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//===--------------------- TildeExpressionResolver.cpp ----------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "lldb/Utility/TildeExpressionResolver.h"
#include <assert.h>
#include <system_error>
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
#if !defined(_WIN32)
#include <pwd.h>
#endif
using namespace lldb_private;
using namespace llvm;
namespace fs = llvm::sys::fs;
namespace path = llvm::sys::path;
TildeExpressionResolver::~TildeExpressionResolver() {}
bool StandardTildeExpressionResolver::ResolveExact(
StringRef Expr, SmallVectorImpl<char> &Output) {
// We expect the tilde expression to be ONLY the expression itself, and
// contain no separators.
assert(!llvm::any_of(Expr, [](char c) { return path::is_separator(c); }));
assert(Expr.empty() || Expr[0] == '~');
return !fs::real_path(Expr, Output, true);
}
bool StandardTildeExpressionResolver::ResolvePartial(StringRef Expr,
StringSet<> &Output) {
// We expect the tilde expression to be ONLY the expression itself, and
// contain no separators.
assert(!llvm::any_of(Expr, [](char c) { return path::is_separator(c); }));
assert(Expr.empty() || Expr[0] == '~');
Output.clear();
#if defined(_WIN32) || defined(__ANDROID__)
return false;
#else
if (Expr.empty())
return false;
SmallString<32> Buffer("~");
setpwent();
struct passwd *user_entry;
Expr = Expr.drop_front();
while ((user_entry = getpwent()) != nullptr) {
StringRef ThisName(user_entry->pw_name);
if (!ThisName.startswith(Expr))
continue;
Buffer.resize(1);
Buffer.append(ThisName);
Buffer.append(path::get_separator());
Output.insert(Buffer);
}
return true;
#endif
}
bool TildeExpressionResolver::ResolveFullPath(
StringRef Expr, llvm::SmallVectorImpl<char> &Output) {
Output.clear();
if (!Expr.startswith("~")) {
Output.append(Expr.begin(), Expr.end());
return false;
}
namespace path = llvm::sys::path;
StringRef Left =
Expr.take_until([](char c) { return path::is_separator(c); });
if (!ResolveExact(Left, Output))
return false;
Output.append(Expr.begin() + Left.size(), Expr.end());
return true;
}
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