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Fix a bug in handling ^C at the "y/n/a" completion prompt. #67621

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Fix a bug in handling ^C at the "y/n/a" completion prompt. #67621

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4 changes: 4 additions & 0 deletions lldb/include/lldb/Host/Editline.h
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Original file line number Diff line number Diff line change
Expand Up @@ -161,6 +161,10 @@ class Editline {
/// of Editline.
static Editline *InstanceFor(::EditLine *editline);

static void
DisplayCompletions(Editline &editline,
llvm::ArrayRef<CompletionResult::Completion> results);

/// Sets a string to be used as a prompt, or combined with a line number to
/// form a prompt.
void SetPrompt(const char *prompt);
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28 changes: 18 additions & 10 deletions lldb/source/Host/common/Editline.cpp
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Expand Up @@ -943,12 +943,12 @@ PrintCompletion(FILE *output_file,
}
}

static void
DisplayCompletions(::EditLine *editline, FILE *output_file,
llvm::ArrayRef<CompletionResult::Completion> results) {
void Editline::DisplayCompletions(
Editline &editline, llvm::ArrayRef<CompletionResult::Completion> results) {
assert(!results.empty());

fprintf(output_file, "\n" ANSI_CLEAR_BELOW "Available completions:\n");
fprintf(editline.m_output_file,
"\n" ANSI_CLEAR_BELOW "Available completions:\n");
const size_t page_size = 40;
bool all = false;

Expand All @@ -960,7 +960,7 @@ DisplayCompletions(::EditLine *editline, FILE *output_file,
const size_t max_len = longest->GetCompletion().size();

if (results.size() < page_size) {
PrintCompletion(output_file, results, max_len);
PrintCompletion(editline.m_output_file, results, max_len);
return;
}

Expand All @@ -969,17 +969,25 @@ DisplayCompletions(::EditLine *editline, FILE *output_file,
size_t remaining = results.size() - cur_pos;
size_t next_size = all ? remaining : std::min(page_size, remaining);

PrintCompletion(output_file, results.slice(cur_pos, next_size), max_len);
PrintCompletion(editline.m_output_file, results.slice(cur_pos, next_size),
max_len);

cur_pos += next_size;

if (cur_pos >= results.size())
break;

fprintf(output_file, "More (Y/n/a): ");
fprintf(editline.m_output_file, "More (Y/n/a): ");
char reply = 'n';
int got_char = el_getc(editline, &reply);
fprintf(output_file, "\n");
int got_char = el_getc(editline.m_editline, &reply);
// Check for a ^C or other interruption.
if (editline.m_editor_status == EditorStatus::Interrupted) {
editline.m_editor_status = EditorStatus::Editing;
fprintf(editline.m_output_file, "^C\n");
break;
}

fprintf(editline.m_output_file, "\n");
if (got_char == -1 || reply == 'n')
break;
if (reply == 'a')
Expand Down Expand Up @@ -1050,7 +1058,7 @@ unsigned char Editline::TabCommand(int ch) {
return CC_REDISPLAY;
}

DisplayCompletions(m_editline, m_output_file, results);
DisplayCompletions(*this, results);

DisplayInput();
MoveCursor(CursorLocation::BlockEnd, CursorLocation::EditingCursor);
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6 changes: 6 additions & 0 deletions lldb/test/API/iohandler/completion/TestIOHandlerCompletion.py
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Expand Up @@ -75,6 +75,12 @@ def test_completion(self):
self.child.send("n")
self.expect_prompt()

# Start tab completion and abort showing more commands with '^C'.
self.child.send("\t")
self.child.expect_exact("More (Y/n/a)")
self.child.sendcontrol('c')
self.expect_prompt()

# Shouldn't crash or anything like that.
self.child.send("regoinvalid\t")
self.expect_prompt()
Expand Down