Where Online Learning is simpler!
The C and C++ Include Header Files
/usr/include/c++/11/bits/istream.tcc
$ cat -n /usr/include/c++/11/bits/istream.tcc 1 // istream classes -*- C++ -*- 2 3 // Copyright (C) 1997-2021 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 /** @file bits/istream.tcc 26 * This is an internal header file, included by other library headers. 27 * Do not attempt to use it directly. @headername{istream} 28 */ 29 30 // 31 // ISO C++ 14882: 27.6.1 Input streams 32 // 33 34 #ifndef _ISTREAM_TCC 35 #define _ISTREAM_TCC 1 36 37 #pragma GCC system_header 38 39 #include <bits/cxxabi_forced.h> 40 41 namespace std _GLIBCXX_VISIBILITY(default) 42 { 43 _GLIBCXX_BEGIN_NAMESPACE_VERSION 44 45 template<typename _CharT, typename _Traits> 46 basic_istream<_CharT, _Traits>::sentry:: 47 sentry(basic_istream<_CharT, _Traits>& __in, bool __noskip) : _M_ok(false) 48 { 49 ios_base::iostate __err = ios_base::goodbit; 50 if (__in.good()) 51 __try 52 { 53 if (__in.tie()) 54 __in.tie()->flush(); 55 if (!__noskip && bool(__in.flags() & ios_base::skipws)) 56 { 57 const __int_type __eof = traits_type::eof(); 58 __streambuf_type* __sb = __in.rdbuf(); 59 __int_type __c = __sb->sgetc(); 60 61 const __ctype_type& __ct = __check_facet(__in._M_ctype); 62 while (!traits_type::eq_int_type(__c, __eof) 63 && __ct.is(ctype_base::space, 64 traits_type::to_char_type(__c))) 65 __c = __sb->snextc(); 66 67 // _GLIBCXX_RESOLVE_LIB_DEFECTS 68 // 195. Should basic_istream::sentry's constructor ever 69 // set eofbit? 70 if (traits_type::eq_int_type(__c, __eof)) 71 __err |= ios_base::eofbit; 72 } 73 } 74 __catch(__cxxabiv1::__forced_unwind&) 75 { 76 __in._M_setstate(ios_base::badbit); 77 __throw_exception_again; 78 } 79 __catch(...) 80 { __in._M_setstate(ios_base::badbit); } 81 82 if (__in.good() && __err == ios_base::goodbit) 83 _M_ok = true; 84 else 85 { 86 __err |= ios_base::failbit; 87 __in.setstate(__err); 88 } 89 } 90 91 template<typename _CharT, typename _Traits> 92 template<typename _ValueT> 93 basic_istream<_CharT, _Traits>& 94 basic_istream<_CharT, _Traits>:: 95 _M_extract(_ValueT& __v) 96 { 97 sentry __cerb(*this, false); 98 if (__cerb) 99 { 100 ios_base::iostate __err = ios_base::goodbit; 101 __try 102 { 103 const __num_get_type& __ng = __check_facet(this->_M_num_get); 104 __ng.get(*this, 0, *this, __err, __v); 105 } 106 __catch(__cxxabiv1::__forced_unwind&) 107 { 108 this->_M_setstate(ios_base::badbit); 109 __throw_exception_again; 110 } 111 __catch(...) 112 { this->_M_setstate(ios_base::badbit); } 113 if (__err) 114 this->setstate(__err); 115 } 116 return *this; 117 } 118 119 template<typename _CharT, typename _Traits> 120 basic_istream<_CharT, _Traits>& 121 basic_istream<_CharT, _Traits>:: 122 operator>>(short& __n) 123 { 124 // _GLIBCXX_RESOLVE_LIB_DEFECTS 125 // 118. basic_istream uses nonexistent num_get member functions. 126 sentry __cerb(*this, false); 127 if (__cerb) 128 { 129 ios_base::iostate __err = ios_base::goodbit; 130 __try 131 { 132 long __l; 133 const __num_get_type& __ng = __check_facet(this->_M_num_get); 134 __ng.get(*this, 0, *this, __err, __l); 135 136 // _GLIBCXX_RESOLVE_LIB_DEFECTS 137 // 696. istream::operator>>(int&) broken. 138 if (__l < __gnu_cxx::__numeric_traits<short>::__min) 139 { 140 __err |= ios_base::failbit; 141 __n = __gnu_cxx::__numeric_traits<short>::__min; 142 } 143 else if (__l > __gnu_cxx::__numeric_traits<short>::__max) 144 { 145 __err |= ios_base::failbit; 146 __n = __gnu_cxx::__numeric_traits<short>::__max; 147 } 148 else 149 __n = short(__l); 150 } 151 __catch(__cxxabiv1::__forced_unwind&) 152 { 153 this->_M_setstate(ios_base::badbit); 154 __throw_exception_again; 155 } 156 __catch(...) 157 { this->_M_setstate(ios_base::badbit); } 158 if (__err) 159 this->setstate(__err); 160 } 161 return *this; 162 } 163 164 template<typename _CharT, typename _Traits> 165 basic_istream<_CharT, _Traits>& 166 basic_istream<_CharT, _Traits>:: 167 operator>>(int& __n) 168 { 169 // _GLIBCXX_RESOLVE_LIB_DEFECTS 170 // 118. basic_istream uses nonexistent num_get member functions. 171 sentry __cerb(*this, false); 172 if (__cerb) 173 { 174 ios_base::iostate __err = ios_base::goodbit; 175 __try 176 { 177 long __l; 178 const __num_get_type& __ng = __check_facet(this->_M_num_get); 179 __ng.get(*this, 0, *this, __err, __l); 180 181 // _GLIBCXX_RESOLVE_LIB_DEFECTS 182 // 696. istream::operator>>(int&) broken. 183 if (__l < __gnu_cxx::__numeric_traits<int>::__min) 184 { 185 __err |= ios_base::failbit; 186 __n = __gnu_cxx::__numeric_traits<int>::__min; 187 } 188 else if (__l > __gnu_cxx::__numeric_traits<int>::__max) 189 { 190 __err |= ios_base::failbit; 191 __n = __gnu_cxx::__numeric_traits<int>::__max; 192 } 193 else 194 __n = int(__l); 195 } 196 __catch(__cxxabiv1::__forced_unwind&) 197 { 198 this->_M_setstate(ios_base::badbit); 199 __throw_exception_again; 200 } 201 __catch(...) 202 { this->_M_setstate(ios_base::badbit); } 203 if (__err) 204 this->setstate(__err); 205 } 206 return *this; 207 } 208 209 template<typename _CharT, typename _Traits> 210 basic_istream<_CharT, _Traits>& 211 basic_istream<_CharT, _Traits>:: 212 operator>>(__streambuf_type* __sbout) 213 { 214 ios_base::iostate __err = ios_base::goodbit; 215 sentry __cerb(*this, false); 216 if (__cerb && __sbout) 217 { 218 __try 219 { 220 bool __ineof; 221 if (!__copy_streambufs_eof(this->rdbuf(), __sbout, __ineof)) 222 __err |= ios_base::failbit; 223 if (__ineof) 224 __err |= ios_base::eofbit; 225 } 226 __catch(__cxxabiv1::__forced_unwind&) 227 { 228 this->_M_setstate(ios_base::failbit); 229 __throw_exception_again; 230 } 231 __catch(...) 232 { this->_M_setstate(ios_base::failbit); } 233 } 234 else if (!__sbout) 235 __err |= ios_base::failbit; 236 if (__err) 237 this->setstate(__err); 238 return *this; 239 } 240 241 template<typename _CharT, typename _Traits> 242 typename basic_istream<_CharT, _Traits>::int_type 243 basic_istream<_CharT, _Traits>:: 244 get(void) 245 { 246 const int_type __eof = traits_type::eof(); 247 int_type __c = __eof; 248 _M_gcount = 0; 249 ios_base::iostate __err = ios_base::goodbit; 250 sentry __cerb(*this, true); 251 if (__cerb) 252 { 253 __try 254 { 255 __c = this->rdbuf()->sbumpc(); 256 // 27.6.1.1 paragraph 3 257 if (!traits_type::eq_int_type(__c, __eof)) 258 _M_gcount = 1; 259 else 260 __err |= ios_base::eofbit; 261 } 262 __catch(__cxxabiv1::__forced_unwind&) 263 { 264 this->_M_setstate(ios_base::badbit); 265 __throw_exception_again; 266 } 267 __catch(...) 268 { this->_M_setstate(ios_base::badbit); } 269 } 270 if (!_M_gcount) 271 __err |= ios_base::failbit; 272 if (__err) 273 this->setstate(__err); 274 return __c; 275 } 276 277 template<typename _CharT, typename _Traits> 278 basic_istream<_CharT, _Traits>& 279 basic_istream<_CharT, _Traits>:: 280 get(char_type& __c) 281 { 282 _M_gcount = 0; 283 ios_base::iostate __err = ios_base::goodbit; 284 sentry __cerb(*this, true); 285 if (__cerb) 286 { 287 __try 288 { 289 const int_type __cb = this->rdbuf()->sbumpc(); 290 // 27.6.1.1 paragraph 3 291 if (!traits_type::eq_int_type(__cb, traits_type::eof())) 292 { 293 _M_gcount = 1; 294 __c = traits_type::to_char_type(__cb); 295 } 296 else 297 __err |= ios_base::eofbit; 298 } 299 __catch(__cxxabiv1::__forced_unwind&) 300 { 301 this->_M_setstate(ios_base::badbit); 302 __throw_exception_again; 303 } 304 __catch(...) 305 { this->_M_setstate(ios_base::badbit); } 306 } 307 if (!_M_gcount) 308 __err |= ios_base::failbit; 309 if (__err) 310 this->setstate(__err); 311 return *this; 312 } 313 314 template<typename _CharT, typename _Traits> 315 basic_istream<_CharT, _Traits>& 316 basic_istream<_CharT, _Traits>:: 317 get(char_type* __s, streamsize __n, char_type __delim) 318 { 319 _M_gcount = 0; 320 ios_base::iostate __err = ios_base::goodbit; 321 sentry __cerb(*this, true); 322 if (__cerb) 323 { 324 __try 325 { 326 const int_type __idelim = traits_type::to_int_type(__delim); 327 const int_type __eof = traits_type::eof(); 328 __streambuf_type* __sb = this->rdbuf(); 329 int_type __c = __sb->sgetc(); 330 331 while (_M_gcount + 1 < __n 332 && !traits_type::eq_int_type(__c, __eof) 333 && !traits_type::eq_int_type(__c, __idelim)) 334 { 335 *__s++ = traits_type::to_char_type(__c); 336 ++_M_gcount; 337 __c = __sb->snextc(); 338 } 339 if (traits_type::eq_int_type(__c, __eof)) 340 __err |= ios_base::eofbit; 341 } 342 __catch(__cxxabiv1::__forced_unwind&) 343 { 344 this->_M_setstate(ios_base::badbit); 345 __throw_exception_again; 346 } 347 __catch(...) 348 { this->_M_setstate(ios_base::badbit); } 349 } 350 // _GLIBCXX_RESOLVE_LIB_DEFECTS 351 // 243. get and getline when sentry reports failure. 352 if (__n > 0) 353 *__s = char_type(); 354 if (!_M_gcount) 355 __err |= ios_base::failbit; 356 if (__err) 357 this->setstate(__err); 358 return *this; 359 } 360 361 template<typename _CharT, typename _Traits> 362 basic_istream<_CharT, _Traits>& 363 basic_istream<_CharT, _Traits>:: 364 get(__streambuf_type& __sb, char_type __delim) 365 { 366 _M_gcount = 0; 367 ios_base::iostate __err = ios_base::goodbit; 368 sentry __cerb(*this, true); 369 if (__cerb) 370 { 371 __try 372 { 373 const int_type __idelim = traits_type::to_int_type(__delim); 374 const int_type __eof = traits_type::eof(); 375 __streambuf_type* __this_sb = this->rdbuf(); 376 int_type __c = __this_sb->sgetc(); 377 char_type __c2 = traits_type::to_char_type(__c); 378 unsigned long long __gcount = 0; 379 380 while (!traits_type::eq_int_type(__c, __eof) 381 && !traits_type::eq_int_type(__c, __idelim) 382 && !traits_type::eq_int_type(__sb.sputc(__c2), __eof)) 383 { 384 ++__gcount; 385 __c = __this_sb->snextc(); 386 __c2 = traits_type::to_char_type(__c); 387 } 388 if (traits_type::eq_int_type(__c, __eof)) 389 __err |= ios_base::eofbit; 390 // _GLIBCXX_RESOLVE_LIB_DEFECTS 391 // 3464. istream::gcount() can overflow 392 if (__gcount <= __gnu_cxx::__numeric_traits<streamsize>::__max) 393 _M_gcount = __gcount; 394 else 395 _M_gcount = __gnu_cxx::__numeric_traits<streamsize>::__max; 396 } 397 __catch(__cxxabiv1::__forced_unwind&) 398 { 399 this->_M_setstate(ios_base::badbit); 400 __throw_exception_again; 401 } 402 __catch(...) 403 { this->_M_setstate(ios_base::badbit); } 404 } 405 if (!_M_gcount) 406 __err |= ios_base::failbit; 407 if (__err) 408 this->setstate(__err); 409 return *this; 410 } 411 412 template<typename _CharT, typename _Traits> 413 basic_istream<_CharT, _Traits>& 414 basic_istream<_CharT, _Traits>:: 415 getline(char_type* __s, streamsize __n, char_type __delim) 416 { 417 _M_gcount = 0; 418 ios_base::iostate __err = ios_base::goodbit; 419 sentry __cerb(*this, true); 420 if (__cerb) 421 { 422 __try 423 { 424 const int_type __idelim = traits_type::to_int_type(__delim); 425 const int_type __eof = traits_type::eof(); 426 __streambuf_type* __sb = this->rdbuf(); 427 int_type __c = __sb->sgetc(); 428 429 while (_M_gcount + 1 < __n 430 && !traits_type::eq_int_type(__c, __eof) 431 && !traits_type::eq_int_type(__c, __idelim)) 432 { 433 *__s++ = traits_type::to_char_type(__c); 434 __c = __sb->snextc(); 435 ++_M_gcount; 436 } 437 if (traits_type::eq_int_type(__c, __eof)) 438 __err |= ios_base::eofbit; 439 else 440 { 441 if (traits_type::eq_int_type(__c, __idelim)) 442 { 443 __sb->sbumpc(); 444 ++_M_gcount; 445 } 446 else 447 __err |= ios_base::failbit; 448 } 449 } 450 __catch(__cxxabiv1::__forced_unwind&) 451 { 452 this->_M_setstate(ios_base::badbit); 453 __throw_exception_again; 454 } 455 __catch(...) 456 { this->_M_setstate(ios_base::badbit); } 457 } 458 // _GLIBCXX_RESOLVE_LIB_DEFECTS 459 // 243. get and getline when sentry reports failure. 460 if (__n > 0) 461 *__s = char_type(); 462 if (!_M_gcount) 463 __err |= ios_base::failbit; 464 if (__err) 465 this->setstate(__err); 466 return *this; 467 } 468 469 // We provide three overloads, since the first two are much simpler 470 // than the general case. Also, the latter two can thus adopt the 471 // same "batchy" strategy used by getline above. 472 template<typename _CharT, typename _Traits> 473 basic_istream<_CharT, _Traits>& 474 basic_istream<_CharT, _Traits>:: 475 ignore(void) 476 { 477 _M_gcount = 0; 478 sentry __cerb(*this, true); 479 if (__cerb) 480 { 481 ios_base::iostate __err = ios_base::goodbit; 482 __try 483 { 484 const int_type __eof = traits_type::eof(); 485 __streambuf_type* __sb = this->rdbuf(); 486 487 if (traits_type::eq_int_type(__sb->sbumpc(), __eof)) 488 __err |= ios_base::eofbit; 489 else 490 _M_gcount = 1; 491 } 492 __catch(__cxxabiv1::__forced_unwind&) 493 { 494 this->_M_setstate(ios_base::badbit); 495 __throw_exception_again; 496 } 497 __catch(...) 498 { this->_M_setstate(ios_base::badbit); } 499 if (__err) 500 this->setstate(__err); 501 } 502 return *this; 503 } 504 505 template<typename _CharT, typename _Traits> 506 basic_istream<_CharT, _Traits>& 507 basic_istream<_CharT, _Traits>:: 508 ignore(streamsize __n) 509 { 510 _M_gcount = 0; 511 sentry __cerb(*this, true); 512 if (__cerb && __n > 0) 513 { 514 ios_base::iostate __err = ios_base::goodbit; 515 __try 516 { 517 const int_type __eof = traits_type::eof(); 518 __streambuf_type* __sb = this->rdbuf(); 519 int_type __c = __sb->sgetc(); 520 521 // N.B. On LFS-enabled platforms streamsize is still 32 bits 522 // wide: if we want to implement the standard mandated behavior 523 // for n == max() (see 27.6.1.3/24) we are at risk of signed 524 // integer overflow: thus these contortions. Also note that, 525 // by definition, when more than 2G chars are actually ignored, 526 // _M_gcount (the return value of gcount, that is) cannot be 527 // really correct, being unavoidably too small. 528 bool __large_ignore = false; 529 while (true) 530 { 531 while (_M_gcount < __n 532 && !traits_type::eq_int_type(__c, __eof)) 533 { 534 ++_M_gcount; 535 __c = __sb->snextc(); 536 } 537 if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max 538 && !traits_type::eq_int_type(__c, __eof)) 539 { 540 _M_gcount = 541 __gnu_cxx::__numeric_traits<streamsize>::__min; 542 __large_ignore = true; 543 } 544 else 545 break; 546 } 547 548 if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max) 549 { 550 if (__large_ignore) 551 _M_gcount = __gnu_cxx::__numeric_traits<streamsize>::__max; 552 553 if (traits_type::eq_int_type(__c, __eof)) 554 __err |= ios_base::eofbit; 555 } 556 else if (_M_gcount < __n) 557 { 558 if (traits_type::eq_int_type(__c, __eof)) 559 __err |= ios_base::eofbit; 560 } 561 } 562 __catch(__cxxabiv1::__forced_unwind&) 563 { 564 this->_M_setstate(ios_base::badbit); 565 __throw_exception_again; 566 } 567 __catch(...) 568 { this->_M_setstate(ios_base::badbit); } 569 if (__err) 570 this->setstate(__err); 571 } 572 return *this; 573 } 574 575 template<typename _CharT, typename _Traits> 576 basic_istream<_CharT, _Traits>& 577 basic_istream<_CharT, _Traits>:: 578 ignore(streamsize __n, int_type __delim) 579 { 580 _M_gcount = 0; 581 sentry __cerb(*this, true); 582 if (__cerb && __n > 0) 583 { 584 ios_base::iostate __err = ios_base::goodbit; 585 __try 586 { 587 const int_type __eof = traits_type::eof(); 588 __streambuf_type* __sb = this->rdbuf(); 589 int_type __c = __sb->sgetc(); 590 591 // See comment above. 592 bool __large_ignore = false; 593 while (true) 594 { 595 while (_M_gcount < __n 596 && !traits_type::eq_int_type(__c, __eof) 597 && !traits_type::eq_int_type(__c, __delim)) 598 { 599 ++_M_gcount; 600 __c = __sb->snextc(); 601 } 602 if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max 603 && !traits_type::eq_int_type(__c, __eof) 604 && !traits_type::eq_int_type(__c, __delim)) 605 { 606 _M_gcount = 607 __gnu_cxx::__numeric_traits<streamsize>::__min; 608 __large_ignore = true; 609 } 610 else 611 break; 612 } 613 614 if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max) 615 { 616 if (__large_ignore) 617 _M_gcount = __gnu_cxx::__numeric_traits<streamsize>::__max; 618 619 if (traits_type::eq_int_type(__c, __eof)) 620 __err |= ios_base::eofbit; 621 else 622 { 623 if (_M_gcount != __n) 624 ++_M_gcount; 625 __sb->sbumpc(); 626 } 627 } 628 else if (_M_gcount < __n) // implies __c == __delim or EOF 629 { 630 if (traits_type::eq_int_type(__c, __eof)) 631 __err |= ios_base::eofbit; 632 else 633 { 634 ++_M_gcount; 635 __sb->sbumpc(); 636 } 637 } 638 } 639 __catch(__cxxabiv1::__forced_unwind&) 640 { 641 this->_M_setstate(ios_base::badbit); 642 __throw_exception_again; 643 } 644 __catch(...) 645 { this->_M_setstate(ios_base::badbit); } 646 if (__err) 647 this->setstate(__err); 648 } 649 return *this; 650 } 651 652 template<typename _CharT, typename _Traits> 653 typename basic_istream<_CharT, _Traits>::int_type 654 basic_istream<_CharT, _Traits>:: 655 peek(void) 656 { 657 int_type __c = traits_type::eof(); 658 _M_gcount = 0; 659 sentry __cerb(*this, true); 660 if (__cerb) 661 { 662 ios_base::iostate __err = ios_base::goodbit; 663 __try 664 { 665 __c = this->rdbuf()->sgetc(); 666 if (traits_type::eq_int_type(__c, traits_type::eof())) 667 __err |= ios_base::eofbit; 668 } 669 __catch(__cxxabiv1::__forced_unwind&) 670 { 671 this->_M_setstate(ios_base::badbit); 672 __throw_exception_again; 673 } 674 __catch(...) 675 { this->_M_setstate(ios_base::badbit); } 676 if (__err) 677 this->setstate(__err); 678 } 679 return __c; 680 } 681 682 template<typename _CharT, typename _Traits> 683 basic_istream<_CharT, _Traits>& 684 basic_istream<_CharT, _Traits>:: 685 read(char_type* __s, streamsize __n) 686 { 687 _M_gcount = 0; 688 sentry __cerb(*this, true); 689 if (__cerb) 690 { 691 ios_base::iostate __err = ios_base::goodbit; 692 __try 693 { 694 _M_gcount = this->rdbuf()->sgetn(__s, __n); 695 if (_M_gcount != __n) 696 __err |= (ios_base::eofbit | ios_base::failbit); 697 } 698 __catch(__cxxabiv1::__forced_unwind&) 699 { 700 this->_M_setstate(ios_base::badbit); 701 __throw_exception_again; 702 } 703 __catch(...) 704 { this->_M_setstate(ios_base::badbit); } 705 if (__err) 706 this->setstate(__err); 707 } 708 return *this; 709 } 710 711 template<typename _CharT, typename _Traits> 712 streamsize 713 basic_istream<_CharT, _Traits>:: 714 readsome(char_type* __s, streamsize __n) 715 { 716 _M_gcount = 0; 717 sentry __cerb(*this, true); 718 if (__cerb) 719 { 720 ios_base::iostate __err = ios_base::goodbit; 721 __try 722 { 723 // Cannot compare int_type with streamsize generically. 724 const streamsize __num = this->rdbuf()->in_avail(); 725 if (__num > 0) 726 _M_gcount = this->rdbuf()->sgetn(__s, std::min(__num, __n)); 727 else if (__num == -1) 728 __err |= ios_base::eofbit; 729 } 730 __catch(__cxxabiv1::__forced_unwind&) 731 { 732 this->_M_setstate(ios_base::badbit); 733 __throw_exception_again; 734 } 735 __catch(...) 736 { this->_M_setstate(ios_base::badbit); } 737 if (__err) 738 this->setstate(__err); 739 } 740 return _M_gcount; 741 } 742 743 template<typename _CharT, typename _Traits> 744 basic_istream<_CharT, _Traits>& 745 basic_istream<_CharT, _Traits>:: 746 putback(char_type __c) 747 { 748 // _GLIBCXX_RESOLVE_LIB_DEFECTS 749 // 60. What is a formatted input function? 750 _M_gcount = 0; 751 // Clear eofbit per N3168. 752 this->clear(this->rdstate() & ~ios_base::eofbit); 753 sentry __cerb(*this, true); 754 if (__cerb) 755 { 756 ios_base::iostate __err = ios_base::goodbit; 757 __try 758 { 759 const int_type __eof = traits_type::eof(); 760 __streambuf_type* __sb = this->rdbuf(); 761 if (!__sb 762 || traits_type::eq_int_type(__sb->sputbackc(__c), __eof)) 763 __err |= ios_base::badbit; 764 } 765 __catch(__cxxabiv1::__forced_unwind&) 766 { 767 this->_M_setstate(ios_base::badbit); 768 __throw_exception_again; 769 } 770 __catch(...) 771 { this->_M_setstate(ios_base::badbit); } 772 if (__err) 773 this->setstate(__err); 774 } 775 return *this; 776 } 777 778 template<typename _CharT, typename _Traits> 779 basic_istream<_CharT, _Traits>& 780 basic_istream<_CharT, _Traits>:: 781 unget(void) 782 { 783 // _GLIBCXX_RESOLVE_LIB_DEFECTS 784 // 60. What is a formatted input function? 785 _M_gcount = 0; 786 // Clear eofbit per N3168. 787 this->clear(this->rdstate() & ~ios_base::eofbit); 788 sentry __cerb(*this, true); 789 if (__cerb) 790 { 791 ios_base::iostate __err = ios_base::goodbit; 792 __try 793 { 794 const int_type __eof = traits_type::eof(); 795 __streambuf_type* __sb = this->rdbuf(); 796 if (!__sb 797 || traits_type::eq_int_type(__sb->sungetc(), __eof)) 798 __err |= ios_base::badbit; 799 } 800 __catch(__cxxabiv1::__forced_unwind&) 801 { 802 this->_M_setstate(ios_base::badbit); 803 __throw_exception_again; 804 } 805 __catch(...) 806 { this->_M_setstate(ios_base::badbit); } 807 if (__err) 808 this->setstate(__err); 809 } 810 return *this; 811 } 812 813 template<typename _CharT, typename _Traits> 814 int 815 basic_istream<_CharT, _Traits>:: 816 sync(void) 817 { 818 // _GLIBCXX_RESOLVE_LIB_DEFECTS 819 // DR60. Do not change _M_gcount. 820 int __ret = -1; 821 sentry __cerb(*this, true); 822 if (__cerb) 823 { 824 ios_base::iostate __err = ios_base::goodbit; 825 __try 826 { 827 __streambuf_type* __sb = this->rdbuf(); 828 if (__sb) 829 { 830 if (__sb->pubsync() == -1) 831 __err |= ios_base::badbit; 832 else 833 __ret = 0; 834 } 835 } 836 __catch(__cxxabiv1::__forced_unwind&) 837 { 838 this->_M_setstate(ios_base::badbit); 839 __throw_exception_again; 840 } 841 __catch(...) 842 { this->_M_setstate(ios_base::badbit); } 843 if (__err) 844 this->setstate(__err); 845 } 846 return __ret; 847 } 848 849 template<typename _CharT, typename _Traits> 850 typename basic_istream<_CharT, _Traits>::pos_type 851 basic_istream<_CharT, _Traits>:: 852 tellg(void) 853 { 854 // _GLIBCXX_RESOLVE_LIB_DEFECTS 855 // DR60. Do not change _M_gcount. 856 pos_type __ret = pos_type(-1); 857 sentry __cerb(*this, true); 858 if (__cerb) 859 { 860 __try 861 { 862 if (!this->fail()) 863 __ret = this->rdbuf()->pubseekoff(0, ios_base::cur, 864 ios_base::in); 865 } 866 __catch(__cxxabiv1::__forced_unwind&) 867 { 868 this->_M_setstate(ios_base::badbit); 869 __throw_exception_again; 870 } 871 __catch(...) 872 { this->_M_setstate(ios_base::badbit); } 873 } 874 return __ret; 875 } 876 877 template<typename _CharT, typename _Traits> 878 basic_istream<_CharT, _Traits>& 879 basic_istream<_CharT, _Traits>:: 880 seekg(pos_type __pos) 881 { 882 // _GLIBCXX_RESOLVE_LIB_DEFECTS 883 // DR60. Do not change _M_gcount. 884 // Clear eofbit per N3168. 885 this->clear(this->rdstate() & ~ios_base::eofbit); 886 sentry __cerb(*this, true); 887 if (__cerb) 888 { 889 ios_base::iostate __err = ios_base::goodbit; 890 __try 891 { 892 if (!this->fail()) 893 { 894 // 136. seekp, seekg setting wrong streams? 895 const pos_type __p = this->rdbuf()->pubseekpos(__pos, 896 ios_base::in); 897 898 // 129. Need error indication from seekp() and seekg() 899 if (__p == pos_type(off_type(-1))) 900 __err |= ios_base::failbit; 901 } 902 } 903 __catch(__cxxabiv1::__forced_unwind&) 904 { 905 this->_M_setstate(ios_base::badbit); 906 __throw_exception_again; 907 } 908 __catch(...) 909 { this->_M_setstate(ios_base::badbit); } 910 if (__err) 911 this->setstate(__err); 912 } 913 return *this; 914 } 915 916 template<typename _CharT, typename _Traits> 917 basic_istream<_CharT, _Traits>& 918 basic_istream<_CharT, _Traits>:: 919 seekg(off_type __off, ios_base::seekdir __dir) 920 { 921 // _GLIBCXX_RESOLVE_LIB_DEFECTS 922 // DR60. Do not change _M_gcount. 923 // Clear eofbit per N3168. 924 this->clear(this->rdstate() & ~ios_base::eofbit); 925 sentry __cerb(*this, true); 926 if (__cerb) 927 { 928 ios_base::iostate __err = ios_base::goodbit; 929 __try 930 { 931 if (!this->fail()) 932 { 933 // 136. seekp, seekg setting wrong streams? 934 const pos_type __p = this->rdbuf()->pubseekoff(__off, __dir, 935 ios_base::in); 936 937 // 129. Need error indication from seekp() and seekg() 938 if (__p == pos_type(off_type(-1))) 939 __err |= ios_base::failbit; 940 } 941 } 942 __catch(__cxxabiv1::__forced_unwind&) 943 { 944 this->_M_setstate(ios_base::badbit); 945 __throw_exception_again; 946 } 947 __catch(...) 948 { this->_M_setstate(ios_base::badbit); } 949 if (__err) 950 this->setstate(__err); 951 } 952 return *this; 953 } 954 955 // 27.6.1.2.3 Character extraction templates 956 template<typename _CharT, typename _Traits> 957 basic_istream<_CharT, _Traits>& 958 operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c) 959 { 960 typedef basic_istream<_CharT, _Traits> __istream_type; 961 typedef typename __istream_type::int_type __int_type; 962 963 typename __istream_type::sentry __cerb(__in, false); 964 if (__cerb) 965 { 966 ios_base::iostate __err = ios_base::goodbit; 967 __try 968 { 969 const __int_type __cb = __in.rdbuf()->sbumpc(); 970 if (!_Traits::eq_int_type(__cb, _Traits::eof())) 971 __c = _Traits::to_char_type(__cb); 972 else 973 __err |= (ios_base::eofbit | ios_base::failbit); 974 } 975 __catch(__cxxabiv1::__forced_unwind&) 976 { 977 __in._M_setstate(ios_base::badbit); 978 __throw_exception_again; 979 } 980 __catch(...) 981 { __in._M_setstate(ios_base::badbit); } 982 if (__err) 983 __in.setstate(__err); 984 } 985 return __in; 986 } 987 988 template<typename _CharT, typename _Traits> 989 void 990 __istream_extract(basic_istream<_CharT, _Traits>& __in, _CharT* __s, 991 streamsize __num) 992 { 993 typedef basic_istream<_CharT, _Traits> __istream_type; 994 typedef basic_streambuf<_CharT, _Traits> __streambuf_type; 995 typedef typename _Traits::int_type int_type; 996 typedef _CharT char_type; 997 typedef ctype<_CharT> __ctype_type; 998 999 streamsize __extracted = 0; 1000 ios_base::iostate __err = ios_base::goodbit; 1001 typename __istream_type::sentry __cerb(__in, false); 1002 if (__cerb) 1003 { 1004 __try 1005 { 1006 // Figure out how many characters to extract. 1007 streamsize __width = __in.width(); 1008 if (0 < __width && __width < __num) 1009 __num = __width; 1010 1011 const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc()); 1012 1013 const int_type __eof = _Traits::eof(); 1014 __streambuf_type* __sb = __in.rdbuf(); 1015 int_type __c = __sb->sgetc(); 1016 1017 while (__extracted < __num - 1 1018 && !_Traits::eq_int_type(__c, __eof) 1019 && !__ct.is(ctype_base::space, 1020 _Traits::to_char_type(__c))) 1021 { 1022 *__s++ = _Traits::to_char_type(__c); 1023 ++__extracted; 1024 __c = __sb->snextc(); 1025 } 1026 1027 if (__extracted < __num - 1 1028 && _Traits::eq_int_type(__c, __eof)) 1029 __err |= ios_base::eofbit; 1030 1031 // _GLIBCXX_RESOLVE_LIB_DEFECTS 1032 // 68. Extractors for char* should store null at end 1033 *__s = char_type(); 1034 __in.width(0); 1035 } 1036 __catch(__cxxabiv1::__forced_unwind&) 1037 { 1038 __in._M_setstate(ios_base::badbit); 1039 __throw_exception_again; 1040 } 1041 __catch(...) 1042 { __in._M_setstate(ios_base::badbit); } 1043 } 1044 if (!__extracted) 1045 __err |= ios_base::failbit; 1046 if (__err) 1047 __in.setstate(__err); 1048 } 1049 1050 // 27.6.1.4 Standard basic_istream manipulators 1051 template<typename _CharT, typename _Traits> 1052 basic_istream<_CharT, _Traits>& 1053 ws(basic_istream<_CharT, _Traits>& __in) 1054 { 1055 typedef basic_istream<_CharT, _Traits> __istream_type; 1056 typedef basic_streambuf<_CharT, _Traits> __streambuf_type; 1057 typedef typename __istream_type::int_type __int_type; 1058 typedef ctype<_CharT> __ctype_type; 1059 1060 const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc()); 1061 const __int_type __eof = _Traits::eof(); 1062 __streambuf_type* __sb = __in.rdbuf(); 1063 __int_type __c = __sb->sgetc(); 1064 1065 while (!_Traits::eq_int_type(__c, __eof) 1066 && __ct.is(ctype_base::space, _Traits::to_char_type(__c))) 1067 __c = __sb->snextc(); 1068 1069 if (_Traits::eq_int_type(__c, __eof)) 1070 __in.setstate(ios_base::eofbit); 1071 return __in; 1072 } 1073 1074 // Inhibit implicit instantiations for required instantiations, 1075 // which are defined via explicit instantiations elsewhere. 1076 #if _GLIBCXX_EXTERN_TEMPLATE 1077 extern template class basic_istream<char>; 1078 extern template istream& ws(istream&); 1079 extern template istream& operator>>(istream&, char&); 1080 extern template istream& operator>>(istream&, unsigned char&); 1081 extern template istream& operator>>(istream&, signed char&); 1082 1083 extern template istream& istream::_M_extract(unsigned short&); 1084 extern template istream& istream::_M_extract(unsigned int&); 1085 extern template istream& istream::_M_extract(long&); 1086 extern template istream& istream::_M_extract(unsigned long&); 1087 extern template istream& istream::_M_extract(bool&); 1088 #ifdef _GLIBCXX_USE_LONG_LONG 1089 extern template istream& istream::_M_extract(long long&); 1090 extern template istream& istream::_M_extract(unsigned long long&); 1091 #endif 1092 extern template istream& istream::_M_extract(float&); 1093 extern template istream& istream::_M_extract(double&); 1094 extern template istream& istream::_M_extract(long double&); 1095 extern template istream& istream::_M_extract(void*&); 1096 1097 extern template class basic_iostream<char>; 1098 1099 #ifdef _GLIBCXX_USE_WCHAR_T 1100 extern template class basic_istream<wchar_t>; 1101 extern template wistream& ws(wistream&); 1102 extern template wistream& operator>>(wistream&, wchar_t&); 1103 extern template void __istream_extract(wistream&, wchar_t*, streamsize); 1104 1105 extern template wistream& wistream::_M_extract(unsigned short&); 1106 extern template wistream& wistream::_M_extract(unsigned int&); 1107 extern template wistream& wistream::_M_extract(long&); 1108 extern template wistream& wistream::_M_extract(unsigned long&); 1109 extern template wistream& wistream::_M_extract(bool&); 1110 #ifdef _GLIBCXX_USE_LONG_LONG 1111 extern template wistream& wistream::_M_extract(long long&); 1112 extern template wistream& wistream::_M_extract(unsigned long long&); 1113 #endif 1114 extern template wistream& wistream::_M_extract(float&); 1115 extern template wistream& wistream::_M_extract(double&); 1116 extern template wistream& wistream::_M_extract(long double&); 1117 extern template wistream& wistream::_M_extract(void*&); 1118 1119 extern template class basic_iostream<wchar_t>; 1120 #endif 1121 #endif 1122 1123 _GLIBCXX_END_NAMESPACE_VERSION 1124 } // namespace std 1125 1126 #endif
Contact us
|
About us
|
Term of use
|
Copyright © 2000-2025 MyWebUniversity.com ™
