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v/vlib/os/os_windows.v

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module os
#flag -lws2_32
#include <winsock2.h>
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pub const (
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path_separator = '\\'
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)
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// Ref - https://docs.microsoft.com/en-us/windows/desktop/winprog/windows-data-types
// A handle to an object.
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type HANDLE voidptr
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// win: FILETIME
// https://docs.microsoft.com/en-us/windows/win32/api/minwinbase/ns-minwinbase-filetime
struct Filetime {
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dwLowDateTime u32
dwHighDateTime u32
}
// win: WIN32_FIND_DATA
// https://docs.microsoft.com/en-us/windows/win32/api/minwinbase/ns-minwinbase-_win32_find_dataw
struct Win32finddata {
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mut:
dwFileAttributes u32
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ftCreationTime Filetime
ftLastAccessTime Filetime
ftLastWriteTime Filetime
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nFileSizeHigh u32
nFileSizeLow u32
dwReserved0 u32
dwReserved1 u32
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cFileName [260]u16 // MAX_PATH = 260
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cAlternateFileName [14]u16 // 14
dwFileType u32
dwCreatorType u32
wFinderFlags u16
}
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struct ProcessInformation {
mut:
hProcess voidptr
hThread voidptr
dwProcessId u32
dwThreadId u32
}
struct StartupInfo {
mut:
cb u32
lpReserved &u16
lpDesktop &u16
lpTitle &u16
dwX u32
dwY u32
dwXSize u32
dwYSize u32
dwXCountChars u32
dwYCountChars u32
dwFillAttribute u32
dwFlags u32
wShowWindow u16
cbReserved2 u16
lpReserved2 byteptr
hStdInput voidptr
hStdOutput voidptr
hStdError voidptr
}
struct SecurityAttributes {
mut:
nLength u32
lpSecurityDescriptor voidptr
bInheritHandle bool
}
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fn init_os_args(argc int, argv &byteptr) []string {
mut args := []string
mut args_list := &voidptr(0)
mut args_count := 0
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args_list = &voidptr(C.CommandLineToArgvW(C.GetCommandLine(), &args_count))
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for i := 0; i < args_count; i++ {
args << string_from_wide(&u16(args_list[i]))
}
C.LocalFree(args_list)
return args
}
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pub fn ls(path string) ?[]string {
mut find_file_data := Win32finddata{}
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mut dir_files := []string
// We can also check if the handle is valid. but using dir_exists instead
// h_find_dir := C.FindFirstFile(path.str, &find_file_data)
// if (INVALID_HANDLE_VALUE == h_find_dir) {
// return dir_files
// }
// C.FindClose(h_find_dir)
if !dir_exists(path) {
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return error('ls() couldnt open dir "$path": directory does not exist')
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}
// NOTE: Should eventually have path struct & os dependant path seperator (eg os.PATH_SEPERATOR)
// we need to add files to path eg. c:\windows\*.dll or :\windows\*
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path_files := '$path\\*'
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// NOTE:TODO: once we have a way to convert utf16 wide character to utf8
// we should use FindFirstFileW and FindNextFileW
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h_find_files := C.FindFirstFile(path_files.to_wide(), voidptr(&find_file_data))
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first_filename := string_from_wide(&u16(find_file_data.cFileName))
if first_filename != '.' && first_filename != '..' {
dir_files << first_filename
}
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for C.FindNextFile(h_find_files, voidptr(&find_file_data)) {
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filename := string_from_wide(&u16(find_file_data.cFileName))
if filename != '.' && filename != '..' {
dir_files << filename.clone()
}
}
C.FindClose(h_find_files)
return dir_files
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}
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pub fn dir_exists(path string) bool {
_path := path.replace('/', '\\')
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attr := C.GetFileAttributesW(_path.to_wide())
if int(attr) == int(C.INVALID_FILE_ATTRIBUTES) {
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return false
}
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if (int(attr) & C.FILE_ATTRIBUTE_DIRECTORY) != 0 {
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return true
}
return false
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}
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// mkdir creates a new directory with the specified path.
pub fn mkdir(path string) {
_path := path.replace('/', '\\')
// Windows doesnt recursively create the folders
// so we need to help it out here
if _path.last_index('\\') != -1 {
mkdir(_path.all_before_last('\\'))
}
C.CreateDirectory(_path.to_wide(), 0)
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}
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// Ref - https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/get-osfhandle?view=vs-2019
// get_file_handle retrieves the operating-system file handle that is associated with the specified file descriptor.
pub fn get_file_handle(path string) HANDLE {
mode := 'rb'
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_fd := C._wfopen(path.to_wide(), mode.to_wide())
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if _fd == 0 {
return HANDLE(INVALID_HANDLE_VALUE)
}
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_handle := HANDLE(C._get_osfhandle(C._fileno(_fd))) // CreateFile? - hah, no -_-
return _handle
}
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// Ref - https://docs.microsoft.com/en-us/windows/win32/api/libloaderapi/nf-libloaderapi-getmodulefilenamea
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// get_module_filename retrieves the fully qualified path for the file that contains the specified module.
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// The module must have been loaded by the current process.
pub fn get_module_filename(handle HANDLE) ?string {
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mut sz := int(4096) // Optimized length
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mut buf := &u16(malloc(4096))
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for {
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status := int(C.GetModuleFileNameW(handle, voidptr(&buf), sz))
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match status {
SUCCESS {
_filename := string_from_wide2(buf, sz)
return _filename
}
else {
// Must handled with GetLastError and converted by FormatMessage
return error('Cannot get file name from handle')
}
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}
}
panic('this should be unreachable') // TODO remove unreachable after loop
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}
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// Ref - https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-formatmessagea#parameters
const (
FORMAT_MESSAGE_ALLOCATE_BUFFER = 0x00000100
FORMAT_MESSAGE_ARGUMENT_ARRAY = 0x00002000
FORMAT_MESSAGE_FROM_HMODULE = 0x00000800
FORMAT_MESSAGE_FROM_STRING = 0x00000400
FORMAT_MESSAGE_FROM_SYSTEM = 0x00001000
FORMAT_MESSAGE_IGNORE_INSERTS = 0x00000200
)
// Ref - winnt.h
const (
SUBLANG_NEUTRAL = 0x00
SUBLANG_DEFAULT = 0x01
LANG_NEUTRAL = (SUBLANG_NEUTRAL)
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)
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// Ref - https://docs.microsoft.com/en-us/windows/win32/debug/system-error-codes--12000-15999-
const (
MAX_ERROR_CODE = 15841 // ERROR_API_UNAVAILABLE
)
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// ptr_win_get_error_msg return string (voidptr)
// representation of error, only for windows.
fn ptr_win_get_error_msg(code u32) voidptr {
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mut buf := voidptr(0)
// Check for code overflow
if code > u32(MAX_ERROR_CODE) {
return buf
}
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C.FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER
| FORMAT_MESSAGE_FROM_SYSTEM
| FORMAT_MESSAGE_IGNORE_INSERTS,
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0, code, C.MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), voidptr(&buf), 0, 0)
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return buf
}
// get_error_msg return error code representation in string.
pub fn get_error_msg(code int) string {
if code < 0 { // skip negative
return ''
}
_ptr_text := ptr_win_get_error_msg(u32(code))
if _ptr_text == 0 { // compare with null
return ''
}
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return string_from_wide(_ptr_text)
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}
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// exec starts the specified command, waits for it to complete, and returns its output.
pub fn exec(cmd string) ?Result {
if cmd.contains(';') || cmd.contains('&&') || cmd.contains('||') || cmd.contains('\n') {
return error(';, &&, || and \\n are not allowed in shell commands')
}
mut child_stdin := &u32(0)
mut child_stdout_read := &u32(0)
mut child_stdout_write := &u32(0)
mut sa := SecurityAttributes {}
sa.nLength = sizeof(C.SECURITY_ATTRIBUTES)
sa.bInheritHandle = true
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create_pipe_result := int(C.CreatePipe(voidptr(&child_stdout_read), voidptr(&child_stdout_write), voidptr(&sa), 0))
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if create_pipe_result == 0 {
error_msg := get_error_msg(int(C.GetLastError()))
return error('exec failed (CreatePipe): $error_msg')
}
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set_handle_info_result := int(C.SetHandleInformation(child_stdout_read, C.HANDLE_FLAG_INHERIT, 0))
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if set_handle_info_result == 0 {
error_msg := get_error_msg(int(C.GetLastError()))
panic('exec failed (SetHandleInformation): $error_msg')
}
proc_info := ProcessInformation{}
mut start_info := StartupInfo{}
start_info.cb = sizeof(C.PROCESS_INFORMATION)
start_info.hStdInput = child_stdin
start_info.hStdOutput = child_stdout_write
start_info.hStdError = child_stdout_write
start_info.dwFlags = u32(C.STARTF_USESTDHANDLES)
command_line := [32768]u16
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C.ExpandEnvironmentStringsW(cmd.to_wide(), voidptr(&command_line), 32768)
create_process_result := int(C.CreateProcessW(0, command_line, 0, 0, C.TRUE, 0, 0, 0, voidptr(&start_info), voidptr(&proc_info)))
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if create_process_result == 0 {
error_msg := get_error_msg(int(C.GetLastError()))
return error('exec failed (CreateProcess): $error_msg')
}
C.CloseHandle(child_stdin)
C.CloseHandle(child_stdout_write)
buf := [1000]byte
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mut bytes_read := u32(0)
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mut read_data := ''
for {
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readfile_result := C.ReadFile(child_stdout_read, buf, 1000, voidptr(&bytes_read), 0)
read_data += tos(buf, int(bytes_read))
if (readfile_result == false || int(bytes_read) == 0) {
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break
}
}
read_data = read_data.trim_space()
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exit_code := u32(0)
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C.WaitForSingleObject(proc_info.hProcess, C.INFINITE)
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C.GetExitCodeProcess(proc_info.hProcess, voidptr(&exit_code))
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C.CloseHandle(proc_info.hProcess)
C.CloseHandle(proc_info.hThread)
return Result {
output: read_data
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exit_code: int(exit_code)
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}
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}