Training courses

Kernel and Embedded Linux

Bootlin training courses

Embedded Linux, kernel,
Yocto Project, Buildroot, real-time,
graphics, boot time, debugging...

Bootlin logo

Elixir Cross Referencer

  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
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
// wstring_convert implementation -*- C++ -*-

// Copyright (C) 2015-2020 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 3, 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.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
// <http://www.gnu.org/licenses/>.

/** @file bits/locale_conv.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{locale}
 */

#ifndef _LOCALE_CONV_H
#define _LOCALE_CONV_H 1

#if __cplusplus < 201103L
# include <bits/c++0x_warning.h>
#else

#include <streambuf>
#include <bits/stringfwd.h>
#include <bits/allocator.h>
#include <bits/codecvt.h>
#include <bits/unique_ptr.h>

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

  /**
   * @addtogroup locales
   * @{
   */

  template<typename _OutStr, typename _InChar, typename _Codecvt,
	   typename _State, typename _Fn>
    bool
    __do_str_codecvt(const _InChar* __first, const _InChar* __last,
		     _OutStr& __outstr, const _Codecvt& __cvt, _State& __state,
		     size_t& __count, _Fn __fn)
    {
      if (__first == __last)
	{
	  __outstr.clear();
	  __count = 0;
	  return true;
	}

      size_t __outchars = 0;
      auto __next = __first;
      const auto __maxlen = __cvt.max_length() + 1;

      codecvt_base::result __result;
      do
	{
	  __outstr.resize(__outstr.size() + (__last - __next) * __maxlen);
	  auto __outnext = &__outstr.front() + __outchars;
	  auto const __outlast = &__outstr.back() + 1;
	  __result = (__cvt.*__fn)(__state, __next, __last, __next,
					__outnext, __outlast, __outnext);
	  __outchars = __outnext - &__outstr.front();
	}
      while (__result == codecvt_base::partial && __next != __last
	     && ptrdiff_t(__outstr.size() - __outchars) < __maxlen);

      if (__result == codecvt_base::error)
	{
	  __count = __next - __first;
	  return false;
	}

      // The codecvt facet will only return noconv when the types are
      // the same, so avoid instantiating basic_string::assign otherwise
      if _GLIBCXX17_CONSTEXPR (is_same<typename _Codecvt::intern_type,
				       typename _Codecvt::extern_type>())
	if (__result == codecvt_base::noconv)
	  {
	    __outstr.assign(__first, __last);
	    __count = __last - __first;
	    return true;
	  }

      __outstr.resize(__outchars);
      __count = __next - __first;
      return true;
    }

  // Convert narrow character string to wide.
  template<typename _CharT, typename _Traits, typename _Alloc, typename _State>
    inline bool
    __str_codecvt_in(const char* __first, const char* __last,
		     basic_string<_CharT, _Traits, _Alloc>& __outstr,
		     const codecvt<_CharT, char, _State>& __cvt,
		     _State& __state, size_t& __count)
    {
      using _Codecvt = codecvt<_CharT, char, _State>;
      using _ConvFn
	= codecvt_base::result
	  (_Codecvt::*)(_State&, const char*, const char*, const char*&,
			_CharT*, _CharT*, _CharT*&) const;
      _ConvFn __fn = &codecvt<_CharT, char, _State>::in;
      return __do_str_codecvt(__first, __last, __outstr, __cvt, __state,
			      __count, __fn);
    }

  // As above, but with no __count parameter
  template<typename _CharT, typename _Traits, typename _Alloc, typename _State>
    inline bool
    __str_codecvt_in(const char* __first, const char* __last,
		     basic_string<_CharT, _Traits, _Alloc>& __outstr,
		     const codecvt<_CharT, char, _State>& __cvt)
    {
      _State __state = {};
      size_t __n;
      return __str_codecvt_in(__first, __last, __outstr, __cvt, __state, __n);
    }

  // As above, but returns false for partial conversion
  template<typename _CharT, typename _Traits, typename _Alloc, typename _State>
    inline bool
    __str_codecvt_in_all(const char* __first, const char* __last,
			 basic_string<_CharT, _Traits, _Alloc>& __outstr,
			 const codecvt<_CharT, char, _State>& __cvt)
    {
      _State __state = {};
      size_t __n;
      return __str_codecvt_in(__first, __last, __outstr, __cvt, __state, __n)
	&& (__n == size_t(__last - __first));
    }

  // Convert wide character string to narrow.
  template<typename _CharT, typename _Traits, typename _Alloc, typename _State>
    inline bool
    __str_codecvt_out(const _CharT* __first, const _CharT* __last,
		      basic_string<char, _Traits, _Alloc>& __outstr,
		      const codecvt<_CharT, char, _State>& __cvt,
		      _State& __state, size_t& __count)
    {
      using _Codecvt = codecvt<_CharT, char, _State>;
      using _ConvFn
	= codecvt_base::result
	  (_Codecvt::*)(_State&, const _CharT*, const _CharT*, const _CharT*&,
			char*, char*, char*&) const;
      _ConvFn __fn = &codecvt<_CharT, char, _State>::out;
      return __do_str_codecvt(__first, __last, __outstr, __cvt, __state,
			      __count, __fn);
    }

  // As above, but with no __count parameter
  template<typename _CharT, typename _Traits, typename _Alloc, typename _State>
    inline bool
    __str_codecvt_out(const _CharT* __first, const _CharT* __last,
		      basic_string<char, _Traits, _Alloc>& __outstr,
		      const codecvt<_CharT, char, _State>& __cvt)
    {
      _State __state = {};
      size_t __n;
      return __str_codecvt_out(__first, __last, __outstr, __cvt, __state, __n);
    }

  // As above, but returns false for partial conversions
  template<typename _CharT, typename _Traits, typename _Alloc, typename _State>
    inline bool
    __str_codecvt_out_all(const _CharT* __first, const _CharT* __last,
			  basic_string<char, _Traits, _Alloc>& __outstr,
			  const codecvt<_CharT, char, _State>& __cvt)
    {
      _State __state = {};
      size_t __n;
      return __str_codecvt_out(__first, __last, __outstr, __cvt, __state, __n)
	&& (__n == size_t(__last - __first));
    }

#ifdef _GLIBCXX_USE_CHAR8_T

  // Convert wide character string to narrow.
  template<typename _CharT, typename _Traits, typename _Alloc, typename _State>
    inline bool
    __str_codecvt_out(const _CharT* __first, const _CharT* __last,
		      basic_string<char8_t, _Traits, _Alloc>& __outstr,
		      const codecvt<_CharT, char8_t, _State>& __cvt,
		      _State& __state, size_t& __count)
    {
      using _Codecvt = codecvt<_CharT, char8_t, _State>;
      using _ConvFn
	= codecvt_base::result
	  (_Codecvt::*)(_State&, const _CharT*, const _CharT*, const _CharT*&,
			char8_t*, char8_t*, char8_t*&) const;
      _ConvFn __fn = &codecvt<_CharT, char8_t, _State>::out;
      return __do_str_codecvt(__first, __last, __outstr, __cvt, __state,
			      __count, __fn);
    }

  template<typename _CharT, typename _Traits, typename _Alloc, typename _State>
    inline bool
    __str_codecvt_out(const _CharT* __first, const _CharT* __last,
		      basic_string<char8_t, _Traits, _Alloc>& __outstr,
		      const codecvt<_CharT, char8_t, _State>& __cvt)
    {
      _State __state = {};
      size_t __n;
      return __str_codecvt_out(__first, __last, __outstr, __cvt, __state, __n);
    }

#endif  // _GLIBCXX_USE_CHAR8_T

#ifdef _GLIBCXX_USE_WCHAR_T

_GLIBCXX_BEGIN_NAMESPACE_CXX11

  /// String conversions
  template<typename _Codecvt, typename _Elem = wchar_t,
	   typename _Wide_alloc = allocator<_Elem>,
	   typename _Byte_alloc = allocator<char>>
    class wstring_convert
    {
    public:
      typedef basic_string<char, char_traits<char>, _Byte_alloc>   byte_string;
      typedef basic_string<_Elem, char_traits<_Elem>, _Wide_alloc> wide_string;
      typedef typename _Codecvt::state_type 			   state_type;
      typedef typename wide_string::traits_type::int_type	   int_type;

      /// Default constructor.
      wstring_convert() : _M_cvt(new _Codecvt()) { }

      /** Constructor.
       *
       * @param  __pcvt The facet to use for conversions.
       *
       * Takes ownership of @p __pcvt and will delete it in the destructor.
       */
      explicit
      wstring_convert(_Codecvt* __pcvt) : _M_cvt(__pcvt)
      {
	if (!_M_cvt)
	  __throw_logic_error("wstring_convert");
      }

      /** Construct with an initial converstion state.
       *
       * @param  __pcvt The facet to use for conversions.
       * @param  __state Initial conversion state.
       *
       * Takes ownership of @p __pcvt and will delete it in the destructor.
       * The object's conversion state will persist between conversions.
       */
      wstring_convert(_Codecvt* __pcvt, state_type __state)
      : _M_cvt(__pcvt), _M_state(__state), _M_with_cvtstate(true)
      {
	if (!_M_cvt)
	  __throw_logic_error("wstring_convert");
      }

      /** Construct with error strings.
       *
       * @param  __byte_err A string to return on failed conversions.
       * @param  __wide_err A wide string to return on failed conversions.
       */
      explicit
      wstring_convert(const byte_string& __byte_err,
		      const wide_string& __wide_err = wide_string())
      : _M_cvt(new _Codecvt),
	_M_byte_err_string(__byte_err), _M_wide_err_string(__wide_err),
	_M_with_strings(true)
      {
	if (!_M_cvt)
	  __throw_logic_error("wstring_convert");
      }

      ~wstring_convert() = default;

      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 2176. Special members for wstring_convert and wbuffer_convert
      wstring_convert(const wstring_convert&) = delete;
      wstring_convert& operator=(const wstring_convert&) = delete;

      /// @{ Convert from bytes.
      wide_string
      from_bytes(char __byte)
      {
	char __bytes[2] = { __byte };
	return from_bytes(__bytes, __bytes+1);
      }

      wide_string
      from_bytes(const char* __ptr)
      { return from_bytes(__ptr, __ptr+char_traits<char>::length(__ptr)); }

      wide_string
      from_bytes(const byte_string& __str)
      {
	auto __ptr = __str.data();
	return from_bytes(__ptr, __ptr + __str.size());
      }

      wide_string
      from_bytes(const char* __first, const char* __last)
      {
	if (!_M_with_cvtstate)
	  _M_state = state_type();
	wide_string __out{ _M_wide_err_string.get_allocator() };
	if (__str_codecvt_in(__first, __last, __out, *_M_cvt, _M_state,
			     _M_count))
	  return __out;
	if (_M_with_strings)
	  return _M_wide_err_string;
	__throw_range_error("wstring_convert::from_bytes");
      }
      /// @}

      /// @{ Convert to bytes.
      byte_string
      to_bytes(_Elem __wchar)
      {
	_Elem __wchars[2] = { __wchar };
	return to_bytes(__wchars, __wchars+1);
      }

      byte_string
      to_bytes(const _Elem* __ptr)
      {
	return to_bytes(__ptr, __ptr+wide_string::traits_type::length(__ptr));
      }

      byte_string
      to_bytes(const wide_string& __wstr)
      {
	auto __ptr = __wstr.data();
	return to_bytes(__ptr, __ptr + __wstr.size());
      }

      byte_string
      to_bytes(const _Elem* __first, const _Elem* __last)
      {
	if (!_M_with_cvtstate)
	  _M_state = state_type();
	byte_string __out{ _M_byte_err_string.get_allocator() };
	if (__str_codecvt_out(__first, __last, __out, *_M_cvt, _M_state,
			      _M_count))
	  return __out;
	if (_M_with_strings)
	  return _M_byte_err_string;
	__throw_range_error("wstring_convert::to_bytes");
      }
      /// @}

      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 2174. wstring_convert::converted() should be noexcept
      /// The number of elements successfully converted in the last conversion.
      size_t converted() const noexcept { return _M_count; }

      /// The final conversion state of the last conversion.
      state_type state() const { return _M_state; }

    private:
      unique_ptr<_Codecvt>	_M_cvt;
      byte_string		_M_byte_err_string;
      wide_string		_M_wide_err_string;
      state_type		_M_state = state_type();
      size_t			_M_count = 0;
      bool			_M_with_cvtstate = false;
      bool			_M_with_strings = false;
    };

_GLIBCXX_END_NAMESPACE_CXX11

  /// Buffer conversions
  template<typename _Codecvt, typename _Elem = wchar_t,
	   typename _Tr = char_traits<_Elem>>
    class wbuffer_convert : public basic_streambuf<_Elem, _Tr>
    {
      typedef basic_streambuf<_Elem, _Tr> _Wide_streambuf;

    public:
      typedef typename _Codecvt::state_type state_type;

      /// Default constructor.
      wbuffer_convert() : wbuffer_convert(nullptr) { }

      /** Constructor.
       *
       * @param  __bytebuf The underlying byte stream buffer.
       * @param  __pcvt    The facet to use for conversions.
       * @param  __state   Initial conversion state.
       *
       * Takes ownership of @p __pcvt and will delete it in the destructor.
       */
      explicit
      wbuffer_convert(streambuf* __bytebuf, _Codecvt* __pcvt = new _Codecvt,
		      state_type __state = state_type())
      : _M_buf(__bytebuf), _M_cvt(__pcvt), _M_state(__state)
      {
	if (!_M_cvt)
	  __throw_logic_error("wbuffer_convert");

	_M_always_noconv = _M_cvt->always_noconv();

	if (_M_buf)
	  {
	    this->setp(_M_put_area, _M_put_area + _S_buffer_length);
	    this->setg(_M_get_area + _S_putback_length,
		       _M_get_area + _S_putback_length,
		       _M_get_area + _S_putback_length);
	  }
      }

      ~wbuffer_convert() = default;

      // _GLIBCXX_RESOLVE_LIB_DEFECTS
      // 2176. Special members for wstring_convert and wbuffer_convert
      wbuffer_convert(const wbuffer_convert&) = delete;
      wbuffer_convert& operator=(const wbuffer_convert&) = delete;

      streambuf* rdbuf() const noexcept { return _M_buf; }

      streambuf*
      rdbuf(streambuf *__bytebuf) noexcept
      {
	auto __prev = _M_buf;
	_M_buf = __bytebuf;
	return __prev;
      }

      /// The conversion state following the last conversion.
      state_type state() const noexcept { return _M_state; }

    protected:
      int
      sync()
      { return _M_buf && _M_conv_put() && !_M_buf->pubsync() ? 0 : -1; }

      typename _Wide_streambuf::int_type
      overflow(typename _Wide_streambuf::int_type __out)
      {
	if (!_M_buf || !_M_conv_put())
	  return _Tr::eof();
	else if (!_Tr::eq_int_type(__out, _Tr::eof()))
	  return this->sputc(__out);
	return _Tr::not_eof(__out);
      }

      typename _Wide_streambuf::int_type
      underflow()
      {
	if (!_M_buf)
	  return _Tr::eof();

	if (this->gptr() < this->egptr() || (_M_buf && _M_conv_get()))
	  return _Tr::to_int_type(*this->gptr());
	else
	  return _Tr::eof();
      }

      streamsize
      xsputn(const typename _Wide_streambuf::char_type* __s, streamsize __n)
      {
	if (!_M_buf || __n == 0)
	  return 0;
	streamsize __done = 0;
	do
	{
	  auto __nn = std::min<streamsize>(this->epptr() - this->pptr(),
					   __n - __done);
	  _Tr::copy(this->pptr(), __s + __done, __nn);
	  this->pbump(__nn);
	  __done += __nn;
	} while (__done < __n && _M_conv_put());
	return __done;
      }

    private:
      // fill the get area from converted contents of the byte stream buffer
      bool
      _M_conv_get()
      {
	const streamsize __pb1 = this->gptr() - this->eback();
	const streamsize __pb2 = _S_putback_length;
	const streamsize __npb = std::min(__pb1, __pb2);

	_Tr::move(_M_get_area + _S_putback_length - __npb,
		  this->gptr() - __npb, __npb);

	streamsize __nbytes = sizeof(_M_get_buf) - _M_unconv;
	__nbytes = std::min(__nbytes, _M_buf->in_avail());
	if (__nbytes < 1)
	  __nbytes = 1;
	__nbytes = _M_buf->sgetn(_M_get_buf + _M_unconv, __nbytes);
	if (__nbytes < 1)
	  return false;
	__nbytes += _M_unconv;

	// convert _M_get_buf into _M_get_area

	_Elem* __outbuf = _M_get_area + _S_putback_length;
	_Elem* __outnext = __outbuf;
	const char* __bnext = _M_get_buf;

	codecvt_base::result __result;
	if (_M_always_noconv)
	  __result = codecvt_base::noconv;
	else
	  {
	    _Elem* __outend = _M_get_area + _S_buffer_length;

	    __result = _M_cvt->in(_M_state,
				  __bnext, __bnext + __nbytes, __bnext,
				  __outbuf, __outend, __outnext);
	  }

	if (__result == codecvt_base::noconv)
	  {
	    // cast is safe because noconv means _Elem is same type as char
	    auto __get_buf = reinterpret_cast<const _Elem*>(_M_get_buf);
	    _Tr::copy(__outbuf, __get_buf, __nbytes);
	    _M_unconv = 0;
	    return true;
	  }

	if ((_M_unconv = _M_get_buf + __nbytes - __bnext))
	  char_traits<char>::move(_M_get_buf, __bnext, _M_unconv);

	this->setg(__outbuf, __outbuf, __outnext);

	return __result != codecvt_base::error;
      }

      // unused
      bool
      _M_put(...)
      { return false; }

      bool
      _M_put(const char* __p, streamsize __n)
      {
	if (_M_buf->sputn(__p, __n) < __n)
	  return false;
	return true;
      }

      // convert the put area and write to the byte stream buffer
      bool
      _M_conv_put()
      {
	_Elem* const __first = this->pbase();
	const _Elem* const __last = this->pptr();
	const streamsize __pending = __last - __first;

	if (_M_always_noconv)
	  return _M_put(__first, __pending);

	char __outbuf[2 * _S_buffer_length];

	const _Elem* __next = __first;
	const _Elem* __start;
	do
	  {
	    __start = __next;
	    char* __outnext = __outbuf;
	    char* const __outlast = __outbuf + sizeof(__outbuf);
	    auto __result = _M_cvt->out(_M_state, __next, __last, __next,
					__outnext, __outlast, __outnext);
	    if (__result == codecvt_base::error)
	      return false;
	    else if (__result == codecvt_base::noconv)
	      return _M_put(__next, __pending);

	    if (!_M_put(__outbuf, __outnext - __outbuf))
	      return false;
	  }
	while (__next != __last && __next != __start);

	if (__next != __last)
	  _Tr::move(__first, __next, __last - __next);

	this->pbump(__first - __next);
	return __next != __first;
      }

      streambuf*		_M_buf;
      unique_ptr<_Codecvt>	_M_cvt;
      state_type		_M_state;

      static const streamsize	_S_buffer_length = 32;
      static const streamsize	_S_putback_length = 3;
      _Elem                     _M_put_area[_S_buffer_length];
      _Elem                     _M_get_area[_S_buffer_length];
      streamsize		_M_unconv = 0;
      char			_M_get_buf[_S_buffer_length-_S_putback_length];
      bool			_M_always_noconv;
    };

#endif  // _GLIBCXX_USE_WCHAR_T

  /// @} group locales

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif // __cplusplus

#endif /* _LOCALE_CONV_H */