1 // Input streams -*- C++ -*- 2 3 // Copyright (C) 2004-2022 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 // 26 // ISO C++ 14882: 27.6.1 Input streams 27 // 28 29 #include <istream> 30 31 namespace std _GLIBCXX_VISIBILITY(default) 32 { 33 _GLIBCXX_BEGIN_NAMESPACE_VERSION 34 35 template<> 36 basic_istream<char>& 37 basic_istream<char>:: 38 getline(char_type* __s, streamsize __n, char_type __delim) 39 { 40 _M_gcount = 0; 41 ios_base::iostate __err = ios_base::goodbit; 42 sentry __cerb(*this, true); 43 if (__cerb) 44 { 45 __try 46 { 47 const int_type __idelim = traits_type::to_int_type(__delim); 48 const int_type __eof = traits_type::eof(); 49 __streambuf_type* __sb = this->rdbuf(); 50 int_type __c = __sb->sgetc(); 51 52 while (_M_gcount + 1 < __n 53 && !traits_type::eq_int_type(__c, __eof) 54 && !traits_type::eq_int_type(__c, __idelim)) 55 { 56 streamsize __size = std::min(streamsize(__sb->egptr() 57 - __sb->gptr()), 58 streamsize(__n - _M_gcount 59 - 1)); 60 if (__size > 1) 61 { 62 const char_type* __p = traits_type::find(__sb->gptr(), 63 __size, 64 __delim); 65 if (__p) 66 __size = __p - __sb->gptr(); 67 traits_type::copy(__s, __sb->gptr(), __size); 68 __s += __size; 69 __sb->__safe_gbump(__size); 70 _M_gcount += __size; 71 __c = __sb->sgetc(); 72 } 73 else 74 { 75 *__s++ = traits_type::to_char_type(__c); 76 ++_M_gcount; 77 __c = __sb->snextc(); 78 } 79 } 80 81 if (traits_type::eq_int_type(__c, __eof)) 82 __err |= ios_base::eofbit; 83 else if (traits_type::eq_int_type(__c, __idelim)) 84 { 85 ++_M_gcount; 86 __sb->sbumpc(); 87 } 88 else 89 __err |= ios_base::failbit; 90 } 91 __catch(__cxxabiv1::__forced_unwind&) 92 { 93 this->_M_setstate(ios_base::badbit); 94 __throw_exception_again; 95 } 96 __catch(...) 97 { this->_M_setstate(ios_base::badbit); } 98 } 99 // _GLIBCXX_RESOLVE_LIB_DEFECTS 100 // 243. get and getline when sentry reports failure. 101 if (__n > 0) 102 *__s = char_type(); 103 if (!_M_gcount) 104 __err |= ios_base::failbit; 105 if (__err) 106 this->setstate(__err); 107 return *this; 108 } 109 110 template<> 111 basic_istream<char>& 112 basic_istream<char>:: 113 ignore(streamsize __n, int_type __delim) 114 { 115 #ifdef _GLIBCXX_COMPAT_ 116 if (traits_type::eq_int_type(__delim, traits_type::eof())) 117 return ignore(__n); 118 #endif 119 120 _M_gcount = 0; 121 sentry __cerb(*this, true); 122 if (__n > 0 && __cerb) 123 { 124 ios_base::iostate __err = ios_base::goodbit; 125 __try 126 { 127 const char_type __cdelim = traits_type::to_char_type(__delim); 128 const int_type __eof = traits_type::eof(); 129 __streambuf_type* __sb = this->rdbuf(); 130 int_type __c = __sb->sgetc(); 131 132 bool __large_ignore = false; 133 while (true) 134 { 135 while (_M_gcount < __n 136 && !traits_type::eq_int_type(__c, __eof) 137 && !traits_type::eq_int_type(__c, __delim)) 138 { 139 streamsize __size = std::min(streamsize(__sb->egptr() 140 - __sb->gptr()), 141 streamsize(__n - _M_gcount)); 142 if (__size > 1) 143 { 144 const char_type* __p = traits_type::find(__sb->gptr(), 145 __size, 146 __cdelim); 147 if (__p) 148 __size = __p - __sb->gptr(); 149 __sb->__safe_gbump(__size); 150 _M_gcount += __size; 151 __c = __sb->sgetc(); 152 } 153 else 154 { 155 ++_M_gcount; 156 __c = __sb->snextc(); 157 } 158 } 159 if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max 160 && !traits_type::eq_int_type(__c, __eof) 161 && !traits_type::eq_int_type(__c, __delim)) 162 { 163 _M_gcount = 164 __gnu_cxx::__numeric_traits<streamsize>::__min; 165 __large_ignore = true; 166 } 167 else 168 break; 169 } 170 171 if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max) 172 { 173 if (__large_ignore) 174 _M_gcount = __gnu_cxx::__numeric_traits<streamsize>::__max; 175 176 if (traits_type::eq_int_type(__c, __eof)) 177 __err |= ios_base::eofbit; 178 else 179 { 180 if (_M_gcount != __n) 181 ++_M_gcount; 182 __sb->sbumpc(); 183 } 184 } 185 else if (_M_gcount < __n) // implies __c == __delim or EOF 186 { 187 if (traits_type::eq_int_type(__c, __eof)) 188 __err |= ios_base::eofbit; 189 else 190 { 191 ++_M_gcount; 192 __sb->sbumpc(); 193 } 194 } 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 void 210 __istream_extract(istream& __in, char* __s, streamsize __num) 211 { 212 typedef basic_istream<char> __istream_type; 213 typedef __istream_type::int_type __int_type; 214 typedef __istream_type::char_type __char_type; 215 typedef __istream_type::traits_type __traits_type; 216 typedef __istream_type::__streambuf_type __streambuf_type; 217 typedef __istream_type::__ctype_type __ctype_type; 218 219 streamsize __extracted = 0; 220 ios_base::iostate __err = ios_base::goodbit; 221 __istream_type::sentry __cerb(__in, false); 222 if (__cerb) 223 { 224 __try 225 { 226 // Figure out how many characters to extract. 227 streamsize __width = __in.width(); 228 if (0 < __width && __width < __num) 229 __num = __width; 230 231 const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc()); 232 233 const __int_type __eof = __traits_type::eof(); 234 __streambuf_type* __sb = __in.rdbuf(); 235 __int_type __c = __sb->sgetc(); 236 237 while (__extracted < __num - 1 238 && !__traits_type::eq_int_type(__c, __eof) 239 && !__ct.is(ctype_base::space, 240 __traits_type::to_char_type(__c))) 241 { 242 streamsize __size = std::min(streamsize(__sb->egptr() 243 - __sb->gptr()), 244 streamsize(__num - __extracted 245 - 1)); 246 if (__size > 1) 247 { 248 __size = (__ct.scan_is(ctype_base::space, 249 __sb->gptr() + 1, 250 __sb->gptr() + __size) 251 - __sb->gptr()); 252 __traits_type::copy(__s, __sb->gptr(), __size); 253 __s += __size; 254 __sb->__safe_gbump(__size); 255 __extracted += __size; 256 __c = __sb->sgetc(); 257 } 258 else 259 { 260 *__s++ = __traits_type::to_char_type(__c); 261 ++__extracted; 262 __c = __sb->snextc(); 263 } 264 } 265 266 if (__extracted < __num - 1 267 && __traits_type::eq_int_type(__c, __eof)) 268 __err |= ios_base::eofbit; 269 270 // _GLIBCXX_RESOLVE_LIB_DEFECTS 271 // 68. Extractors for char* should store null at end 272 *__s = __char_type(); 273 __in.width(0); 274 } 275 __catch(__cxxabiv1::__forced_unwind&) 276 { 277 __in._M_setstate(ios_base::badbit); 278 __throw_exception_again; 279 } 280 __catch(...) 281 { __in._M_setstate(ios_base::badbit); } 282 } 283 if (!__extracted) 284 __err |= ios_base::failbit; 285 if (__err) 286 __in.setstate(__err); 287 } 288 289 #ifdef _GLIBCXX_USE_WCHAR_T 290 template<> 291 basic_istream<wchar_t>& 292 basic_istream<wchar_t>:: 293 getline(char_type* __s, streamsize __n, char_type __delim) 294 { 295 _M_gcount = 0; 296 ios_base::iostate __err = ios_base::goodbit; 297 sentry __cerb(*this, true); 298 if (__cerb) 299 { 300 __try 301 { 302 const int_type __idelim = traits_type::to_int_type(__delim); 303 const int_type __eof = traits_type::eof(); 304 __streambuf_type* __sb = this->rdbuf(); 305 int_type __c = __sb->sgetc(); 306 307 while (_M_gcount + 1 < __n 308 && !traits_type::eq_int_type(__c, __eof) 309 && !traits_type::eq_int_type(__c, __idelim)) 310 { 311 streamsize __size = std::min(streamsize(__sb->egptr() 312 - __sb->gptr()), 313 streamsize(__n - _M_gcount 314 - 1)); 315 if (__size > 1) 316 { 317 const char_type* __p = traits_type::find(__sb->gptr(), 318 __size, 319 __delim); 320 if (__p) 321 __size = __p - __sb->gptr(); 322 traits_type::copy(__s, __sb->gptr(), __size); 323 __s += __size; 324 __sb->__safe_gbump(__size); 325 _M_gcount += __size; 326 __c = __sb->sgetc(); 327 } 328 else 329 { 330 *__s++ = traits_type::to_char_type(__c); 331 ++_M_gcount; 332 __c = __sb->snextc(); 333 } 334 } 335 336 if (traits_type::eq_int_type(__c, __eof)) 337 __err |= ios_base::eofbit; 338 else if (traits_type::eq_int_type(__c, __idelim)) 339 { 340 ++_M_gcount; 341 __sb->sbumpc(); 342 } 343 else 344 __err |= ios_base::failbit; 345 } 346 __catch(__cxxabiv1::__forced_unwind&) 347 { 348 this->_M_setstate(ios_base::badbit); 349 __throw_exception_again; 350 } 351 __catch(...) 352 { this->_M_setstate(ios_base::badbit); } 353 } 354 // _GLIBCXX_RESOLVE_LIB_DEFECTS 355 // 243. get and getline when sentry reports failure. 356 if (__n > 0) 357 *__s = char_type(); 358 if (!_M_gcount) 359 __err |= ios_base::failbit; 360 if (__err) 361 this->setstate(__err); 362 return *this; 363 } 364 365 template<> 366 basic_istream<wchar_t>& 367 basic_istream<wchar_t>:: 368 ignore(streamsize __n, int_type __delim) 369 { 370 #ifdef _GLIBCXX_COMPAT_ 371 if (traits_type::eq_int_type(__delim, traits_type::eof())) 372 return ignore(__n); 373 #endif 374 375 _M_gcount = 0; 376 sentry __cerb(*this, true); 377 if (__n > 0 && __cerb) 378 { 379 ios_base::iostate __err = ios_base::goodbit; 380 __try 381 { 382 const char_type __cdelim = traits_type::to_char_type(__delim); 383 const int_type __eof = traits_type::eof(); 384 __streambuf_type* __sb = this->rdbuf(); 385 int_type __c = __sb->sgetc(); 386 387 bool __large_ignore = false; 388 while (true) 389 { 390 while (_M_gcount < __n 391 && !traits_type::eq_int_type(__c, __eof) 392 && !traits_type::eq_int_type(__c, __delim)) 393 { 394 streamsize __size = std::min(streamsize(__sb->egptr() 395 - __sb->gptr()), 396 streamsize(__n - _M_gcount)); 397 if (__size > 1) 398 { 399 const char_type* __p = traits_type::find(__sb->gptr(), 400 __size, 401 __cdelim); 402 if (__p) 403 __size = __p - __sb->gptr(); 404 __sb->__safe_gbump(__size); 405 _M_gcount += __size; 406 __c = __sb->sgetc(); 407 } 408 else 409 { 410 ++_M_gcount; 411 __c = __sb->snextc(); 412 } 413 } 414 if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max 415 && !traits_type::eq_int_type(__c, __eof) 416 && !traits_type::eq_int_type(__c, __delim)) 417 { 418 _M_gcount = 419 __gnu_cxx::__numeric_traits<streamsize>::__min; 420 __large_ignore = true; 421 } 422 else 423 break; 424 } 425 426 if (__n == __gnu_cxx::__numeric_traits<streamsize>::__max) 427 { 428 if (__large_ignore) 429 _M_gcount = __gnu_cxx::__numeric_traits<streamsize>::__max; 430 431 if (traits_type::eq_int_type(__c, __eof)) 432 __err |= ios_base::eofbit; 433 else 434 { 435 if (_M_gcount != __n) 436 ++_M_gcount; 437 __sb->sbumpc(); 438 } 439 } 440 else if (_M_gcount < __n) // implies __c == __delim or EOF 441 { 442 if (traits_type::eq_int_type(__c, __eof)) 443 __err |= ios_base::eofbit; 444 else 445 { 446 ++_M_gcount; 447 __sb->sbumpc(); 448 } 449 } 450 } 451 __catch(__cxxabiv1::__forced_unwind&) 452 { 453 this->_M_setstate(ios_base::badbit); 454 __throw_exception_again; 455 } 456 __catch(...) 457 { this->_M_setstate(ios_base::badbit); } 458 if (__err) 459 this->setstate(__err); 460 } 461 return *this; 462 } 463 #endif 464 465 466 _GLIBCXX_END_NAMESPACE_VERSION 467 } // namespace 468