1 files changed, 193 insertions, 0 deletions
diff --git a/library/std/src/sys/solid/os.rs b/library/std/src/sys/solid/os.rs
new file mode 100644
index 000000000..b5649d6e0
--- /dev/null
+++ b/library/std/src/sys/solid/os.rs
@@ -0,0 +1,193 @@
+use super::unsupported;
+use crate::error::Error as StdError;
+use crate::ffi::{CStr, CString, 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::sys_common::rwlock::StaticRwLock;
+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<PathBuf> {
+    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<PathBuf> {
+        *self.0
+    }
+}
+
+#[derive(Debug)]
+pub struct JoinPathsError;
+
+pub fn join_paths<I, T>(_paths: I) -> Result<OsString, JoinPathsError>
+where
+    I: Iterator<Item = T>,
+    T: AsRef<OsStr>,
+{
+    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<PathBuf> {
+    unsupported()
+}
+
+static ENV_LOCK: StaticRwLock = StaticRwLock::new();
+
+pub struct Env {
+    iter: vec::IntoIter<(OsString, OsString)>,
+}
+
+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<usize>) {
+        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_LOCK.read();
+        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<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()).ok()?;
+    unsafe {
+        let _guard = ENV_LOCK.read();
+        let s = libc::getenv(k.as_ptr()) as *const libc::c_char;
+        if s.is_null() {
+            None
+        } else {
+            Some(OsStringExt::from_vec(CStr::from_ptr(s).to_bytes().to_vec()))
+        }
+    }
+}
+
+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.write();
+        cvt_env(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.write();
+        cvt_env(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<c_int> {
+    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<PathBuf> {
+    None
+}
+
+pub fn exit(code: i32) -> ! {
+    rtabort!("exit({}) called", code);
+}
+
+pub fn getpid() -> u32 {
+    panic!("no pids on this platform")
+}