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1 //===-------------------------- ios.cpp -----------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "__config"
11 
12 #include "ios"
13 
14 #include <stdlib.h>
15 
16 #include "__locale"
17 #include "algorithm"
18 #include "include/config_elast.h"
19 #include "istream"
20 #include "limits"
21 #include "memory"
22 #include "new"
23 #include "streambuf"
24 #include "string"
25 #include "__undef_macros"
26 
27 _LIBCPP_BEGIN_NAMESPACE_STD
28 
29 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ios<char>;
30 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ios<wchar_t>;
31 
32 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_streambuf<char>;
33 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_streambuf<wchar_t>;
34 
35 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_istream<char>;
36 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_istream<wchar_t>;
37 
38 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ostream<char>;
39 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_ostream<wchar_t>;
40 
41 template class _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS basic_iostream<char>;
42 
43 class _LIBCPP_HIDDEN __iostream_category
44     : public __do_message
45 {
46 public:
47     virtual const char* name() const _NOEXCEPT;
48     virtual string message(int ev) const;
49 };
50 
51 const char*
name() const52 __iostream_category::name() const _NOEXCEPT
53 {
54     return "iostream";
55 }
56 
57 string
message(int ev) const58 __iostream_category::message(int ev) const
59 {
60     if (ev != static_cast<int>(io_errc::stream)
61 #ifdef _LIBCPP_ELAST
62         && ev <= _LIBCPP_ELAST
63 #endif  // _LIBCPP_ELAST
64         )
65         return __do_message::message(ev);
66     return string("unspecified iostream_category error");
67 }
68 
69 const error_category&
iostream_category()70 iostream_category() _NOEXCEPT
71 {
72     static __iostream_category s;
73     return s;
74 }
75 
76 // ios_base::failure
77 
failure(const string & msg,const error_code & ec)78 ios_base::failure::failure(const string& msg, const error_code& ec)
79     : system_error(ec, msg)
80 {
81 }
82 
failure(const char * msg,const error_code & ec)83 ios_base::failure::failure(const char* msg, const error_code& ec)
84     : system_error(ec, msg)
85 {
86 }
87 
~failure()88 ios_base::failure::~failure() throw()
89 {
90 }
91 
92 // ios_base locale
93 
94 const ios_base::fmtflags ios_base::boolalpha;
95 const ios_base::fmtflags ios_base::dec;
96 const ios_base::fmtflags ios_base::fixed;
97 const ios_base::fmtflags ios_base::hex;
98 const ios_base::fmtflags ios_base::internal;
99 const ios_base::fmtflags ios_base::left;
100 const ios_base::fmtflags ios_base::oct;
101 const ios_base::fmtflags ios_base::right;
102 const ios_base::fmtflags ios_base::scientific;
103 const ios_base::fmtflags ios_base::showbase;
104 const ios_base::fmtflags ios_base::showpoint;
105 const ios_base::fmtflags ios_base::showpos;
106 const ios_base::fmtflags ios_base::skipws;
107 const ios_base::fmtflags ios_base::unitbuf;
108 const ios_base::fmtflags ios_base::uppercase;
109 const ios_base::fmtflags ios_base::adjustfield;
110 const ios_base::fmtflags ios_base::basefield;
111 const ios_base::fmtflags ios_base::floatfield;
112 
113 const ios_base::iostate ios_base::badbit;
114 const ios_base::iostate ios_base::eofbit;
115 const ios_base::iostate ios_base::failbit;
116 const ios_base::iostate ios_base::goodbit;
117 
118 const ios_base::openmode ios_base::app;
119 const ios_base::openmode ios_base::ate;
120 const ios_base::openmode ios_base::binary;
121 const ios_base::openmode ios_base::in;
122 const ios_base::openmode ios_base::out;
123 const ios_base::openmode ios_base::trunc;
124 
125 void
__call_callbacks(event ev)126 ios_base::__call_callbacks(event ev)
127 {
128     for (size_t i = __event_size_; i;)
129     {
130         --i;
131         __fn_[i](ev, *this, __index_[i]);
132     }
133 }
134 
135 // locale
136 
137 locale
imbue(const locale & newloc)138 ios_base::imbue(const locale& newloc)
139 {
140     static_assert(sizeof(locale) == sizeof(__loc_), "");
141     locale& loc_storage = *reinterpret_cast<locale*>(&__loc_);
142     locale oldloc = loc_storage;
143     loc_storage = newloc;
144     __call_callbacks(imbue_event);
145     return oldloc;
146 }
147 
148 locale
getloc() const149 ios_base::getloc() const
150 {
151     const locale& loc_storage = *reinterpret_cast<const locale*>(&__loc_);
152     return loc_storage;
153 }
154 
155 // xalloc
156 #if defined(_LIBCPP_HAS_C_ATOMIC_IMP) && !defined(_LIBCPP_HAS_NO_THREADS)
157 atomic<int> ios_base::__xindex_ = ATOMIC_VAR_INIT(0);
158 #else
159 int ios_base::__xindex_ = 0;
160 #endif
161 
162 template <typename _Tp>
__ios_new_cap(size_t __req_size,size_t __current_cap)163 static size_t __ios_new_cap(size_t __req_size, size_t __current_cap)
164 { // Precondition: __req_size > __current_cap
165 	const size_t mx = std::numeric_limits<size_t>::max() / sizeof(_Tp);
166 	if (__req_size < mx/2)
167 		return _VSTD::max(2 * __current_cap, __req_size);
168 	else
169 		return mx;
170 }
171 
172 int
xalloc()173 ios_base::xalloc()
174 {
175     return __xindex_++;
176 }
177 
178 long&
iword(int index)179 ios_base::iword(int index)
180 {
181     size_t req_size = static_cast<size_t>(index)+1;
182     if (req_size > __iarray_cap_)
183     {
184         size_t newcap = __ios_new_cap<long>(req_size, __iarray_cap_);
185         long* iarray = static_cast<long*>(realloc(__iarray_, newcap * sizeof(long)));
186         if (iarray == 0)
187         {
188             setstate(badbit);
189             static long error;
190             error = 0;
191             return error;
192         }
193         __iarray_ = iarray;
194         for (long* p = __iarray_ + __iarray_size_; p < __iarray_ + newcap; ++p)
195             *p = 0;
196         __iarray_cap_ = newcap;
197     }
198     __iarray_size_ = max<size_t>(__iarray_size_, req_size);
199     return __iarray_[index];
200 }
201 
202 void*&
pword(int index)203 ios_base::pword(int index)
204 {
205     size_t req_size = static_cast<size_t>(index)+1;
206     if (req_size > __parray_cap_)
207     {
208         size_t newcap = __ios_new_cap<void *>(req_size, __iarray_cap_);
209         void** parray = static_cast<void**>(realloc(__parray_, newcap * sizeof(void *)));
210         if (parray == 0)
211         {
212             setstate(badbit);
213             static void* error;
214             error = 0;
215             return error;
216         }
217         __parray_ = parray;
218         for (void** p = __parray_ + __parray_size_; p < __parray_ + newcap; ++p)
219             *p = 0;
220         __parray_cap_ = newcap;
221     }
222     __parray_size_ = max<size_t>(__parray_size_, req_size);
223     return __parray_[index];
224 }
225 
226 // register_callback
227 
228 void
register_callback(event_callback fn,int index)229 ios_base::register_callback(event_callback fn, int index)
230 {
231     size_t req_size = __event_size_ + 1;
232     if (req_size > __event_cap_)
233     {
234         size_t newcap = __ios_new_cap<event_callback>(req_size, __event_cap_);
235         event_callback* fns = static_cast<event_callback*>(realloc(__fn_, newcap * sizeof(event_callback)));
236         if (fns == 0)
237             setstate(badbit);
238         __fn_ = fns;
239         int* indxs = static_cast<int *>(realloc(__index_, newcap * sizeof(int)));
240         if (indxs == 0)
241             setstate(badbit);
242         __index_ = indxs;
243         __event_cap_ = newcap;
244     }
245     __fn_[__event_size_] = fn;
246     __index_[__event_size_] = index;
247     ++__event_size_;
248 }
249 
~ios_base()250 ios_base::~ios_base()
251 {
252     __call_callbacks(erase_event);
253     locale& loc_storage = *reinterpret_cast<locale*>(&__loc_);
254     loc_storage.~locale();
255     free(__fn_);
256     free(__index_);
257     free(__iarray_);
258     free(__parray_);
259 }
260 
261 // iostate
262 
263 void
clear(iostate state)264 ios_base::clear(iostate state)
265 {
266     if (__rdbuf_)
267         __rdstate_ = state;
268     else
269         __rdstate_ = state | badbit;
270 #ifndef _LIBCPP_NO_EXCEPTIONS
271     if (((state | (__rdbuf_ ? goodbit : badbit)) & __exceptions_) != 0)
272         throw failure("ios_base::clear");
273 #endif  // _LIBCPP_NO_EXCEPTIONS
274 }
275 
276 // init
277 
278 void
init(void * sb)279 ios_base::init(void* sb)
280 {
281     __rdbuf_ = sb;
282     __rdstate_ = __rdbuf_ ? goodbit : badbit;
283     __exceptions_ = goodbit;
284     __fmtflags_ = skipws | dec;
285     __width_ = 0;
286     __precision_ = 6;
287     __fn_ = 0;
288     __index_ = 0;
289     __event_size_ = 0;
290     __event_cap_ = 0;
291     __iarray_ = 0;
292     __iarray_size_ = 0;
293     __iarray_cap_ = 0;
294     __parray_ = 0;
295     __parray_size_ = 0;
296     __parray_cap_ = 0;
297     ::new(&__loc_) locale;
298 }
299 
300 void
copyfmt(const ios_base & rhs)301 ios_base::copyfmt(const ios_base& rhs)
302 {
303     // If we can't acquire the needed resources, throw bad_alloc (can't set badbit)
304     // Don't alter *this until all needed resources are acquired
305     unique_ptr<event_callback, void (*)(void*)> new_callbacks(0, free);
306     unique_ptr<int, void (*)(void*)> new_ints(0, free);
307     unique_ptr<long, void (*)(void*)> new_longs(0, free);
308     unique_ptr<void*, void (*)(void*)> new_pointers(0, free);
309     if (__event_cap_ < rhs.__event_size_)
310     {
311         size_t newesize = sizeof(event_callback) * rhs.__event_size_;
312         new_callbacks.reset(static_cast<event_callback*>(malloc(newesize)));
313 #ifndef _LIBCPP_NO_EXCEPTIONS
314         if (!new_callbacks)
315             throw bad_alloc();
316 #endif  // _LIBCPP_NO_EXCEPTIONS
317 
318         size_t newisize = sizeof(int) * rhs.__event_size_;
319         new_ints.reset(static_cast<int *>(malloc(newisize)));
320 #ifndef _LIBCPP_NO_EXCEPTIONS
321         if (!new_ints)
322             throw bad_alloc();
323 #endif  // _LIBCPP_NO_EXCEPTIONS
324     }
325     if (__iarray_cap_ < rhs.__iarray_size_)
326     {
327         size_t newsize = sizeof(long) * rhs.__iarray_size_;
328         new_longs.reset(static_cast<long*>(malloc(newsize)));
329 #ifndef _LIBCPP_NO_EXCEPTIONS
330         if (!new_longs)
331             throw bad_alloc();
332 #endif  // _LIBCPP_NO_EXCEPTIONS
333     }
334     if (__parray_cap_ < rhs.__parray_size_)
335     {
336         size_t newsize = sizeof(void*) * rhs.__parray_size_;
337         new_pointers.reset(static_cast<void**>(malloc(newsize)));
338 #ifndef _LIBCPP_NO_EXCEPTIONS
339         if (!new_pointers)
340             throw bad_alloc();
341 #endif  // _LIBCPP_NO_EXCEPTIONS
342     }
343     // Got everything we need.  Copy everything but __rdstate_, __rdbuf_ and __exceptions_
344     __fmtflags_ = rhs.__fmtflags_;
345     __precision_ = rhs.__precision_;
346     __width_ = rhs.__width_;
347     locale& lhs_loc = *reinterpret_cast<locale*>(&__loc_);
348     const locale& rhs_loc = *reinterpret_cast<const locale*>(&rhs.__loc_);
349     lhs_loc = rhs_loc;
350     if (__event_cap_ < rhs.__event_size_)
351     {
352         free(__fn_);
353         __fn_ = new_callbacks.release();
354         free(__index_);
355         __index_ = new_ints.release();
356         __event_cap_ = rhs.__event_size_;
357     }
358     for (__event_size_ = 0; __event_size_ < rhs.__event_size_; ++__event_size_)
359     {
360         __fn_[__event_size_] = rhs.__fn_[__event_size_];
361         __index_[__event_size_] = rhs.__index_[__event_size_];
362     }
363     if (__iarray_cap_ < rhs.__iarray_size_)
364     {
365         free(__iarray_);
366         __iarray_ = new_longs.release();
367         __iarray_cap_ = rhs.__iarray_size_;
368     }
369     for (__iarray_size_ = 0; __iarray_size_ < rhs.__iarray_size_; ++__iarray_size_)
370         __iarray_[__iarray_size_] = rhs.__iarray_[__iarray_size_];
371     if (__parray_cap_ < rhs.__parray_size_)
372     {
373         free(__parray_);
374         __parray_ = new_pointers.release();
375         __parray_cap_ = rhs.__parray_size_;
376     }
377     for (__parray_size_ = 0; __parray_size_ < rhs.__parray_size_; ++__parray_size_)
378         __parray_[__parray_size_] = rhs.__parray_[__parray_size_];
379 }
380 
381 void
move(ios_base & rhs)382 ios_base::move(ios_base& rhs)
383 {
384     // *this is uninitialized
385     __fmtflags_ = rhs.__fmtflags_;
386     __precision_ = rhs.__precision_;
387     __width_ = rhs.__width_;
388     __rdstate_ = rhs.__rdstate_;
389     __exceptions_ = rhs.__exceptions_;
390     __rdbuf_ = 0;
391     locale& rhs_loc = *reinterpret_cast<locale*>(&rhs.__loc_);
392     ::new(&__loc_) locale(rhs_loc);
393     __fn_ = rhs.__fn_;
394     rhs.__fn_ = 0;
395     __index_ = rhs.__index_;
396     rhs.__index_ = 0;
397     __event_size_ = rhs.__event_size_;
398     rhs.__event_size_ = 0;
399     __event_cap_ = rhs.__event_cap_;
400     rhs.__event_cap_ = 0;
401     __iarray_ = rhs.__iarray_;
402     rhs.__iarray_ = 0;
403     __iarray_size_ = rhs.__iarray_size_;
404     rhs.__iarray_size_ = 0;
405     __iarray_cap_ = rhs.__iarray_cap_;
406     rhs.__iarray_cap_ = 0;
407     __parray_ = rhs.__parray_;
408     rhs.__parray_ = 0;
409     __parray_size_ = rhs.__parray_size_;
410     rhs.__parray_size_ = 0;
411     __parray_cap_ = rhs.__parray_cap_;
412     rhs.__parray_cap_ = 0;
413 }
414 
415 void
swap(ios_base & rhs)416 ios_base::swap(ios_base& rhs) _NOEXCEPT
417 {
418     _VSTD::swap(__fmtflags_, rhs.__fmtflags_);
419     _VSTD::swap(__precision_, rhs.__precision_);
420     _VSTD::swap(__width_, rhs.__width_);
421     _VSTD::swap(__rdstate_, rhs.__rdstate_);
422     _VSTD::swap(__exceptions_, rhs.__exceptions_);
423     locale& lhs_loc = *reinterpret_cast<locale*>(&__loc_);
424     locale& rhs_loc = *reinterpret_cast<locale*>(&rhs.__loc_);
425     _VSTD::swap(lhs_loc, rhs_loc);
426     _VSTD::swap(__fn_, rhs.__fn_);
427     _VSTD::swap(__index_, rhs.__index_);
428     _VSTD::swap(__event_size_, rhs.__event_size_);
429     _VSTD::swap(__event_cap_, rhs.__event_cap_);
430     _VSTD::swap(__iarray_, rhs.__iarray_);
431     _VSTD::swap(__iarray_size_, rhs.__iarray_size_);
432     _VSTD::swap(__iarray_cap_, rhs.__iarray_cap_);
433     _VSTD::swap(__parray_, rhs.__parray_);
434     _VSTD::swap(__parray_size_, rhs.__parray_size_);
435     _VSTD::swap(__parray_cap_, rhs.__parray_cap_);
436 }
437 
438 void
__set_badbit_and_consider_rethrow()439 ios_base::__set_badbit_and_consider_rethrow()
440 {
441     __rdstate_ |= badbit;
442 #ifndef _LIBCPP_NO_EXCEPTIONS
443     if (__exceptions_ & badbit)
444         throw;
445 #endif  // _LIBCPP_NO_EXCEPTIONS
446 }
447 
448 void
__set_failbit_and_consider_rethrow()449 ios_base::__set_failbit_and_consider_rethrow()
450 {
451     __rdstate_ |= failbit;
452 #ifndef _LIBCPP_NO_EXCEPTIONS
453     if (__exceptions_ & failbit)
454         throw;
455 #endif  // _LIBCPP_NO_EXCEPTIONS
456 }
457 
458 bool
sync_with_stdio(bool sync)459 ios_base::sync_with_stdio(bool sync)
460 {
461     static bool previous_state = true;
462     bool r = previous_state;
463     previous_state = sync;
464     return r;
465 }
466 
467 _LIBCPP_END_NAMESPACE_STD
468