libstdc++-v3/include/ext/vstring.tcc

   1 // Versatile string -*- C++ -*-
   2
   3 // Copyright (C) 2005-2024 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 ext/vstring.tcc
  26  *  This is an internal header file, included by other library headers.
  27  *  Do not attempt to use it directly. @headername{ext/vstring.h}
  28  */
  29
  30 #ifndef _VSTRING_TCC
  31 #define _VSTRING_TCC 1
  32
  33 #pragma GCC system_header
  34
  35 #include <bits/requires_hosted.h> // GNU extensions are currently omitted
  36
  37 #include <bits/cxxabi_forced.h>
  38
  39 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
  40 {
  41 _GLIBCXX_BEGIN_NAMESPACE_VERSION
  42
  43   template<typename _CharT, typename _Traits, typename _Alloc,
  44            template <typename, typename, typename> class _Base>
  45     const typename __versa_string<_CharT, _Traits, _Alloc, _Base>::size_type
  46     __versa_string<_CharT, _Traits, _Alloc, _Base>::npos;
  47
  48   template<typename _CharT, typename _Traits, typename _Alloc,
  49            template <typename, typename, typename> class _Base>
  50     void
  51     __versa_string<_CharT, _Traits, _Alloc, _Base>::
  52     resize(size_type __n, _CharT __c)
  53     {
  54       const size_type __size = this->size();
  55       if (__size < __n)
  56         this->append(__n - __size, __c);
  57       else if (__n < __size)
  58         this->_M_erase(__n, __size - __n);
  59     }
  60
  61   template<typename _CharT, typename _Traits, typename _Alloc,
  62            template <typename, typename, typename> class _Base>
  63     __versa_string<_CharT, _Traits, _Alloc, _Base>&
  64     __versa_string<_CharT, _Traits, _Alloc, _Base>::
  65     _M_append(const _CharT* __s, size_type __n)
  66     {
  67       const size_type __len = __n + this->size();
  68
  69       if (__len <= this->capacity() && !this->_M_is_shared())
  70         {
  71           if (__n)
  72             this->_S_copy(this->_M_data() + this->size(), __s, __n);
  73         }
  74       else
  75         this->_M_mutate(this->size(), size_type(0), __s, __n);
  76
  77       this->_M_set_length(__len);
  78       return *this;
  79     }
  80
  81   template<typename _CharT, typename _Traits, typename _Alloc,
  82            template <typename, typename, typename> class _Base>
  83     template<typename _InputIterator>
  84       __versa_string<_CharT, _Traits, _Alloc, _Base>&
  85       __versa_string<_CharT, _Traits, _Alloc, _Base>::
  86       _M_replace_dispatch(const_iterator __i1, const_iterator __i2,
  87                           _InputIterator __k1, _InputIterator __k2,
  88                           std::__false_type)
  89       {
  90         const __versa_string __s(__k1, __k2);
  91         const size_type __n1 = __i2 - __i1;
  92         return _M_replace(__i1 - _M_ibegin(), __n1, __s._M_data(),
  93                           __s.size());
  94       }
  95
  96   template<typename _CharT, typename _Traits, typename _Alloc,
  97            template <typename, typename, typename> class _Base>
  98     __versa_string<_CharT, _Traits, _Alloc, _Base>&
  99     __versa_string<_CharT, _Traits, _Alloc, _Base>::
 100     _M_replace_aux(size_type __pos1, size_type __n1, size_type __n2,
 101                    _CharT __c)
 102     {
 103       _M_check_length(__n1, __n2, "__versa_string::_M_replace_aux");
 104
 105       const size_type __old_size = this->size();
 106       const size_type __new_size = __old_size + __n2 - __n1;
 107
 108       if (__new_size <= this->capacity() && !this->_M_is_shared())
 109         {
 110           _CharT* __p = this->_M_data() + __pos1;
 111
 112           const size_type __how_much = __old_size - __pos1 - __n1;
 113           if (__how_much && __n1 != __n2)
 114             this->_S_move(__p + __n2, __p + __n1, __how_much);
 115         }
 116       else
 117         this->_M_mutate(__pos1, __n1, 0, __n2);
 118
 119       if (__n2)
 120         this->_S_assign(this->_M_data() + __pos1, __n2, __c);
 121
 122       this->_M_set_length(__new_size);
 123       return *this;
 124     }
 125
 126   template<typename _CharT, typename _Traits, typename _Alloc,
 127            template <typename, typename, typename> class _Base>
 128     __versa_string<_CharT, _Traits, _Alloc, _Base>&
 129     __versa_string<_CharT, _Traits, _Alloc, _Base>::
 130     _M_replace(size_type __pos, size_type __len1, const _CharT* __s,
 131                const size_type __len2)
 132     {
 133       _M_check_length(__len1, __len2, "__versa_string::_M_replace");
 134
 135       const size_type __old_size = this->size();
 136       const size_type __new_size = __old_size + __len2 - __len1;
 137
 138       if (__new_size <= this->capacity() && !this->_M_is_shared())
 139         {
 140           _CharT* __p = this->_M_data() + __pos;
 141
 142           const size_type __how_much = __old_size - __pos - __len1;
 143           if (_M_disjunct(__s))
 144             {
 145               if (__how_much && __len1 != __len2)
 146                 this->_S_move(__p + __len2, __p + __len1, __how_much);
 147               if (__len2)
 148                 this->_S_copy(__p, __s, __len2);
 149             }
 150           else
 151             {
 152               // Work in-place.
 153               if (__len2 && __len2 <= __len1)
 154                 this->_S_move(__p, __s, __len2);
 155               if (__how_much && __len1 != __len2)
 156                 this->_S_move(__p + __len2, __p + __len1, __how_much);
 157               if (__len2 > __len1)
 158                 {
 159                   if (__s + __len2 <= __p + __len1)
 160                     this->_S_move(__p, __s, __len2);
 161                   else if (__s >= __p + __len1)
 162                     this->_S_copy(__p, __s + __len2 - __len1, __len2);
 163                   else
 164                     {
 165                       const size_type __nleft = (__p + __len1) - __s;
 166                       this->_S_move(__p, __s, __nleft);
 167                       this->_S_copy(__p + __nleft, __p + __len2,
 168                                     __len2 - __nleft);
 169                     }
 170                 }
 171             }
 172         }
 173       else
 174         this->_M_mutate(__pos, __len1, __s, __len2);
 175
 176       this->_M_set_length(__new_size);
 177       return *this;
 178     }
 179
 180   template<typename _CharT, typename _Traits, typename _Alloc,
 181            template <typename, typename, typename> class _Base>
 182     __versa_string<_CharT, _Traits, _Alloc, _Base>
 183     operator+(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
 184               const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs)
 185     {
 186       __versa_string<_CharT, _Traits, _Alloc, _Base> __str;
 187       __str.reserve(__lhs.size() + __rhs.size());
 188       __str.append(__lhs);
 189       __str.append(__rhs);
 190       return __str;
 191     }
 192
 193   template<typename _CharT, typename _Traits, typename _Alloc,
 194            template <typename, typename, typename> class _Base>
 195     __versa_string<_CharT, _Traits, _Alloc, _Base>
 196     operator+(const _CharT* __lhs,
 197               const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs)
 198     {
 199       __glibcxx_requires_string(__lhs);
 200       typedef __versa_string<_CharT, _Traits, _Alloc, _Base> __string_type;
 201       typedef typename __string_type::size_type   __size_type;
 202       const __size_type __len = _Traits::length(__lhs);
 203       __string_type __str;
 204       __str.reserve(__len + __rhs.size());
 205       __str.append(__lhs, __len);
 206       __str.append(__rhs);
 207       return __str;
 208     }
 209
 210   template<typename _CharT, typename _Traits, typename _Alloc,
 211            template <typename, typename, typename> class _Base>
 212     __versa_string<_CharT, _Traits, _Alloc, _Base>
 213     operator+(_CharT __lhs,
 214               const __versa_string<_CharT, _Traits, _Alloc, _Base>& __rhs)
 215     {
 216       __versa_string<_CharT, _Traits, _Alloc, _Base> __str;
 217       __str.reserve(__rhs.size() + 1);
 218       __str.push_back(__lhs);
 219       __str.append(__rhs);
 220       return __str;
 221     }
 222
 223   template<typename _CharT, typename _Traits, typename _Alloc,
 224            template <typename, typename, typename> class _Base>
 225     __versa_string<_CharT, _Traits, _Alloc, _Base>
 226     operator+(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
 227               const _CharT* __rhs)
 228     {
 229       __glibcxx_requires_string(__rhs);
 230       typedef __versa_string<_CharT, _Traits, _Alloc, _Base> __string_type;
 231       typedef typename __string_type::size_type   __size_type;
 232       const __size_type __len = _Traits::length(__rhs);
 233       __string_type __str;
 234       __str.reserve(__lhs.size() + __len);
 235       __str.append(__lhs);
 236       __str.append(__rhs, __len);
 237       return __str;
 238     }
 239
 240   template<typename _CharT, typename _Traits, typename _Alloc,
 241            template <typename, typename, typename> class _Base>
 242     __versa_string<_CharT, _Traits, _Alloc, _Base>
 243     operator+(const __versa_string<_CharT, _Traits, _Alloc, _Base>& __lhs,
 244               _CharT __rhs)
 245     {
 246       __versa_string<_CharT, _Traits, _Alloc, _Base> __str;
 247       __str.reserve(__lhs.size() + 1);
 248       __str.append(__lhs);
 249       __str.push_back(__rhs);
 250       return __str;
 251     }
 252
 253   template<typename _CharT, typename _Traits, typename _Alloc,
 254            template <typename, typename, typename> class _Base>
 255     typename __versa_string<_CharT, _Traits, _Alloc, _Base>::size_type
 256     __versa_string<_CharT, _Traits, _Alloc, _Base>::
 257     copy(_CharT* __s, size_type __n, size_type __pos) const
 258     {
 259       _M_check(__pos, "__versa_string::copy");
 260       __n = _M_limit(__pos, __n);
 261       __glibcxx_requires_string_len(__s, __n);
 262       if (__n)
 263         this->_S_copy(__s, this->_M_data() + __pos, __n);
 264       // 21.3.5.7 par 3: do not append null.  (good.)
 265       return __n;
 266     }
 267
 268   template<typename _CharT, typename _Traits, typename _Alloc,
 269            template <typename, typename, typename> class _Base>
 270     typename __versa_string<_CharT, _Traits, _Alloc, _Base>::size_type
 271     __versa_string<_CharT, _Traits, _Alloc, _Base>::
 272     find(const _CharT* __s, size_type __pos, size_type __n) const
 273     {
 274       __glibcxx_requires_string_len(__s, __n);
 275       const size_type __size = this->size();
 276       const _CharT* __data = this->_M_data();
 277
 278       if (__n == 0)
 279         return __pos <= __size ? __pos : npos;
 280
 281       if (__n <= __size)
 282         {
 283           for (; __pos <= __size - __n; ++__pos)
 284             if (traits_type::eq(__data[__pos], __s[0])
 285                 && traits_type::compare(__data + __pos + 1,
 286                                         __s + 1, __n - 1) == 0)
 287               return __pos;
 288         }
 289       return npos;
 290     }
 291
 292   template<typename _CharT, typename _Traits, typename _Alloc,
 293            template <typename, typename, typename> class _Base>
 294     typename __versa_string<_CharT, _Traits, _Alloc, _Base>::size_type
 295     __versa_string<_CharT, _Traits, _Alloc, _Base>::
 296     find(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT
 297     {
 298       size_type __ret = npos;
 299       const size_type __size = this->size();
 300       if (__pos < __size)
 301         {
 302           const _CharT* __data = this->_M_data();
 303           const size_type __n = __size - __pos;
 304           const _CharT* __p = traits_type::find(__data + __pos, __n, __c);
 305           if (__p)
 306             __ret = __p - __data;
 307         }
 308       return __ret;
 309     }
 310
 311   template<typename _CharT, typename _Traits, typename _Alloc,
 312            template <typename, typename, typename> class _Base>
 313     typename __versa_string<_CharT, _Traits, _Alloc, _Base>::size_type
 314     __versa_string<_CharT, _Traits, _Alloc, _Base>::
 315     rfind(const _CharT* __s, size_type __pos, size_type __n) const
 316     {
 317       __glibcxx_requires_string_len(__s, __n);
 318       const size_type __size = this->size();
 319       if (__n <= __size)
 320         {
 321           __pos = std::min(size_type(__size - __n), __pos);
 322           const _CharT* __data = this->_M_data();
 323           do
 324             {
 325               if (traits_type::compare(__data + __pos, __s, __n) == 0)
 326                 return __pos;
 327             }
 328           while (__pos-- > 0);
 329         }
 330       return npos;
 331     }
 332
 333   template<typename _CharT, typename _Traits, typename _Alloc,
 334            template <typename, typename, typename> class _Base>
 335     typename __versa_string<_CharT, _Traits, _Alloc, _Base>::size_type
 336     __versa_string<_CharT, _Traits, _Alloc, _Base>::
 337     rfind(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT
 338     {
 339       size_type __size = this->size();
 340       if (__size)
 341         {
 342           if (--__size > __pos)
 343             __size = __pos;
 344           for (++__size; __size-- > 0; )
 345             if (traits_type::eq(this->_M_data()[__size], __c))
 346               return __size;
 347         }
 348       return npos;
 349     }
 350
 351   template<typename _CharT, typename _Traits, typename _Alloc,
 352            template <typename, typename, typename> class _Base>
 353     typename __versa_string<_CharT, _Traits, _Alloc, _Base>::size_type
 354     __versa_string<_CharT, _Traits, _Alloc, _Base>::
 355     find_first_of(const _CharT* __s, size_type __pos, size_type __n) const
 356     {
 357       __glibcxx_requires_string_len(__s, __n);
 358       for (; __n && __pos < this->size(); ++__pos)
 359         {
 360           const _CharT* __p = traits_type::find(__s, __n,
 361                                                 this->_M_data()[__pos]);
 362           if (__p)
 363             return __pos;
 364         }
 365       return npos;
 366     }
 367
 368   template<typename _CharT, typename _Traits, typename _Alloc,
 369            template <typename, typename, typename> class _Base>
 370     typename __versa_string<_CharT, _Traits, _Alloc, _Base>::size_type
 371     __versa_string<_CharT, _Traits, _Alloc, _Base>::
 372     find_last_of(const _CharT* __s, size_type __pos, size_type __n) const
 373     {
 374       __glibcxx_requires_string_len(__s, __n);
 375       size_type __size = this->size();
 376       if (__size && __n)
 377         {
 378           if (--__size > __pos)
 379             __size = __pos;
 380           do
 381             {
 382               if (traits_type::find(__s, __n, this->_M_data()[__size]))
 383                 return __size;
 384             }
 385           while (__size-- != 0);
 386         }
 387       return npos;
 388     }
 389
 390   template<typename _CharT, typename _Traits, typename _Alloc,
 391            template <typename, typename, typename> class _Base>
 392     typename __versa_string<_CharT, _Traits, _Alloc, _Base>::size_type
 393     __versa_string<_CharT, _Traits, _Alloc, _Base>::
 394     find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const
 395     {
 396       __glibcxx_requires_string_len(__s, __n);
 397       for (; __pos < this->size(); ++__pos)
 398         if (!traits_type::find(__s, __n, this->_M_data()[__pos]))
 399           return __pos;
 400       return npos;
 401     }
 402
 403   template<typename _CharT, typename _Traits, typename _Alloc,
 404            template <typename, typename, typename> class _Base>
 405     typename __versa_string<_CharT, _Traits, _Alloc, _Base>::size_type
 406     __versa_string<_CharT, _Traits, _Alloc, _Base>::
 407     find_first_not_of(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT
 408     {
 409       for (; __pos < this->size(); ++__pos)
 410         if (!traits_type::eq(this->_M_data()[__pos], __c))
 411           return __pos;
 412       return npos;
 413     }
 414
 415   template<typename _CharT, typename _Traits, typename _Alloc,
 416            template <typename, typename, typename> class _Base>
 417     typename __versa_string<_CharT, _Traits, _Alloc, _Base>::size_type
 418     __versa_string<_CharT, _Traits, _Alloc, _Base>::
 419     find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const
 420     {
 421       __glibcxx_requires_string_len(__s, __n);
 422       size_type __size = this->size();
 423       if (__size)
 424         {
 425           if (--__size > __pos)
 426             __size = __pos;
 427           do
 428             {
 429               if (!traits_type::find(__s, __n, this->_M_data()[__size]))
 430                 return __size;
 431             }
 432           while (__size--);
 433         }
 434       return npos;
 435     }
 436
 437   template<typename _CharT, typename _Traits, typename _Alloc,
 438            template <typename, typename, typename> class _Base>
 439     typename __versa_string<_CharT, _Traits, _Alloc, _Base>::size_type
 440     __versa_string<_CharT, _Traits, _Alloc, _Base>::
 441     find_last_not_of(_CharT __c, size_type __pos) const _GLIBCXX_NOEXCEPT
 442     {
 443       size_type __size = this->size();
 444       if (__size)
 445         {
 446           if (--__size > __pos)
 447             __size = __pos;
 448           do
 449             {
 450               if (!traits_type::eq(this->_M_data()[__size], __c))
 451                 return __size;
 452             }
 453           while (__size--);
 454         }
 455       return npos;
 456     }
 457
 458   template<typename _CharT, typename _Traits, typename _Alloc,
 459            template <typename, typename, typename> class _Base>
 460     int
 461     __versa_string<_CharT, _Traits, _Alloc, _Base>::
 462     compare(size_type __pos, size_type __n, const __versa_string& __str) const
 463     {
 464       _M_check(__pos, "__versa_string::compare");
 465       __n = _M_limit(__pos, __n);
 466       const size_type __osize = __str.size();
 467       const size_type __len = std::min(__n, __osize);
 468       int __r = traits_type::compare(this->_M_data() + __pos,
 469                                      __str.data(), __len);
 470       if (!__r)
 471         __r = this->_S_compare(__n, __osize);
 472       return __r;
 473     }
 474
 475   template<typename _CharT, typename _Traits, typename _Alloc,
 476            template <typename, typename, typename> class _Base>
 477     int
 478     __versa_string<_CharT, _Traits, _Alloc, _Base>::
 479     compare(size_type __pos1, size_type __n1, const __versa_string& __str,
 480             size_type __pos2, size_type __n2) const
 481     {
 482       _M_check(__pos1, "__versa_string::compare");
 483       __str._M_check(__pos2, "__versa_string::compare");
 484       __n1 = _M_limit(__pos1, __n1);
 485       __n2 = __str._M_limit(__pos2, __n2);
 486       const size_type __len = std::min(__n1, __n2);
 487       int __r = traits_type::compare(this->_M_data() + __pos1,
 488                                      __str.data() + __pos2, __len);
 489       if (!__r)
 490         __r = this->_S_compare(__n1, __n2);
 491       return __r;
 492     }
 493
 494   template<typename _CharT, typename _Traits, typename _Alloc,
 495            template <typename, typename, typename> class _Base>
 496     int
 497     __versa_string<_CharT, _Traits, _Alloc, _Base>::
 498     compare(const _CharT* __s) const
 499     {
 500       __glibcxx_requires_string(__s);
 501       const size_type __size = this->size();
 502       const size_type __osize = traits_type::length(__s);
 503       const size_type __len = std::min(__size, __osize);
 504       int __r = traits_type::compare(this->_M_data(), __s, __len);
 505       if (!__r)
 506         __r = this->_S_compare(__size, __osize);
 507       return __r;
 508     }
 509
 510   template<typename _CharT, typename _Traits, typename _Alloc,
 511            template <typename, typename, typename> class _Base>
 512     int
 513     __versa_string <_CharT, _Traits, _Alloc, _Base>::
 514     compare(size_type __pos, size_type __n1, const _CharT* __s) const
 515     {
 516       __glibcxx_requires_string(__s);
 517       _M_check(__pos, "__versa_string::compare");
 518       __n1 = _M_limit(__pos, __n1);
 519       const size_type __osize = traits_type::length(__s);
 520       const size_type __len = std::min(__n1, __osize);
 521       int __r = traits_type::compare(this->_M_data() + __pos, __s, __len);
 522       if (!__r)
 523         __r = this->_S_compare(__n1, __osize);
 524       return __r;
 525     }
 526
 527   template<typename _CharT, typename _Traits, typename _Alloc,
 528            template <typename, typename, typename> class _Base>
 529     int
 530     __versa_string <_CharT, _Traits, _Alloc, _Base>::
 531     compare(size_type __pos, size_type __n1, const _CharT* __s,
 532             size_type __n2) const
 533     {
 534       __glibcxx_requires_string_len(__s, __n2);
 535       _M_check(__pos, "__versa_string::compare");
 536       __n1 = _M_limit(__pos, __n1);
 537       const size_type __len = std::min(__n1, __n2);
 538       int __r = traits_type::compare(this->_M_data() + __pos, __s, __len);
 539       if (!__r)
 540         __r = this->_S_compare(__n1, __n2);
 541       return __r;
 542     }
 543
 544 _GLIBCXX_END_NAMESPACE_VERSION
 545 } // namespace
 546
 547 namespace std _GLIBCXX_VISIBILITY(default)
 548 {
 549 _GLIBCXX_BEGIN_NAMESPACE_VERSION
 550
 551   template<typename _CharT, typename _Traits, typename _Alloc,
 552            template <typename, typename, typename> class _Base>
 553     basic_istream<_CharT, _Traits>&
 554     operator>>(basic_istream<_CharT, _Traits>& __in,
 555                __gnu_cxx::__versa_string<_CharT, _Traits,
 556                                          _Alloc, _Base>& __str)
 557     {
 558       typedef basic_istream<_CharT, _Traits>            __istream_type;
 559       typedef typename __istream_type::ios_base         __ios_base;
 560       typedef __gnu_cxx::__versa_string<_CharT, _Traits, _Alloc, _Base>
 561                                                         __string_type;
 562       typedef typename __istream_type::int_type         __int_type;
 563       typedef typename __string_type::size_type         __size_type;
 564       typedef ctype<_CharT>                             __ctype_type;
 565       typedef typename __ctype_type::ctype_base         __ctype_base;
 566
 567       __size_type __extracted = 0;
 568       typename __ios_base::iostate __err = __ios_base::goodbit;
 569       typename __istream_type::sentry __cerb(__in, false);
 570       if (__cerb)
 571         {
 572           __try
 573             {
 574               // Avoid reallocation for common case.
 575               __str.erase();
 576               _CharT __buf[128];
 577               __size_type __len = 0;
 578               const streamsize __w = __in.width();
 579               const __size_type __n = __w > 0 ? static_cast<__size_type>(__w)
 580                                               : __str.max_size();
 581               const __ctype_type& __ct = use_facet<__ctype_type>(__in.getloc());
 582               const __int_type __eof = _Traits::eof();
 583               __int_type __c = __in.rdbuf()->sgetc();
 584
 585               while (__extracted < __n
 586                      && !_Traits::eq_int_type(__c, __eof)
 587                      && !__ct.is(__ctype_base::space,
 588                                  _Traits::to_char_type(__c)))
 589                 {
 590                   if (__len == sizeof(__buf) / sizeof(_CharT))
 591                     {
 592                       __str.append(__buf, sizeof(__buf) / sizeof(_CharT));
 593                       __len = 0;
 594                     }
 595                   __buf[__len++] = _Traits::to_char_type(__c);
 596                   ++__extracted;
 597                   __c = __in.rdbuf()->snextc();
 598                 }
 599               __str.append(__buf, __len);
 600
 601               if (_Traits::eq_int_type(__c, __eof))
 602                 __err |= __ios_base::eofbit;
 603               __in.width(0);
 604             }
 605           __catch(__cxxabiv1::__forced_unwind&)
 606             {
 607               __in._M_setstate(__ios_base::badbit);
 608               __throw_exception_again;
 609             }
 610           __catch(...)
 611             {
 612               // _GLIBCXX_RESOLVE_LIB_DEFECTS
 613               // 91. Description of operator>> and getline() for string<>
 614               // might cause endless loop
 615               __in._M_setstate(__ios_base::badbit);
 616             }
 617         }
 618       // 211.  operator>>(istream&, string&) doesn't set failbit
 619       if (!__extracted)
 620         __err |= __ios_base::failbit;
 621       if (__err)
 622         __in.setstate(__err);
 623       return __in;
 624     }
 625
 626   template<typename _CharT, typename _Traits, typename _Alloc,
 627            template <typename, typename, typename> class _Base>
 628     basic_istream<_CharT, _Traits>&
 629     getline(basic_istream<_CharT, _Traits>& __in,
 630             __gnu_cxx::__versa_string<_CharT, _Traits, _Alloc, _Base>& __str,
 631             _CharT __delim)
 632     {
 633       typedef basic_istream<_CharT, _Traits>            __istream_type;
 634       typedef typename __istream_type::ios_base         __ios_base;
 635       typedef __gnu_cxx::__versa_string<_CharT, _Traits, _Alloc, _Base>
 636                                                         __string_type;
 637       typedef typename __istream_type::int_type         __int_type;
 638       typedef typename __string_type::size_type         __size_type;
 639
 640       __size_type __extracted = 0;
 641       const __size_type __n = __str.max_size();
 642       typename __ios_base::iostate __err = __ios_base::goodbit;
 643       typename __istream_type::sentry __cerb(__in, true);
 644       if (__cerb)
 645         {
 646           __try
 647             {
 648               // Avoid reallocation for common case.
 649               __str.erase();
 650               _CharT __buf[128];
 651               __size_type __len = 0;
 652               const __int_type __idelim = _Traits::to_int_type(__delim);
 653               const __int_type __eof = _Traits::eof();
 654               __int_type __c = __in.rdbuf()->sgetc();
 655
 656               while (__extracted < __n
 657                      && !_Traits::eq_int_type(__c, __eof)
 658                      && !_Traits::eq_int_type(__c, __idelim))
 659                 {
 660                   if (__len == sizeof(__buf) / sizeof(_CharT))
 661                     {
 662                       __str.append(__buf, sizeof(__buf) / sizeof(_CharT));
 663                       __len = 0;
 664                     }
 665                   __buf[__len++] = _Traits::to_char_type(__c);
 666                   ++__extracted;
 667                   __c = __in.rdbuf()->snextc();
 668                 }
 669               __str.append(__buf, __len);
 670
 671               if (_Traits::eq_int_type(__c, __eof))
 672                 __err |= __ios_base::eofbit;
 673               else if (_Traits::eq_int_type(__c, __idelim))
 674                 {
 675                   ++__extracted;
 676                   __in.rdbuf()->sbumpc();
 677                 }
 678               else
 679                 __err |= __ios_base::failbit;
 680             }
 681           __catch(__cxxabiv1::__forced_unwind&)
 682             {
 683               __in._M_setstate(__ios_base::badbit);
 684               __throw_exception_again;
 685             }
 686           __catch(...)
 687             {
 688               // _GLIBCXX_RESOLVE_LIB_DEFECTS
 689               // 91. Description of operator>> and getline() for string<>
 690               // might cause endless loop
 691               __in._M_setstate(__ios_base::badbit);
 692             }
 693         }
 694       if (!__extracted)
 695         __err |= __ios_base::failbit;
 696       if (__err)
 697         __in.setstate(__err);
 698       return __in;
 699     }
 700
 701 _GLIBCXX_END_NAMESPACE_VERSION
 702 } // namespace
 703
 704 #endif // _VSTRING_TCC