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// Copyright (c) 2016 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "Privilege check" project.
// For details, see https://github.com/egor-tensin/privilege-check.
// Distributed under the MIT License.
#pragma once
#include "error.hpp"
#include "string.hpp"
#include <Windows.h>
#include <shellapi.h>
#include <cstddef>
#include <memory>
#include <stdexcept>
#include <sstream>
#include <string>
#include <utility>
#include <vector>
class CommandLine
{
public:
static CommandLine query()
{
return build_from_string(GetCommandLine());
}
static CommandLine build_from_main(int argc, wchar_t* argv[])
{
if (argc < 1)
throw std::range_error{"invalid argc value"};
std::wstring argv0{argv[0]};
--argc;
++argv;
std::vector<std::wstring> args;
args.reserve(argc);
for (int i = 0; i < argc; ++i)
args.emplace_back(argv[i]);
return {std::move(argv0), std::move(args)};
}
CommandLine() = default;
bool has_argv0() const
{
return !argv0.empty();
}
std::wstring get_argv0() const
{
return argv0;
}
std::wstring escape_argv0() const
{
return escape(get_argv0());
}
bool has_args() const
{
return !get_args().empty();
}
const std::vector<std::wstring>& get_args() const
{
return args;
}
std::vector<std::wstring> escape_args() const
{
std::vector<std::wstring> safe;
safe.reserve(args.size());
for (const auto& arg : args)
safe.emplace_back(escape(arg));
return safe;
}
static constexpr wchar_t sep() { return L' '; }
std::wstring join_args() const
{
return string::join(sep(), escape_args());
}
std::wstring join() const
{
if (!has_argv0())
throw std::logic_error{"argv[0] isn't defined"};
std::wostringstream oss;
oss << escape_argv0();
if (has_args())
oss << sep() << string::join(sep(), escape_args());
return oss.str();
}
private:
static CommandLine build_from_string(std::wstring src)
{
string::trim(src);
if (src.empty())
return {};
int argc = 0;
std::unique_ptr<wchar_t*, LocalDelete> argv{CommandLineToArgvW(src.c_str(), &argc)};
if (argv.get() == NULL)
error::raise("CommandLineToArgvW");
if (argc == 0)
return {};
std::wstring argv0{argv.get()[0]};
std::vector<std::wstring> args;
args.reserve(argc - 1);
for (int i = 1; i < argc; ++i)
args.emplace_back(argv.get()[i]);
return {std::move(argv0), std::move(args)};
}
inline std::wstring escape_for_cmd(const std::wstring& arg)
{
static constexpr auto escape_symbol = L'^';
static constexpr auto dangerous_symbols = L"!\"%&()<>^|";
auto safe = escape(arg);
string::prefix_with(safe, dangerous_symbols, escape_symbol);
return safe;
}
static std::wstring escape(const std::wstring& arg)
{
std::wstring safe;
safe.reserve(arg.length() + 2);
safe.push_back(L'"');
for (auto it = arg.cbegin(); it != arg.cend(); ++it)
{
std::size_t numof_backslashes = 0;
for (; it != arg.cend() && *it == L'\\'; ++it)
++numof_backslashes;
if (it == arg.cend())
{
safe.reserve(safe.capacity() + numof_backslashes);
safe.append(2 * numof_backslashes, L'\\');
break;
}
switch (*it)
{
case L'"':
safe.reserve(safe.capacity() + numof_backslashes + 1);
safe.append(2 * numof_backslashes + 1, L'\\');
break;
default:
safe.append(numof_backslashes, L'\\');
break;
}
safe.push_back(*it);
}
safe.push_back(L'"');
return safe;
}
struct LocalDelete
{
void operator()(wchar_t* argv[]) const
{
LocalFree(argv);
}
};
CommandLine(std::vector<std::wstring>&& args)
: args{std::move(args)}
{ }
CommandLine(std::wstring&& argv0, std::vector<std::wstring>&& args = {})
: argv0{std::move(argv0)}
, args{std::move(args)}
{ }
const std::wstring argv0;
const std::vector<std::wstring> args;
};
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