1 // strstream definitions -*- C++ -*- 2 3 // Copyright (C) 2001, 2002, 2003, 2005, 2009, 2010, 2011 4 // Free Software Foundation 5 // 6 // This file is part of the GNU ISO C++ Library. This library is free 7 // software; you can redistribute it and/or modify it under the 8 // terms of the GNU General Public License as published by the 9 // Free Software Foundation; either version 3, or (at your option) 10 // any later version. 11 12 // This library is distributed in the hope that it will be useful, 13 // but WITHOUT ANY WARRANTY; without even the implied warranty of 14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 // GNU General Public License for more details. 16 17 // Under Section 7 of GPL version 3, you are granted additional 18 // permissions described in the GCC Runtime Library Exception, version 19 // 3.1, as published by the Free Software Foundation. 20 21 // You should have received a copy of the GNU General Public License and 22 // a copy of the GCC Runtime Library Exception along with this program; 23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 // <http://www.gnu.org/licenses/>. 25 26 /* 27 * Copyright (c) 1998 28 * Silicon Graphics Computer Systems, Inc. 29 * 30 * Permission to use, copy, modify, distribute and sell this software 31 * and its documentation for any purpose is hereby granted without fee, 32 * provided that the above copyright notice appear in all copies and 33 * that both that copyright notice and this permission notice appear 34 * in supporting documentation. Silicon Graphics makes no 35 * representations about the suitability of this software for any 36 * purpose. It is provided "as is" without express or implied warranty. 37 */ 38 39 // Implementation of the classes in header <strstream>. 40 // WARNING: The classes defined in <strstream> are DEPRECATED. This 41 // header is defined in section D.7.1 of the C++ standard, and it 42 // MAY BE REMOVED in a future standard revision. You should use the 43 // header <sstream> instead. 44 45 #include <strstream> 46 #include <algorithm> 47 #include <new> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <limits.h> 51 52 namespace std _GLIBCXX_VISIBILITY(default) 53 { 54 _GLIBCXX_BEGIN_NAMESPACE_VERSION 55 56 strstreambuf::strstreambuf(streamsize initial_capacity) 57 : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(true), 58 _M_frozen(false), _M_constant(false) 59 { 60 streamsize n = std::max(initial_capacity, streamsize(16)); 61 62 char* buf = _M_alloc(n); 63 if (buf) 64 { 65 setp(buf, buf + n); 66 setg(buf, buf, buf); 67 } 68 } 69 70 strstreambuf::strstreambuf(void* (*alloc_f)(size_t), void (*free_f)(void*)) 71 : _Base(), _M_alloc_fun(alloc_f), _M_free_fun(free_f), _M_dynamic(true), 72 _M_frozen(false), _M_constant(false) 73 { 74 streamsize n = 16; 75 76 char* buf = _M_alloc(n); 77 if (buf) 78 { 79 setp(buf, buf + n); 80 setg(buf, buf, buf); 81 } 82 } 83 84 strstreambuf::strstreambuf(char* get, streamsize n, char* put) throw () 85 : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false), 86 _M_frozen(false), _M_constant(false) 87 { _M_setup(get, put, n); } 88 89 strstreambuf::strstreambuf(signed char* get, streamsize n, signed char* put) throw () 90 : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false), 91 _M_frozen(false), _M_constant(false) 92 { _M_setup(reinterpret_cast<char*>(get), reinterpret_cast<char*>(put), n); } 93 94 strstreambuf::strstreambuf(unsigned char* get, streamsize n, 95 unsigned char* put) throw () 96 : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false), 97 _M_frozen(false), _M_constant(false) 98 { _M_setup(reinterpret_cast<char*>(get), reinterpret_cast<char*>(put), n); } 99 100 strstreambuf::strstreambuf(const char* get, streamsize n) throw () 101 : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false), 102 _M_frozen(false), _M_constant(true) 103 { _M_setup(const_cast<char*>(get), 0, n); } 104 105 strstreambuf::strstreambuf(const signed char* get, streamsize n) throw () 106 : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false), 107 _M_frozen(false), _M_constant(true) 108 { _M_setup(reinterpret_cast<char*>(const_cast<signed char*>(get)), 0, n); } 109 110 strstreambuf::strstreambuf(const unsigned char* get, streamsize n) throw () 111 : _Base(), _M_alloc_fun(0), _M_free_fun(0), _M_dynamic(false), 112 _M_frozen(false), _M_constant(true) 113 { _M_setup(reinterpret_cast<char*>(const_cast<unsigned char*>(get)), 0, n); } 114 115 strstreambuf::~strstreambuf() 116 { 117 if (_M_dynamic && !_M_frozen) 118 _M_free(eback()); 119 } 120 121 void 122 strstreambuf::freeze(bool frozenflag) throw () 123 { 124 if (_M_dynamic) 125 _M_frozen = frozenflag; 126 } 127 128 char* 129 strstreambuf::str() throw () 130 { 131 freeze(true); 132 return eback(); 133 } 134 135 int 136 strstreambuf::pcount() const throw () 137 { return pptr() ? pptr() - pbase() : 0; } 138 139 strstreambuf::int_type 140 strstreambuf::overflow(int_type c) 141 { 142 if (c == traits_type::eof()) 143 return traits_type::not_eof(c); 144 145 // Try to expand the buffer. 146 if (pptr() == epptr() && _M_dynamic && !_M_frozen && !_M_constant) 147 { 148 ptrdiff_t old_size = epptr() - pbase(); 149 ptrdiff_t new_size = std::max(ptrdiff_t(2 * old_size), ptrdiff_t(1)); 150 151 char* buf = _M_alloc(new_size); 152 if (buf) 153 { 154 memcpy(buf, pbase(), old_size); 155 char* old_buffer = pbase(); 156 bool reposition_get = false; 157 ptrdiff_t old_get_offset; 158 if (gptr() != 0) 159 { 160 reposition_get = true; 161 old_get_offset = gptr() - eback(); 162 } 163 164 setp(buf, buf + new_size); 165 __safe_pbump(old_size); 166 167 if (reposition_get) 168 setg(buf, buf + old_get_offset, buf + 169 std::max(old_get_offset, old_size)); 170 171 _M_free(old_buffer); 172 } 173 } 174 175 if (pptr() != epptr()) 176 { 177 *pptr() = c; 178 pbump(1); 179 return c; 180 } 181 else 182 return traits_type::eof(); 183 } 184 185 strstreambuf::int_type 186 strstreambuf::pbackfail(int_type c) 187 { 188 if (gptr() != eback()) 189 { 190 if (c == _Traits::eof()) 191 { 192 gbump(-1); 193 return _Traits::not_eof(c); 194 } 195 else if (c == _Traits::to_int_type(gptr()[-1])) 196 { // KLUDGE 197 gbump(-1); 198 return c; 199 } 200 else if (!_M_constant) 201 { 202 gbump(-1); 203 *gptr() = c; 204 return c; 205 } 206 } 207 return _Traits::eof(); 208 } 209 210 strstreambuf::int_type 211 strstreambuf::underflow() 212 { 213 if (gptr() == egptr() && pptr() && pptr() > egptr()) 214 setg(eback(), gptr(), pptr()); 215 216 if (gptr() != egptr()) 217 return (unsigned char) *gptr(); 218 else 219 return _Traits::eof(); 220 } 221 222 basic_streambuf<char, char_traits<char> >* 223 strstreambuf::setbuf(char*, streamsize) 224 { return this; } 225 226 strstreambuf::pos_type 227 strstreambuf::seekoff(off_type off, ios_base::seekdir dir, 228 ios_base::openmode mode) 229 { 230 bool do_get = false; 231 bool do_put = false; 232 233 if ((mode & (ios_base::in | ios_base::out)) 234 == (ios_base::in | ios_base::out) && 235 (dir == ios_base::beg || dir == ios_base::end)) 236 do_get = do_put = true; 237 else if (mode & ios_base::in) 238 do_get = true; 239 else if (mode & ios_base::out) 240 do_put = true; 241 242 // !gptr() is here because, according to D.7.1 paragraph 4, the seekable 243 // area is undefined if there is no get area. 244 if ((!do_get && !do_put) || (do_put && !pptr()) || !gptr()) 245 return pos_type(off_type(-1)); 246 247 char* seeklow = eback(); 248 char* seekhigh = epptr() ? epptr() : egptr(); 249 250 off_type newoff; 251 switch (dir) 252 { 253 case ios_base::beg: 254 newoff = 0; 255 break; 256 case ios_base::end: 257 newoff = seekhigh - seeklow; 258 break; 259 case ios_base::cur: 260 newoff = do_put ? pptr() - seeklow : gptr() - seeklow; 261 break; 262 default: 263 return pos_type(off_type(-1)); 264 } 265 266 off += newoff; 267 if (off < 0 || off > seekhigh - seeklow) 268 return pos_type(off_type(-1)); 269 270 if (do_put) 271 { 272 if (seeklow + off < pbase()) 273 { 274 setp(seeklow, epptr()); 275 __safe_pbump(off); 276 } 277 else 278 { 279 setp(pbase(), epptr()); 280 __safe_pbump(off - (pbase() - seeklow)); 281 } 282 } 283 if (do_get) 284 { 285 if (off <= egptr() - seeklow) 286 setg(seeklow, seeklow + off, egptr()); 287 else if (off <= pptr() - seeklow) 288 setg(seeklow, seeklow + off, pptr()); 289 else 290 setg(seeklow, seeklow + off, epptr()); 291 } 292 return pos_type(newoff); 293 } 294 295 strstreambuf::pos_type 296 strstreambuf::seekpos(pos_type pos, ios_base::openmode mode) 297 { return seekoff(pos - pos_type(off_type(0)), ios_base::beg, mode); } 298 299 char* 300 strstreambuf::_M_alloc(size_t n) 301 { 302 if (_M_alloc_fun) 303 return static_cast<char*>(_M_alloc_fun(n)); 304 else 305 return new char[n]; 306 } 307 308 void 309 strstreambuf::_M_free(char* p) 310 { 311 if (p) 312 { 313 if (_M_free_fun) 314 _M_free_fun(p); 315 else 316 delete[] p; 317 } 318 } 319 320 void 321 strstreambuf::_M_setup(char* get, char* put, streamsize n) throw () 322 { 323 if (get) 324 { 325 size_t N = n > 0 ? size_t(n) : n == 0 ? strlen(get) : size_t(INT_MAX); 326 327 if (put) 328 { 329 setg(get, get, put); 330 setp(put, put + N); 331 } 332 else 333 setg(get, get, get + N); 334 } 335 } 336 337 istrstream::istrstream(char* s) 338 : basic_ios<char>(), basic_istream<char>(0), _M_buf(s, 0) 339 { basic_ios<char>::init(&_M_buf); } 340 341 istrstream::istrstream(const char* s) 342 : basic_ios<char>(), basic_istream<char>(0), _M_buf(s, 0) 343 { basic_ios<char>::init(&_M_buf); } 344 345 istrstream::istrstream(char* s, streamsize n) 346 : basic_ios<char>(), basic_istream<char>(0), _M_buf(s, n) 347 { basic_ios<char>::init(&_M_buf); } 348 349 istrstream::istrstream(const char* s, streamsize n) 350 : basic_ios<char>(), basic_istream<char>(0), _M_buf(s, n) 351 { basic_ios<char>::init(&_M_buf); } 352 353 istrstream::~istrstream() { } 354 355 strstreambuf* 356 istrstream::rdbuf() const throw () 357 { return const_cast<strstreambuf*>(&_M_buf); } 358 359 char* 360 istrstream::str() throw () 361 { return _M_buf.str(); } 362 363 ostrstream::ostrstream() 364 : basic_ios<char>(), basic_ostream<char>(0), _M_buf() 365 { basic_ios<char>::init(&_M_buf); } 366 367 ostrstream::ostrstream(char* s, int n, ios_base::openmode mode) 368 : basic_ios<char>(), basic_ostream<char>(0), 369 _M_buf(s, n, mode & ios_base::app ? s + strlen(s) : s) 370 { basic_ios<char>::init(&_M_buf); } 371 372 ostrstream::~ostrstream() {} 373 374 strstreambuf* 375 ostrstream::rdbuf() const throw () 376 { return const_cast<strstreambuf*>(&_M_buf); } 377 378 void 379 ostrstream::freeze(bool freezeflag) throw () 380 { _M_buf.freeze(freezeflag); } 381 382 char* 383 ostrstream::str() throw () 384 { return _M_buf.str(); } 385 386 int 387 ostrstream::pcount() const throw () 388 { return _M_buf.pcount(); } 389 390 strstream::strstream() 391 : basic_ios<char>(), basic_iostream<char>(0), _M_buf() 392 { basic_ios<char>::init(&_M_buf); } 393 394 strstream::strstream(char* s, int n, ios_base::openmode mode) 395 : basic_ios<char>(), basic_iostream<char>(0), 396 _M_buf(s, n, mode & ios_base::app ? s + strlen(s) : s) 397 { basic_ios<char>::init(&_M_buf); } 398 399 strstream::~strstream() { } 400 401 strstreambuf* 402 strstream::rdbuf() const throw () 403 { return const_cast<strstreambuf*>(&_M_buf); } 404 405 void 406 strstream::freeze(bool freezeflag) throw () 407 { _M_buf.freeze(freezeflag); } 408 409 int 410 strstream::pcount() const throw () 411 { return _M_buf.pcount(); } 412 413 char* 414 strstream::str() throw () 415 { return _M_buf.str(); } 416 417 _GLIBCXX_END_NAMESPACE_VERSION 418 } // namespace 419