1#![unstable(feature = "process_internals", issue = "none")]
2
3#[cfg(test)]
4mod tests;
5
6use core::ffi::c_void;
7
8use super::env::{CommandEnv, CommandEnvs};
9use crate::collections::BTreeMap;
10use crate::env::consts::{EXE_EXTENSION, EXE_SUFFIX};
11use crate::ffi::{OsStr, OsString};
12use crate::io::{self, Error};
13use crate::num::NonZero;
14use crate::os::windows::ffi::{OsStrExt, OsStringExt};
15use crate::os::windows::io::{AsHandle, AsRawHandle, BorrowedHandle, FromRawHandle, IntoRawHandle};
16use crate::os::windows::process::ProcThreadAttributeList;
17use crate::path::{Path, PathBuf};
18use crate::sync::Mutex;
19use crate::sys::args::{self, Arg};
20use crate::sys::c::{self, EXIT_FAILURE, EXIT_SUCCESS};
21use crate::sys::fs::{File, OpenOptions};
22use crate::sys::handle::Handle;
23use crate::sys::pal::api::{self, WinError, utf16};
24use crate::sys::pal::{ensure_no_nuls, fill_utf16_buf};
25use crate::sys::pipe::{self, AnonPipe};
26use crate::sys::{cvt, path, stdio};
27use crate::sys_common::IntoInner;
28use crate::{cmp, env, fmt, ptr};
29
30#[derive(Clone, Debug, Eq)]
35#[doc(hidden)]
36pub struct EnvKey {
37 os_string: OsString,
38 utf16: Vec<u16>,
43}
44
45impl EnvKey {
46 fn new<T: Into<OsString>>(key: T) -> Self {
47 EnvKey::from(key.into())
48 }
49}
50
51impl Ord for EnvKey {
72 fn cmp(&self, other: &Self) -> cmp::Ordering {
73 unsafe {
74 let result = c::CompareStringOrdinal(
75 self.utf16.as_ptr(),
76 self.utf16.len() as _,
77 other.utf16.as_ptr(),
78 other.utf16.len() as _,
79 c::TRUE,
80 );
81 match result {
82 c::CSTR_LESS_THAN => cmp::Ordering::Less,
83 c::CSTR_EQUAL => cmp::Ordering::Equal,
84 c::CSTR_GREATER_THAN => cmp::Ordering::Greater,
85 _ => panic!("comparing environment keys failed: {}", Error::last_os_error()),
87 }
88 }
89 }
90}
91impl PartialOrd for EnvKey {
92 fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> {
93 Some(self.cmp(other))
94 }
95}
96impl PartialEq for EnvKey {
97 fn eq(&self, other: &Self) -> bool {
98 if self.utf16.len() != other.utf16.len() {
99 false
100 } else {
101 self.cmp(other) == cmp::Ordering::Equal
102 }
103 }
104}
105impl PartialOrd<str> for EnvKey {
106 fn partial_cmp(&self, other: &str) -> Option<cmp::Ordering> {
107 Some(self.cmp(&EnvKey::new(other)))
108 }
109}
110impl PartialEq<str> for EnvKey {
111 fn eq(&self, other: &str) -> bool {
112 if self.os_string.len() != other.len() {
113 false
114 } else {
115 self.cmp(&EnvKey::new(other)) == cmp::Ordering::Equal
116 }
117 }
118}
119
120impl From<OsString> for EnvKey {
123 fn from(k: OsString) -> Self {
124 EnvKey { utf16: k.encode_wide().collect(), os_string: k }
125 }
126}
127
128impl From<EnvKey> for OsString {
129 fn from(k: EnvKey) -> Self {
130 k.os_string
131 }
132}
133
134impl From<&OsStr> for EnvKey {
135 fn from(k: &OsStr) -> Self {
136 Self::from(k.to_os_string())
137 }
138}
139
140impl AsRef<OsStr> for EnvKey {
141 fn as_ref(&self) -> &OsStr {
142 &self.os_string
143 }
144}
145
146pub struct Command {
147 program: OsString,
148 args: Vec<Arg>,
149 env: CommandEnv,
150 cwd: Option<OsString>,
151 flags: u32,
152 show_window: Option<u16>,
153 detach: bool, stdin: Option<Stdio>,
155 stdout: Option<Stdio>,
156 stderr: Option<Stdio>,
157 force_quotes_enabled: bool,
158}
159
160pub enum Stdio {
161 Inherit,
162 InheritSpecific { from_stdio_id: u32 },
163 Null,
164 MakePipe,
165 Pipe(AnonPipe),
166 Handle(Handle),
167}
168
169pub struct StdioPipes {
170 pub stdin: Option<AnonPipe>,
171 pub stdout: Option<AnonPipe>,
172 pub stderr: Option<AnonPipe>,
173}
174
175impl Command {
176 pub fn new(program: &OsStr) -> Command {
177 Command {
178 program: program.to_os_string(),
179 args: Vec::new(),
180 env: Default::default(),
181 cwd: None,
182 flags: 0,
183 show_window: None,
184 detach: false,
185 stdin: None,
186 stdout: None,
187 stderr: None,
188 force_quotes_enabled: false,
189 }
190 }
191
192 pub fn arg(&mut self, arg: &OsStr) {
193 self.args.push(Arg::Regular(arg.to_os_string()))
194 }
195 pub fn env_mut(&mut self) -> &mut CommandEnv {
196 &mut self.env
197 }
198 pub fn cwd(&mut self, dir: &OsStr) {
199 self.cwd = Some(dir.to_os_string())
200 }
201 pub fn stdin(&mut self, stdin: Stdio) {
202 self.stdin = Some(stdin);
203 }
204 pub fn stdout(&mut self, stdout: Stdio) {
205 self.stdout = Some(stdout);
206 }
207 pub fn stderr(&mut self, stderr: Stdio) {
208 self.stderr = Some(stderr);
209 }
210 pub fn creation_flags(&mut self, flags: u32) {
211 self.flags = flags;
212 }
213 pub fn show_window(&mut self, cmd_show: Option<u16>) {
214 self.show_window = cmd_show;
215 }
216
217 pub fn force_quotes(&mut self, enabled: bool) {
218 self.force_quotes_enabled = enabled;
219 }
220
221 pub fn raw_arg(&mut self, command_str_to_append: &OsStr) {
222 self.args.push(Arg::Raw(command_str_to_append.to_os_string()))
223 }
224
225 pub fn get_program(&self) -> &OsStr {
226 &self.program
227 }
228
229 pub fn get_args(&self) -> CommandArgs<'_> {
230 let iter = self.args.iter();
231 CommandArgs { iter }
232 }
233
234 pub fn get_envs(&self) -> CommandEnvs<'_> {
235 self.env.iter()
236 }
237
238 pub fn get_current_dir(&self) -> Option<&Path> {
239 self.cwd.as_ref().map(Path::new)
240 }
241
242 pub fn spawn(
243 &mut self,
244 default: Stdio,
245 needs_stdin: bool,
246 ) -> io::Result<(Process, StdioPipes)> {
247 self.spawn_with_attributes(default, needs_stdin, None)
248 }
249
250 pub fn spawn_with_attributes(
251 &mut self,
252 default: Stdio,
253 needs_stdin: bool,
254 proc_thread_attribute_list: Option<&ProcThreadAttributeList<'_>>,
255 ) -> io::Result<(Process, StdioPipes)> {
256 let env_saw_path = self.env.have_changed_path();
257 let maybe_env = self.env.capture_if_changed();
258
259 let child_paths = if env_saw_path && let Some(env) = maybe_env.as_ref() {
260 env.get(&EnvKey::new("PATH")).map(|s| s.as_os_str())
261 } else {
262 None
263 };
264 let program = resolve_exe(&self.program, || env::var_os("PATH"), child_paths)?;
265 let has_bat_extension = |program: &[u16]| {
266 matches!(
267 program.len().checked_sub(4).and_then(|i| program.get(i..)),
269 Some([46, 98 | 66, 97 | 65, 116 | 84] | [46, 99 | 67, 109 | 77, 100 | 68])
270 )
271 };
272 let is_batch_file = if path::is_verbatim(&program) {
273 has_bat_extension(&program[..program.len() - 1])
274 } else {
275 fill_utf16_buf(
276 |buffer, size| unsafe {
277 c::GetFullPathNameW(program.as_ptr(), size, buffer, ptr::null_mut())
279 },
280 |program| has_bat_extension(program),
281 )?
282 };
283 let (program, mut cmd_str) = if is_batch_file {
284 (
285 command_prompt()?,
286 args::make_bat_command_line(&program, &self.args, self.force_quotes_enabled)?,
287 )
288 } else {
289 let cmd_str = make_command_line(&self.program, &self.args, self.force_quotes_enabled)?;
290 (program, cmd_str)
291 };
292 cmd_str.push(0); let mut flags = self.flags | c::CREATE_UNICODE_ENVIRONMENT;
296 if self.detach {
297 flags |= c::DETACHED_PROCESS | c::CREATE_NEW_PROCESS_GROUP;
298 }
299
300 let (envp, _data) = make_envp(maybe_env)?;
301 let (dirp, _data) = make_dirp(self.cwd.as_ref())?;
302 let mut pi = zeroed_process_information();
303
304 static CREATE_PROCESS_LOCK: Mutex<()> = Mutex::new(());
314
315 let _guard = CREATE_PROCESS_LOCK.lock();
316
317 let mut pipes = StdioPipes { stdin: None, stdout: None, stderr: None };
318 let null = Stdio::Null;
319 let default_stdin = if needs_stdin { &default } else { &null };
320 let stdin = self.stdin.as_ref().unwrap_or(default_stdin);
321 let stdout = self.stdout.as_ref().unwrap_or(&default);
322 let stderr = self.stderr.as_ref().unwrap_or(&default);
323 let stdin = stdin.to_handle(c::STD_INPUT_HANDLE, &mut pipes.stdin)?;
324 let stdout = stdout.to_handle(c::STD_OUTPUT_HANDLE, &mut pipes.stdout)?;
325 let stderr = stderr.to_handle(c::STD_ERROR_HANDLE, &mut pipes.stderr)?;
326
327 let mut si = zeroed_startupinfo();
328
329 let is_set = |stdio: &Handle| !stdio.as_raw_handle().is_null();
334 if is_set(&stderr) || is_set(&stdout) || is_set(&stdin) {
335 si.dwFlags |= c::STARTF_USESTDHANDLES;
336 si.hStdInput = stdin.as_raw_handle();
337 si.hStdOutput = stdout.as_raw_handle();
338 si.hStdError = stderr.as_raw_handle();
339 }
340
341 if let Some(cmd_show) = self.show_window {
342 si.dwFlags |= c::STARTF_USESHOWWINDOW;
343 si.wShowWindow = cmd_show;
344 }
345
346 let si_ptr: *mut c::STARTUPINFOW;
347
348 let mut si_ex;
349
350 if let Some(proc_thread_attribute_list) = proc_thread_attribute_list {
351 si.cb = size_of::<c::STARTUPINFOEXW>() as u32;
352 flags |= c::EXTENDED_STARTUPINFO_PRESENT;
353
354 si_ex = c::STARTUPINFOEXW {
355 StartupInfo: si,
356 lpAttributeList: proc_thread_attribute_list.as_ptr().cast::<c_void>().cast_mut(),
360 };
361 si_ptr = (&raw mut si_ex) as _;
362 } else {
363 si.cb = size_of::<c::STARTUPINFOW>() as u32;
364 si_ptr = (&raw mut si) as _;
365 }
366
367 unsafe {
368 cvt(c::CreateProcessW(
369 program.as_ptr(),
370 cmd_str.as_mut_ptr(),
371 ptr::null_mut(),
372 ptr::null_mut(),
373 c::TRUE,
374 flags,
375 envp,
376 dirp,
377 si_ptr,
378 &mut pi,
379 ))
380 }?;
381
382 unsafe {
383 Ok((
384 Process {
385 handle: Handle::from_raw_handle(pi.hProcess),
386 main_thread_handle: Handle::from_raw_handle(pi.hThread),
387 },
388 pipes,
389 ))
390 }
391 }
392}
393
394impl fmt::Debug for Command {
395 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
396 self.program.fmt(f)?;
397 for arg in &self.args {
398 f.write_str(" ")?;
399 match arg {
400 Arg::Regular(s) => s.fmt(f),
401 Arg::Raw(s) => f.write_str(&s.to_string_lossy()),
402 }?;
403 }
404 Ok(())
405 }
406}
407
408fn resolve_exe<'a>(
421 exe_path: &'a OsStr,
422 parent_paths: impl FnOnce() -> Option<OsString>,
423 child_paths: Option<&OsStr>,
424) -> io::Result<Vec<u16>> {
425 if exe_path.is_empty() || path::has_trailing_slash(exe_path) {
427 return Err(io::const_error!(io::ErrorKind::InvalidInput, "program path has no file name"));
428 }
429 let has_exe_suffix = if exe_path.len() >= EXE_SUFFIX.len() {
432 exe_path.as_encoded_bytes()[exe_path.len() - EXE_SUFFIX.len()..]
433 .eq_ignore_ascii_case(EXE_SUFFIX.as_bytes())
434 } else {
435 false
436 };
437
438 if !path::is_file_name(exe_path) {
440 if has_exe_suffix {
441 return args::to_user_path(Path::new(exe_path));
444 }
445 let mut path = PathBuf::from(exe_path);
446
447 path = path::append_suffix(path, EXE_SUFFIX.as_ref());
449 if let Some(path) = program_exists(&path) {
450 return Ok(path);
451 } else {
452 path.set_extension("");
455 return args::to_user_path(&path);
456 }
457 } else {
458 ensure_no_nuls(exe_path)?;
459 let has_extension = exe_path.as_encoded_bytes().contains(&b'.');
463
464 let result = search_paths(parent_paths, child_paths, |mut path| {
466 path.push(exe_path);
467 if !has_extension {
468 path.set_extension(EXE_EXTENSION);
469 }
470 program_exists(&path)
471 });
472 if let Some(path) = result {
473 return Ok(path);
474 }
475 }
476 Err(io::const_error!(io::ErrorKind::NotFound, "program not found"))
478}
479
480fn search_paths<Paths, Exists>(
483 parent_paths: Paths,
484 child_paths: Option<&OsStr>,
485 mut exists: Exists,
486) -> Option<Vec<u16>>
487where
488 Paths: FnOnce() -> Option<OsString>,
489 Exists: FnMut(PathBuf) -> Option<Vec<u16>>,
490{
491 if let Some(paths) = child_paths {
494 for path in env::split_paths(paths).filter(|p| !p.as_os_str().is_empty()) {
495 if let Some(path) = exists(path) {
496 return Some(path);
497 }
498 }
499 }
500
501 if let Ok(mut app_path) = env::current_exe() {
503 app_path.pop();
504 if let Some(path) = exists(app_path) {
505 return Some(path);
506 }
507 }
508
509 unsafe {
512 if let Ok(Some(path)) = fill_utf16_buf(
513 |buf, size| c::GetSystemDirectoryW(buf, size),
514 |buf| exists(PathBuf::from(OsString::from_wide(buf))),
515 ) {
516 return Some(path);
517 }
518 #[cfg(not(target_vendor = "uwp"))]
519 {
520 if let Ok(Some(path)) = fill_utf16_buf(
521 |buf, size| c::GetWindowsDirectoryW(buf, size),
522 |buf| exists(PathBuf::from(OsString::from_wide(buf))),
523 ) {
524 return Some(path);
525 }
526 }
527 }
528
529 if let Some(parent_paths) = parent_paths() {
531 for path in env::split_paths(&parent_paths).filter(|p| !p.as_os_str().is_empty()) {
532 if let Some(path) = exists(path) {
533 return Some(path);
534 }
535 }
536 }
537 None
538}
539
540fn program_exists(path: &Path) -> Option<Vec<u16>> {
542 unsafe {
543 let path = args::to_user_path(path).ok()?;
544 if c::GetFileAttributesW(path.as_ptr()) == c::INVALID_FILE_ATTRIBUTES {
549 None
550 } else {
551 Some(path)
552 }
553 }
554}
555
556impl Stdio {
557 fn to_handle(&self, stdio_id: u32, pipe: &mut Option<AnonPipe>) -> io::Result<Handle> {
558 let use_stdio_id = |stdio_id| match stdio::get_handle(stdio_id) {
559 Ok(io) => unsafe {
560 let io = Handle::from_raw_handle(io);
561 let ret = io.duplicate(0, true, c::DUPLICATE_SAME_ACCESS);
562 let _ = io.into_raw_handle(); ret
564 },
565 Err(..) => unsafe { Ok(Handle::from_raw_handle(ptr::null_mut())) },
567 };
568 match *self {
569 Stdio::Inherit => use_stdio_id(stdio_id),
570 Stdio::InheritSpecific { from_stdio_id } => use_stdio_id(from_stdio_id),
571
572 Stdio::MakePipe => {
573 let ours_readable = stdio_id != c::STD_INPUT_HANDLE;
574 let pipes = pipe::anon_pipe(ours_readable, true)?;
575 *pipe = Some(pipes.ours);
576 Ok(pipes.theirs.into_handle())
577 }
578
579 Stdio::Pipe(ref source) => {
580 let ours_readable = stdio_id != c::STD_INPUT_HANDLE;
581 pipe::spawn_pipe_relay(source, ours_readable, true).map(AnonPipe::into_handle)
582 }
583
584 Stdio::Handle(ref handle) => handle.duplicate(0, true, c::DUPLICATE_SAME_ACCESS),
585
586 Stdio::Null => {
590 let size = size_of::<c::SECURITY_ATTRIBUTES>();
591 let mut sa = c::SECURITY_ATTRIBUTES {
592 nLength: size as u32,
593 lpSecurityDescriptor: ptr::null_mut(),
594 bInheritHandle: 1,
595 };
596 let mut opts = OpenOptions::new();
597 opts.read(stdio_id == c::STD_INPUT_HANDLE);
598 opts.write(stdio_id != c::STD_INPUT_HANDLE);
599 opts.security_attributes(&mut sa);
600 File::open(Path::new(r"\\.\NUL"), &opts).map(|file| file.into_inner())
601 }
602 }
603 }
604}
605
606impl From<AnonPipe> for Stdio {
607 fn from(pipe: AnonPipe) -> Stdio {
608 Stdio::Pipe(pipe)
609 }
610}
611
612impl From<Handle> for Stdio {
613 fn from(pipe: Handle) -> Stdio {
614 Stdio::Handle(pipe)
615 }
616}
617
618impl From<File> for Stdio {
619 fn from(file: File) -> Stdio {
620 Stdio::Handle(file.into_inner())
621 }
622}
623
624impl From<io::Stdout> for Stdio {
625 fn from(_: io::Stdout) -> Stdio {
626 Stdio::InheritSpecific { from_stdio_id: c::STD_OUTPUT_HANDLE }
627 }
628}
629
630impl From<io::Stderr> for Stdio {
631 fn from(_: io::Stderr) -> Stdio {
632 Stdio::InheritSpecific { from_stdio_id: c::STD_ERROR_HANDLE }
633 }
634}
635
636pub struct Process {
646 handle: Handle,
647 main_thread_handle: Handle,
648}
649
650impl Process {
651 pub fn kill(&mut self) -> io::Result<()> {
652 let result = unsafe { c::TerminateProcess(self.handle.as_raw_handle(), 1) };
653 if result == c::FALSE {
654 let error = api::get_last_error();
655 if error != WinError::ACCESS_DENIED || self.try_wait().is_err() {
659 return Err(crate::io::Error::from_raw_os_error(error.code as i32));
660 }
661 }
662 Ok(())
663 }
664
665 pub fn id(&self) -> u32 {
666 unsafe { c::GetProcessId(self.handle.as_raw_handle()) }
667 }
668
669 pub fn main_thread_handle(&self) -> BorrowedHandle<'_> {
670 self.main_thread_handle.as_handle()
671 }
672
673 pub fn wait(&mut self) -> io::Result<ExitStatus> {
674 unsafe {
675 let res = c::WaitForSingleObject(self.handle.as_raw_handle(), c::INFINITE);
676 if res != c::WAIT_OBJECT_0 {
677 return Err(Error::last_os_error());
678 }
679 let mut status = 0;
680 cvt(c::GetExitCodeProcess(self.handle.as_raw_handle(), &mut status))?;
681 Ok(ExitStatus(status))
682 }
683 }
684
685 pub fn try_wait(&mut self) -> io::Result<Option<ExitStatus>> {
686 unsafe {
687 match c::WaitForSingleObject(self.handle.as_raw_handle(), 0) {
688 c::WAIT_OBJECT_0 => {}
689 c::WAIT_TIMEOUT => {
690 return Ok(None);
691 }
692 _ => return Err(io::Error::last_os_error()),
693 }
694 let mut status = 0;
695 cvt(c::GetExitCodeProcess(self.handle.as_raw_handle(), &mut status))?;
696 Ok(Some(ExitStatus(status)))
697 }
698 }
699
700 pub fn handle(&self) -> &Handle {
701 &self.handle
702 }
703
704 pub fn into_handle(self) -> Handle {
705 self.handle
706 }
707}
708
709#[derive(PartialEq, Eq, Clone, Copy, Debug, Default)]
710pub struct ExitStatus(u32);
711
712impl ExitStatus {
713 pub fn exit_ok(&self) -> Result<(), ExitStatusError> {
714 match NonZero::<u32>::try_from(self.0) {
715 Ok(failure) => Err(ExitStatusError(failure)),
716 Err(_) => Ok(()),
717 }
718 }
719 pub fn code(&self) -> Option<i32> {
720 Some(self.0 as i32)
721 }
722}
723
724impl From<u32> for ExitStatus {
726 fn from(u: u32) -> ExitStatus {
727 ExitStatus(u)
728 }
729}
730
731impl fmt::Display for ExitStatus {
732 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
733 if self.0 & 0x80000000 != 0 {
739 write!(f, "exit code: {:#x}", self.0)
740 } else {
741 write!(f, "exit code: {}", self.0)
742 }
743 }
744}
745
746#[derive(PartialEq, Eq, Clone, Copy, Debug)]
747pub struct ExitStatusError(NonZero<u32>);
748
749impl Into<ExitStatus> for ExitStatusError {
750 fn into(self) -> ExitStatus {
751 ExitStatus(self.0.into())
752 }
753}
754
755impl ExitStatusError {
756 pub fn code(self) -> Option<NonZero<i32>> {
757 Some((u32::from(self.0) as i32).try_into().unwrap())
758 }
759}
760
761#[derive(PartialEq, Eq, Clone, Copy, Debug)]
762pub struct ExitCode(u32);
763
764impl ExitCode {
765 pub const SUCCESS: ExitCode = ExitCode(EXIT_SUCCESS as _);
766 pub const FAILURE: ExitCode = ExitCode(EXIT_FAILURE as _);
767
768 #[inline]
769 pub fn as_i32(&self) -> i32 {
770 self.0 as i32
771 }
772}
773
774impl From<u8> for ExitCode {
775 fn from(code: u8) -> Self {
776 ExitCode(u32::from(code))
777 }
778}
779
780impl From<u32> for ExitCode {
781 fn from(code: u32) -> Self {
782 ExitCode(u32::from(code))
783 }
784}
785
786fn zeroed_startupinfo() -> c::STARTUPINFOW {
787 c::STARTUPINFOW {
788 cb: 0,
789 lpReserved: ptr::null_mut(),
790 lpDesktop: ptr::null_mut(),
791 lpTitle: ptr::null_mut(),
792 dwX: 0,
793 dwY: 0,
794 dwXSize: 0,
795 dwYSize: 0,
796 dwXCountChars: 0,
797 dwYCountChars: 0,
798 dwFillAttribute: 0,
799 dwFlags: 0,
800 wShowWindow: 0,
801 cbReserved2: 0,
802 lpReserved2: ptr::null_mut(),
803 hStdInput: ptr::null_mut(),
804 hStdOutput: ptr::null_mut(),
805 hStdError: ptr::null_mut(),
806 }
807}
808
809fn zeroed_process_information() -> c::PROCESS_INFORMATION {
810 c::PROCESS_INFORMATION {
811 hProcess: ptr::null_mut(),
812 hThread: ptr::null_mut(),
813 dwProcessId: 0,
814 dwThreadId: 0,
815 }
816}
817
818fn make_command_line(argv0: &OsStr, args: &[Arg], force_quotes: bool) -> io::Result<Vec<u16>> {
821 let mut cmd: Vec<u16> = Vec::new();
824
825 cmd.push(b'"' as u16);
830 cmd.extend(argv0.encode_wide());
831 cmd.push(b'"' as u16);
832
833 for arg in args {
834 cmd.push(' ' as u16);
835 args::append_arg(&mut cmd, arg, force_quotes)?;
836 }
837 Ok(cmd)
838}
839
840fn command_prompt() -> io::Result<Vec<u16>> {
842 let mut system: Vec<u16> =
843 fill_utf16_buf(|buf, size| unsafe { c::GetSystemDirectoryW(buf, size) }, |buf| buf.into())?;
844 system.extend("\\cmd.exe".encode_utf16().chain([0]));
845 Ok(system)
846}
847
848fn make_envp(maybe_env: Option<BTreeMap<EnvKey, OsString>>) -> io::Result<(*mut c_void, Vec<u16>)> {
849 if let Some(env) = maybe_env {
853 let mut blk = Vec::new();
854
855 if env.is_empty() {
858 blk.push(0);
859 }
860
861 for (k, v) in env {
862 ensure_no_nuls(k.os_string)?;
863 blk.extend(k.utf16);
864 blk.push('=' as u16);
865 blk.extend(ensure_no_nuls(v)?.encode_wide());
866 blk.push(0);
867 }
868 blk.push(0);
869 Ok((blk.as_mut_ptr() as *mut c_void, blk))
870 } else {
871 Ok((ptr::null_mut(), Vec::new()))
872 }
873}
874
875fn make_dirp(d: Option<&OsString>) -> io::Result<(*const u16, Vec<u16>)> {
876 match d {
877 Some(dir) => {
878 let mut dir_str: Vec<u16> = ensure_no_nuls(dir)?.encode_wide().chain([0]).collect();
879 let ptr = if dir_str.starts_with(utf16!(r"\\?\UNC")) {
883 let start = r"\\?\UN".len();
885 dir_str[start] = b'\\' as u16;
886 if path::is_absolute_exact(&dir_str[start..]) {
887 dir_str[start..].as_ptr()
888 } else {
889 dir_str[start] = b'C' as u16;
891 dir_str.as_ptr()
892 }
893 } else if dir_str.starts_with(utf16!(r"\\?\")) {
894 let start = r"\\?\".len();
896 if path::is_absolute_exact(&dir_str[start..]) {
897 dir_str[start..].as_ptr()
898 } else {
899 dir_str.as_ptr()
900 }
901 } else {
902 dir_str.as_ptr()
903 };
904 Ok((ptr, dir_str))
905 }
906 None => Ok((ptr::null(), Vec::new())),
907 }
908}
909
910pub struct CommandArgs<'a> {
911 iter: crate::slice::Iter<'a, Arg>,
912}
913
914impl<'a> Iterator for CommandArgs<'a> {
915 type Item = &'a OsStr;
916 fn next(&mut self) -> Option<&'a OsStr> {
917 self.iter.next().map(|arg| match arg {
918 Arg::Regular(s) | Arg::Raw(s) => s.as_ref(),
919 })
920 }
921 fn size_hint(&self) -> (usize, Option<usize>) {
922 self.iter.size_hint()
923 }
924}
925
926impl<'a> ExactSizeIterator for CommandArgs<'a> {
927 fn len(&self) -> usize {
928 self.iter.len()
929 }
930 fn is_empty(&self) -> bool {
931 self.iter.is_empty()
932 }
933}
934
935impl<'a> fmt::Debug for CommandArgs<'a> {
936 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
937 f.debug_list().entries(self.iter.clone()).finish()
938 }
939}