1 //===-- IOHandler.cpp -----------------------------------------------------===//
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 "lldb/Core/IOHandler.h"
10
11 #if defined(__APPLE__)
12 #include <deque>
13 #endif
14 #include <string>
15
16 #include "lldb/Core/Debugger.h"
17 #include "lldb/Core/StreamFile.h"
18 #include "lldb/Host/Config.h"
19 #include "lldb/Host/File.h"
20 #include "lldb/Utility/Predicate.h"
21 #include "lldb/Utility/ReproducerProvider.h"
22 #include "lldb/Utility/Status.h"
23 #include "lldb/Utility/StreamString.h"
24 #include "lldb/Utility/StringList.h"
25 #include "lldb/lldb-forward.h"
26
27 #if LLDB_ENABLE_LIBEDIT
28 #include "lldb/Host/Editline.h"
29 #endif
30 #include "lldb/Interpreter/CommandCompletions.h"
31 #include "lldb/Interpreter/CommandInterpreter.h"
32 #include "llvm/ADT/StringRef.h"
33
34 #ifdef _WIN32
35 #include "lldb/Host/windows/windows.h"
36 #endif
37
38 #include <memory>
39 #include <mutex>
40
41 #include <assert.h>
42 #include <ctype.h>
43 #include <errno.h>
44 #include <locale.h>
45 #include <stdint.h>
46 #include <stdio.h>
47 #include <string.h>
48 #include <type_traits>
49
50 using namespace lldb;
51 using namespace lldb_private;
52 using llvm::None;
53 using llvm::Optional;
54 using llvm::StringRef;
55
IOHandler(Debugger & debugger,IOHandler::Type type)56 IOHandler::IOHandler(Debugger &debugger, IOHandler::Type type)
57 : IOHandler(debugger, type,
58 FileSP(), // Adopt STDIN from top input reader
59 StreamFileSP(), // Adopt STDOUT from top input reader
60 StreamFileSP(), // Adopt STDERR from top input reader
61 0, // Flags
62 nullptr // Shadow file recorder
63 ) {}
64
IOHandler(Debugger & debugger,IOHandler::Type type,const lldb::FileSP & input_sp,const lldb::StreamFileSP & output_sp,const lldb::StreamFileSP & error_sp,uint32_t flags,repro::DataRecorder * data_recorder)65 IOHandler::IOHandler(Debugger &debugger, IOHandler::Type type,
66 const lldb::FileSP &input_sp,
67 const lldb::StreamFileSP &output_sp,
68 const lldb::StreamFileSP &error_sp, uint32_t flags,
69 repro::DataRecorder *data_recorder)
70 : m_debugger(debugger), m_input_sp(input_sp), m_output_sp(output_sp),
71 m_error_sp(error_sp), m_data_recorder(data_recorder), m_popped(false),
72 m_flags(flags), m_type(type), m_user_data(nullptr), m_done(false),
73 m_active(false) {
74 // If any files are not specified, then adopt them from the top input reader.
75 if (!m_input_sp || !m_output_sp || !m_error_sp)
76 debugger.AdoptTopIOHandlerFilesIfInvalid(m_input_sp, m_output_sp,
77 m_error_sp);
78 }
79
80 IOHandler::~IOHandler() = default;
81
GetInputFD()82 int IOHandler::GetInputFD() {
83 return (m_input_sp ? m_input_sp->GetDescriptor() : -1);
84 }
85
GetOutputFD()86 int IOHandler::GetOutputFD() {
87 return (m_output_sp ? m_output_sp->GetFile().GetDescriptor() : -1);
88 }
89
GetErrorFD()90 int IOHandler::GetErrorFD() {
91 return (m_error_sp ? m_error_sp->GetFile().GetDescriptor() : -1);
92 }
93
GetInputFILE()94 FILE *IOHandler::GetInputFILE() {
95 return (m_input_sp ? m_input_sp->GetStream() : nullptr);
96 }
97
GetOutputFILE()98 FILE *IOHandler::GetOutputFILE() {
99 return (m_output_sp ? m_output_sp->GetFile().GetStream() : nullptr);
100 }
101
GetErrorFILE()102 FILE *IOHandler::GetErrorFILE() {
103 return (m_error_sp ? m_error_sp->GetFile().GetStream() : nullptr);
104 }
105
GetInputFileSP()106 FileSP IOHandler::GetInputFileSP() { return m_input_sp; }
107
GetOutputStreamFileSP()108 StreamFileSP IOHandler::GetOutputStreamFileSP() { return m_output_sp; }
109
GetErrorStreamFileSP()110 StreamFileSP IOHandler::GetErrorStreamFileSP() { return m_error_sp; }
111
GetIsInteractive()112 bool IOHandler::GetIsInteractive() {
113 return GetInputFileSP() ? GetInputFileSP()->GetIsInteractive() : false;
114 }
115
GetIsRealTerminal()116 bool IOHandler::GetIsRealTerminal() {
117 return GetInputFileSP() ? GetInputFileSP()->GetIsRealTerminal() : false;
118 }
119
SetPopped(bool b)120 void IOHandler::SetPopped(bool b) { m_popped.SetValue(b, eBroadcastOnChange); }
121
WaitForPop()122 void IOHandler::WaitForPop() { m_popped.WaitForValueEqualTo(true); }
123
PrintAsync(Stream * stream,const char * s,size_t len)124 void IOHandlerStack::PrintAsync(Stream *stream, const char *s, size_t len) {
125 if (stream) {
126 std::lock_guard<std::recursive_mutex> guard(m_mutex);
127 if (m_top)
128 m_top->PrintAsync(stream, s, len);
129 else
130 stream->Write(s, len);
131 }
132 }
133
IOHandlerConfirm(Debugger & debugger,llvm::StringRef prompt,bool default_response)134 IOHandlerConfirm::IOHandlerConfirm(Debugger &debugger, llvm::StringRef prompt,
135 bool default_response)
136 : IOHandlerEditline(
137 debugger, IOHandler::Type::Confirm,
138 nullptr, // nullptr editline_name means no history loaded/saved
139 llvm::StringRef(), // No prompt
140 llvm::StringRef(), // No continuation prompt
141 false, // Multi-line
142 false, // Don't colorize the prompt (i.e. the confirm message.)
143 0, *this, nullptr),
144 m_default_response(default_response), m_user_response(default_response) {
145 StreamString prompt_stream;
146 prompt_stream.PutCString(prompt);
147 if (m_default_response)
148 prompt_stream.Printf(": [Y/n] ");
149 else
150 prompt_stream.Printf(": [y/N] ");
151
152 SetPrompt(prompt_stream.GetString());
153 }
154
155 IOHandlerConfirm::~IOHandlerConfirm() = default;
156
IOHandlerComplete(IOHandler & io_handler,CompletionRequest & request)157 void IOHandlerConfirm::IOHandlerComplete(IOHandler &io_handler,
158 CompletionRequest &request) {
159 if (request.GetRawCursorPos() != 0)
160 return;
161 request.AddCompletion(m_default_response ? "y" : "n");
162 }
163
IOHandlerInputComplete(IOHandler & io_handler,std::string & line)164 void IOHandlerConfirm::IOHandlerInputComplete(IOHandler &io_handler,
165 std::string &line) {
166 if (line.empty()) {
167 // User just hit enter, set the response to the default
168 m_user_response = m_default_response;
169 io_handler.SetIsDone(true);
170 return;
171 }
172
173 if (line.size() == 1) {
174 switch (line[0]) {
175 case 'y':
176 case 'Y':
177 m_user_response = true;
178 io_handler.SetIsDone(true);
179 return;
180 case 'n':
181 case 'N':
182 m_user_response = false;
183 io_handler.SetIsDone(true);
184 return;
185 default:
186 break;
187 }
188 }
189
190 if (line == "yes" || line == "YES" || line == "Yes") {
191 m_user_response = true;
192 io_handler.SetIsDone(true);
193 } else if (line == "no" || line == "NO" || line == "No") {
194 m_user_response = false;
195 io_handler.SetIsDone(true);
196 }
197 }
198
199 llvm::Optional<std::string>
IOHandlerSuggestion(IOHandler & io_handler,llvm::StringRef line)200 IOHandlerDelegate::IOHandlerSuggestion(IOHandler &io_handler,
201 llvm::StringRef line) {
202 return io_handler.GetDebugger()
203 .GetCommandInterpreter()
204 .GetAutoSuggestionForCommand(line);
205 }
206
IOHandlerComplete(IOHandler & io_handler,CompletionRequest & request)207 void IOHandlerDelegate::IOHandlerComplete(IOHandler &io_handler,
208 CompletionRequest &request) {
209 switch (m_completion) {
210 case Completion::None:
211 break;
212 case Completion::LLDBCommand:
213 io_handler.GetDebugger().GetCommandInterpreter().HandleCompletion(request);
214 break;
215 case Completion::Expression:
216 CommandCompletions::InvokeCommonCompletionCallbacks(
217 io_handler.GetDebugger().GetCommandInterpreter(),
218 CommandCompletions::eVariablePathCompletion, request, nullptr);
219 break;
220 }
221 }
222
IOHandlerEditline(Debugger & debugger,IOHandler::Type type,const char * editline_name,llvm::StringRef prompt,llvm::StringRef continuation_prompt,bool multi_line,bool color_prompts,uint32_t line_number_start,IOHandlerDelegate & delegate,repro::DataRecorder * data_recorder)223 IOHandlerEditline::IOHandlerEditline(
224 Debugger &debugger, IOHandler::Type type,
225 const char *editline_name, // Used for saving history files
226 llvm::StringRef prompt, llvm::StringRef continuation_prompt,
227 bool multi_line, bool color_prompts, uint32_t line_number_start,
228 IOHandlerDelegate &delegate, repro::DataRecorder *data_recorder)
229 : IOHandlerEditline(debugger, type,
230 FileSP(), // Inherit input from top input reader
231 StreamFileSP(), // Inherit output from top input reader
232 StreamFileSP(), // Inherit error from top input reader
233 0, // Flags
234 editline_name, // Used for saving history files
235 prompt, continuation_prompt, multi_line, color_prompts,
236 line_number_start, delegate, data_recorder) {}
237
IOHandlerEditline(Debugger & debugger,IOHandler::Type type,const lldb::FileSP & input_sp,const lldb::StreamFileSP & output_sp,const lldb::StreamFileSP & error_sp,uint32_t flags,const char * editline_name,llvm::StringRef prompt,llvm::StringRef continuation_prompt,bool multi_line,bool color_prompts,uint32_t line_number_start,IOHandlerDelegate & delegate,repro::DataRecorder * data_recorder)238 IOHandlerEditline::IOHandlerEditline(
239 Debugger &debugger, IOHandler::Type type, const lldb::FileSP &input_sp,
240 const lldb::StreamFileSP &output_sp, const lldb::StreamFileSP &error_sp,
241 uint32_t flags,
242 const char *editline_name, // Used for saving history files
243 llvm::StringRef prompt, llvm::StringRef continuation_prompt,
244 bool multi_line, bool color_prompts, uint32_t line_number_start,
245 IOHandlerDelegate &delegate, repro::DataRecorder *data_recorder)
246 : IOHandler(debugger, type, input_sp, output_sp, error_sp, flags,
247 data_recorder),
248 #if LLDB_ENABLE_LIBEDIT
249 m_editline_up(),
250 #endif
251 m_delegate(delegate), m_prompt(), m_continuation_prompt(),
252 m_current_lines_ptr(nullptr), m_base_line_number(line_number_start),
253 m_curr_line_idx(UINT32_MAX), m_multi_line(multi_line),
254 m_color_prompts(color_prompts), m_interrupt_exits(true),
255 m_editing(false) {
256 SetPrompt(prompt);
257
258 #if LLDB_ENABLE_LIBEDIT
259 bool use_editline = false;
260
261 use_editline = GetInputFILE() && GetOutputFILE() && GetErrorFILE() &&
262 m_input_sp && m_input_sp->GetIsRealTerminal();
263
264 if (use_editline) {
265 m_editline_up = std::make_unique<Editline>(editline_name, GetInputFILE(),
266 GetOutputFILE(), GetErrorFILE(),
267 m_color_prompts);
268 m_editline_up->SetIsInputCompleteCallback(IsInputCompleteCallback, this);
269 m_editline_up->SetAutoCompleteCallback(AutoCompleteCallback, this);
270 if (debugger.GetUseAutosuggestion() && debugger.GetUseColor())
271 m_editline_up->SetSuggestionCallback(SuggestionCallback, this);
272 // See if the delegate supports fixing indentation
273 const char *indent_chars = delegate.IOHandlerGetFixIndentationCharacters();
274 if (indent_chars) {
275 // The delegate does support indentation, hook it up so when any
276 // indentation character is typed, the delegate gets a chance to fix it
277 m_editline_up->SetFixIndentationCallback(FixIndentationCallback, this,
278 indent_chars);
279 }
280 }
281 #endif
282 SetBaseLineNumber(m_base_line_number);
283 SetPrompt(prompt);
284 SetContinuationPrompt(continuation_prompt);
285 }
286
~IOHandlerEditline()287 IOHandlerEditline::~IOHandlerEditline() {
288 #if LLDB_ENABLE_LIBEDIT
289 m_editline_up.reset();
290 #endif
291 }
292
Activate()293 void IOHandlerEditline::Activate() {
294 IOHandler::Activate();
295 m_delegate.IOHandlerActivated(*this, GetIsInteractive());
296 }
297
Deactivate()298 void IOHandlerEditline::Deactivate() {
299 IOHandler::Deactivate();
300 m_delegate.IOHandlerDeactivated(*this);
301 }
302
TerminalSizeChanged()303 void IOHandlerEditline::TerminalSizeChanged() {
304 #if LLDB_ENABLE_LIBEDIT
305 if (m_editline_up)
306 m_editline_up->TerminalSizeChanged();
307 #endif
308 }
309
310 // Split out a line from the buffer, if there is a full one to get.
SplitLine(std::string & line_buffer)311 static Optional<std::string> SplitLine(std::string &line_buffer) {
312 size_t pos = line_buffer.find('\n');
313 if (pos == std::string::npos)
314 return None;
315 std::string line =
316 std::string(StringRef(line_buffer.c_str(), pos).rtrim("\n\r"));
317 line_buffer = line_buffer.substr(pos + 1);
318 return line;
319 }
320
321 // If the final line of the file ends without a end-of-line, return
322 // it as a line anyway.
SplitLineEOF(std::string & line_buffer)323 static Optional<std::string> SplitLineEOF(std::string &line_buffer) {
324 if (llvm::all_of(line_buffer, llvm::isSpace))
325 return None;
326 std::string line = std::move(line_buffer);
327 line_buffer.clear();
328 return line;
329 }
330
GetLine(std::string & line,bool & interrupted)331 bool IOHandlerEditline::GetLine(std::string &line, bool &interrupted) {
332 #if LLDB_ENABLE_LIBEDIT
333 if (m_editline_up) {
334 bool b = m_editline_up->GetLine(line, interrupted);
335 if (b && m_data_recorder)
336 m_data_recorder->Record(line, true);
337 return b;
338 }
339 #endif
340
341 line.clear();
342
343 if (GetIsInteractive()) {
344 const char *prompt = nullptr;
345
346 if (m_multi_line && m_curr_line_idx > 0)
347 prompt = GetContinuationPrompt();
348
349 if (prompt == nullptr)
350 prompt = GetPrompt();
351
352 if (prompt && prompt[0]) {
353 if (m_output_sp) {
354 m_output_sp->Printf("%s", prompt);
355 m_output_sp->Flush();
356 }
357 }
358 }
359
360 Optional<std::string> got_line = SplitLine(m_line_buffer);
361
362 if (!got_line && !m_input_sp) {
363 // No more input file, we are done...
364 SetIsDone(true);
365 return false;
366 }
367
368 FILE *in = GetInputFILE();
369 char buffer[256];
370
371 if (!got_line && !in && m_input_sp) {
372 // there is no FILE*, fall back on just reading bytes from the stream.
373 while (!got_line) {
374 size_t bytes_read = sizeof(buffer);
375 Status error = m_input_sp->Read((void *)buffer, bytes_read);
376 if (error.Success() && !bytes_read) {
377 got_line = SplitLineEOF(m_line_buffer);
378 break;
379 }
380 if (error.Fail())
381 break;
382 m_line_buffer += StringRef(buffer, bytes_read);
383 got_line = SplitLine(m_line_buffer);
384 }
385 }
386
387 if (!got_line && in) {
388 m_editing = true;
389 while (!got_line) {
390 char *r = fgets(buffer, sizeof(buffer), in);
391 #ifdef _WIN32
392 // ReadFile on Windows is supposed to set ERROR_OPERATION_ABORTED
393 // according to the docs on MSDN. However, this has evidently been a
394 // known bug since Windows 8. Therefore, we can't detect if a signal
395 // interrupted in the fgets. So pressing ctrl-c causes the repl to end
396 // and the process to exit. A temporary workaround is just to attempt to
397 // fgets twice until this bug is fixed.
398 if (r == nullptr)
399 r = fgets(buffer, sizeof(buffer), in);
400 // this is the equivalent of EINTR for Windows
401 if (r == nullptr && GetLastError() == ERROR_OPERATION_ABORTED)
402 continue;
403 #endif
404 if (r == nullptr) {
405 if (ferror(in) && errno == EINTR)
406 continue;
407 if (feof(in))
408 got_line = SplitLineEOF(m_line_buffer);
409 break;
410 }
411 m_line_buffer += buffer;
412 got_line = SplitLine(m_line_buffer);
413 }
414 m_editing = false;
415 }
416
417 if (got_line) {
418 line = got_line.getValue();
419 if (m_data_recorder)
420 m_data_recorder->Record(line, true);
421 }
422
423 return (bool)got_line;
424 }
425
426 #if LLDB_ENABLE_LIBEDIT
IsInputCompleteCallback(Editline * editline,StringList & lines,void * baton)427 bool IOHandlerEditline::IsInputCompleteCallback(Editline *editline,
428 StringList &lines,
429 void *baton) {
430 IOHandlerEditline *editline_reader = (IOHandlerEditline *)baton;
431 return editline_reader->m_delegate.IOHandlerIsInputComplete(*editline_reader,
432 lines);
433 }
434
FixIndentationCallback(Editline * editline,const StringList & lines,int cursor_position,void * baton)435 int IOHandlerEditline::FixIndentationCallback(Editline *editline,
436 const StringList &lines,
437 int cursor_position,
438 void *baton) {
439 IOHandlerEditline *editline_reader = (IOHandlerEditline *)baton;
440 return editline_reader->m_delegate.IOHandlerFixIndentation(
441 *editline_reader, lines, cursor_position);
442 }
443
444 llvm::Optional<std::string>
SuggestionCallback(llvm::StringRef line,void * baton)445 IOHandlerEditline::SuggestionCallback(llvm::StringRef line, void *baton) {
446 IOHandlerEditline *editline_reader = static_cast<IOHandlerEditline *>(baton);
447 if (editline_reader)
448 return editline_reader->m_delegate.IOHandlerSuggestion(*editline_reader,
449 line);
450
451 return llvm::None;
452 }
453
AutoCompleteCallback(CompletionRequest & request,void * baton)454 void IOHandlerEditline::AutoCompleteCallback(CompletionRequest &request,
455 void *baton) {
456 IOHandlerEditline *editline_reader = (IOHandlerEditline *)baton;
457 if (editline_reader)
458 editline_reader->m_delegate.IOHandlerComplete(*editline_reader, request);
459 }
460 #endif
461
GetPrompt()462 const char *IOHandlerEditline::GetPrompt() {
463 #if LLDB_ENABLE_LIBEDIT
464 if (m_editline_up) {
465 return m_editline_up->GetPrompt();
466 } else {
467 #endif
468 if (m_prompt.empty())
469 return nullptr;
470 #if LLDB_ENABLE_LIBEDIT
471 }
472 #endif
473 return m_prompt.c_str();
474 }
475
SetPrompt(llvm::StringRef prompt)476 bool IOHandlerEditline::SetPrompt(llvm::StringRef prompt) {
477 m_prompt = std::string(prompt);
478
479 #if LLDB_ENABLE_LIBEDIT
480 if (m_editline_up)
481 m_editline_up->SetPrompt(m_prompt.empty() ? nullptr : m_prompt.c_str());
482 #endif
483 return true;
484 }
485
GetContinuationPrompt()486 const char *IOHandlerEditline::GetContinuationPrompt() {
487 return (m_continuation_prompt.empty() ? nullptr
488 : m_continuation_prompt.c_str());
489 }
490
SetContinuationPrompt(llvm::StringRef prompt)491 void IOHandlerEditline::SetContinuationPrompt(llvm::StringRef prompt) {
492 m_continuation_prompt = std::string(prompt);
493
494 #if LLDB_ENABLE_LIBEDIT
495 if (m_editline_up)
496 m_editline_up->SetContinuationPrompt(m_continuation_prompt.empty()
497 ? nullptr
498 : m_continuation_prompt.c_str());
499 #endif
500 }
501
SetBaseLineNumber(uint32_t line)502 void IOHandlerEditline::SetBaseLineNumber(uint32_t line) {
503 m_base_line_number = line;
504 }
505
GetCurrentLineIndex() const506 uint32_t IOHandlerEditline::GetCurrentLineIndex() const {
507 #if LLDB_ENABLE_LIBEDIT
508 if (m_editline_up)
509 return m_editline_up->GetCurrentLine();
510 #endif
511 return m_curr_line_idx;
512 }
513
GetLines(StringList & lines,bool & interrupted)514 bool IOHandlerEditline::GetLines(StringList &lines, bool &interrupted) {
515 m_current_lines_ptr = &lines;
516
517 bool success = false;
518 #if LLDB_ENABLE_LIBEDIT
519 if (m_editline_up) {
520 return m_editline_up->GetLines(m_base_line_number, lines, interrupted);
521 } else {
522 #endif
523 bool done = false;
524 Status error;
525
526 while (!done) {
527 // Show line numbers if we are asked to
528 std::string line;
529 if (m_base_line_number > 0 && GetIsInteractive()) {
530 if (m_output_sp) {
531 m_output_sp->Printf("%u%s",
532 m_base_line_number + (uint32_t)lines.GetSize(),
533 GetPrompt() == nullptr ? " " : "");
534 }
535 }
536
537 m_curr_line_idx = lines.GetSize();
538
539 bool interrupted = false;
540 if (GetLine(line, interrupted) && !interrupted) {
541 lines.AppendString(line);
542 done = m_delegate.IOHandlerIsInputComplete(*this, lines);
543 } else {
544 done = true;
545 }
546 }
547 success = lines.GetSize() > 0;
548 #if LLDB_ENABLE_LIBEDIT
549 }
550 #endif
551 return success;
552 }
553
554 // Each IOHandler gets to run until it is done. It should read data from the
555 // "in" and place output into "out" and "err and return when done.
Run()556 void IOHandlerEditline::Run() {
557 std::string line;
558 while (IsActive()) {
559 bool interrupted = false;
560 if (m_multi_line) {
561 StringList lines;
562 if (GetLines(lines, interrupted)) {
563 if (interrupted) {
564 m_done = m_interrupt_exits;
565 m_delegate.IOHandlerInputInterrupted(*this, line);
566
567 } else {
568 line = lines.CopyList();
569 m_delegate.IOHandlerInputComplete(*this, line);
570 }
571 } else {
572 m_done = true;
573 }
574 } else {
575 if (GetLine(line, interrupted)) {
576 if (interrupted)
577 m_delegate.IOHandlerInputInterrupted(*this, line);
578 else
579 m_delegate.IOHandlerInputComplete(*this, line);
580 } else {
581 m_done = true;
582 }
583 }
584 }
585 }
586
Cancel()587 void IOHandlerEditline::Cancel() {
588 #if LLDB_ENABLE_LIBEDIT
589 if (m_editline_up)
590 m_editline_up->Cancel();
591 #endif
592 }
593
Interrupt()594 bool IOHandlerEditline::Interrupt() {
595 // Let the delgate handle it first
596 if (m_delegate.IOHandlerInterrupt(*this))
597 return true;
598
599 #if LLDB_ENABLE_LIBEDIT
600 if (m_editline_up)
601 return m_editline_up->Interrupt();
602 #endif
603 return false;
604 }
605
GotEOF()606 void IOHandlerEditline::GotEOF() {
607 #if LLDB_ENABLE_LIBEDIT
608 if (m_editline_up)
609 m_editline_up->Interrupt();
610 #endif
611 }
612
PrintAsync(Stream * stream,const char * s,size_t len)613 void IOHandlerEditline::PrintAsync(Stream *stream, const char *s, size_t len) {
614 #if LLDB_ENABLE_LIBEDIT
615 if (m_editline_up)
616 m_editline_up->PrintAsync(stream, s, len);
617 else
618 #endif
619 {
620 #ifdef _WIN32
621 const char *prompt = GetPrompt();
622 if (prompt) {
623 // Back up over previous prompt using Windows API
624 CONSOLE_SCREEN_BUFFER_INFO screen_buffer_info;
625 HANDLE console_handle = GetStdHandle(STD_OUTPUT_HANDLE);
626 GetConsoleScreenBufferInfo(console_handle, &screen_buffer_info);
627 COORD coord = screen_buffer_info.dwCursorPosition;
628 coord.X -= strlen(prompt);
629 if (coord.X < 0)
630 coord.X = 0;
631 SetConsoleCursorPosition(console_handle, coord);
632 }
633 #endif
634 IOHandler::PrintAsync(stream, s, len);
635 #ifdef _WIN32
636 if (prompt)
637 IOHandler::PrintAsync(GetOutputStreamFileSP().get(), prompt,
638 strlen(prompt));
639 #endif
640 }
641 }
642