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// Copyright (c) 2020 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "winapi-common" project.
// For details, see https://github.com/egor-tensin/winapi-common.
// Distributed under the MIT License.
#include <winapi/cmd_line.hpp>
#include <winapi/error.hpp>
#include <winapi/process.hpp>
#include <winapi/resource.hpp>
#include <winapi/utf8.hpp>
#include <boost/config.hpp>
#include <windows.h>
#include <cstddef>
#include <cstring>
#include <sstream>
#include <stdexcept>
#include <string>
#include <utility>
#include <vector>
namespace winapi {
namespace {
typedef std::vector<wchar_t> EscapedCommandLine;
Handle create_process(EscapedCommandLine cmd_line, Process::IO& io) {
BOOST_STATIC_CONSTEXPR DWORD flags = /*CREATE_NO_WINDOW | */ CREATE_UNICODE_ENVIRONMENT;
STARTUPINFOW startup_info;
std::memset(&startup_info, 0, sizeof(startup_info));
startup_info.cb = sizeof(startup_info);
startup_info.dwFlags = STARTF_USESTDHANDLES;
startup_info.hStdInput = static_cast<HANDLE>(io.std_in.handle);
startup_info.hStdOutput = static_cast<HANDLE>(io.std_out.handle);
startup_info.hStdError = static_cast<HANDLE>(io.std_err.handle);
PROCESS_INFORMATION child_info;
std::memset(&child_info, 0, sizeof(child_info));
const auto ret = ::CreateProcessW(
NULL, cmd_line.data(), NULL, NULL, TRUE, flags, NULL, NULL, &startup_info, &child_info);
if (!ret) {
throw error::windows(GetLastError(), "CreateProcessW");
}
io.close();
Handle process{child_info.hProcess};
Handle thread{child_info.hThread};
return std::move(process);
}
EscapedCommandLine escape_command_line(const CommandLine& cmd_line) {
const auto unicode_cmd_line = widen(cmd_line.to_string());
EscapedCommandLine buffer;
buffer.reserve(unicode_cmd_line.size() + 1);
buffer.assign(unicode_cmd_line.cbegin(), unicode_cmd_line.cend());
buffer.emplace_back(L'\0');
return buffer;
}
Handle create_process(const CommandLine& cmd_line, Process::IO& io) {
return create_process(escape_command_line(cmd_line), io);
}
} // namespace
void Process::IO::close() {
std_in.handle.close();
std_out.handle.close();
std_err.handle.close();
}
Process Process::create(const CommandLine& cmd_line) {
return create(cmd_line, {});
}
Process Process::create(const CommandLine& cmd_line, IO io) {
return Process{create_process(cmd_line, io)};
}
void Process::wait() const {
const auto ret = ::WaitForSingleObject(static_cast<HANDLE>(m_handle), INFINITE);
switch (ret) {
case WAIT_OBJECT_0:
return;
case WAIT_FAILED:
throw error::windows(GetLastError(), "WaitForSingleObject");
default:
// Shouldn't happen.
throw error::custom(ret, "WaitForSingleObject");
}
}
int Process::get_exit_code() const {
DWORD ec = 0;
const auto ret = ::GetExitCodeProcess(static_cast<HANDLE>(m_handle), &ec);
if (!ret) {
throw error::windows(GetLastError(), "GetExitCodeProcess");
}
if (ec == STILL_ACTIVE) {
throw std::runtime_error{"Attempted to query the exit code of a running process"};
}
return static_cast<int>(ec);
}
HMODULE Process::get_exe_module() {
const auto module = ::GetModuleHandleW(NULL);
if (module == NULL) {
throw error::windows(GetLastError(), "GetModuleHandleW");
}
return module;
}
std::string Process::get_exe_path() {
BOOST_STATIC_CONSTEXPR std::size_t init_buffer_size = MAX_PATH;
static_assert(init_buffer_size > 0, "init_buffer_size must be positive");
std::vector<wchar_t> buffer;
buffer.resize(init_buffer_size);
while (true) {
SetLastError(ERROR_SUCCESS);
const auto nch = ::GetModuleFileNameW(NULL, buffer.data(), buffer.size());
if (nch == 0) {
throw error::windows(GetLastError(), "GetModuleFileNameW");
}
if (nch == buffer.size() && GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
buffer.resize(2 * buffer.size());
continue;
}
buffer.resize(nch);
return narrow(buffer);
}
}
std::string Process::get_resource_string(unsigned int id) {
wchar_t* s = nullptr;
const auto nch = ::LoadStringW(get_exe_module(), id, reinterpret_cast<wchar_t*>(&s), 0);
if (nch <= 0) {
throw error::windows(GetLastError(), "LoadStringW");
}
return narrow(s, nch * sizeof(wchar_t));
}
Resource Process::get_resource(unsigned int id) {
const auto module = get_exe_module();
const auto src = ::FindResourceA(module, MAKEINTRESOURCEA(id), RT_RCDATA);
if (src == NULL) {
throw error::windows(GetLastError(), "FindResourceA");
}
const auto resource = ::LoadResource(module, src);
if (resource == NULL) {
throw error::windows(GetLastError(), "LoadResource");
}
const auto data = ::LockResource(resource);
if (data == NULL) {
std::ostringstream oss;
oss << "Couldn't get data pointer for resource with ID " << id;
throw std::runtime_error{oss.str()};
}
const auto nb = ::SizeofResource(module, src);
return {data, nb};
}
} // namespace winapi
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