1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include <__config>
10#include <__locale>
11#include <algorithm>
12#include <ios>
13#include <limits>
14#include <memory>
15#include <new>
16#include <stdlib.h>
17#include <string>
18
19#include "include/config_elast.h"
20
21_LIBCPP_PUSH_MACROS
22#include <__undef_macros>
23
24_LIBCPP_BEGIN_NAMESPACE_STD
25
26class _LIBCPP_HIDDEN __iostream_category : public __do_message {
27public:
28 virtual const char* name() const noexcept;
29 virtual string message(int ev) const;
30};
31
32const char* __iostream_category::name() const noexcept { return "iostream"; }
33
34string __iostream_category::message(int ev) const {
35 if (ev != static_cast<int>(io_errc::stream)
36#ifdef _LIBCPP_ELAST
37 && ev <= _LIBCPP_ELAST
38#endif // _LIBCPP_ELAST
39 )
40 return __do_message::message(ev);
41 return string("unspecified iostream_category error");
42}
43
44const error_category& iostream_category() noexcept {
45 union AvoidDestroyingIostreamCategory {
46 __iostream_category iostream_error_category;
47 constexpr explicit AvoidDestroyingIostreamCategory() : iostream_error_category() {}
48 ~AvoidDestroyingIostreamCategory() {}
49 };
50 constinit static AvoidDestroyingIostreamCategory helper;
51 return helper.iostream_error_category;
52}
53
54// ios_base::failure
55
56ios_base::failure::failure(const string& msg, const error_code& ec) : system_error(ec, msg) {}
57
58ios_base::failure::failure(const char* msg, const error_code& ec) : system_error(ec, msg) {}
59
60ios_base::failure::~failure() throw() {}
61
62// ios_base locale
63
64const ios_base::fmtflags ios_base::boolalpha;
65const ios_base::fmtflags ios_base::dec;
66const ios_base::fmtflags ios_base::fixed;
67const ios_base::fmtflags ios_base::hex;
68const ios_base::fmtflags ios_base::internal;
69const ios_base::fmtflags ios_base::left;
70const ios_base::fmtflags ios_base::oct;
71const ios_base::fmtflags ios_base::right;
72const ios_base::fmtflags ios_base::scientific;
73const ios_base::fmtflags ios_base::showbase;
74const ios_base::fmtflags ios_base::showpoint;
75const ios_base::fmtflags ios_base::showpos;
76const ios_base::fmtflags ios_base::skipws;
77const ios_base::fmtflags ios_base::unitbuf;
78const ios_base::fmtflags ios_base::uppercase;
79const ios_base::fmtflags ios_base::adjustfield;
80const ios_base::fmtflags ios_base::basefield;
81const ios_base::fmtflags ios_base::floatfield;
82
83const ios_base::iostate ios_base::badbit;
84const ios_base::iostate ios_base::eofbit;
85const ios_base::iostate ios_base::failbit;
86const ios_base::iostate ios_base::goodbit;
87
88const ios_base::openmode ios_base::app;
89const ios_base::openmode ios_base::ate;
90const ios_base::openmode ios_base::binary;
91const ios_base::openmode ios_base::in;
92const ios_base::openmode ios_base::out;
93const ios_base::openmode ios_base::trunc;
94
95void ios_base::__call_callbacks(event ev) {
96 for (size_t i = __event_size_; i;) {
97 --i;
98 __fn_[i](ev, *this, __index_[i]);
99 }
100}
101
102// locale
103
104locale ios_base::imbue(const locale& newloc) {
105 static_assert(sizeof(locale) == sizeof(__loc_), "");
106 locale& loc_storage = *reinterpret_cast<locale*>(&__loc_);
107 locale oldloc = loc_storage;
108 loc_storage = newloc;
109 __call_callbacks(imbue_event);
110 return oldloc;
111}
112
113locale ios_base::getloc() const {
114 const locale& loc_storage = *reinterpret_cast<const locale*>(&__loc_);
115 return loc_storage;
116}
117
118// xalloc
119#if defined(_LIBCPP_HAS_C_ATOMIC_IMP) && !defined(_LIBCPP_HAS_NO_THREADS)
120atomic<int> ios_base::__xindex_{0};
121#else
122int ios_base::__xindex_ = 0;
123#endif
124
125template <typename _Tp>
126static size_t __ios_new_cap(size_t __req_size, size_t __current_cap) { // Precondition: __req_size > __current_cap
127 const size_t mx = std::numeric_limits<size_t>::max() / sizeof(_Tp);
128 if (__req_size < mx / 2)
129 return std::max(a: 2 * __current_cap, b: __req_size);
130 else
131 return mx;
132}
133
134int ios_base::xalloc() { return __xindex_++; }
135
136long& ios_base::iword(int index) {
137 size_t req_size = static_cast<size_t>(index) + 1;
138 if (req_size > __iarray_cap_) {
139 size_t newcap = __ios_new_cap<long>(req_size, __iarray_cap_);
140 long* iarray = static_cast<long*>(realloc(__iarray_, newcap * sizeof(long)));
141 if (iarray == 0) {
142 setstate(badbit);
143 static long error;
144 error = 0;
145 return error;
146 }
147 __iarray_ = iarray;
148 for (long* p = __iarray_ + __iarray_size_; p < __iarray_ + newcap; ++p)
149 *p = 0;
150 __iarray_cap_ = newcap;
151 }
152 __iarray_size_ = max<size_t>(__iarray_size_, req_size);
153 return __iarray_[index];
154}
155
156void*& ios_base::pword(int index) {
157 size_t req_size = static_cast<size_t>(index) + 1;
158 if (req_size > __parray_cap_) {
159 size_t newcap = __ios_new_cap<void*>(req_size, __iarray_cap_);
160 void** parray = static_cast<void**>(realloc(__parray_, newcap * sizeof(void*)));
161 if (parray == 0) {
162 setstate(badbit);
163 static void* error;
164 error = 0;
165 return error;
166 }
167 __parray_ = parray;
168 for (void** p = __parray_ + __parray_size_; p < __parray_ + newcap; ++p)
169 *p = 0;
170 __parray_cap_ = newcap;
171 }
172 __parray_size_ = max<size_t>(__parray_size_, req_size);
173 return __parray_[index];
174}
175
176// register_callback
177
178void ios_base::register_callback(event_callback fn, int index) {
179 size_t req_size = __event_size_ + 1;
180 if (req_size > __event_cap_) {
181 size_t newcap = __ios_new_cap<event_callback>(req_size, __event_cap_);
182 event_callback* fns = static_cast<event_callback*>(realloc(__fn_, newcap * sizeof(event_callback)));
183 if (fns == 0)
184 setstate(badbit);
185 __fn_ = fns;
186 int* indxs = static_cast<int*>(realloc(__index_, newcap * sizeof(int)));
187 if (indxs == 0)
188 setstate(badbit);
189 __index_ = indxs;
190 __event_cap_ = newcap;
191 }
192 __fn_[__event_size_] = fn;
193 __index_[__event_size_] = index;
194 ++__event_size_;
195}
196
197ios_base::~ios_base() {
198 // Avoid UB when not properly initialized. See ios_base::ios_base for
199 // more information.
200 if (!__loc_)
201 return;
202 __call_callbacks(erase_event);
203 locale& loc_storage = *reinterpret_cast<locale*>(&__loc_);
204 loc_storage.~locale();
205 free(__fn_);
206 free(__index_);
207 free(__iarray_);
208 free(__parray_);
209}
210
211// iostate
212
213void ios_base::clear(iostate state) {
214 if (__rdbuf_)
215 __rdstate_ = state;
216 else
217 __rdstate_ = state | badbit;
218
219 if (((state | (__rdbuf_ ? goodbit : badbit)) & __exceptions_) != 0)
220 __throw_failure("ios_base::clear");
221}
222
223// init
224
225void ios_base::init(void* sb) {
226 __rdbuf_ = sb;
227 __rdstate_ = __rdbuf_ ? goodbit : badbit;
228 __exceptions_ = goodbit;
229 __fmtflags_ = skipws | dec;
230 __width_ = 0;
231 __precision_ = 6;
232 __fn_ = 0;
233 __index_ = 0;
234 __event_size_ = 0;
235 __event_cap_ = 0;
236 __iarray_ = 0;
237 __iarray_size_ = 0;
238 __iarray_cap_ = 0;
239 __parray_ = 0;
240 __parray_size_ = 0;
241 __parray_cap_ = 0;
242 ::new (&__loc_) locale;
243}
244
245void ios_base::copyfmt(const ios_base& rhs) {
246 // If we can't acquire the needed resources, throw bad_alloc (can't set badbit)
247 // Don't alter *this until all needed resources are acquired
248 unique_ptr<event_callback, void (*)(void*)> new_callbacks(0, free);
249 unique_ptr<int, void (*)(void*)> new_ints(0, free);
250 unique_ptr<long, void (*)(void*)> new_longs(0, free);
251 unique_ptr<void*, void (*)(void*)> new_pointers(0, free);
252 if (__event_cap_ < rhs.__event_size_) {
253 size_t newesize = sizeof(event_callback) * rhs.__event_size_;
254 new_callbacks.reset(static_cast<event_callback*>(malloc(newesize)));
255 if (!new_callbacks)
256 __throw_bad_alloc();
257
258 size_t newisize = sizeof(int) * rhs.__event_size_;
259 new_ints.reset(static_cast<int*>(malloc(newisize)));
260 if (!new_ints)
261 __throw_bad_alloc();
262 }
263 if (__iarray_cap_ < rhs.__iarray_size_) {
264 size_t newsize = sizeof(long) * rhs.__iarray_size_;
265 new_longs.reset(static_cast<long*>(malloc(newsize)));
266 if (!new_longs)
267 __throw_bad_alloc();
268 }
269 if (__parray_cap_ < rhs.__parray_size_) {
270 size_t newsize = sizeof(void*) * rhs.__parray_size_;
271 new_pointers.reset(static_cast<void**>(malloc(newsize)));
272 if (!new_pointers)
273 __throw_bad_alloc();
274 }
275 // Got everything we need. Copy everything but __rdstate_, __rdbuf_ and __exceptions_
276 __fmtflags_ = rhs.__fmtflags_;
277 __precision_ = rhs.__precision_;
278 __width_ = rhs.__width_;
279 locale& lhs_loc = *reinterpret_cast<locale*>(&__loc_);
280 const locale& rhs_loc = *reinterpret_cast<const locale*>(&rhs.__loc_);
281 lhs_loc = rhs_loc;
282 if (__event_cap_ < rhs.__event_size_) {
283 free(__fn_);
284 __fn_ = new_callbacks.release();
285 free(__index_);
286 __index_ = new_ints.release();
287 __event_cap_ = rhs.__event_size_;
288 }
289 for (__event_size_ = 0; __event_size_ < rhs.__event_size_; ++__event_size_) {
290 __fn_[__event_size_] = rhs.__fn_[__event_size_];
291 __index_[__event_size_] = rhs.__index_[__event_size_];
292 }
293 if (__iarray_cap_ < rhs.__iarray_size_) {
294 free(__iarray_);
295 __iarray_ = new_longs.release();
296 __iarray_cap_ = rhs.__iarray_size_;
297 }
298 for (__iarray_size_ = 0; __iarray_size_ < rhs.__iarray_size_; ++__iarray_size_)
299 __iarray_[__iarray_size_] = rhs.__iarray_[__iarray_size_];
300 if (__parray_cap_ < rhs.__parray_size_) {
301 free(__parray_);
302 __parray_ = new_pointers.release();
303 __parray_cap_ = rhs.__parray_size_;
304 }
305 for (__parray_size_ = 0; __parray_size_ < rhs.__parray_size_; ++__parray_size_)
306 __parray_[__parray_size_] = rhs.__parray_[__parray_size_];
307}
308
309void ios_base::move(ios_base& rhs) {
310 // *this is uninitialized
311 __fmtflags_ = rhs.__fmtflags_;
312 __precision_ = rhs.__precision_;
313 __width_ = rhs.__width_;
314 __rdstate_ = rhs.__rdstate_;
315 __exceptions_ = rhs.__exceptions_;
316 __rdbuf_ = 0;
317 locale& rhs_loc = *reinterpret_cast<locale*>(&rhs.__loc_);
318 ::new (&__loc_) locale(rhs_loc);
319 __fn_ = rhs.__fn_;
320 rhs.__fn_ = 0;
321 __index_ = rhs.__index_;
322 rhs.__index_ = 0;
323 __event_size_ = rhs.__event_size_;
324 rhs.__event_size_ = 0;
325 __event_cap_ = rhs.__event_cap_;
326 rhs.__event_cap_ = 0;
327 __iarray_ = rhs.__iarray_;
328 rhs.__iarray_ = 0;
329 __iarray_size_ = rhs.__iarray_size_;
330 rhs.__iarray_size_ = 0;
331 __iarray_cap_ = rhs.__iarray_cap_;
332 rhs.__iarray_cap_ = 0;
333 __parray_ = rhs.__parray_;
334 rhs.__parray_ = 0;
335 __parray_size_ = rhs.__parray_size_;
336 rhs.__parray_size_ = 0;
337 __parray_cap_ = rhs.__parray_cap_;
338 rhs.__parray_cap_ = 0;
339}
340
341void ios_base::swap(ios_base& rhs) noexcept {
342 std::swap(__fmtflags_, rhs.__fmtflags_);
343 std::swap(__precision_, rhs.__precision_);
344 std::swap(__width_, rhs.__width_);
345 std::swap(__rdstate_, rhs.__rdstate_);
346 std::swap(__exceptions_, rhs.__exceptions_);
347 locale& lhs_loc = *reinterpret_cast<locale*>(&__loc_);
348 locale& rhs_loc = *reinterpret_cast<locale*>(&rhs.__loc_);
349 std::swap(lhs_loc, rhs_loc);
350 std::swap(__fn_, rhs.__fn_);
351 std::swap(__index_, rhs.__index_);
352 std::swap(__event_size_, rhs.__event_size_);
353 std::swap(__event_cap_, rhs.__event_cap_);
354 std::swap(__iarray_, rhs.__iarray_);
355 std::swap(__iarray_size_, rhs.__iarray_size_);
356 std::swap(__iarray_cap_, rhs.__iarray_cap_);
357 std::swap(__parray_, rhs.__parray_);
358 std::swap(__parray_size_, rhs.__parray_size_);
359 std::swap(__parray_cap_, rhs.__parray_cap_);
360}
361
362void ios_base::__set_badbit_and_consider_rethrow() {
363 __rdstate_ |= badbit;
364#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
365 if (__exceptions_ & badbit)
366 throw;
367#endif // _LIBCPP_HAS_NO_EXCEPTIONS
368}
369
370void ios_base::__set_failbit_and_consider_rethrow() {
371 __rdstate_ |= failbit;
372#ifndef _LIBCPP_HAS_NO_EXCEPTIONS
373 if (__exceptions_ & failbit)
374 throw;
375#endif // _LIBCPP_HAS_NO_EXCEPTIONS
376}
377
378bool ios_base::sync_with_stdio(bool sync) {
379 static bool previous_state = true;
380 bool r = previous_state;
381 previous_state = sync;
382 return r;
383}
384
385_LIBCPP_END_NAMESPACE_STD
386
387_LIBCPP_POP_MACROS
388

source code of libcxx/src/ios.cpp