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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 | // File based streams -*- C++ -*-
// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003
// Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
//
// ISO C++ 14882: 27.8 File-based streams
//
/** @file fstream
* This is a Standard C++ Library header. You should @c #include this header
* in your programs, rather than any of the "st[dl]_*.h" implementation files.
*/
#ifndef _CPP_FSTREAM
#define _CPP_FSTREAM 1
#pragma GCC system_header
#include <istream>
#include <ostream>
#include <locale> // For codecvt
#include <bits/basic_file.h>
#include <bits/gthr.h>
namespace std
{
template<typename _CharT, typename _Traits>
class basic_filebuf : public basic_streambuf<_CharT, _Traits>
{
public:
// Types:
typedef _CharT char_type;
typedef _Traits traits_type;
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
// Non-standard Types:
typedef basic_streambuf<char_type, traits_type> __streambuf_type;
typedef basic_filebuf<char_type, traits_type> __filebuf_type;
typedef __basic_file<char> __file_type;
typedef typename traits_type::state_type __state_type;
typedef codecvt<char_type, char, __state_type> __codecvt_type;
typedef typename __codecvt_type::result __res_type;
typedef ctype<char_type> __ctype_type;
friend class ios_base; // For sync_with_stdio.
protected:
// Data Members:
// MT lock inherited from libio or other low-level io library.
__c_lock _M_lock;
// External buffer.
__file_type _M_file;
// Current and beginning state type for codecvt.
__state_type _M_state_cur;
__state_type _M_state_beg;
// Set iff _M_buf is allocated memory from _M_allocate_internal_buffer.
bool _M_buf_allocated;
// XXX Needed?
bool _M_last_overflowed;
// The position in the buffer corresponding to the external file
// pointer.
char_type* _M_filepos;
public:
// Constructors/destructor:
basic_filebuf();
virtual
~basic_filebuf()
{
this->close();
_M_last_overflowed = false;
}
// Members:
bool
is_open() const { return _M_file.is_open(); }
__filebuf_type*
open(const char* __s, ios_base::openmode __mode);
__filebuf_type*
close();
protected:
void
_M_allocate_internal_buffer();
void
_M_destroy_internal_buffer();
// Overridden virtual functions:
virtual streamsize
showmanyc();
// Stroustrup, 1998, p. 628
// underflow() and uflow() functions are called to get the next
// charater from the real input source when the buffer is empty.
// Buffered input uses underflow()
// The only difference between underflow() and uflow() is that the
// latter bumps _M_in_cur after the read. In the sync_with_stdio
// case, this is important, as we need to unget the read character in
// the underflow() case in order to maintain synchronization. So
// instead of calling underflow() from uflow(), we create a common
// subroutine to do the real work.
int_type
_M_underflow_common(bool __bump);
virtual int_type
underflow();
virtual int_type
uflow();
virtual int_type
pbackfail(int_type __c = _Traits::eof());
// NB: For what the standard expects of the overflow function,
// see _M_really_overflow(), below. Because basic_streambuf's
// sputc/sputn call overflow directly, and the complications of
// this implementation's setting of the initial pointers all
// equal to _M_buf when initializing, it seems essential to have
// this in actuality be a helper function that checks for the
// eccentricities of this implementation, and then call
// overflow() if indeed the buffer is full.
virtual int_type
overflow(int_type __c = _Traits::eof());
// Stroustrup, 1998, p 648
// The overflow() function is called to transfer characters to the
// real output destination when the buffer is full. A call to
// overflow(c) outputs the contents of the buffer plus the
// character c.
// 27.5.2.4.5
// Consume some sequence of the characters in the pending sequence.
int_type
_M_really_overflow(int_type __c = _Traits::eof());
// Convert internal byte sequence to external, char-based
// sequence via codecvt.
void
_M_convert_to_external(char_type*, streamsize, streamsize&, streamsize&);
virtual __streambuf_type*
setbuf(char_type* __s, streamsize __n);
virtual pos_type
seekoff(off_type __off, ios_base::seekdir __way,
ios_base::openmode __mode = ios_base::in | ios_base::out);
virtual pos_type
seekpos(pos_type __pos,
ios_base::openmode __mode = ios_base::in | ios_base::out);
virtual int
sync()
{
bool __testput = this->_M_out_cur && this->_M_out_beg < this->_M_out_end;
// Make sure that the internal buffer resyncs its idea of
// the file position with the external file.
if (__testput)
{
// Need to restore current position after the write.
off_type __off = this->_M_out_cur - this->_M_out_end;
_M_really_overflow(); // _M_file.sync() will be called within
if (__off)
_M_file.seekoff(__off, ios_base::cur);
}
else
_M_file.sync();
_M_last_overflowed = false;
return 0;
}
virtual void
imbue(const locale& __loc);
virtual streamsize
xsgetn(char_type* __s, streamsize __n)
{
streamsize __ret = 0;
// Clear out pback buffer before going on to the real deal...
if (this->_M_pback_init)
{
while (__ret < __n && this->_M_in_cur < this->_M_in_end)
{
*__s = *this->_M_in_cur;
++__ret;
++__s;
++this->_M_in_cur;
}
this->_M_pback_destroy();
}
if (__ret < __n)
__ret += __streambuf_type::xsgetn(__s, __n - __ret);
return __ret;
}
virtual streamsize
xsputn(const char_type* __s, streamsize __n)
{
this->_M_pback_destroy();
return __streambuf_type::xsputn(__s, __n);
}
void
_M_output_unshift();
// These three functions are used to clarify internal buffer
// maintenance. After an overflow, or after a seekoff call that
// started at beg or end, or possibly when the stream becomes
// unbuffered, and a myrid other obscure corner cases, the
// internal buffer does not truly reflect the contents of the
// external buffer. At this point, for whatever reason, it is in
// an indeterminate state.
void
_M_set_indeterminate(void)
{
if (this->_M_mode & ios_base::in)
this->setg(this->_M_buf, this->_M_buf, this->_M_buf);
if (this->_M_mode & ios_base::out)
this->setp(this->_M_buf, this->_M_buf);
this->_M_filepos = this->_M_buf;
}
void
_M_set_determinate(off_type __off)
{
bool __testin = this->_M_mode & ios_base::in;
bool __testout = this->_M_mode & ios_base::out;
if (__testin)
this->setg(this->_M_buf, this->_M_buf, this->_M_buf + __off);
if (__testout)
this->setp(this->_M_buf, this->_M_buf + __off);
this->_M_filepos = this->_M_buf + __off;
}
bool
_M_is_indeterminate(void)
{
bool __ret = false;
// Don't return true if unbuffered.
if (this->_M_buf)
{
if (this->_M_mode & ios_base::in)
__ret = this->_M_in_beg == this->_M_in_cur && this->_M_in_cur == this->_M_in_end;
if (this->_M_mode & ios_base::out)
__ret = this->_M_out_beg == this->_M_out_cur && this->_M_out_cur == this->_M_out_end;
}
return __ret;
}
};
// Explicit specializations.
template<>
basic_filebuf<char>::int_type
basic_filebuf<char>::_M_underflow_common(bool __bump);
#ifdef _GLIBCPP_USE_WCHAR_T
template<>
basic_filebuf<wchar_t>::int_type
basic_filebuf<wchar_t>::_M_underflow_common(bool __bump);
#endif
// Generic definitions.
template <typename _CharT, typename _Traits>
typename basic_filebuf<_CharT, _Traits>::int_type
basic_filebuf<_CharT, _Traits>::underflow()
{ return _M_underflow_common(false); }
template <typename _CharT, typename _Traits>
typename basic_filebuf<_CharT, _Traits>::int_type
basic_filebuf<_CharT, _Traits>::uflow()
{ return _M_underflow_common(true); }
// 27.8.1.5 Template class basic_ifstream
/**
* Derivation of general input streams, specific to files.
*/
template<typename _CharT, typename _Traits>
class basic_ifstream : public basic_istream<_CharT, _Traits>
{
public:
// Types:
typedef _CharT char_type;
typedef _Traits traits_type;
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
// Non-standard types:
typedef basic_filebuf<char_type, traits_type> __filebuf_type;
typedef basic_istream<char_type, traits_type> __istream_type;
private:
__filebuf_type _M_filebuf;
public:
// Constructors/Destructors:
/** Default constructor. Create an input file stream. */
basic_ifstream()
: __istream_type(NULL), _M_filebuf()
{ this->init(&_M_filebuf); }
/**
* @brief Create an input file stream.
* @param s Null terminated string specifying filename.
* @param mode Open file in specified mode (see std::ios_base).
*
* Tip: When using std::string to hold the filename, you must use
* .c_str() before passing it to this constructor.
*/
explicit
basic_ifstream(const char* __s, ios_base::openmode __mode = ios_base::in)
: __istream_type(NULL), _M_filebuf()
{
this->init(&_M_filebuf);
this->open(__s, __mode);
}
~basic_ifstream()
{ }
// Members:
/**
* @brief Get a pointer to the file stream's buffer.
* @return Pointer to basic_filebuf.
*/
__filebuf_type*
rdbuf() const
{ return const_cast<__filebuf_type*>(&_M_filebuf); }
bool
is_open() { return _M_filebuf.is_open(); }
void
open(const char* __s, ios_base::openmode __mode = ios_base::in)
{
if (!_M_filebuf.open(__s, __mode | ios_base::in))
this->setstate(ios_base::failbit);
}
/** Close the file. */
void
close()
{
if (!_M_filebuf.close())
this->setstate(ios_base::failbit);
}
};
// 27.8.1.8 Template class basic_ofstream
/**
* Derivation of general output streams, specific to files.
*/
template<typename _CharT, typename _Traits>
class basic_ofstream : public basic_ostream<_CharT,_Traits>
{
public:
// Types:
typedef _CharT char_type;
typedef _Traits traits_type;
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
// Non-standard types:
typedef basic_filebuf<char_type, traits_type> __filebuf_type;
typedef basic_ostream<char_type, traits_type> __ostream_type;
private:
__filebuf_type _M_filebuf;
public:
// Constructors:
/** Default constructor for output file_stream. */
basic_ofstream()
: __ostream_type(NULL), _M_filebuf()
{ this->init(&_M_filebuf); }
/**
* @brief Create an output stream.
* @param s Null terminated string specifying filename.
* @param mode Open file in specified mode (see std::ios_base).
*
* Tip: When using std::string to hold the filename, you must use
* .c_str() before passing it to this constructor.
*/
explicit
basic_ofstream(const char* __s,
ios_base::openmode __mode = ios_base::out|ios_base::trunc)
: __ostream_type(NULL), _M_filebuf()
{
this->init(&_M_filebuf);
this->open(__s, __mode);
}
~basic_ofstream()
{ }
// Members:
/**
* @brief Get a pointer to the file stream's buffer.
* @return Pointer to basic_filebuf.
*/
__filebuf_type*
rdbuf() const
{ return const_cast<__filebuf_type*>(&_M_filebuf); }
/**
* @brief Query to see if file stream is open.
* @return True if stream is open.
*/
bool
is_open() { return _M_filebuf.is_open(); }
/**
* @brief Specify a file to open for output.
* @param s Null terminated string specifying filename.
* @param mode Mode in which to open file (see std::ios_base).
*
* Tip: When using std::string to hold the filename, you must use
* .c_str() before passing it to this constructor.
*/
void
open(const char* __s,
ios_base::openmode __mode = ios_base::out | ios_base::trunc)
{
if (!_M_filebuf.open(__s, __mode | ios_base::out))
this->setstate(ios_base::failbit);
}
/** Close the file stream. */
void
close()
{
if (!_M_filebuf.close())
this->setstate(ios_base::failbit);
}
};
// 27.8.1.11 Template class basic_fstream
/**
* Derivation of general input/output streams, specific to files.
*/
template<typename _CharT, typename _Traits>
class basic_fstream : public basic_iostream<_CharT, _Traits>
{
public:
// Types:
typedef _CharT char_type;
typedef _Traits traits_type;
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
// Non-standard types:
typedef basic_filebuf<char_type, traits_type> __filebuf_type;
typedef basic_ios<char_type, traits_type> __ios_type;
typedef basic_iostream<char_type, traits_type> __iostream_type;
private:
__filebuf_type _M_filebuf;
public:
// Constructors/destructor:
/** Default constructor. Create a file stream. */
basic_fstream()
: __iostream_type(NULL), _M_filebuf()
{ this->init(&_M_filebuf); }
/**
* @brief Create an input/output stream.
* @param s Null terminated string specifying filename.
* @param mode Open file in specified mode (see std::ios_base).
*
* Tip: When using std::string to hold the filename, you must use
* .c_str() before passing it to this constructor.
*/
explicit
basic_fstream(const char* __s,
ios_base::openmode __mode = ios_base::in | ios_base::out)
: __iostream_type(NULL), _M_filebuf()
{
this->init(&_M_filebuf);
this->open(__s, __mode);
}
~basic_fstream()
{ }
// Members:
/**
* @brief Get a pointer to the file stream's buffer.
* @return Pointer to basic_filebuf.
*/
__filebuf_type*
rdbuf() const
{ return const_cast<__filebuf_type*>(&_M_filebuf); }
/**
* @brief Query to see if file stream is open.
* @return True if stream is open.
*/
bool
is_open() { return _M_filebuf.is_open(); }
/**
* @brief Specify a file to open for input and/or output.
* @param s Null terminated string specifying filename.
* @param mode Mode in which to open file (see std::ios_base).
*
* Tip: When using std::string to hold the filename, you must use
* .c_str() before passing it to this constructor.
*/
void
open(const char* __s,
ios_base::openmode __mode = ios_base::in | ios_base::out)
{
if (!_M_filebuf.open(__s, __mode))
this->setstate(ios_base::failbit);
}
/** Close the file stream. */
void
close()
{
if (!_M_filebuf.close())
this->setstate(ios_base::failbit);
}
};
} // namespace std
#ifdef _GLIBCPP_NO_TEMPLATE_EXPORT
# define export
#endif
#ifdef _GLIBCPP_FULLY_COMPLIANT_HEADERS
# include <bits/fstream.tcc>
#endif
#endif
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