library/std/src/sys/vxworks/os.rs - third_party/rust - Git at Google

 use crate::error::Error as StdError;
 use crate::ffi::{CStr, CString, OsStr, OsString};
 use crate::fmt;
 use crate::io;
 use crate::iter;
 use crate::marker::PhantomData;
 use crate::mem;
 use crate::memchr;
 use crate::path::{self, Path, PathBuf};
 use crate::slice;
 use crate::str;
 use crate::sys::cvt;
 use crate::sys_common::mutex::{Mutex, MutexGuard};
 use libc::{self, c_char /*,c_void */, c_int};
 /*use sys::fd; this one is probably important */
 use crate::vec;

 const TMPBUF_SZ: usize = 128;

 // This is a terrible fix
 use crate::sys::os_str::Buf;
 use crate::sys_common::{AsInner, FromInner, IntoInner};

 pub trait OsStringExt {
     fn from_vec(vec: Vec<u8>) -> Self;
     fn into_vec(self) -> Vec<u8>;
 }

 impl OsStringExt for OsString {
     fn from_vec(vec: Vec<u8>) -> OsString {
         FromInner::from_inner(Buf { inner: vec })
     }
     fn into_vec(self) -> Vec<u8> {
         self.into_inner().inner
     }
 }

 pub trait OsStrExt {
     fn from_bytes(slice: &[u8]) -> &Self;
     fn as_bytes(&self) -> &[u8];
 }

 impl OsStrExt for OsStr {
     fn from_bytes(slice: &[u8]) -> &OsStr {
         unsafe { mem::transmute(slice) }
     }
     fn as_bytes(&self) -> &[u8] {
         &self.as_inner().inner
     }
 }

 pub fn errno() -> i32 {
     unsafe { libc::errnoGet() }
 }

 pub fn set_errno(e: i32) {
     unsafe {
         libc::errnoSet(e as c_int);
     }
 }

 /// Gets a detailed string description for the given error number.
 pub fn error_string(errno: i32) -> String {
     let mut buf = [0 as c_char; TMPBUF_SZ];
     extern "C" {
         fn strerror_r(errnum: c_int, buf: *mut c_char, buflen: libc::size_t) -> c_int;
     }

     let p = buf.as_mut_ptr();
     unsafe {
         if strerror_r(errno as c_int, p, buf.len()) < 0 {
             panic!("strerror_r failure");
         }
         let p = p as *const _;
         str::from_utf8(CStr::from_ptr(p).to_bytes()).unwrap().to_owned()
     }
 }

 pub fn getcwd() -> io::Result<PathBuf> {
     let mut buf = Vec::with_capacity(512);
     loop {
         unsafe {
             let ptr = buf.as_mut_ptr() as *mut libc::c_char;
             if !libc::getcwd(ptr, buf.capacity() as libc::size_t).is_null() {
                 let len = CStr::from_ptr(buf.as_ptr() as *const libc::c_char).to_bytes().len();
                 buf.set_len(len);
                 buf.shrink_to_fit();
                 return Ok(PathBuf::from(OsString::from_vec(buf)));
             } else {
                 let error = io::Error::last_os_error();
                 if error.raw_os_error() != Some(libc::ERANGE) {
                     return Err(error);
                 }
             }
             // Trigger the internal buffer resizing logic of `Vec` by requiring
             // more space than the current capacity.
             let cap = buf.capacity();
             buf.set_len(cap);
             buf.reserve(1);
         }
     }
 }

 pub fn chdir(p: &path::Path) -> io::Result<()> {
     let p: &OsStr = p.as_ref();
     let p = CString::new(p.as_bytes())?;
     unsafe {
         match libc::chdir(p.as_ptr()) == (0 as c_int) {
             true => Ok(()),
             false => Err(io::Error::last_os_error()),
         }
     }
 }

 pub struct SplitPaths<'a> {
     iter: iter::Map<slice::Split<'a, u8, fn(&u8) -> bool>, fn(&'a [u8]) -> PathBuf>,
 }

 pub fn split_paths(unparsed: &OsStr) -> SplitPaths<'_> {
     fn bytes_to_path(b: &[u8]) -> PathBuf {
         PathBuf::from(<OsStr as OsStrExt>::from_bytes(b))
     }
     fn is_colon(b: &u8) -> bool {
         *b == b':'
     }
     let unparsed = unparsed.as_bytes();
     SplitPaths {
         iter: unparsed
             .split(is_colon as fn(&u8) -> bool)
             .map(bytes_to_path as fn(&[u8]) -> PathBuf),
     }
 }

 impl<'a> Iterator for SplitPaths<'a> {
     type Item = PathBuf;
     fn next(&mut self) -> Option<PathBuf> {
         self.iter.next()
     }
     fn size_hint(&self) -> (usize, Option<usize>) {
         self.iter.size_hint()
     }
 }

 #[derive(Debug)]
 pub struct JoinPathsError;

 pub fn join_paths<I, T>(paths: I) -> Result<OsString, JoinPathsError>
 where
     I: Iterator<Item = T>,
     T: AsRef<OsStr>,
 {
     let mut joined = Vec::new();
     let sep = b':';

     for (i, path) in paths.enumerate() {
         let path = path.as_ref().as_bytes();
         if i > 0 {
             joined.push(sep)
         }
         if path.contains(&sep) {
             return Err(JoinPathsError);
         }
         joined.extend_from_slice(path);
     }
     Ok(OsStringExt::from_vec(joined))
 }

 impl fmt::Display for JoinPathsError {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         "path segment contains separator `:`".fmt(f)
     }
 }

 impl StdError for JoinPathsError {
     #[allow(deprecated)]
     fn description(&self) -> &str {
         "failed to join paths"
     }
 }

 pub fn current_exe() -> io::Result<PathBuf> {
     #[cfg(test)]
     use realstd::env;

     #[cfg(not(test))]
     use crate::env;

     let exe_path = env::args().next().unwrap();
     let path = Path::new(&exe_path);
     path.canonicalize()
 }

 pub struct Env {
     iter: vec::IntoIter<(OsString, OsString)>,
     _dont_send_or_sync_me: PhantomData<*mut ()>,
 }

 impl Iterator for Env {
     type Item = (OsString, OsString);
     fn next(&mut self) -> Option<(OsString, OsString)> {
         self.iter.next()
     }
     fn size_hint(&self) -> (usize, Option<usize>) {
         self.iter.size_hint()
     }
 }

 pub unsafe fn environ() -> *mut *const *const c_char {
     extern "C" {
         static mut environ: *const *const c_char;
     }
     &mut environ
 }

 pub unsafe fn env_lock() -> MutexGuard<'static> {
     // We never call `ENV_LOCK.init()`, so it is UB to attempt to
     // acquire this mutex reentrantly!
     static ENV_LOCK: Mutex = Mutex::new();
     ENV_LOCK.lock()
 }

 /// Returns a vector of (variable, value) byte-vector pairs for all the
 /// environment variables of the current process.
 pub fn env() -> Env {
     unsafe {
         let _guard = env_lock();
         let mut environ = *environ();
         if environ.is_null() {
             panic!("os::env() failure getting env string from OS: {}", io::Error::last_os_error());
         }
         let mut result = Vec::new();
         while !(*environ).is_null() {
             if let Some(key_value) = parse(CStr::from_ptr(*environ).to_bytes()) {
                 result.push(key_value);
             }
             environ = environ.add(1);
         }
         return Env { iter: result.into_iter(), _dont_send_or_sync_me: PhantomData };
     }

     fn parse(input: &[u8]) -> Option<(OsString, OsString)> {
         // Strategy (copied from glibc): Variable name and value are separated
         // by an ASCII equals sign '='. Since a variable name must not be
         // empty, allow variable names starting with an equals sign. Skip all
         // malformed lines.
         if input.is_empty() {
             return None;
         }
         let pos = memchr::memchr(b'=', &input[1..]).map(|p| p + 1);
         pos.map(|p| {
             (
                 OsStringExt::from_vec(input[..p].to_vec()),
                 OsStringExt::from_vec(input[p + 1..].to_vec()),
             )
         })
     }
 }

 pub fn getenv(k: &OsStr) -> io::Result<Option<OsString>> {
     // environment variables with a nul byte can't be set, so their value is
     // always None as well
     let k = CString::new(k.as_bytes())?;
     unsafe {
         let _guard = env_lock();
         let s = libc::getenv(k.as_ptr()) as *const libc::c_char;
         let ret = if s.is_null() {
             None
         } else {
             Some(OsStringExt::from_vec(CStr::from_ptr(s).to_bytes().to_vec()))
         };
         Ok(ret)
     }
 }

 pub fn setenv(k: &OsStr, v: &OsStr) -> io::Result<()> {
     let k = CString::new(k.as_bytes())?;
     let v = CString::new(v.as_bytes())?;

     unsafe {
         let _guard = env_lock();
         cvt(libc::setenv(k.as_ptr(), v.as_ptr(), 1)).map(drop)
     }
 }

 pub fn unsetenv(n: &OsStr) -> io::Result<()> {
     let nbuf = CString::new(n.as_bytes())?;

     unsafe {
         let _guard = env_lock();
         cvt(libc::unsetenv(nbuf.as_ptr())).map(drop)
     }
 }

 pub fn page_size() -> usize {
     unsafe { libc::sysconf(libc::_SC_PAGESIZE) as usize }
 }

 pub fn temp_dir() -> PathBuf {
     crate::env::var_os("TMPDIR").map(PathBuf::from).unwrap_or_else(|| PathBuf::from("/tmp"))
 }

 pub fn home_dir() -> Option<PathBuf> {
     crate::env::var_os("HOME").or_else(|| None).map(PathBuf::from)
 }

 pub fn exit(code: i32) -> ! {
     unsafe { libc::exit(code as c_int) }
 }

 pub fn getpid() -> u32 {
     unsafe { libc::getpid() as u32 }
 }

 pub fn getppid() -> u32 {
     unsafe { libc::getppid() as u32 }
 }
	use crate::error::Error as StdError;
	use crate::ffi::{CStr, CString, OsStr, OsString};
	use crate::fmt;
	use crate::io;
	use crate::iter;
	use crate::marker::PhantomData;
	use crate::mem;
	use crate::memchr;
	use crate::path::{self, Path, PathBuf};
	use crate::slice;
	use crate::str;
	use crate::sys::cvt;
	use crate::sys_common::mutex::{Mutex, MutexGuard};
	use libc::{self, c_char /,c_void /, c_int};
	/use sys::fd; this one is probably important /
	use crate::vec;

	const TMPBUF_SZ: usize = 128;

	// This is a terrible fix
	use crate::sys::os_str::Buf;
	use crate::sys_common::{AsInner, FromInner, IntoInner};

	pub trait OsStringExt {
	fn from_vec(vec: Vec<u8>) -> Self;
	fn into_vec(self) -> Vec<u8>;
	}

	impl OsStringExt for OsString {
	fn from_vec(vec: Vec<u8>) -> OsString {
	FromInner::from_inner(Buf { inner: vec })
	}
	fn into_vec(self) -> Vec<u8> {
	self.into_inner().inner
	}
	}

	pub trait OsStrExt {
	fn from_bytes(slice: &[u8]) -> &Self;
	fn as_bytes(&self) -> &[u8];
	}

	impl OsStrExt for OsStr {
	fn from_bytes(slice: &[u8]) -> &OsStr {
	unsafe { mem::transmute(slice) }
	}
	fn as_bytes(&self) -> &[u8] {
	&self.as_inner().inner
	}
	}

	pub fn errno() -> i32 {
	unsafe { libc::errnoGet() }
	}

	pub fn set_errno(e: i32) {
	unsafe {
	libc::errnoSet(e as c_int);
	}
	}

	/// Gets a detailed string description for the given error number.
	pub fn error_string(errno: i32) -> String {
	let mut buf = [0 as c_char; TMPBUF_SZ];
	extern "C" {
	fn strerror_r(errnum: c_int, buf: *mut c_char, buflen: libc::size_t) -> c_int;
	}

	let p = buf.as_mut_ptr();
	unsafe {
	if strerror_r(errno as c_int, p, buf.len()) < 0 {
	panic!("strerror_r failure");
	}
	let p = p as *const _;
	str::from_utf8(CStr::from_ptr(p).to_bytes()).unwrap().to_owned()
	}
	}

	pub fn getcwd() -> io::Result<PathBuf> {
	let mut buf = Vec::with_capacity(512);
	loop {
	unsafe {
	let ptr = buf.as_mut_ptr() as *mut libc::c_char;
	if !libc::getcwd(ptr, buf.capacity() as libc::size_t).is_null() {
	let len = CStr::from_ptr(buf.as_ptr() as *const libc::c_char).to_bytes().len();
	buf.set_len(len);
	buf.shrink_to_fit();
	return Ok(PathBuf::from(OsString::from_vec(buf)));
	} else {
	let error = io::Error::last_os_error();
	if error.raw_os_error() != Some(libc::ERANGE) {
	return Err(error);
	}
	}
	// Trigger the internal buffer resizing logic of `Vec` by requiring
	// more space than the current capacity.
	let cap = buf.capacity();
	buf.set_len(cap);
	buf.reserve(1);
	}
	}
	}

	pub fn chdir(p: &path::Path) -> io::Result<()> {
	let p: &OsStr = p.as_ref();
	let p = CString::new(p.as_bytes())?;
	unsafe {
	match libc::chdir(p.as_ptr()) == (0 as c_int) {
	true => Ok(()),
	false => Err(io::Error::last_os_error()),
	}
	}
	}

	pub struct SplitPaths<'a> {
	iter: iter::Map<slice::Split<'a, u8, fn(&u8) -> bool>, fn(&'a [u8]) -> PathBuf>,
	}

	pub fn split_paths(unparsed: &OsStr) -> SplitPaths<'_> {
	fn bytes_to_path(b: &[u8]) -> PathBuf {
	PathBuf::from(<OsStr as OsStrExt>::from_bytes(b))
	}
	fn is_colon(b: &u8) -> bool {
	*b == b':'
	}
	let unparsed = unparsed.as_bytes();
	SplitPaths {
	iter: unparsed
	.split(is_colon as fn(&u8) -> bool)
	.map(bytes_to_path as fn(&[u8]) -> PathBuf),
	}
	}

	impl<'a> Iterator for SplitPaths<'a> {
	type Item = PathBuf;
	fn next(&mut self) -> Option<PathBuf> {
	self.iter.next()
	}
	fn size_hint(&self) -> (usize, Option<usize>) {
	self.iter.size_hint()
	}
	}

	#[derive(Debug)]
	pub struct JoinPathsError;

	pub fn join_paths<I, T>(paths: I) -> Result<OsString, JoinPathsError>
	where
	I: Iterator<Item = T>,
	T: AsRef<OsStr>,
	{
	let mut joined = Vec::new();
	let sep = b':';

	for (i, path) in paths.enumerate() {
	let path = path.as_ref().as_bytes();
	if i > 0 {
	joined.push(sep)
	}
	if path.contains(&sep) {
	return Err(JoinPathsError);
	}
	joined.extend_from_slice(path);
	}
	Ok(OsStringExt::from_vec(joined))
	}

	impl fmt::Display for JoinPathsError {
	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
	"path segment contains separator `:`".fmt(f)
	}
	}

	impl StdError for JoinPathsError {
	#[allow(deprecated)]
	fn description(&self) -> &str {
	"failed to join paths"
	}
	}

	pub fn current_exe() -> io::Result<PathBuf> {
	#[cfg(test)]
	use realstd::env;

	#[cfg(not(test))]
	use crate::env;

	let exe_path = env::args().next().unwrap();
	let path = Path::new(&exe_path);
	path.canonicalize()
	}

	pub struct Env {
	iter: vec::IntoIter<(OsString, OsString)>,
	_dont_send_or_sync_me: PhantomData<*mut ()>,
	}

	impl Iterator for Env {
	type Item = (OsString, OsString);
	fn next(&mut self) -> Option<(OsString, OsString)> {
	self.iter.next()
	}
	fn size_hint(&self) -> (usize, Option<usize>) {
	self.iter.size_hint()
	}
	}

	pub unsafe fn environ() -> mut const *const c_char {
	extern "C" {
	static mut environ: const const c_char;
	}
	&mut environ
	}

	pub unsafe fn env_lock() -> MutexGuard<'static> {
	// We never call `ENV_LOCK.init()`, so it is UB to attempt to
	// acquire this mutex reentrantly!
	static ENV_LOCK: Mutex = Mutex::new();
	ENV_LOCK.lock()
	}

	/// Returns a vector of (variable, value) byte-vector pairs for all the
	/// environment variables of the current process.
	pub fn env() -> Env {
	unsafe {
	let _guard = env_lock();
	let mut environ = *environ();
	if environ.is_null() {
	panic!("os::env() failure getting env string from OS: {}", io::Error::last_os_error());
	}
	let mut result = Vec::new();
	while !(*environ).is_null() {
	if let Some(key_value) = parse(CStr::from_ptr(*environ).to_bytes()) {
	result.push(key_value);
	}
	environ = environ.add(1);
	}
	return Env { iter: result.into_iter(), _dont_send_or_sync_me: PhantomData };
	}

	fn parse(input: &[u8]) -> Option<(OsString, OsString)> {
	// Strategy (copied from glibc): Variable name and value are separated
	// by an ASCII equals sign '='. Since a variable name must not be
	// empty, allow variable names starting with an equals sign. Skip all
	// malformed lines.
	if input.is_empty() {
	return None;
	}
	let pos = memchr::memchr(b'=', &input[1..]).map(\|p\| p + 1);
	pos.map(\|p\| {
	(
	OsStringExt::from_vec(input[..p].to_vec()),
	OsStringExt::from_vec(input[p + 1..].to_vec()),
	)
	})
	}
	}

	pub fn getenv(k: &OsStr) -> io::Result<Option<OsString>> {
	// environment variables with a nul byte can't be set, so their value is
	// always None as well
	let k = CString::new(k.as_bytes())?;
	unsafe {
	let _guard = env_lock();
	let s = libc::getenv(k.as_ptr()) as *const libc::c_char;
	let ret = if s.is_null() {
	None
	} else {
	Some(OsStringExt::from_vec(CStr::from_ptr(s).to_bytes().to_vec()))
	};
	Ok(ret)
	}
	}

	pub fn setenv(k: &OsStr, v: &OsStr) -> io::Result<()> {
	let k = CString::new(k.as_bytes())?;
	let v = CString::new(v.as_bytes())?;

	unsafe {
	let _guard = env_lock();
	cvt(libc::setenv(k.as_ptr(), v.as_ptr(), 1)).map(drop)
	}
	}

	pub fn unsetenv(n: &OsStr) -> io::Result<()> {
	let nbuf = CString::new(n.as_bytes())?;

	unsafe {
	let _guard = env_lock();
	cvt(libc::unsetenv(nbuf.as_ptr())).map(drop)
	}
	}

	pub fn page_size() -> usize {
	unsafe { libc::sysconf(libc::_SC_PAGESIZE) as usize }
	}

	pub fn temp_dir() -> PathBuf {
	crate::env::var_os("TMPDIR").map(PathBuf::from).unwrap_or_else(\|\| PathBuf::from("/tmp"))
	}

	pub fn home_dir() -> Option<PathBuf> {
	crate::env::var_os("HOME").or_else(\|\| None).map(PathBuf::from)
	}

	pub fn exit(code: i32) -> ! {
	unsafe { libc::exit(code as c_int) }
	}

	pub fn getpid() -> u32 {
	unsafe { libc::getpid() as u32 }
	}

	pub fn getppid() -> u32 {
	unsafe { libc::getppid() as u32 }
	}