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
9#include "lldb/Utility/TildeExpressionResolver.h"
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
30TildeExpressionResolver::~TildeExpressionResolver() = default;
31
32bool StandardTildeExpressionResolver::ResolveExact(
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(path: Expr, output&: Output, expand_tilde: true);
40}
41
42bool StandardTildeExpressionResolver::ResolvePartial(StringRef Expr,
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.starts_with(Prefix: Expr))
64 continue;
65
66 Buffer.resize(N: 1);
67 Buffer.append(RHS: ThisName);
68 Buffer.append(RHS: path::get_separator());
69 Output.insert(key: Buffer);
70 }
71
72 return true;
73#endif
74}
75
76bool TildeExpressionResolver::ResolveFullPath(
77 StringRef Expr, llvm::SmallVectorImpl<char> &Output) {
78 if (!Expr.starts_with(Prefix: "~")) {
79 Output.assign(in_start: Expr.begin(), in_end: Expr.end());
80 return false;
81 }
82
83 namespace path = llvm::sys::path;
84 StringRef Left =
85 Expr.take_until(F: [](char c) { return path::is_separator(value: c); });
86
87 if (!ResolveExact(Expr: Left, Output)) {
88 Output.assign(in_start: Expr.begin(), in_end: Expr.end());
89 return false;
90 }
91
92 Output.append(in_start: Expr.begin() + Left.size(), in_end: Expr.end());
93 return true;
94}
95

source code of lldb/source/Utility/TildeExpressionResolver.cpp