LLDB mainline
TildeExpressionResolver.cpp
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1//===-- TildeExpressionResolver.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
10
11#include <cassert>
12#include <system_error>
13
14#include "llvm/ADT/STLExtras.h"
15#include "llvm/ADT/SmallVector.h"
16#include "llvm/Support/FileSystem.h"
17#include "llvm/Support/Path.h"
18#include "llvm/Support/raw_ostream.h"
19
20#if !defined(_WIN32)
21#include <pwd.h>
22#endif
23
24using namespace lldb_private;
25using namespace llvm;
26
27namespace fs = llvm::sys::fs;
28namespace path = llvm::sys::path;
29
31
33 StringRef Expr, SmallVectorImpl<char> &Output) {
34 // We expect the tilde expression to be ONLY the expression itself, and
35 // contain no separators.
36 assert(!llvm::any_of(Expr, [](char c) { return path::is_separator(c); }));
37 assert(Expr.empty() || Expr[0] == '~');
38
39 return !fs::real_path(Expr, Output, true);
40}
41
43 StringSet<> &Output) {
44 // We expect the tilde expression to be ONLY the expression itself, and
45 // contain no separators.
46 assert(!llvm::any_of(Expr, [](char c) { return path::is_separator(c); }));
47 assert(Expr.empty() || Expr[0] == '~');
48
49 Output.clear();
50#if defined(_WIN32) || defined(__ANDROID__)
51 return false;
52#else
53 if (Expr.empty())
54 return false;
55
56 SmallString<32> Buffer("~");
57 setpwent();
58 struct passwd *user_entry;
59 Expr = Expr.drop_front();
60
61 while ((user_entry = getpwent()) != nullptr) {
62 StringRef ThisName(user_entry->pw_name);
63 if (!ThisName.startswith(Expr))
64 continue;
65
66 Buffer.resize(1);
67 Buffer.append(ThisName);
68 Buffer.append(path::get_separator());
69 Output.insert(Buffer);
70 }
71
72 return true;
73#endif
74}
75
77 StringRef Expr, llvm::SmallVectorImpl<char> &Output) {
78 if (!Expr.startswith("~")) {
79 Output.assign(Expr.begin(), Expr.end());
80 return false;
81 }
82
83 namespace path = llvm::sys::path;
84 StringRef Left =
85 Expr.take_until([](char c) { return path::is_separator(c); });
86
87 if (!ResolveExact(Left, Output)) {
88 Output.assign(Expr.begin(), Expr.end());
89 return false;
90 }
91
92 Output.append(Expr.begin() + Left.size(), Expr.end());
93 return true;
94}
bool ResolvePartial(llvm::StringRef Expr, llvm::StringSet<> &Output) override
Auto-complete a tilde expression with all matching values.
bool ResolveExact(llvm::StringRef Expr, llvm::SmallVectorImpl< char > &Output) override
Resolve a Tilde Expression contained according to bash rules.
bool ResolveFullPath(llvm::StringRef Expr, llvm::SmallVectorImpl< char > &Output)
Resolve an entire path that begins with a tilde expression, replacing the username portion with the m...
virtual bool ResolveExact(llvm::StringRef Expr, llvm::SmallVectorImpl< char > &Output)=0
Resolve a Tilde Expression contained according to bash rules.
A class that represents a running process on the host machine.
Definition: SBAttachInfo.h:14
Definition: Debugger.h:52