use super::unsupported; use crate::error::Error as StdError; use crate::ffi::{CStr, OsStr, OsString}; use crate::fmt; use crate::io; use crate::os::{ raw::{c_char, c_int}, solid::ffi::{OsStrExt, OsStringExt}, }; use crate::path::{self, PathBuf}; use crate::sync::{PoisonError, RwLock}; use crate::sys::common::small_c_string::run_with_cstr; use crate::vec; use super::{error, itron, memchr}; // `solid` directly maps `errno`s to μITRON error codes. impl itron::error::ItronError { #[inline] pub(crate) fn as_io_error(self) -> crate::io::Error { crate::io::Error::from_raw_os_error(self.as_raw()) } } pub fn errno() -> i32 { 0 } pub fn error_string(errno: i32) -> String { if let Some(name) = error::error_name(errno) { name.to_owned() } else { format!("{errno}") } } pub fn getcwd() -> io::Result { unsupported() } pub fn chdir(_: &path::Path) -> io::Result<()> { unsupported() } pub struct SplitPaths<'a>(&'a !); pub fn split_paths(_unparsed: &OsStr) -> SplitPaths<'_> { panic!("unsupported") } impl<'a> Iterator for SplitPaths<'a> { type Item = PathBuf; fn next(&mut self) -> Option { *self.0 } } #[derive(Debug)] pub struct JoinPathsError; pub fn join_paths(_paths: I) -> Result where I: Iterator, T: AsRef, { Err(JoinPathsError) } impl fmt::Display for JoinPathsError { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { "not supported on this platform yet".fmt(f) } } impl StdError for JoinPathsError { #[allow(deprecated)] fn description(&self) -> &str { "not supported on this platform yet" } } pub fn current_exe() -> io::Result { unsupported() } static ENV_LOCK: RwLock<()> = RwLock::new(()); pub fn env_read_lock() -> impl Drop { ENV_LOCK.read().unwrap_or_else(PoisonError::into_inner) } pub struct Env { iter: vec::IntoIter<(OsString, OsString)>, } // FIXME(https://github.com/rust-lang/rust/issues/114583): Remove this when ::fmt matches ::fmt. pub struct EnvStrDebug<'a> { slice: &'a [(OsString, OsString)], } impl fmt::Debug for EnvStrDebug<'_> { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { let Self { slice } = self; f.debug_list() .entries(slice.iter().map(|(a, b)| (a.to_str().unwrap(), b.to_str().unwrap()))) .finish() } } impl Env { pub fn str_debug(&self) -> impl fmt::Debug + '_ { let Self { iter } = self; EnvStrDebug { slice: iter.as_slice() } } } impl fmt::Debug for Env { fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { let Self { iter } = self; f.debug_list().entries(iter.as_slice()).finish() } } impl !Send for Env {} impl !Sync for Env {} impl Iterator for Env { type Item = (OsString, OsString); fn next(&mut self) -> Option<(OsString, OsString)> { self.iter.next() } fn size_hint(&self) -> (usize, Option) { self.iter.size_hint() } } /// Returns a vector of (variable, value) byte-vector pairs for all the /// environment variables of the current process. pub fn env() -> Env { extern "C" { static mut environ: *const *const c_char; } unsafe { let _guard = env_read_lock(); let mut result = Vec::new(); if !environ.is_null() { 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() }; } 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) -> Option { // environment variables with a nul byte can't be set, so their value is // always None as well run_with_cstr(k.as_bytes(), |k| { let _guard = env_read_lock(); let v = unsafe { libc::getenv(k.as_ptr()) } as *const libc::c_char; if v.is_null() { Ok(None) } else { // SAFETY: `v` cannot be mutated while executing this line since we've a read lock let bytes = unsafe { CStr::from_ptr(v) }.to_bytes().to_vec(); Ok(Some(OsStringExt::from_vec(bytes))) } }) .ok() .flatten() } pub fn setenv(k: &OsStr, v: &OsStr) -> io::Result<()> { run_with_cstr(k.as_bytes(), |k| { run_with_cstr(v.as_bytes(), |v| { let _guard = ENV_LOCK.write(); cvt_env(unsafe { libc::setenv(k.as_ptr(), v.as_ptr(), 1) }).map(drop) }) }) } pub fn unsetenv(n: &OsStr) -> io::Result<()> { run_with_cstr(n.as_bytes(), |nbuf| { let _guard = ENV_LOCK.write(); cvt_env(unsafe { libc::unsetenv(nbuf.as_ptr()) }).map(drop) }) } /// In kmclib, `setenv` and `unsetenv` don't always set `errno`, so this /// function just returns a generic error. fn cvt_env(t: c_int) -> io::Result { if t == -1 { Err(io::const_io_error!(io::ErrorKind::Uncategorized, "failure")) } else { Ok(t) } } pub fn temp_dir() -> PathBuf { panic!("no standard temporary directory on this platform") } pub fn home_dir() -> Option { None } pub fn exit(code: i32) -> ! { rtabort!("exit({}) called", code); } pub fn getpid() -> u32 { panic!("no pids on this platform") }