90fe2805df
Although `Env` (as `Vars`), `Args`, path functions, and OS constants are publicly exposed via `std::env`, their implementations are each self-contained. Keep them separate in `std::sys` and make a new module, `sys::env`, for `Env`.
116 lines
3.2 KiB
Rust
116 lines
3.2 KiB
Rust
use core::slice::memchr;
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use crate::collections::HashMap;
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use crate::ffi::{CStr, OsStr, OsString, c_char};
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use crate::os::hermit::ffi::OsStringExt;
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use crate::sync::Mutex;
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use crate::{fmt, io, vec};
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static ENV: Mutex<Option<HashMap<OsString, OsString>>> = Mutex::new(None);
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pub fn init(env: *const *const c_char) {
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let mut guard = ENV.lock().unwrap();
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let map = guard.insert(HashMap::new());
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if env.is_null() {
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return;
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}
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unsafe {
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let mut environ = env;
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while !(*environ).is_null() {
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if let Some((key, value)) = parse(CStr::from_ptr(*environ).to_bytes()) {
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map.insert(key, value);
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}
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environ = environ.add(1);
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}
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}
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fn parse(input: &[u8]) -> Option<(OsString, OsString)> {
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// Strategy (copied from glibc): Variable name and value are separated
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// by an ASCII equals sign '='. Since a variable name must not be
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// empty, allow variable names starting with an equals sign. Skip all
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// malformed lines.
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if input.is_empty() {
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return None;
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}
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let pos = memchr::memchr(b'=', &input[1..]).map(|p| p + 1);
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pos.map(|p| {
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(
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OsStringExt::from_vec(input[..p].to_vec()),
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OsStringExt::from_vec(input[p + 1..].to_vec()),
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)
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})
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}
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}
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pub struct Env {
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iter: vec::IntoIter<(OsString, OsString)>,
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}
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// FIXME(https://github.com/rust-lang/rust/issues/114583): Remove this when <OsStr as Debug>::fmt matches <str as Debug>::fmt.
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pub struct EnvStrDebug<'a> {
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slice: &'a [(OsString, OsString)],
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}
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impl fmt::Debug for EnvStrDebug<'_> {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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let Self { slice } = self;
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f.debug_list()
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.entries(slice.iter().map(|(a, b)| (a.to_str().unwrap(), b.to_str().unwrap())))
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.finish()
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}
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}
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impl Env {
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pub fn str_debug(&self) -> impl fmt::Debug + '_ {
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let Self { iter } = self;
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EnvStrDebug { slice: iter.as_slice() }
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}
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}
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impl fmt::Debug for Env {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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let Self { iter } = self;
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f.debug_list().entries(iter.as_slice()).finish()
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}
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}
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impl !Send for Env {}
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impl !Sync for Env {}
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impl Iterator for Env {
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type Item = (OsString, OsString);
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fn next(&mut self) -> Option<(OsString, OsString)> {
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self.iter.next()
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}
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fn size_hint(&self) -> (usize, Option<usize>) {
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self.iter.size_hint()
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}
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}
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/// Returns a vector of (variable, value) byte-vector pairs for all the
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/// environment variables of the current process.
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pub fn env() -> Env {
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let guard = ENV.lock().unwrap();
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let env = guard.as_ref().unwrap();
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let result = env.iter().map(|(key, value)| (key.clone(), value.clone())).collect::<Vec<_>>();
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Env { iter: result.into_iter() }
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}
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pub fn getenv(k: &OsStr) -> Option<OsString> {
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ENV.lock().unwrap().as_ref().unwrap().get(k).cloned()
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}
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pub unsafe fn setenv(k: &OsStr, v: &OsStr) -> io::Result<()> {
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let (k, v) = (k.to_owned(), v.to_owned());
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ENV.lock().unwrap().as_mut().unwrap().insert(k, v);
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Ok(())
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}
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pub unsafe fn unsetenv(k: &OsStr) -> io::Result<()> {
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ENV.lock().unwrap().as_mut().unwrap().remove(k);
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Ok(())
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}
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