1// -*- C++ -*- 2//===----------------------------------------------------------------------===// 3// 4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5// See https://llvm.org/LICENSE.txt for license information. 6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7// 8//===----------------------------------------------------------------------===// 9 10#ifndef _LIBCPP_FSTREAM 11#define _LIBCPP_FSTREAM 12 13/* 14 fstream synopsis 15 16template <class charT, class traits = char_traits<charT> > 17class basic_filebuf 18 : public basic_streambuf<charT, traits> 19{ 20public: 21 typedef charT char_type; 22 typedef traits traits_type; 23 typedef typename traits_type::int_type int_type; 24 typedef typename traits_type::pos_type pos_type; 25 typedef typename traits_type::off_type off_type; 26 27 // 27.9.1.2 Constructors/destructor: 28 basic_filebuf(); 29 basic_filebuf(basic_filebuf&& rhs); 30 virtual ~basic_filebuf(); 31 32 // 27.9.1.3 Assign/swap: 33 basic_filebuf& operator=(basic_filebuf&& rhs); 34 void swap(basic_filebuf& rhs); 35 36 // 27.9.1.4 Members: 37 bool is_open() const; 38 basic_filebuf* open(const char* s, ios_base::openmode mode); 39 basic_filebuf* open(const string& s, ios_base::openmode mode); 40 basic_filebuf* open(const filesystem::path& p, ios_base::openmode mode); // C++17 41 basic_filebuf* close(); 42 43protected: 44 // 27.9.1.5 Overridden virtual functions: 45 virtual streamsize showmanyc(); 46 virtual int_type underflow(); 47 virtual int_type uflow(); 48 virtual int_type pbackfail(int_type c = traits_type::eof()); 49 virtual int_type overflow (int_type c = traits_type::eof()); 50 virtual basic_streambuf<char_type, traits_type>* setbuf(char_type* s, streamsize n); 51 virtual pos_type seekoff(off_type off, ios_base::seekdir way, 52 ios_base::openmode which = ios_base::in | ios_base::out); 53 virtual pos_type seekpos(pos_type sp, 54 ios_base::openmode which = ios_base::in | ios_base::out); 55 virtual int sync(); 56 virtual void imbue(const locale& loc); 57}; 58 59template <class charT, class traits> 60 void 61 swap(basic_filebuf<charT, traits>& x, basic_filebuf<charT, traits>& y); 62 63typedef basic_filebuf<char> filebuf; 64typedef basic_filebuf<wchar_t> wfilebuf; 65 66template <class charT, class traits = char_traits<charT> > 67class basic_ifstream 68 : public basic_istream<charT,traits> 69{ 70public: 71 typedef charT char_type; 72 typedef traits traits_type; 73 typedef typename traits_type::int_type int_type; 74 typedef typename traits_type::pos_type pos_type; 75 typedef typename traits_type::off_type off_type; 76 using native_handle_type = typename basic_filebuf<charT, traits>::native_handle_type; // Since C++26 77 78 basic_ifstream(); 79 explicit basic_ifstream(const char* s, ios_base::openmode mode = ios_base::in); 80 explicit basic_ifstream(const string& s, ios_base::openmode mode = ios_base::in); 81 explicit basic_ifstream(const filesystem::path& p, 82 ios_base::openmode mode = ios_base::in); // C++17 83 basic_ifstream(basic_ifstream&& rhs); 84 85 basic_ifstream& operator=(basic_ifstream&& rhs); 86 void swap(basic_ifstream& rhs); 87 88 basic_filebuf<char_type, traits_type>* rdbuf() const; 89 native_handle_type native_handle() const noexcept; // Since C++26 90 bool is_open() const; 91 void open(const char* s, ios_base::openmode mode = ios_base::in); 92 void open(const string& s, ios_base::openmode mode = ios_base::in); 93 void open(const filesystem::path& s, ios_base::openmode mode = ios_base::in); // C++17 94 95 void close(); 96}; 97 98template <class charT, class traits> 99 void 100 swap(basic_ifstream<charT, traits>& x, basic_ifstream<charT, traits>& y); 101 102typedef basic_ifstream<char> ifstream; 103typedef basic_ifstream<wchar_t> wifstream; 104 105template <class charT, class traits = char_traits<charT> > 106class basic_ofstream 107 : public basic_ostream<charT,traits> 108{ 109public: 110 typedef charT char_type; 111 typedef traits traits_type; 112 typedef typename traits_type::int_type int_type; 113 typedef typename traits_type::pos_type pos_type; 114 typedef typename traits_type::off_type off_type; 115 using native_handle_type = typename basic_filebuf<charT, traits>::native_handle_type; // Since C++26 116 117 basic_ofstream(); 118 explicit basic_ofstream(const char* s, ios_base::openmode mode = ios_base::out); 119 explicit basic_ofstream(const string& s, ios_base::openmode mode = ios_base::out); 120 explicit basic_ofstream(const filesystem::path& p, 121 ios_base::openmode mode = ios_base::out); // C++17 122 basic_ofstream(basic_ofstream&& rhs); 123 124 basic_ofstream& operator=(basic_ofstream&& rhs); 125 void swap(basic_ofstream& rhs); 126 127 basic_filebuf<char_type, traits_type>* rdbuf() const; 128 native_handle_type native_handle() const noexcept; // Since C++26 129 130 bool is_open() const; 131 void open(const char* s, ios_base::openmode mode = ios_base::out); 132 void open(const string& s, ios_base::openmode mode = ios_base::out); 133 void open(const filesystem::path& p, 134 ios_base::openmode mode = ios_base::out); // C++17 135 136 void close(); 137}; 138 139template <class charT, class traits> 140 void 141 swap(basic_ofstream<charT, traits>& x, basic_ofstream<charT, traits>& y); 142 143typedef basic_ofstream<char> ofstream; 144typedef basic_ofstream<wchar_t> wofstream; 145 146template <class charT, class traits=char_traits<charT> > 147class basic_fstream 148 : public basic_iostream<charT,traits> 149{ 150public: 151 typedef charT char_type; 152 typedef traits traits_type; 153 typedef typename traits_type::int_type int_type; 154 typedef typename traits_type::pos_type pos_type; 155 typedef typename traits_type::off_type off_type; 156 using native_handle_type = typename basic_filebuf<charT, traits>::native_handle_type; // Since C++26 157 158 basic_fstream(); 159 explicit basic_fstream(const char* s, ios_base::openmode mode = ios_base::in|ios_base::out); 160 explicit basic_fstream(const string& s, ios_base::openmode mode = ios_base::in|ios_base::out); 161 explicit basic_fstream(const filesystem::path& p, 162 ios_base::openmode mode = ios_base::in|ios_base::out); C++17 163 basic_fstream(basic_fstream&& rhs); 164 165 basic_fstream& operator=(basic_fstream&& rhs); 166 void swap(basic_fstream& rhs); 167 168 basic_filebuf<char_type, traits_type>* rdbuf() const; 169 native_handle_type native_handle() const noexcept; // Since C++26 170 bool is_open() const; 171 void open(const char* s, ios_base::openmode mode = ios_base::in|ios_base::out); 172 void open(const string& s, ios_base::openmode mode = ios_base::in|ios_base::out); 173 void open(const filesystem::path& s, 174 ios_base::openmode mode = ios_base::in|ios_base::out); // C++17 175 176 void close(); 177}; 178 179template <class charT, class traits> 180 void swap(basic_fstream<charT, traits>& x, basic_fstream<charT, traits>& y); 181 182typedef basic_fstream<char> fstream; 183typedef basic_fstream<wchar_t> wfstream; 184 185} // std 186 187*/ 188 189#include <__algorithm/max.h> 190#include <__assert> 191#include <__availability> 192#include <__config> 193#include <__fwd/fstream.h> 194#include <__locale> 195#include <__utility/move.h> 196#include <__utility/swap.h> 197#include <__utility/unreachable.h> 198#include <cstdio> 199#include <filesystem> 200#include <istream> 201#include <ostream> 202#include <typeinfo> 203#include <version> 204 205#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 206# pragma GCC system_header 207#endif 208 209_LIBCPP_PUSH_MACROS 210#include <__undef_macros> 211 212#if defined(_LIBCPP_MSVCRT) || defined(_NEWLIB_VERSION) 213# define _LIBCPP_HAS_NO_OFF_T_FUNCTIONS 214#endif 215 216#if !defined(_LIBCPP_HAS_NO_FILESYSTEM) 217 218_LIBCPP_BEGIN_NAMESPACE_STD 219 220# if _LIBCPP_STD_VER >= 26 && defined(_LIBCPP_WIN32API) 221_LIBCPP_EXPORTED_FROM_ABI void* __filebuf_windows_native_handle(FILE* __file) noexcept; 222# endif 223 224template <class _CharT, class _Traits> 225class _LIBCPP_TEMPLATE_VIS basic_filebuf : public basic_streambuf<_CharT, _Traits> { 226public: 227 typedef _CharT char_type; 228 typedef _Traits traits_type; 229 typedef typename traits_type::int_type int_type; 230 typedef typename traits_type::pos_type pos_type; 231 typedef typename traits_type::off_type off_type; 232 typedef typename traits_type::state_type state_type; 233# if _LIBCPP_STD_VER >= 26 234# if defined(_LIBCPP_WIN32API) 235 using native_handle_type = void*; // HANDLE 236# elif __has_include(<unistd.h>) 237 using native_handle_type = int; // POSIX file descriptor 238# else 239# error "Provide a native file handle!" 240# endif 241# endif 242 243 // 27.9.1.2 Constructors/destructor: 244 basic_filebuf(); 245 basic_filebuf(basic_filebuf&& __rhs); 246 ~basic_filebuf() override; 247 248 // 27.9.1.3 Assign/swap: 249 _LIBCPP_HIDE_FROM_ABI basic_filebuf& operator=(basic_filebuf&& __rhs); 250 void swap(basic_filebuf& __rhs); 251 252 // 27.9.1.4 Members: 253 _LIBCPP_HIDE_FROM_ABI bool is_open() const; 254 basic_filebuf* open(const char* __s, ios_base::openmode __mode); 255# ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR 256 basic_filebuf* open(const wchar_t* __s, ios_base::openmode __mode); 257# endif 258 _LIBCPP_HIDE_FROM_ABI basic_filebuf* open(const string& __s, ios_base::openmode __mode); 259 260# if _LIBCPP_STD_VER >= 17 261 _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_HIDE_FROM_ABI basic_filebuf* 262 open(const filesystem::path& __p, ios_base::openmode __mode) { 263 return open(__p.c_str(), __mode); 264 } 265# endif 266 _LIBCPP_HIDE_FROM_ABI basic_filebuf* __open(int __fd, ios_base::openmode __mode); 267 basic_filebuf* close(); 268# if _LIBCPP_STD_VER >= 26 269 _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() const noexcept { 270 _LIBCPP_ASSERT_UNCATEGORIZED(this->is_open(), "File must be opened"); 271# if defined(_LIBCPP_WIN32API) 272 return std::__filebuf_windows_native_handle(__file_); 273# elif __has_include(<unistd.h>) 274 return fileno(__file_); 275# else 276# error "Provide a way to determine the file native handle!" 277# endif 278 } 279# endif // _LIBCPP_STD_VER >= 26 280 281 _LIBCPP_HIDE_FROM_ABI inline static const char* __make_mdstring(ios_base::openmode __mode) _NOEXCEPT; 282# ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR 283 _LIBCPP_HIDE_FROM_ABI inline static const wchar_t* __make_mdwstring(ios_base::openmode __mode) _NOEXCEPT; 284# endif 285 286protected: 287 // 27.9.1.5 Overridden virtual functions: 288 int_type underflow() override; 289 int_type pbackfail(int_type __c = traits_type::eof()) override; 290 int_type overflow(int_type __c = traits_type::eof()) override; 291 basic_streambuf<char_type, traits_type>* setbuf(char_type* __s, streamsize __n) override; 292 pos_type 293 seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __wch = ios_base::in | ios_base::out) override; 294 pos_type seekpos(pos_type __sp, ios_base::openmode __wch = ios_base::in | ios_base::out) override; 295 int sync() override; 296 void imbue(const locale& __loc) override; 297 298private: 299 char* __extbuf_; 300 const char* __extbufnext_; 301 const char* __extbufend_; 302 char __extbuf_min_[8]; 303 size_t __ebs_; 304 char_type* __intbuf_; 305 size_t __ibs_; 306 FILE* __file_; 307 const codecvt<char_type, char, state_type>* __cv_; 308 state_type __st_; 309 state_type __st_last_; 310 ios_base::openmode __om_; 311 // There have been no file operations yet, which allows setting unbuffered 312 // I/O mode. 313 static const ios_base::openmode __no_io_operations = ios_base::trunc; 314 // Unbuffered I/O mode has been requested. 315 static const ios_base::openmode __use_unbuffered_io = ios_base::ate; 316 // Used to track the currently used mode and track whether the output should 317 // be unbuffered. 318 // [filebuf.virtuals]/12 319 // If setbuf(0, 0) is called on a stream before any I/O has occurred on 320 // that stream, the stream becomes unbuffered. Otherwise the results are 321 // implementation-defined. 322 // This allows calling setbuf(0, 0) 323 // - before opening a file, 324 // - after opening a file, before 325 // - a read 326 // - a write 327 // - a seek. 328 // Note that opening a file with ios_base::ate does a seek operation. 329 // Normally underflow, overflow, and sync change this flag to ios_base::in, 330 // ios_base_out, or 0. 331 // 332 // The ios_base::trunc and ios_base::ate flags are not used in __cm_. They 333 // are used to track the state of the unbuffered request. For readability 334 // they have the aliases __no_io_operations and __use_unbuffered_io 335 // respectively. 336 // 337 // The __no_io_operations and __use_unbuffered_io flags are used in the 338 // following way: 339 // - __no_io_operations is set upon construction to indicate the unbuffered 340 // state can be set. 341 // - When requesting unbuffered output: 342 // - If the file is open it sets the mode. 343 // - Else places a request by adding the __use_unbuffered_io flag. 344 // - When a file is opened it checks whether both __no_io_operations and 345 // __use_unbuffered_io are set. If so switches to unbuffered mode. 346 // - All file I/O operations change the mode effectively clearing the 347 // __no_io_operations and __use_unbuffered_io flags. 348 ios_base::openmode __cm_; 349 bool __owns_eb_; 350 bool __owns_ib_; 351 bool __always_noconv_; 352 353 bool __read_mode(); 354 void __write_mode(); 355 356 _LIBCPP_EXPORTED_FROM_ABI friend FILE* __get_ostream_file(ostream&); 357 358 // There are multiple (__)open function, they use different C-API open 359 // function. After that call these functions behave the same. This function 360 // does that part and determines the final return value. 361 _LIBCPP_HIDE_FROM_ABI basic_filebuf* __do_open(FILE* __file, ios_base::openmode __mode) { 362 __file_ = __file; 363 if (!__file_) 364 return nullptr; 365 366 __om_ = __mode; 367 if (__cm_ == (__no_io_operations | __use_unbuffered_io)) { 368 std::setbuf(__file_, nullptr); 369 __cm_ = 0; 370 } 371 372 if (__mode & ios_base::ate) { 373 __cm_ = 0; 374 if (fseek(__file_, 0, SEEK_END)) { 375 fclose(__file_); 376 __file_ = nullptr; 377 return nullptr; 378 } 379 } 380 381 return this; 382 } 383 384 // If the file is already open, switch to unbuffered mode. Otherwise, record 385 // the request to use unbuffered mode so that we use that mode when we 386 // eventually open the file. 387 _LIBCPP_HIDE_FROM_ABI void __request_unbuffered_mode(char_type* __s, streamsize __n) { 388 if (__cm_ == __no_io_operations && __s == nullptr && __n == 0) { 389 if (__file_) { 390 std::setbuf(__file_, nullptr); 391 __cm_ = 0; 392 } else { 393 __cm_ = __no_io_operations | __use_unbuffered_io; 394 } 395 } 396 } 397}; 398 399template <class _CharT, class _Traits> 400basic_filebuf<_CharT, _Traits>::basic_filebuf() 401 : __extbuf_(nullptr), 402 __extbufnext_(nullptr), 403 __extbufend_(nullptr), 404 __ebs_(0), 405 __intbuf_(nullptr), 406 __ibs_(0), 407 __file_(nullptr), 408 __cv_(nullptr), 409 __st_(), 410 __st_last_(), 411 __om_(0), 412 __cm_(__no_io_operations), 413 __owns_eb_(false), 414 __owns_ib_(false), 415 __always_noconv_(false) { 416 if (std::has_facet<codecvt<char_type, char, state_type> >(this->getloc())) { 417 __cv_ = &std::use_facet<codecvt<char_type, char, state_type> >(this->getloc()); 418 __always_noconv_ = __cv_->always_noconv(); 419 } 420 setbuf(nullptr, 4096); 421} 422 423template <class _CharT, class _Traits> 424basic_filebuf<_CharT, _Traits>::basic_filebuf(basic_filebuf&& __rhs) : basic_streambuf<_CharT, _Traits>(__rhs) { 425 if (__rhs.__extbuf_ == __rhs.__extbuf_min_) { 426 __extbuf_ = __extbuf_min_; 427 __extbufnext_ = __extbuf_ + (__rhs.__extbufnext_ - __rhs.__extbuf_); 428 __extbufend_ = __extbuf_ + (__rhs.__extbufend_ - __rhs.__extbuf_); 429 } else { 430 __extbuf_ = __rhs.__extbuf_; 431 __extbufnext_ = __rhs.__extbufnext_; 432 __extbufend_ = __rhs.__extbufend_; 433 } 434 __ebs_ = __rhs.__ebs_; 435 __intbuf_ = __rhs.__intbuf_; 436 __ibs_ = __rhs.__ibs_; 437 __file_ = __rhs.__file_; 438 __cv_ = __rhs.__cv_; 439 __st_ = __rhs.__st_; 440 __st_last_ = __rhs.__st_last_; 441 __om_ = __rhs.__om_; 442 __cm_ = __rhs.__cm_; 443 __owns_eb_ = __rhs.__owns_eb_; 444 __owns_ib_ = __rhs.__owns_ib_; 445 __always_noconv_ = __rhs.__always_noconv_; 446 if (__rhs.pbase()) { 447 if (__rhs.pbase() == __rhs.__intbuf_) 448 this->setp(__intbuf_, __intbuf_ + (__rhs.epptr() - __rhs.pbase())); 449 else 450 this->setp((char_type*)__extbuf_, (char_type*)__extbuf_ + (__rhs.epptr() - __rhs.pbase())); 451 this->__pbump(__rhs.pptr() - __rhs.pbase()); 452 } else if (__rhs.eback()) { 453 if (__rhs.eback() == __rhs.__intbuf_) 454 this->setg(__intbuf_, __intbuf_ + (__rhs.gptr() - __rhs.eback()), __intbuf_ + (__rhs.egptr() - __rhs.eback())); 455 else 456 this->setg((char_type*)__extbuf_, 457 (char_type*)__extbuf_ + (__rhs.gptr() - __rhs.eback()), 458 (char_type*)__extbuf_ + (__rhs.egptr() - __rhs.eback())); 459 } 460 __rhs.__extbuf_ = nullptr; 461 __rhs.__extbufnext_ = nullptr; 462 __rhs.__extbufend_ = nullptr; 463 __rhs.__ebs_ = 0; 464 __rhs.__intbuf_ = 0; 465 __rhs.__ibs_ = 0; 466 __rhs.__file_ = nullptr; 467 __rhs.__st_ = state_type(); 468 __rhs.__st_last_ = state_type(); 469 __rhs.__om_ = 0; 470 __rhs.__cm_ = 0; 471 __rhs.__owns_eb_ = false; 472 __rhs.__owns_ib_ = false; 473 __rhs.setg(0, 0, 0); 474 __rhs.setp(0, 0); 475} 476 477template <class _CharT, class _Traits> 478inline basic_filebuf<_CharT, _Traits>& basic_filebuf<_CharT, _Traits>::operator=(basic_filebuf&& __rhs) { 479 close(); 480 swap(__rhs); 481 return *this; 482} 483 484template <class _CharT, class _Traits> 485basic_filebuf<_CharT, _Traits>::~basic_filebuf() { 486# ifndef _LIBCPP_HAS_NO_EXCEPTIONS 487 try { 488# endif // _LIBCPP_HAS_NO_EXCEPTIONS 489 close(); 490# ifndef _LIBCPP_HAS_NO_EXCEPTIONS 491 } catch (...) { 492 } 493# endif // _LIBCPP_HAS_NO_EXCEPTIONS 494 if (__owns_eb_) 495 delete[] __extbuf_; 496 if (__owns_ib_) 497 delete[] __intbuf_; 498} 499 500template <class _CharT, class _Traits> 501void basic_filebuf<_CharT, _Traits>::swap(basic_filebuf& __rhs) { 502 basic_streambuf<char_type, traits_type>::swap(__rhs); 503 if (__extbuf_ != __extbuf_min_ && __rhs.__extbuf_ != __rhs.__extbuf_min_) { 504 // Neither *this nor __rhs uses the small buffer, so we can simply swap the pointers. 505 std::swap(__extbuf_, __rhs.__extbuf_); 506 std::swap(__extbufnext_, __rhs.__extbufnext_); 507 std::swap(__extbufend_, __rhs.__extbufend_); 508 } else { 509 ptrdiff_t __ln = __extbufnext_ ? __extbufnext_ - __extbuf_ : 0; 510 ptrdiff_t __le = __extbufend_ ? __extbufend_ - __extbuf_ : 0; 511 ptrdiff_t __rn = __rhs.__extbufnext_ ? __rhs.__extbufnext_ - __rhs.__extbuf_ : 0; 512 ptrdiff_t __re = __rhs.__extbufend_ ? __rhs.__extbufend_ - __rhs.__extbuf_ : 0; 513 if (__extbuf_ == __extbuf_min_ && __rhs.__extbuf_ != __rhs.__extbuf_min_) { 514 // *this uses the small buffer, but __rhs doesn't. 515 __extbuf_ = __rhs.__extbuf_; 516 __rhs.__extbuf_ = __rhs.__extbuf_min_; 517 std::memmove(__rhs.__extbuf_min_, __extbuf_min_, sizeof(__extbuf_min_)); 518 } else if (__extbuf_ != __extbuf_min_ && __rhs.__extbuf_ == __rhs.__extbuf_min_) { 519 // *this doesn't use the small buffer, but __rhs does. 520 __rhs.__extbuf_ = __extbuf_; 521 __extbuf_ = __extbuf_min_; 522 std::memmove(__extbuf_min_, __rhs.__extbuf_min_, sizeof(__extbuf_min_)); 523 } else { 524 // Both *this and __rhs use the small buffer. 525 char __tmp[sizeof(__extbuf_min_)]; 526 std::memmove(__tmp, __extbuf_min_, sizeof(__extbuf_min_)); 527 std::memmove(__extbuf_min_, __rhs.__extbuf_min_, sizeof(__extbuf_min_)); 528 std::memmove(__rhs.__extbuf_min_, __tmp, sizeof(__extbuf_min_)); 529 } 530 __extbufnext_ = __extbuf_ + __rn; 531 __extbufend_ = __extbuf_ + __re; 532 __rhs.__extbufnext_ = __rhs.__extbuf_ + __ln; 533 __rhs.__extbufend_ = __rhs.__extbuf_ + __le; 534 } 535 std::swap(__ebs_, __rhs.__ebs_); 536 std::swap(__intbuf_, __rhs.__intbuf_); 537 std::swap(__ibs_, __rhs.__ibs_); 538 std::swap(__file_, __rhs.__file_); 539 std::swap(__cv_, __rhs.__cv_); 540 std::swap(__st_, __rhs.__st_); 541 std::swap(__st_last_, __rhs.__st_last_); 542 std::swap(__om_, __rhs.__om_); 543 std::swap(__cm_, __rhs.__cm_); 544 std::swap(__owns_eb_, __rhs.__owns_eb_); 545 std::swap(__owns_ib_, __rhs.__owns_ib_); 546 std::swap(__always_noconv_, __rhs.__always_noconv_); 547 if (this->eback() == (char_type*)__rhs.__extbuf_min_) { 548 ptrdiff_t __n = this->gptr() - this->eback(); 549 ptrdiff_t __e = this->egptr() - this->eback(); 550 this->setg((char_type*)__extbuf_min_, (char_type*)__extbuf_min_ + __n, (char_type*)__extbuf_min_ + __e); 551 } else if (this->pbase() == (char_type*)__rhs.__extbuf_min_) { 552 ptrdiff_t __n = this->pptr() - this->pbase(); 553 ptrdiff_t __e = this->epptr() - this->pbase(); 554 this->setp((char_type*)__extbuf_min_, (char_type*)__extbuf_min_ + __e); 555 this->__pbump(__n); 556 } 557 if (__rhs.eback() == (char_type*)__extbuf_min_) { 558 ptrdiff_t __n = __rhs.gptr() - __rhs.eback(); 559 ptrdiff_t __e = __rhs.egptr() - __rhs.eback(); 560 __rhs.setg( 561 (char_type*)__rhs.__extbuf_min_, (char_type*)__rhs.__extbuf_min_ + __n, (char_type*)__rhs.__extbuf_min_ + __e); 562 } else if (__rhs.pbase() == (char_type*)__extbuf_min_) { 563 ptrdiff_t __n = __rhs.pptr() - __rhs.pbase(); 564 ptrdiff_t __e = __rhs.epptr() - __rhs.pbase(); 565 __rhs.setp((char_type*)__rhs.__extbuf_min_, (char_type*)__rhs.__extbuf_min_ + __e); 566 __rhs.__pbump(__n); 567 } 568} 569 570template <class _CharT, class _Traits> 571inline _LIBCPP_HIDE_FROM_ABI void swap(basic_filebuf<_CharT, _Traits>& __x, basic_filebuf<_CharT, _Traits>& __y) { 572 __x.swap(__y); 573} 574 575template <class _CharT, class _Traits> 576inline bool basic_filebuf<_CharT, _Traits>::is_open() const { 577 return __file_ != nullptr; 578} 579 580template <class _CharT, class _Traits> 581const char* basic_filebuf<_CharT, _Traits>::__make_mdstring(ios_base::openmode __mode) _NOEXCEPT { 582 switch (__mode & ~ios_base::ate) { 583 case ios_base::out: 584 case ios_base::out | ios_base::trunc: 585 return "w" _LIBCPP_FOPEN_CLOEXEC_MODE; 586 case ios_base::out | ios_base::app: 587 case ios_base::app: 588 return "a" _LIBCPP_FOPEN_CLOEXEC_MODE; 589 case ios_base::in: 590 return "r" _LIBCPP_FOPEN_CLOEXEC_MODE; 591 case ios_base::in | ios_base::out: 592 return "r+" _LIBCPP_FOPEN_CLOEXEC_MODE; 593 case ios_base::in | ios_base::out | ios_base::trunc: 594 return "w+" _LIBCPP_FOPEN_CLOEXEC_MODE; 595 case ios_base::in | ios_base::out | ios_base::app: 596 case ios_base::in | ios_base::app: 597 return "a+" _LIBCPP_FOPEN_CLOEXEC_MODE; 598 case ios_base::out | ios_base::binary: 599 case ios_base::out | ios_base::trunc | ios_base::binary: 600 return "wb" _LIBCPP_FOPEN_CLOEXEC_MODE; 601 case ios_base::out | ios_base::app | ios_base::binary: 602 case ios_base::app | ios_base::binary: 603 return "ab" _LIBCPP_FOPEN_CLOEXEC_MODE; 604 case ios_base::in | ios_base::binary: 605 return "rb" _LIBCPP_FOPEN_CLOEXEC_MODE; 606 case ios_base::in | ios_base::out | ios_base::binary: 607 return "r+b" _LIBCPP_FOPEN_CLOEXEC_MODE; 608 case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary: 609 return "w+b" _LIBCPP_FOPEN_CLOEXEC_MODE; 610 case ios_base::in | ios_base::out | ios_base::app | ios_base::binary: 611 case ios_base::in | ios_base::app | ios_base::binary: 612 return "a+b" _LIBCPP_FOPEN_CLOEXEC_MODE; 613# if _LIBCPP_STD_VER >= 23 614 case ios_base::out | ios_base::noreplace: 615 case ios_base::out | ios_base::trunc | ios_base::noreplace: 616 return "wx" _LIBCPP_FOPEN_CLOEXEC_MODE; 617 case ios_base::in | ios_base::out | ios_base::trunc | ios_base::noreplace: 618 return "w+x" _LIBCPP_FOPEN_CLOEXEC_MODE; 619 case ios_base::out | ios_base::binary | ios_base::noreplace: 620 case ios_base::out | ios_base::trunc | ios_base::binary | ios_base::noreplace: 621 return "wbx" _LIBCPP_FOPEN_CLOEXEC_MODE; 622 case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary | ios_base::noreplace: 623 return "w+bx" _LIBCPP_FOPEN_CLOEXEC_MODE; 624# endif // _LIBCPP_STD_VER >= 23 625 default: 626 return nullptr; 627 } 628 __libcpp_unreachable(); 629} 630 631# ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR 632template <class _CharT, class _Traits> 633const wchar_t* basic_filebuf<_CharT, _Traits>::__make_mdwstring(ios_base::openmode __mode) _NOEXCEPT { 634 switch (__mode & ~ios_base::ate) { 635 case ios_base::out: 636 case ios_base::out | ios_base::trunc: 637 return L"w"; 638 case ios_base::out | ios_base::app: 639 case ios_base::app: 640 return L"a"; 641 case ios_base::in: 642 return L"r"; 643 case ios_base::in | ios_base::out: 644 return L"r+"; 645 case ios_base::in | ios_base::out | ios_base::trunc: 646 return L"w+"; 647 case ios_base::in | ios_base::out | ios_base::app: 648 case ios_base::in | ios_base::app: 649 return L"a+"; 650 case ios_base::out | ios_base::binary: 651 case ios_base::out | ios_base::trunc | ios_base::binary: 652 return L"wb"; 653 case ios_base::out | ios_base::app | ios_base::binary: 654 case ios_base::app | ios_base::binary: 655 return L"ab"; 656 case ios_base::in | ios_base::binary: 657 return L"rb"; 658 case ios_base::in | ios_base::out | ios_base::binary: 659 return L"r+b"; 660 case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary: 661 return L"w+b"; 662 case ios_base::in | ios_base::out | ios_base::app | ios_base::binary: 663 case ios_base::in | ios_base::app | ios_base::binary: 664 return L"a+b"; 665# if _LIBCPP_STD_VER >= 23 666 case ios_base::out | ios_base::noreplace: 667 case ios_base::out | ios_base::trunc | ios_base::noreplace: 668 return L"wx"; 669 case ios_base::in | ios_base::out | ios_base::trunc | ios_base::noreplace: 670 return L"w+x"; 671 case ios_base::out | ios_base::binary | ios_base::noreplace: 672 case ios_base::out | ios_base::trunc | ios_base::binary | ios_base::noreplace: 673 return L"wbx"; 674 case ios_base::in | ios_base::out | ios_base::trunc | ios_base::binary | ios_base::noreplace: 675 return L"w+bx"; 676# endif // _LIBCPP_STD_VER >= 23 677 default: 678 return nullptr; 679 } 680 __libcpp_unreachable(); 681} 682# endif 683 684template <class _CharT, class _Traits> 685basic_filebuf<_CharT, _Traits>* basic_filebuf<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode) { 686 if (__file_) 687 return nullptr; 688 const char* __mdstr = __make_mdstring(__mode); 689 if (!__mdstr) 690 return nullptr; 691 692 return __do_open(fopen(__s, __mdstr), __mode); 693} 694 695template <class _CharT, class _Traits> 696inline basic_filebuf<_CharT, _Traits>* basic_filebuf<_CharT, _Traits>::__open(int __fd, ios_base::openmode __mode) { 697 if (__file_) 698 return nullptr; 699 const char* __mdstr = __make_mdstring(__mode); 700 if (!__mdstr) 701 return nullptr; 702 703 return __do_open(fdopen(__fd, __mdstr), __mode); 704} 705 706# ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR 707// This is basically the same as the char* overload except that it uses _wfopen 708// and long mode strings. 709template <class _CharT, class _Traits> 710basic_filebuf<_CharT, _Traits>* basic_filebuf<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode) { 711 if (__file_) 712 return nullptr; 713 const wchar_t* __mdstr = __make_mdwstring(__mode); 714 if (!__mdstr) 715 return nullptr; 716 717 return __do_open(_wfopen(__s, __mdstr), __mode); 718} 719# endif 720 721template <class _CharT, class _Traits> 722inline basic_filebuf<_CharT, _Traits>* 723basic_filebuf<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode) { 724 return open(__s.c_str(), __mode); 725} 726 727template <class _CharT, class _Traits> 728basic_filebuf<_CharT, _Traits>* basic_filebuf<_CharT, _Traits>::close() { 729 basic_filebuf<_CharT, _Traits>* __rt = nullptr; 730 if (__file_) { 731 __rt = this; 732 unique_ptr<FILE, int (*)(FILE*)> __h(__file_, fclose); 733 if (sync()) 734 __rt = nullptr; 735 if (fclose(__h.release())) 736 __rt = nullptr; 737 __file_ = nullptr; 738 setbuf(0, 0); 739 } 740 return __rt; 741} 742 743template <class _CharT, class _Traits> 744typename basic_filebuf<_CharT, _Traits>::int_type basic_filebuf<_CharT, _Traits>::underflow() { 745 if (__file_ == nullptr) 746 return traits_type::eof(); 747 bool __initial = __read_mode(); 748 char_type __1buf; 749 if (this->gptr() == nullptr) 750 this->setg(&__1buf, &__1buf + 1, &__1buf + 1); 751 const size_t __unget_sz = __initial ? 0 : std::min<size_t>((this->egptr() - this->eback()) / 2, 4); 752 int_type __c = traits_type::eof(); 753 if (this->gptr() == this->egptr()) { 754 std::memmove(this->eback(), this->egptr() - __unget_sz, __unget_sz * sizeof(char_type)); 755 if (__always_noconv_) { 756 size_t __nmemb = static_cast<size_t>(this->egptr() - this->eback() - __unget_sz); 757 __nmemb = ::fread(this->eback() + __unget_sz, 1, __nmemb, __file_); 758 if (__nmemb != 0) { 759 this->setg(this->eback(), this->eback() + __unget_sz, this->eback() + __unget_sz + __nmemb); 760 __c = traits_type::to_int_type(*this->gptr()); 761 } 762 } else { 763 if (__extbufend_ != __extbufnext_) { 764 _LIBCPP_ASSERT_NON_NULL(__extbufnext_ != nullptr, "underflow moving from nullptr"); 765 _LIBCPP_ASSERT_NON_NULL(__extbuf_ != nullptr, "underflow moving into nullptr"); 766 std::memmove(__extbuf_, __extbufnext_, __extbufend_ - __extbufnext_); 767 } 768 __extbufnext_ = __extbuf_ + (__extbufend_ - __extbufnext_); 769 __extbufend_ = __extbuf_ + (__extbuf_ == __extbuf_min_ ? sizeof(__extbuf_min_) : __ebs_); 770 size_t __nmemb = 771 std::min(static_cast<size_t>(__ibs_ - __unget_sz), static_cast<size_t>(__extbufend_ - __extbufnext_)); 772 codecvt_base::result __r; 773 __st_last_ = __st_; 774 size_t __nr = fread((void*)const_cast<char*>(__extbufnext_), 1, __nmemb, __file_); 775 if (__nr != 0) { 776 if (!__cv_) 777 __throw_bad_cast(); 778 779 __extbufend_ = __extbufnext_ + __nr; 780 char_type* __inext; 781 __r = __cv_->in( 782 __st_, __extbuf_, __extbufend_, __extbufnext_, this->eback() + __unget_sz, this->eback() + __ibs_, __inext); 783 if (__r == codecvt_base::noconv) { 784 this->setg((char_type*)__extbuf_, (char_type*)__extbuf_, (char_type*)const_cast<char*>(__extbufend_)); 785 __c = traits_type::to_int_type(*this->gptr()); 786 } else if (__inext != this->eback() + __unget_sz) { 787 this->setg(this->eback(), this->eback() + __unget_sz, __inext); 788 __c = traits_type::to_int_type(*this->gptr()); 789 } 790 } 791 } 792 } else 793 __c = traits_type::to_int_type(*this->gptr()); 794 if (this->eback() == &__1buf) 795 this->setg(nullptr, nullptr, nullptr); 796 return __c; 797} 798 799template <class _CharT, class _Traits> 800typename basic_filebuf<_CharT, _Traits>::int_type basic_filebuf<_CharT, _Traits>::pbackfail(int_type __c) { 801 if (__file_ && this->eback() < this->gptr()) { 802 if (traits_type::eq_int_type(__c, traits_type::eof())) { 803 this->gbump(-1); 804 return traits_type::not_eof(__c); 805 } 806 if ((__om_ & ios_base::out) || traits_type::eq(traits_type::to_char_type(__c), this->gptr()[-1])) { 807 this->gbump(-1); 808 *this->gptr() = traits_type::to_char_type(__c); 809 return __c; 810 } 811 } 812 return traits_type::eof(); 813} 814 815template <class _CharT, class _Traits> 816typename basic_filebuf<_CharT, _Traits>::int_type basic_filebuf<_CharT, _Traits>::overflow(int_type __c) { 817 if (__file_ == nullptr) 818 return traits_type::eof(); 819 __write_mode(); 820 char_type __1buf; 821 char_type* __pb_save = this->pbase(); 822 char_type* __epb_save = this->epptr(); 823 if (!traits_type::eq_int_type(__c, traits_type::eof())) { 824 if (this->pptr() == nullptr) 825 this->setp(&__1buf, &__1buf + 1); 826 *this->pptr() = traits_type::to_char_type(__c); 827 this->pbump(1); 828 } 829 if (this->pptr() != this->pbase()) { 830 if (__always_noconv_) { 831 size_t __nmemb = static_cast<size_t>(this->pptr() - this->pbase()); 832 if (std::fwrite(this->pbase(), sizeof(char_type), __nmemb, __file_) != __nmemb) 833 return traits_type::eof(); 834 } else { 835 char* __extbe = __extbuf_; 836 codecvt_base::result __r; 837 do { 838 if (!__cv_) 839 __throw_bad_cast(); 840 841 const char_type* __e; 842 __r = __cv_->out(__st_, this->pbase(), this->pptr(), __e, __extbuf_, __extbuf_ + __ebs_, __extbe); 843 if (__e == this->pbase()) 844 return traits_type::eof(); 845 if (__r == codecvt_base::noconv) { 846 size_t __nmemb = static_cast<size_t>(this->pptr() - this->pbase()); 847 if (std::fwrite(this->pbase(), 1, __nmemb, __file_) != __nmemb) 848 return traits_type::eof(); 849 } else if (__r == codecvt_base::ok || __r == codecvt_base::partial) { 850 size_t __nmemb = static_cast<size_t>(__extbe - __extbuf_); 851 if (fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb) 852 return traits_type::eof(); 853 if (__r == codecvt_base::partial) { 854 this->setp(const_cast<char_type*>(__e), this->pptr()); 855 this->__pbump(this->epptr() - this->pbase()); 856 } 857 } else 858 return traits_type::eof(); 859 } while (__r == codecvt_base::partial); 860 } 861 this->setp(__pb_save, __epb_save); 862 } 863 return traits_type::not_eof(__c); 864} 865 866template <class _CharT, class _Traits> 867basic_streambuf<_CharT, _Traits>* basic_filebuf<_CharT, _Traits>::setbuf(char_type* __s, streamsize __n) { 868 this->setg(nullptr, nullptr, nullptr); 869 this->setp(nullptr, nullptr); 870 __request_unbuffered_mode(__s, __n); 871 if (__owns_eb_) 872 delete[] __extbuf_; 873 if (__owns_ib_) 874 delete[] __intbuf_; 875 __ebs_ = __n; 876 if (__ebs_ > sizeof(__extbuf_min_)) { 877 if (__always_noconv_ && __s) { 878 __extbuf_ = (char*)__s; 879 __owns_eb_ = false; 880 } else { 881 __extbuf_ = new char[__ebs_]; 882 __owns_eb_ = true; 883 } 884 } else { 885 __extbuf_ = __extbuf_min_; 886 __ebs_ = sizeof(__extbuf_min_); 887 __owns_eb_ = false; 888 } 889 if (!__always_noconv_) { 890 __ibs_ = max<streamsize>(__n, sizeof(__extbuf_min_)); 891 if (__s && __ibs_ > sizeof(__extbuf_min_)) { 892 __intbuf_ = __s; 893 __owns_ib_ = false; 894 } else { 895 __intbuf_ = new char_type[__ibs_]; 896 __owns_ib_ = true; 897 } 898 } else { 899 __ibs_ = 0; 900 __intbuf_ = nullptr; 901 __owns_ib_ = false; 902 } 903 return this; 904} 905 906template <class _CharT, class _Traits> 907typename basic_filebuf<_CharT, _Traits>::pos_type 908basic_filebuf<_CharT, _Traits>::seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode) { 909 if (!__cv_) 910 __throw_bad_cast(); 911 912 int __width = __cv_->encoding(); 913 if (__file_ == nullptr || (__width <= 0 && __off != 0) || sync()) 914 return pos_type(off_type(-1)); 915 // __width > 0 || __off == 0 916 int __whence; 917 switch (__way) { 918 case ios_base::beg: 919 __whence = SEEK_SET; 920 break; 921 case ios_base::cur: 922 __whence = SEEK_CUR; 923 break; 924 case ios_base::end: 925 __whence = SEEK_END; 926 break; 927 default: 928 return pos_type(off_type(-1)); 929 } 930# if defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS) 931 if (fseek(__file_, __width > 0 ? __width * __off : 0, __whence)) 932 return pos_type(off_type(-1)); 933 pos_type __r = ftell(__file_); 934# else 935 if (::fseeko(__file_, __width > 0 ? __width * __off : 0, __whence)) 936 return pos_type(off_type(-1)); 937 pos_type __r = ftello(__file_); 938# endif 939 __r.state(__st_); 940 return __r; 941} 942 943template <class _CharT, class _Traits> 944typename basic_filebuf<_CharT, _Traits>::pos_type 945basic_filebuf<_CharT, _Traits>::seekpos(pos_type __sp, ios_base::openmode) { 946 if (__file_ == nullptr || sync()) 947 return pos_type(off_type(-1)); 948# if defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS) 949 if (fseek(__file_, __sp, SEEK_SET)) 950 return pos_type(off_type(-1)); 951# else 952 if (::fseeko(__file_, __sp, SEEK_SET)) 953 return pos_type(off_type(-1)); 954# endif 955 __st_ = __sp.state(); 956 return __sp; 957} 958 959template <class _CharT, class _Traits> 960int basic_filebuf<_CharT, _Traits>::sync() { 961 if (__file_ == nullptr) 962 return 0; 963 if (!__cv_) 964 __throw_bad_cast(); 965 966 if (__cm_ & ios_base::out) { 967 if (this->pptr() != this->pbase()) 968 if (overflow() == traits_type::eof()) 969 return -1; 970 codecvt_base::result __r; 971 do { 972 char* __extbe; 973 __r = __cv_->unshift(__st_, __extbuf_, __extbuf_ + __ebs_, __extbe); 974 size_t __nmemb = static_cast<size_t>(__extbe - __extbuf_); 975 if (fwrite(__extbuf_, 1, __nmemb, __file_) != __nmemb) 976 return -1; 977 } while (__r == codecvt_base::partial); 978 if (__r == codecvt_base::error) 979 return -1; 980 if (fflush(__file_)) 981 return -1; 982 } else if (__cm_ & ios_base::in) { 983 off_type __c; 984 state_type __state = __st_last_; 985 bool __update_st = false; 986 if (__always_noconv_) 987 __c = this->egptr() - this->gptr(); 988 else { 989 int __width = __cv_->encoding(); 990 __c = __extbufend_ - __extbufnext_; 991 if (__width > 0) 992 __c += __width * (this->egptr() - this->gptr()); 993 else { 994 if (this->gptr() != this->egptr()) { 995 const int __off = __cv_->length(__state, __extbuf_, __extbufnext_, this->gptr() - this->eback()); 996 __c += __extbufnext_ - __extbuf_ - __off; 997 __update_st = true; 998 } 999 } 1000 } 1001# if defined(_LIBCPP_HAS_NO_OFF_T_FUNCTIONS) 1002 if (fseek(__file_, -__c, SEEK_CUR)) 1003 return -1; 1004# else 1005 if (::fseeko(__file_, -__c, SEEK_CUR)) 1006 return -1; 1007# endif 1008 if (__update_st) 1009 __st_ = __state; 1010 __extbufnext_ = __extbufend_ = __extbuf_; 1011 this->setg(nullptr, nullptr, nullptr); 1012 __cm_ = 0; 1013 } 1014 return 0; 1015} 1016 1017template <class _CharT, class _Traits> 1018void basic_filebuf<_CharT, _Traits>::imbue(const locale& __loc) { 1019 sync(); 1020 __cv_ = &std::use_facet<codecvt<char_type, char, state_type> >(__loc); 1021 bool __old_anc = __always_noconv_; 1022 __always_noconv_ = __cv_->always_noconv(); 1023 if (__old_anc != __always_noconv_) { 1024 this->setg(nullptr, nullptr, nullptr); 1025 this->setp(nullptr, nullptr); 1026 // invariant, char_type is char, else we couldn't get here 1027 if (__always_noconv_) // need to dump __intbuf_ 1028 { 1029 if (__owns_eb_) 1030 delete[] __extbuf_; 1031 __owns_eb_ = __owns_ib_; 1032 __ebs_ = __ibs_; 1033 __extbuf_ = (char*)__intbuf_; 1034 __ibs_ = 0; 1035 __intbuf_ = nullptr; 1036 __owns_ib_ = false; 1037 } else // need to obtain an __intbuf_. 1038 { // If __extbuf_ is user-supplied, use it, else new __intbuf_ 1039 if (!__owns_eb_ && __extbuf_ != __extbuf_min_) { 1040 __ibs_ = __ebs_; 1041 __intbuf_ = (char_type*)__extbuf_; 1042 __owns_ib_ = false; 1043 __extbuf_ = new char[__ebs_]; 1044 __owns_eb_ = true; 1045 } else { 1046 __ibs_ = __ebs_; 1047 __intbuf_ = new char_type[__ibs_]; 1048 __owns_ib_ = true; 1049 } 1050 } 1051 } 1052} 1053 1054template <class _CharT, class _Traits> 1055bool basic_filebuf<_CharT, _Traits>::__read_mode() { 1056 if (!(__cm_ & ios_base::in)) { 1057 this->setp(nullptr, nullptr); 1058 if (__always_noconv_) 1059 this->setg((char_type*)__extbuf_, (char_type*)__extbuf_ + __ebs_, (char_type*)__extbuf_ + __ebs_); 1060 else 1061 this->setg(__intbuf_, __intbuf_ + __ibs_, __intbuf_ + __ibs_); 1062 __cm_ = ios_base::in; 1063 return true; 1064 } 1065 return false; 1066} 1067 1068template <class _CharT, class _Traits> 1069void basic_filebuf<_CharT, _Traits>::__write_mode() { 1070 if (!(__cm_ & ios_base::out)) { 1071 this->setg(nullptr, nullptr, nullptr); 1072 if (__ebs_ > sizeof(__extbuf_min_)) { 1073 if (__always_noconv_) 1074 this->setp((char_type*)__extbuf_, (char_type*)__extbuf_ + (__ebs_ - 1)); 1075 else 1076 this->setp(__intbuf_, __intbuf_ + (__ibs_ - 1)); 1077 } else 1078 this->setp(nullptr, nullptr); 1079 __cm_ = ios_base::out; 1080 } 1081} 1082 1083// basic_ifstream 1084 1085template <class _CharT, class _Traits> 1086class _LIBCPP_TEMPLATE_VIS basic_ifstream : public basic_istream<_CharT, _Traits> { 1087public: 1088 typedef _CharT char_type; 1089 typedef _Traits traits_type; 1090 typedef typename traits_type::int_type int_type; 1091 typedef typename traits_type::pos_type pos_type; 1092 typedef typename traits_type::off_type off_type; 1093# if _LIBCPP_STD_VER >= 26 1094 using native_handle_type = typename basic_filebuf<_CharT, _Traits>::native_handle_type; 1095# endif 1096 1097 _LIBCPP_HIDE_FROM_ABI basic_ifstream(); 1098 _LIBCPP_HIDE_FROM_ABI explicit basic_ifstream(const char* __s, ios_base::openmode __mode = ios_base::in); 1099# ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR 1100 _LIBCPP_HIDE_FROM_ABI explicit basic_ifstream(const wchar_t* __s, ios_base::openmode __mode = ios_base::in); 1101# endif 1102 _LIBCPP_HIDE_FROM_ABI explicit basic_ifstream(const string& __s, ios_base::openmode __mode = ios_base::in); 1103# if _LIBCPP_STD_VER >= 17 1104 _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_HIDE_FROM_ABI explicit basic_ifstream( 1105 const filesystem::path& __p, ios_base::openmode __mode = ios_base::in) 1106 : basic_ifstream(__p.c_str(), __mode) {} 1107# endif // _LIBCPP_STD_VER >= 17 1108 _LIBCPP_HIDE_FROM_ABI basic_ifstream(basic_ifstream&& __rhs); 1109 _LIBCPP_HIDE_FROM_ABI basic_ifstream& operator=(basic_ifstream&& __rhs); 1110 _LIBCPP_HIDE_FROM_ABI void swap(basic_ifstream& __rhs); 1111 1112 _LIBCPP_HIDE_FROM_ABI basic_filebuf<char_type, traits_type>* rdbuf() const; 1113# if _LIBCPP_STD_VER >= 26 1114 _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() const noexcept { return rdbuf()->native_handle(); } 1115# endif 1116 _LIBCPP_HIDE_FROM_ABI bool is_open() const; 1117 void open(const char* __s, ios_base::openmode __mode = ios_base::in); 1118# ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR 1119 void open(const wchar_t* __s, ios_base::openmode __mode = ios_base::in); 1120# endif 1121 void open(const string& __s, ios_base::openmode __mode = ios_base::in); 1122# if _LIBCPP_STD_VER >= 17 1123 _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_HIDE_FROM_ABI void 1124 open(const filesystem::path& __p, ios_base::openmode __mode = ios_base::in) { 1125 return open(__p.c_str(), __mode); 1126 } 1127# endif // _LIBCPP_STD_VER >= 17 1128 1129 _LIBCPP_HIDE_FROM_ABI void __open(int __fd, ios_base::openmode __mode); 1130 _LIBCPP_HIDE_FROM_ABI void close(); 1131 1132private: 1133 basic_filebuf<char_type, traits_type> __sb_; 1134}; 1135 1136template <class _CharT, class _Traits> 1137inline basic_ifstream<_CharT, _Traits>::basic_ifstream() : basic_istream<char_type, traits_type>(&__sb_) {} 1138 1139template <class _CharT, class _Traits> 1140inline basic_ifstream<_CharT, _Traits>::basic_ifstream(const char* __s, ios_base::openmode __mode) 1141 : basic_istream<char_type, traits_type>(&__sb_) { 1142 if (__sb_.open(__s, __mode | ios_base::in) == nullptr) 1143 this->setstate(ios_base::failbit); 1144} 1145 1146# ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR 1147template <class _CharT, class _Traits> 1148inline basic_ifstream<_CharT, _Traits>::basic_ifstream(const wchar_t* __s, ios_base::openmode __mode) 1149 : basic_istream<char_type, traits_type>(&__sb_) { 1150 if (__sb_.open(__s, __mode | ios_base::in) == nullptr) 1151 this->setstate(ios_base::failbit); 1152} 1153# endif 1154 1155template <class _CharT, class _Traits> 1156inline basic_ifstream<_CharT, _Traits>::basic_ifstream(const string& __s, ios_base::openmode __mode) 1157 : basic_istream<char_type, traits_type>(&__sb_) { 1158 if (__sb_.open(__s, __mode | ios_base::in) == nullptr) 1159 this->setstate(ios_base::failbit); 1160} 1161 1162template <class _CharT, class _Traits> 1163inline basic_ifstream<_CharT, _Traits>::basic_ifstream(basic_ifstream&& __rhs) 1164 : basic_istream<char_type, traits_type>(std::move(__rhs)), __sb_(std::move(__rhs.__sb_)) { 1165 this->set_rdbuf(&__sb_); 1166} 1167 1168template <class _CharT, class _Traits> 1169inline basic_ifstream<_CharT, _Traits>& basic_ifstream<_CharT, _Traits>::operator=(basic_ifstream&& __rhs) { 1170 basic_istream<char_type, traits_type>::operator=(std::move(__rhs)); 1171 __sb_ = std::move(__rhs.__sb_); 1172 return *this; 1173} 1174 1175template <class _CharT, class _Traits> 1176inline void basic_ifstream<_CharT, _Traits>::swap(basic_ifstream& __rhs) { 1177 basic_istream<char_type, traits_type>::swap(__rhs); 1178 __sb_.swap(__rhs.__sb_); 1179} 1180 1181template <class _CharT, class _Traits> 1182inline _LIBCPP_HIDE_FROM_ABI void swap(basic_ifstream<_CharT, _Traits>& __x, basic_ifstream<_CharT, _Traits>& __y) { 1183 __x.swap(__y); 1184} 1185 1186template <class _CharT, class _Traits> 1187inline basic_filebuf<_CharT, _Traits>* basic_ifstream<_CharT, _Traits>::rdbuf() const { 1188 return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_); 1189} 1190 1191template <class _CharT, class _Traits> 1192inline bool basic_ifstream<_CharT, _Traits>::is_open() const { 1193 return __sb_.is_open(); 1194} 1195 1196template <class _CharT, class _Traits> 1197void basic_ifstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode) { 1198 if (__sb_.open(__s, __mode | ios_base::in)) 1199 this->clear(); 1200 else 1201 this->setstate(ios_base::failbit); 1202} 1203 1204# ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR 1205template <class _CharT, class _Traits> 1206void basic_ifstream<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode) { 1207 if (__sb_.open(__s, __mode | ios_base::in)) 1208 this->clear(); 1209 else 1210 this->setstate(ios_base::failbit); 1211} 1212# endif 1213 1214template <class _CharT, class _Traits> 1215void basic_ifstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode) { 1216 if (__sb_.open(__s, __mode | ios_base::in)) 1217 this->clear(); 1218 else 1219 this->setstate(ios_base::failbit); 1220} 1221 1222template <class _CharT, class _Traits> 1223inline void basic_ifstream<_CharT, _Traits>::__open(int __fd, ios_base::openmode __mode) { 1224 if (__sb_.__open(__fd, __mode | ios_base::in)) 1225 this->clear(); 1226 else 1227 this->setstate(ios_base::failbit); 1228} 1229 1230template <class _CharT, class _Traits> 1231inline void basic_ifstream<_CharT, _Traits>::close() { 1232 if (__sb_.close() == 0) 1233 this->setstate(ios_base::failbit); 1234} 1235 1236// basic_ofstream 1237 1238template <class _CharT, class _Traits> 1239class _LIBCPP_TEMPLATE_VIS basic_ofstream : public basic_ostream<_CharT, _Traits> { 1240public: 1241 typedef _CharT char_type; 1242 typedef _Traits traits_type; 1243 typedef typename traits_type::int_type int_type; 1244 typedef typename traits_type::pos_type pos_type; 1245 typedef typename traits_type::off_type off_type; 1246# if _LIBCPP_STD_VER >= 26 1247 using native_handle_type = typename basic_filebuf<_CharT, _Traits>::native_handle_type; 1248# endif 1249 1250 _LIBCPP_HIDE_FROM_ABI basic_ofstream(); 1251 _LIBCPP_HIDE_FROM_ABI explicit basic_ofstream(const char* __s, ios_base::openmode __mode = ios_base::out); 1252# ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR 1253 _LIBCPP_HIDE_FROM_ABI explicit basic_ofstream(const wchar_t* __s, ios_base::openmode __mode = ios_base::out); 1254# endif 1255 _LIBCPP_HIDE_FROM_ABI explicit basic_ofstream(const string& __s, ios_base::openmode __mode = ios_base::out); 1256 1257# if _LIBCPP_STD_VER >= 17 1258 _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_HIDE_FROM_ABI explicit basic_ofstream( 1259 const filesystem::path& __p, ios_base::openmode __mode = ios_base::out) 1260 : basic_ofstream(__p.c_str(), __mode) {} 1261# endif // _LIBCPP_STD_VER >= 17 1262 1263 _LIBCPP_HIDE_FROM_ABI basic_ofstream(basic_ofstream&& __rhs); 1264 _LIBCPP_HIDE_FROM_ABI basic_ofstream& operator=(basic_ofstream&& __rhs); 1265 _LIBCPP_HIDE_FROM_ABI void swap(basic_ofstream& __rhs); 1266 1267 _LIBCPP_HIDE_FROM_ABI basic_filebuf<char_type, traits_type>* rdbuf() const; 1268# if _LIBCPP_STD_VER >= 26 1269 _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() const noexcept { return rdbuf()->native_handle(); } 1270# endif 1271 _LIBCPP_HIDE_FROM_ABI bool is_open() const; 1272 void open(const char* __s, ios_base::openmode __mode = ios_base::out); 1273# ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR 1274 void open(const wchar_t* __s, ios_base::openmode __mode = ios_base::out); 1275# endif 1276 void open(const string& __s, ios_base::openmode __mode = ios_base::out); 1277 1278# if _LIBCPP_STD_VER >= 17 1279 _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_HIDE_FROM_ABI void 1280 open(const filesystem::path& __p, ios_base::openmode __mode = ios_base::out) { 1281 return open(__p.c_str(), __mode); 1282 } 1283# endif // _LIBCPP_STD_VER >= 17 1284 1285 _LIBCPP_HIDE_FROM_ABI void __open(int __fd, ios_base::openmode __mode); 1286 _LIBCPP_HIDE_FROM_ABI void close(); 1287 1288private: 1289 basic_filebuf<char_type, traits_type> __sb_; 1290}; 1291 1292template <class _CharT, class _Traits> 1293inline basic_ofstream<_CharT, _Traits>::basic_ofstream() : basic_ostream<char_type, traits_type>(&__sb_) {} 1294 1295template <class _CharT, class _Traits> 1296inline basic_ofstream<_CharT, _Traits>::basic_ofstream(const char* __s, ios_base::openmode __mode) 1297 : basic_ostream<char_type, traits_type>(&__sb_) { 1298 if (__sb_.open(__s, __mode | ios_base::out) == nullptr) 1299 this->setstate(ios_base::failbit); 1300} 1301 1302# ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR 1303template <class _CharT, class _Traits> 1304inline basic_ofstream<_CharT, _Traits>::basic_ofstream(const wchar_t* __s, ios_base::openmode __mode) 1305 : basic_ostream<char_type, traits_type>(&__sb_) { 1306 if (__sb_.open(__s, __mode | ios_base::out) == nullptr) 1307 this->setstate(ios_base::failbit); 1308} 1309# endif 1310 1311template <class _CharT, class _Traits> 1312inline basic_ofstream<_CharT, _Traits>::basic_ofstream(const string& __s, ios_base::openmode __mode) 1313 : basic_ostream<char_type, traits_type>(&__sb_) { 1314 if (__sb_.open(__s, __mode | ios_base::out) == nullptr) 1315 this->setstate(ios_base::failbit); 1316} 1317 1318template <class _CharT, class _Traits> 1319inline basic_ofstream<_CharT, _Traits>::basic_ofstream(basic_ofstream&& __rhs) 1320 : basic_ostream<char_type, traits_type>(std::move(__rhs)), __sb_(std::move(__rhs.__sb_)) { 1321 this->set_rdbuf(&__sb_); 1322} 1323 1324template <class _CharT, class _Traits> 1325inline basic_ofstream<_CharT, _Traits>& basic_ofstream<_CharT, _Traits>::operator=(basic_ofstream&& __rhs) { 1326 basic_ostream<char_type, traits_type>::operator=(std::move(__rhs)); 1327 __sb_ = std::move(__rhs.__sb_); 1328 return *this; 1329} 1330 1331template <class _CharT, class _Traits> 1332inline void basic_ofstream<_CharT, _Traits>::swap(basic_ofstream& __rhs) { 1333 basic_ostream<char_type, traits_type>::swap(__rhs); 1334 __sb_.swap(__rhs.__sb_); 1335} 1336 1337template <class _CharT, class _Traits> 1338inline _LIBCPP_HIDE_FROM_ABI void swap(basic_ofstream<_CharT, _Traits>& __x, basic_ofstream<_CharT, _Traits>& __y) { 1339 __x.swap(__y); 1340} 1341 1342template <class _CharT, class _Traits> 1343inline basic_filebuf<_CharT, _Traits>* basic_ofstream<_CharT, _Traits>::rdbuf() const { 1344 return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_); 1345} 1346 1347template <class _CharT, class _Traits> 1348inline bool basic_ofstream<_CharT, _Traits>::is_open() const { 1349 return __sb_.is_open(); 1350} 1351 1352template <class _CharT, class _Traits> 1353void basic_ofstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode) { 1354 if (__sb_.open(__s, __mode | ios_base::out)) 1355 this->clear(); 1356 else 1357 this->setstate(ios_base::failbit); 1358} 1359 1360# ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR 1361template <class _CharT, class _Traits> 1362void basic_ofstream<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode) { 1363 if (__sb_.open(__s, __mode | ios_base::out)) 1364 this->clear(); 1365 else 1366 this->setstate(ios_base::failbit); 1367} 1368# endif 1369 1370template <class _CharT, class _Traits> 1371void basic_ofstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode) { 1372 if (__sb_.open(__s, __mode | ios_base::out)) 1373 this->clear(); 1374 else 1375 this->setstate(ios_base::failbit); 1376} 1377 1378template <class _CharT, class _Traits> 1379inline void basic_ofstream<_CharT, _Traits>::__open(int __fd, ios_base::openmode __mode) { 1380 if (__sb_.__open(__fd, __mode | ios_base::out)) 1381 this->clear(); 1382 else 1383 this->setstate(ios_base::failbit); 1384} 1385 1386template <class _CharT, class _Traits> 1387inline void basic_ofstream<_CharT, _Traits>::close() { 1388 if (__sb_.close() == nullptr) 1389 this->setstate(ios_base::failbit); 1390} 1391 1392// basic_fstream 1393 1394template <class _CharT, class _Traits> 1395class _LIBCPP_TEMPLATE_VIS basic_fstream : public basic_iostream<_CharT, _Traits> { 1396public: 1397 typedef _CharT char_type; 1398 typedef _Traits traits_type; 1399 typedef typename traits_type::int_type int_type; 1400 typedef typename traits_type::pos_type pos_type; 1401 typedef typename traits_type::off_type off_type; 1402# if _LIBCPP_STD_VER >= 26 1403 using native_handle_type = typename basic_filebuf<_CharT, _Traits>::native_handle_type; 1404# endif 1405 1406 _LIBCPP_HIDE_FROM_ABI basic_fstream(); 1407 _LIBCPP_HIDE_FROM_ABI explicit basic_fstream(const char* __s, 1408 ios_base::openmode __mode = ios_base::in | ios_base::out); 1409# ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR 1410 _LIBCPP_HIDE_FROM_ABI explicit basic_fstream(const wchar_t* __s, 1411 ios_base::openmode __mode = ios_base::in | ios_base::out); 1412# endif 1413 _LIBCPP_HIDE_FROM_ABI explicit basic_fstream(const string& __s, 1414 ios_base::openmode __mode = ios_base::in | ios_base::out); 1415 1416# if _LIBCPP_STD_VER >= 17 1417 _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_HIDE_FROM_ABI explicit basic_fstream( 1418 const filesystem::path& __p, ios_base::openmode __mode = ios_base::in | ios_base::out) 1419 : basic_fstream(__p.c_str(), __mode) {} 1420# endif // _LIBCPP_STD_VER >= 17 1421 1422 _LIBCPP_HIDE_FROM_ABI basic_fstream(basic_fstream&& __rhs); 1423 1424 _LIBCPP_HIDE_FROM_ABI basic_fstream& operator=(basic_fstream&& __rhs); 1425 1426 _LIBCPP_HIDE_FROM_ABI void swap(basic_fstream& __rhs); 1427 1428 _LIBCPP_HIDE_FROM_ABI basic_filebuf<char_type, traits_type>* rdbuf() const; 1429# if _LIBCPP_STD_VER >= 26 1430 _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() const noexcept { return rdbuf()->native_handle(); } 1431# endif 1432 _LIBCPP_HIDE_FROM_ABI bool is_open() const; 1433 _LIBCPP_HIDE_FROM_ABI void open(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out); 1434# ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR 1435 void open(const wchar_t* __s, ios_base::openmode __mode = ios_base::in | ios_base::out); 1436# endif 1437 _LIBCPP_HIDE_FROM_ABI void open(const string& __s, ios_base::openmode __mode = ios_base::in | ios_base::out); 1438 1439# if _LIBCPP_STD_VER >= 17 1440 _LIBCPP_AVAILABILITY_FILESYSTEM_LIBRARY _LIBCPP_HIDE_FROM_ABI void 1441 open(const filesystem::path& __p, ios_base::openmode __mode = ios_base::in | ios_base::out) { 1442 return open(__p.c_str(), __mode); 1443 } 1444# endif // _LIBCPP_STD_VER >= 17 1445 1446 _LIBCPP_HIDE_FROM_ABI void close(); 1447 1448private: 1449 basic_filebuf<char_type, traits_type> __sb_; 1450}; 1451 1452template <class _CharT, class _Traits> 1453inline basic_fstream<_CharT, _Traits>::basic_fstream() : basic_iostream<char_type, traits_type>(&__sb_) {} 1454 1455template <class _CharT, class _Traits> 1456inline basic_fstream<_CharT, _Traits>::basic_fstream(const char* __s, ios_base::openmode __mode) 1457 : basic_iostream<char_type, traits_type>(&__sb_) { 1458 if (__sb_.open(__s, __mode) == nullptr) 1459 this->setstate(ios_base::failbit); 1460} 1461 1462# ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR 1463template <class _CharT, class _Traits> 1464inline basic_fstream<_CharT, _Traits>::basic_fstream(const wchar_t* __s, ios_base::openmode __mode) 1465 : basic_iostream<char_type, traits_type>(&__sb_) { 1466 if (__sb_.open(__s, __mode) == nullptr) 1467 this->setstate(ios_base::failbit); 1468} 1469# endif 1470 1471template <class _CharT, class _Traits> 1472inline basic_fstream<_CharT, _Traits>::basic_fstream(const string& __s, ios_base::openmode __mode) 1473 : basic_iostream<char_type, traits_type>(&__sb_) { 1474 if (__sb_.open(__s, __mode) == nullptr) 1475 this->setstate(ios_base::failbit); 1476} 1477 1478template <class _CharT, class _Traits> 1479inline basic_fstream<_CharT, _Traits>::basic_fstream(basic_fstream&& __rhs) 1480 : basic_iostream<char_type, traits_type>(std::move(__rhs)), __sb_(std::move(__rhs.__sb_)) { 1481 this->set_rdbuf(&__sb_); 1482} 1483 1484template <class _CharT, class _Traits> 1485inline basic_fstream<_CharT, _Traits>& basic_fstream<_CharT, _Traits>::operator=(basic_fstream&& __rhs) { 1486 basic_iostream<char_type, traits_type>::operator=(std::move(__rhs)); 1487 __sb_ = std::move(__rhs.__sb_); 1488 return *this; 1489} 1490 1491template <class _CharT, class _Traits> 1492inline void basic_fstream<_CharT, _Traits>::swap(basic_fstream& __rhs) { 1493 basic_iostream<char_type, traits_type>::swap(__rhs); 1494 __sb_.swap(__rhs.__sb_); 1495} 1496 1497template <class _CharT, class _Traits> 1498inline _LIBCPP_HIDE_FROM_ABI void swap(basic_fstream<_CharT, _Traits>& __x, basic_fstream<_CharT, _Traits>& __y) { 1499 __x.swap(__y); 1500} 1501 1502template <class _CharT, class _Traits> 1503inline basic_filebuf<_CharT, _Traits>* basic_fstream<_CharT, _Traits>::rdbuf() const { 1504 return const_cast<basic_filebuf<char_type, traits_type>*>(&__sb_); 1505} 1506 1507template <class _CharT, class _Traits> 1508inline bool basic_fstream<_CharT, _Traits>::is_open() const { 1509 return __sb_.is_open(); 1510} 1511 1512template <class _CharT, class _Traits> 1513void basic_fstream<_CharT, _Traits>::open(const char* __s, ios_base::openmode __mode) { 1514 if (__sb_.open(__s, __mode)) 1515 this->clear(); 1516 else 1517 this->setstate(ios_base::failbit); 1518} 1519 1520# ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR 1521template <class _CharT, class _Traits> 1522void basic_fstream<_CharT, _Traits>::open(const wchar_t* __s, ios_base::openmode __mode) { 1523 if (__sb_.open(__s, __mode)) 1524 this->clear(); 1525 else 1526 this->setstate(ios_base::failbit); 1527} 1528# endif 1529 1530template <class _CharT, class _Traits> 1531void basic_fstream<_CharT, _Traits>::open(const string& __s, ios_base::openmode __mode) { 1532 if (__sb_.open(__s, __mode)) 1533 this->clear(); 1534 else 1535 this->setstate(ios_base::failbit); 1536} 1537 1538template <class _CharT, class _Traits> 1539inline void basic_fstream<_CharT, _Traits>::close() { 1540 if (__sb_.close() == nullptr) 1541 this->setstate(ios_base::failbit); 1542} 1543 1544# if _LIBCPP_AVAILABILITY_HAS_ADDITIONAL_IOSTREAM_EXPLICIT_INSTANTIATIONS_1 1545extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ifstream<char>; 1546extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_ofstream<char>; 1547extern template class _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS basic_filebuf<char>; 1548# endif 1549 1550_LIBCPP_END_NAMESPACE_STD 1551 1552#endif // _LIBCPP_HAS_NO_FILESYSTEM 1553 1554_LIBCPP_POP_MACROS 1555 1556#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20 1557# include <atomic> 1558# include <concepts> 1559# include <cstdlib> 1560# include <iosfwd> 1561# include <limits> 1562# include <mutex> 1563# include <new> 1564# include <stdexcept> 1565# include <type_traits> 1566#endif 1567 1568#endif // _LIBCPP_FSTREAM 1569