| 1 |
// String based streams -*- 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/sstream.tcc |
| 26 |
* This is an internal header file, included by other library headers. |
| 27 |
* Do not attempt to use it directly. @headername{sstream} |
| 28 |
*/ |
| 29 |
|
| 30 |
// |
| 31 |
// ISO C++ 14882: 27.7 String-based streams |
| 32 |
// |
| 33 |
|
| 34 |
#ifndef _SSTREAM_TCC |
| 35 |
#define _SSTREAM_TCC 1 |
| 36 |
|
| 37 |
#pragma GCC system_header |
| 38 |
|
| 39 |
namespace std _GLIBCXX_VISIBILITY(default) |
| 40 |
{ |
| 41 |
_GLIBCXX_BEGIN_NAMESPACE_VERSION |
| 42 |
|
| 43 |
template <class _CharT, class _Traits, class _Alloc> |
| 44 |
typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type |
| 45 |
basic_stringbuf<_CharT, _Traits, _Alloc>:: |
| 46 |
pbackfail(int_type __c) |
| 47 |
{ |
| 48 |
int_type __ret = traits_type::eof(); |
| 49 |
if (this->eback() < this->gptr()) |
| 50 |
{ |
| 51 |
// Try to put back __c into input sequence in one of three ways. |
| 52 |
// Order these tests done in is unspecified by the standard. |
| 53 |
const bool __testeof = traits_type::eq_int_type(__c, __ret); |
| 54 |
if (!__testeof) |
| 55 |
{ |
| 56 |
const bool __testeq = traits_type::eq(traits_type:: |
| 57 |
to_char_type(__c), |
| 58 |
this->gptr()[-1]); |
| 59 |
const bool __testout = this->_M_mode & ios_base::out; |
| 60 |
if (__testeq || __testout) |
| 61 |
{ |
| 62 |
this->gbump(-1); |
| 63 |
if (!__testeq) |
| 64 |
*this->gptr() = traits_type::to_char_type(__c); |
| 65 |
__ret = __c; |
| 66 |
} |
| 67 |
} |
| 68 |
else |
| 69 |
{ |
| 70 |
this->gbump(-1); |
| 71 |
__ret = traits_type::not_eof(__c); |
| 72 |
} |
| 73 |
} |
| 74 |
return __ret; |
| 75 |
} |
| 76 |
|
| 77 |
template <class _CharT, class _Traits, class _Alloc> |
| 78 |
typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type |
| 79 |
basic_stringbuf<_CharT, _Traits, _Alloc>:: |
| 80 |
overflow(int_type __c) |
| 81 |
{ |
| 82 |
const bool __testout = this->_M_mode & ios_base::out; |
| 83 |
if (__builtin_expect(!__testout, false)) |
| 84 |
return traits_type::eof(); |
| 85 |
|
| 86 |
const bool __testeof = traits_type::eq_int_type(__c, traits_type::eof()); |
| 87 |
if (__builtin_expect(__testeof, false)) |
| 88 |
return traits_type::not_eof(__c); |
| 89 |
|
| 90 |
const __size_type __capacity = _M_string.capacity(); |
| 91 |
|
| 92 |
#if _GLIBCXX_USE_CXX11_ABI |
| 93 |
if (size_t(this->epptr() - this->pbase()) < __capacity) |
| 94 |
{ |
| 95 |
// There is additional capacity in _M_string that can be used. |
| 96 |
char_type* __base = const_cast<char_type*>(_M_string.data()); |
| 97 |
_M_pbump(__base, __base + __capacity, this->pptr() - this->pbase()); |
| 98 |
if (_M_mode & ios_base::in) |
| 99 |
{ |
| 100 |
const __size_type __nget = this->gptr() - this->eback(); |
| 101 |
const __size_type __eget = this->egptr() - this->eback(); |
| 102 |
this->setg(__base, __base + __nget, __base + __eget + 1); |
| 103 |
} |
| 104 |
*this->pptr() = traits_type::to_char_type(__c); |
| 105 |
this->pbump(1); |
| 106 |
return __c; |
| 107 |
} |
| 108 |
#endif |
| 109 |
|
| 110 |
const __size_type __max_size = _M_string.max_size(); |
| 111 |
const bool __testput = this->pptr() < this->epptr(); |
| 112 |
if (__builtin_expect(!__testput && __capacity == __max_size, false)) |
| 113 |
return traits_type::eof(); |
| 114 |
|
| 115 |
// Try to append __c into output sequence in one of two ways. |
| 116 |
// Order these tests done in is unspecified by the standard. |
| 117 |
const char_type __conv = traits_type::to_char_type(__c); |
| 118 |
if (!__testput) |
| 119 |
{ |
| 120 |
// NB: Start ostringstream buffers at 512 chars. This is an |
| 121 |
// experimental value (pronounced "arbitrary" in some of the |
| 122 |
// hipper English-speaking countries), and can be changed to |
| 123 |
// suit particular needs. |
| 124 |
// |
| 125 |
// _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 126 |
// 169. Bad efficiency of overflow() mandated |
| 127 |
// 432. stringbuf::overflow() makes only one write position |
| 128 |
// available |
| 129 |
const __size_type __opt_len = std::max(__size_type(2 * __capacity), |
| 130 |
__size_type(512)); |
| 131 |
const __size_type __len = std::min(__opt_len, __max_size); |
| 132 |
__string_type __tmp(_M_string.get_allocator()); |
| 133 |
__tmp.reserve(__len); |
| 134 |
if (this->pbase()) |
| 135 |
__tmp.assign(this->pbase(), this->epptr() - this->pbase()); |
| 136 |
__tmp.push_back(__conv); |
| 137 |
_M_string.swap(__tmp); |
| 138 |
_M_sync(const_cast<char_type*>(_M_string.data()), |
| 139 |
this->gptr() - this->eback(), this->pptr() - this->pbase()); |
| 140 |
} |
| 141 |
else |
| 142 |
*this->pptr() = __conv; |
| 143 |
this->pbump(1); |
| 144 |
return __c; |
| 145 |
} |
| 146 |
|
| 147 |
template <class _CharT, class _Traits, class _Alloc> |
| 148 |
typename basic_stringbuf<_CharT, _Traits, _Alloc>::int_type |
| 149 |
basic_stringbuf<_CharT, _Traits, _Alloc>:: |
| 150 |
underflow() |
| 151 |
{ |
| 152 |
int_type __ret = traits_type::eof(); |
| 153 |
const bool __testin = this->_M_mode & ios_base::in; |
| 154 |
if (__testin) |
| 155 |
{ |
| 156 |
// Update egptr() to match the actual string end. |
| 157 |
_M_update_egptr(); |
| 158 |
|
| 159 |
if (this->gptr() < this->egptr()) |
| 160 |
__ret = traits_type::to_int_type(*this->gptr()); |
| 161 |
} |
| 162 |
return __ret; |
| 163 |
} |
| 164 |
|
| 165 |
template <class _CharT, class _Traits, class _Alloc> |
| 166 |
typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type |
| 167 |
basic_stringbuf<_CharT, _Traits, _Alloc>:: |
| 168 |
seekoff(off_type __off, ios_base::seekdir __way, ios_base::openmode __mode) |
| 169 |
{ |
| 170 |
pos_type __ret = pos_type(off_type(-1)); |
| 171 |
bool __testin = (ios_base::in & this->_M_mode & __mode) != 0; |
| 172 |
bool __testout = (ios_base::out & this->_M_mode & __mode) != 0; |
| 173 |
const bool __testboth = __testin && __testout && __way != ios_base::cur; |
| 174 |
__testin &= !(__mode & ios_base::out); |
| 175 |
__testout &= !(__mode & ios_base::in); |
| 176 |
|
| 177 |
// _GLIBCXX_RESOLVE_LIB_DEFECTS |
| 178 |
// 453. basic_stringbuf::seekoff need not always fail for an empty stream. |
| 179 |
const char_type* __beg = __testin ? this->eback() : this->pbase(); |
| 180 |
if ((__beg || !__off) && (__testin || __testout || __testboth)) |
| 181 |
{ |
| 182 |
_M_update_egptr(); |
| 183 |
|
| 184 |
off_type __newoffi = __off; |
| 185 |
off_type __newoffo = __newoffi; |
| 186 |
if (__way == ios_base::cur) |
| 187 |
{ |
| 188 |
__newoffi += this->gptr() - __beg; |
| 189 |
__newoffo += this->pptr() - __beg; |
| 190 |
} |
| 191 |
else if (__way == ios_base::end) |
| 192 |
__newoffo = __newoffi += this->egptr() - __beg; |
| 193 |
|
| 194 |
if ((__testin || __testboth) |
| 195 |
&& __newoffi >= 0 |
| 196 |
&& this->egptr() - __beg >= __newoffi) |
| 197 |
{ |
| 198 |
this->setg(this->eback(), this->eback() + __newoffi, |
| 199 |
this->egptr()); |
| 200 |
__ret = pos_type(__newoffi); |
| 201 |
} |
| 202 |
if ((__testout || __testboth) |
| 203 |
&& __newoffo >= 0 |
| 204 |
&& this->egptr() - __beg >= __newoffo) |
| 205 |
{ |
| 206 |
_M_pbump(this->pbase(), this->epptr(), __newoffo); |
| 207 |
__ret = pos_type(__newoffo); |
| 208 |
} |
| 209 |
} |
| 210 |
return __ret; |
| 211 |
} |
| 212 |
|
| 213 |
template <class _CharT, class _Traits, class _Alloc> |
| 214 |
typename basic_stringbuf<_CharT, _Traits, _Alloc>::pos_type |
| 215 |
basic_stringbuf<_CharT, _Traits, _Alloc>:: |
| 216 |
seekpos(pos_type __sp, ios_base::openmode __mode) |
| 217 |
{ |
| 218 |
pos_type __ret = pos_type(off_type(-1)); |
| 219 |
const bool __testin = (ios_base::in & this->_M_mode & __mode) != 0; |
| 220 |
const bool __testout = (ios_base::out & this->_M_mode & __mode) != 0; |
| 221 |
|
| 222 |
const char_type* __beg = __testin ? this->eback() : this->pbase(); |
| 223 |
if ((__beg || !off_type(__sp)) && (__testin || __testout)) |
| 224 |
{ |
| 225 |
_M_update_egptr(); |
| 226 |
|
| 227 |
const off_type __pos(__sp); |
| 228 |
const bool __testpos = (0 <= __pos |
| 229 |
&& __pos <= this->egptr() - __beg); |
| 230 |
if (__testpos) |
| 231 |
{ |
| 232 |
if (__testin) |
| 233 |
this->setg(this->eback(), this->eback() + __pos, |
| 234 |
this->egptr()); |
| 235 |
if (__testout) |
| 236 |
_M_pbump(this->pbase(), this->epptr(), __pos); |
| 237 |
__ret = __sp; |
| 238 |
} |
| 239 |
} |
| 240 |
return __ret; |
| 241 |
} |
| 242 |
|
| 243 |
template <class _CharT, class _Traits, class _Alloc> |
| 244 |
void |
| 245 |
basic_stringbuf<_CharT, _Traits, _Alloc>:: |
| 246 |
_M_sync(char_type* __base, __size_type __i, __size_type __o) |
| 247 |
{ |
| 248 |
const bool __testin = _M_mode & ios_base::in; |
| 249 |
const bool __testout = _M_mode & ios_base::out; |
| 250 |
char_type* __endg = __base + _M_string.size(); |
| 251 |
char_type* __endp = __base + _M_string.capacity(); |
| 252 |
|
| 253 |
if (__base != _M_string.data()) |
| 254 |
{ |
| 255 |
// setbuf: __i == size of buffer area (_M_string.size() == 0). |
| 256 |
__endg += __i; |
| 257 |
__i = 0; |
| 258 |
__endp = __endg; |
| 259 |
} |
| 260 |
|
| 261 |
if (__testin) |
| 262 |
this->setg(__base, __base + __i, __endg); |
| 263 |
if (__testout) |
| 264 |
{ |
| 265 |
_M_pbump(__base, __endp, __o); |
| 266 |
// egptr() always tracks the string end. When !__testin, |
| 267 |
// for the correct functioning of the streambuf inlines |
| 268 |
// the other get area pointers are identical. |
| 269 |
if (!__testin) |
| 270 |
this->setg(__endg, __endg, __endg); |
| 271 |
} |
| 272 |
} |
| 273 |
|
| 274 |
template <class _CharT, class _Traits, class _Alloc> |
| 275 |
void |
| 276 |
basic_stringbuf<_CharT, _Traits, _Alloc>:: |
| 277 |
_M_pbump(char_type* __pbeg, char_type* __pend, off_type __off) |
| 278 |
{ |
| 279 |
this->setp(__pbeg, __pend); |
| 280 |
while (__off > __gnu_cxx::__numeric_traits<int>::__max) |
| 281 |
{ |
| 282 |
this->pbump(__gnu_cxx::__numeric_traits<int>::__max); |
| 283 |
__off -= __gnu_cxx::__numeric_traits<int>::__max; |
| 284 |
} |
| 285 |
this->pbump(__off); |
| 286 |
} |
| 287 |
|
| 288 |
// Inhibit implicit instantiations for required instantiations, |
| 289 |
// which are defined via explicit instantiations elsewhere. |
| 290 |
#if _GLIBCXX_EXTERN_TEMPLATE |
| 291 |
extern template class basic_stringbuf<char>; |
| 292 |
extern template class basic_istringstream<char>; |
| 293 |
extern template class basic_ostringstream<char>; |
| 294 |
extern template class basic_stringstream<char>; |
| 295 |
|
| 296 |
#ifdef _GLIBCXX_USE_WCHAR_T |
| 297 |
extern template class basic_stringbuf<wchar_t>; |
| 298 |
extern template class basic_istringstream<wchar_t>; |
| 299 |
extern template class basic_ostringstream<wchar_t>; |
| 300 |
extern template class basic_stringstream<wchar_t>; |
| 301 |
#endif |
| 302 |
#endif |
| 303 |
|
| 304 |
_GLIBCXX_END_NAMESPACE_VERSION |
| 305 |
} // namespace std |
| 306 |
|
| 307 |
#endif |
