_last = std::move(__rhs._M_state_last);
133 _M_buf = std::__exchange(__rhs._M_buf,
nullptr);
134 _M_buf_size = std::__exchange(__rhs._M_buf_size, 1);
135 _M_buf_allocated = std::__exchange(__rhs._M_buf_allocated,
false);
136 _M_ext_buf = std::__exchange(__rhs._M_ext_buf,
nullptr);
137 _M_ext_buf_size = std::__exchange(__rhs._M_ext_buf_size, 0);
138 _M_ext_next = std::__exchange(__rhs._M_ext_next,
nullptr);
139 _M_ext_end = std::__exchange(__rhs._M_ext_end,
nullptr);
140 _M_reading = std::__exchange(__rhs._M_reading,
false);
141 _M_writing = std::__exchange(__rhs._M_writing,
false);
142 _M_pback_cur_save = std::__exchange(__rhs._M_pback_cur_save,
nullptr);
143 _M_pback_end_save = std::__exchange(__rhs._M_pback_end_save,
nullptr);
144 _M_pback_init = std::__exchange(__rhs._M_pback_init,
false);
145 __rhs._M_set_buffer(-1);
146 __rhs._M_state_last = __rhs._M_state_cur = __rhs._M_state_beg;
150 template<
typename _CharT,
typename _Traits>
152 basic_filebuf<_CharT, _Traits>::
153 swap(basic_filebuf& __rhs)
155 __streambuf_type::swap(__rhs);
156 _M_file.swap(__rhs._M_file);
157 std::swap(_M_mode, __rhs._M_mode);
158 std::swap(_M_state_beg, __rhs._M_state_beg);
159 std::swap(_M_state_cur, __rhs._M_state_cur);
160 std::swap(_M_state_last, __rhs._M_state_last);
161 std::swap(_M_buf, __rhs._M_buf);
162 std::swap(_M_buf_size, __rhs._M_buf_size);
163 std::swap(_M_buf_allocated, __rhs._M_buf_allocated);
164 std::swap(_M_ext_buf, __rhs._M_ext_buf);
165 std::swap(_M_ext_buf_size, __rhs._M_ext_buf_size);
166 std::swap(_M_ext_next, __rhs._M_ext_next);
167 std::swap(_M_ext_end, __rhs._M_ext_end);
168 std::swap(_M_reading, __rhs._M_reading);
169 std::swap(_M_writing, __rhs._M_writing);
170 std::swap(_M_pback_cur_save, __rhs._M_pback_cur_save);
171 std::swap(_M_pback_end_save, __rhs._M_pback_end_save);
172 std::swap(_M_pback_init, __rhs._M_pback_init);
176 template<
typename _CharT,
typename _Traits>
177 typename basic_filebuf<_CharT, _Traits>::__filebuf_type*
182 if (!this->is_open())
187 _M_allocate_internal_buffer();
196 _M_state_last = _M_state_cur = _M_state_beg;
201 == pos_type(off_type(-1)))
210 template<
typename _CharT,
typename _Traits>
215 if (!this->is_open())
228 __fb->_M_pback_init =
false;
229 __fb->_M_destroy_internal_buffer();
230 __fb->_M_reading =
false;
231 __fb->_M_writing =
false;
232 __fb->_M_set_buffer(-1);
233 __fb->_M_state_last =
__fb->_M_state_cur =
__fb->_M_state_beg;
239 if (!_M_terminate_output())
245 __throw_exception_again;
248 { __testfail =
true; }
251 if (!_M_file.close())
260 template<
typename _CharT,
typename _Traits>
271 __ret = this->egptr() - this->gptr();
273#if _GLIBCXX_HAVE_DOS_BASED_FILESYSTEM
276 if (__check_facet(_M_codecvt).encoding() >= 0
279 if (__check_facet(_M_codecvt).encoding() >= 0)
281 __ret += _M_file.showmanyc() / _M_codecvt->max_length();
286 template<
typename _CharT,
typename _Traits>
287 typename basic_filebuf<_CharT, _Traits>::int_type
291 int_type
__ret = traits_type::eof();
297 if (overflow() == traits_type::eof())
307 if (this->gptr() < this->egptr())
308 return traits_type::to_int_type(*this->gptr());
311 const size_t __buflen = _M_buf_size > 1 ? _M_buf_size - 1 : 1;
317 codecvt_base::result __r = codecvt_base::ok;
318 if (__check_facet(_M_codecvt).always_noconv())
320 __ilen = _M_file.xsgetn(
reinterpret_cast<char*
>(this->eback()),
329 const int __enc = _M_codecvt->encoding();
344 if (_M_reading && this->egptr() == this->eback() &&
__remainder)
349 if (_M_ext_buf_size <
__blen)
355 delete [] _M_ext_buf;
362 _M_ext_next = _M_ext_buf;
364 _M_state_last = _M_state_cur;
373 if (_M_ext_end - _M_ext_buf +
__rlen > _M_ext_buf_size)
375 __throw_ios_failure(__N(
"basic_filebuf::underflow "
376 "codecvt::max_length() "
387 char_type*
__iend = this->eback();
388 if (_M_ext_next < _M_ext_end)
389 __r = _M_codecvt->in(_M_state_cur, _M_ext_next,
390 _M_ext_end, _M_ext_next,
393 if (__r == codecvt_base::noconv)
395 size_t __avail = _M_ext_end - _M_ext_buf;
397 traits_type::copy(this->eback(),
398 reinterpret_cast<char_type*
>
408 if (__r == codecvt_base::error)
418 _M_set_buffer(__ilen);
420 __ret = traits_type::to_int_type(*this->gptr());
431 if (__r == codecvt_base::partial)
432 __throw_ios_failure(__N(
"basic_filebuf::underflow "
433 "incomplete character in file"));
435 else if (__r == codecvt_base::error)
436 __throw_ios_failure(__N(
"basic_filebuf::underflow "
437 "invalid byte sequence in file"));
439 __throw_ios_failure(__N(
"basic_filebuf::underflow "
440 "error reading the file"));
445 template<
typename _CharT,
typename _Traits>
446 typename basic_filebuf<_CharT, _Traits>::int_type
450 int_type
__ret = traits_type::eof();
456 if (overflow() == traits_type::eof())
463 const bool __testpb = _M_pback_init;
466 if (this->eback() < this->gptr())
469 __tmp = traits_type::to_int_type(*this->gptr());
471 else if (this->seekoff(-1,
ios_base::cur) != pos_type(off_type(-1)))
473 __tmp = this->underflow();
492 __ret = traits_type::not_eof(__i);
497 *this->gptr() = traits_type::to_char_type(__i);
504 template<
typename _CharT,
typename _Traits>
505 typename basic_filebuf<_CharT, _Traits>::int_type
509 int_type
__ret = traits_type::eof();
518 const int __gptr_off = _M_get_ext_pos(_M_state_last);
520 == pos_type(off_type(-1)))
523 if (this->pbase() < this->pptr())
528 *this->pptr() = traits_type::to_char_type(__c);
534 if (_M_convert_to_external(this->pbase(),
535 this->pptr() - this->pbase()))
538 __ret = traits_type::not_eof(__c);
541 else if (_M_buf_size > 1)
550 *this->pptr() = traits_type::to_char_type(__c);
553 __ret = traits_type::not_eof(__c);
558 char_type
__conv = traits_type::to_char_type(__c);
562 __ret = traits_type::not_eof(__c);
569 template<
typename _CharT,
typename _Traits>
577 if (__check_facet(_M_codecvt).always_noconv())
586 streamsize __blen = __ilen * _M_codecvt->max_length();
587 char* __buf =
static_cast<char*
>(__builtin_alloca(__blen));
590 const char_type* __iend;
591 codecvt_base::result __r;
592 __r = _M_codecvt->out(_M_state_cur, __ibuf, __ibuf + __ilen,
593 __iend, __buf, __buf + __blen, __bend);
595 if (__r == codecvt_base::ok || __r == codecvt_base::partial)
596 __blen = __bend - __buf;
597 else if (__r == codecvt_base::noconv)
600 __buf =
reinterpret_cast<char*
>(__ibuf);
604 __throw_ios_failure(__N(
"basic_filebuf::_M_convert_to_external "
605 "conversion error"));
607 __elen = _M_file.xsputn(__buf, __blen);
611 if (__r == codecvt_base::partial && __elen == __plen)
613 const char_type* __iresume = __iend;
615 __r = _M_codecvt->out(_M_state_cur, __iresume,
616 __iresume + __rlen, __iend, __buf,
617 __buf + __blen, __bend);
618 if (__r != codecvt_base::error)
620 __rlen = __bend - __buf;
621 __elen = _M_file.xsputn(__buf, __rlen);
625 __throw_ios_failure(__N(
"basic_filebuf::_M_convert_to_external "
626 "conversion error"));
629 return __elen == __plen;
632 template<
typename _CharT,
typename _Traits>
641 if (__n > 0 && this->gptr() == this->eback())
643 *
__s++ = *this->gptr();
652 if (overflow() == traits_type::eof())
664 if (__n >
__buflen && __check_facet(_M_codecvt).always_noconv()
671 traits_type::copy(
__s, this->gptr(),
__avail);
673 this->setg(this->eback(), this->gptr() +
__avail,
684 __len = _M_file.xsgetn(
reinterpret_cast<char*
>(
__s),
687 __throw_ios_failure(__N(
"basic_filebuf::xsgetn "
688 "error reading the file"));
715 __ret += __streambuf_type::xsgetn(
__s, __n);
720 template<
typename _CharT,
typename _Traits>
731 if (__check_facet(_M_codecvt).always_noconv()
739 if (!_M_writing && _M_buf_size > 1)
746 const char*
__buf =
reinterpret_cast<const char*
>(this->pbase());
748 reinterpret_cast<const char*
>(
__s),
761 __ret = __streambuf_type::xsputn(
__s, __n);
764 __ret = __streambuf_type::xsputn(
__s, __n);
768 template<
typename _CharT,
typename _Traits>
773 if (!this->is_open())
775 if (
__s == 0 && __n == 0)
777 else if (
__s && __n > 0)
797 template<
typename _CharT,
typename _Traits>
798 typename basic_filebuf<_CharT, _Traits>::pos_type
804 __width = _M_codecvt->encoding();
808 pos_type
__ret = pos_type(off_type(-1));
817 && (!_M_writing || _M_codecvt->always_noconv());
828 __state_type
__state = _M_state_beg;
857 template<
typename _CharT,
typename _Traits>
858 typename basic_filebuf<_CharT, _Traits>::pos_type
862 pos_type
__ret = pos_type(off_type(-1));
872 template<
typename _CharT,
typename _Traits>
873 typename basic_filebuf<_CharT, _Traits>::pos_type
877 pos_type
__ret = pos_type(off_type(-1));
878 if (_M_terminate_output())
885 _M_ext_next = _M_ext_end = _M_ext_buf;
889 __ret.state(_M_state_cur);
898 template<
typename _CharT,
typename _Traits>
899 int basic_filebuf<_CharT, _Traits>::
900 _M_get_ext_pos(__state_type& __state)
902 if (_M_codecvt->always_noconv())
903 return this->gptr() - this->egptr();
909 const int __gptr_off =
910 _M_codecvt->length(__state, _M_ext_buf, _M_ext_next,
911 this->gptr() - this->eback());
912 return _M_ext_buf + __gptr_off - _M_ext_end;
916 template<
typename _CharT,
typename _Traits>
918 basic_filebuf<_CharT, _Traits>::
919 _M_terminate_output()
922 bool __testvalid =
true;
923 if (this->pbase() < this->pptr())
925 const int_type __tmp = this->overflow();
926 if (traits_type::eq_int_type(__tmp, traits_type::eof()))
931 if (_M_writing && !__check_facet(_M_codecvt).always_noconv()
937 const size_t __blen = 128;
939 codecvt_base::result __r;
945 __r = _M_codecvt->unshift(_M_state_cur, __buf,
946 __buf + __blen, __next);
947 if (__r == codecvt_base::error)
949 else if (__r == codecvt_base::ok ||
950 __r == codecvt_base::partial)
952 __ilen = __next - __buf;
955 const streamsize __elen = _M_file.xsputn(__buf, __ilen);
956 if (__elen != __ilen)
961 while (__r == codecvt_base::partial && __ilen > 0 && __testvalid);
969 const int_type __tmp = this->overflow();
970 if (traits_type::eq_int_type(__tmp, traits_type::eof()))
977 template<
typename _CharT,
typename _Traits>
985 if (this->pbase() < this->pptr())
987 const int_type
__tmp = this->overflow();
988 if (traits_type::eq_int_type(
__tmp, traits_type::eof()))
994 template<
typename _CharT,
typename _Traits>
1005 if (this->is_open())
1008 if ((_M_reading || _M_writing)
1009 && __check_facet(_M_codecvt).encoding() == -1)
1015 if (__check_facet(_M_codecvt).always_noconv())
1020 != pos_type(off_type(-1));
1025 _M_ext_next = _M_ext_buf
1026 + _M_codecvt->length(_M_state_last, _M_ext_buf,
1028 this->gptr() - this->eback());
1033 _M_ext_next = _M_ext_buf;
1036 _M_state_last = _M_state_cur = _M_state_beg;
1039 else if (_M_writing && (
__testvalid = _M_terminate_output()))
1052#if _GLIBCXX_EXTERN_TEMPLATE
1058#ifdef _GLIBCXX_USE_WCHAR_T
1066_GLIBCXX_END_NAMESPACE_VERSION
_GLIBCXX14_CONSTEXPR const _Tp & min(const _Tp &, const _Tp &)
This does what you think it does.
ISO C++ entities toplevel namespace is std.
ptrdiff_t streamsize
Integral type for I/O operation counts and buffer sizes.
The actual work of input and output (for files).
virtual pos_type seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode=ios_base::in|ios_base::out)
Alters the stream positions.
virtual int_type underflow()
Fetches more data from the controlled sequence.
virtual streamsize showmanyc()
Investigating the data available.
virtual void imbue(const locale &__loc)
Changes translations.
virtual streamsize xsgetn(char_type *__s, streamsize __n)
Multiple character extraction.
__filebuf_type * close()
Closes the currently associated file.
virtual pos_type seekpos(pos_type __pos, ios_base::openmode __mode=ios_base::in|ios_base::out)
Alters the stream positions.
virtual int_type pbackfail(int_type __c=_Traits::eof())
Tries to back up the input sequence.
virtual streamsize xsputn(const char_type *__s, streamsize __n)
Multiple character insertion.
virtual int_type overflow(int_type __c=_Traits::eof())
Consumes data from the buffer; writes to the controlled sequence.
__filebuf_type * open(const char *__s, ios_base::openmode __mode)
Opens an external file.
basic_filebuf()
Does not open any files.
virtual int sync()
Synchronizes the buffer arrays with the controlled sequences.
virtual __streambuf_type * setbuf(char_type *__s, streamsize __n)
Manipulates the buffer.
locale _M_buf_locale
Current locale setting.
Thrown as part of forced unwinding.
The base of the I/O class hierarchy.
static const seekdir cur
Request a seek relative to the current position within the sequence.
static const seekdir beg
Request a seek relative to the beginning of the stream.
static const seekdir end
Request a seek relative to the current end of the sequence.
static const openmode in
Open for input. Default for ifstream and fstream.
static const openmode out
Open for output. Default for ofstream and fstream.
static const openmode binary
Perform input and output in binary mode (as opposed to text mode). This is probably not what you thin...
_Ios_Openmode openmode
This is a bitmask type.
static const openmode app
Seek to end before each write.
static const openmode ate
Open and seek to end immediately after opening.
Container class for localization functionality.