Cleanup Redox repo, update Rust, remove old target

kernel/src/scheme/env.rs

@@ -0,0 +1,193 @@
+use alloc::arc::Arc;
+use collections::{BTreeMap, Vec};
+use core::{cmp, str};
+use core::sync::atomic::{AtomicUsize, Ordering};
+use spin::{Mutex, RwLock};
+
+use context;
+use syscall::data::Stat;
+use syscall::error::*;
+use syscall::flag::{MODE_FILE, SEEK_SET, SEEK_CUR, SEEK_END};
+use syscall::scheme::Scheme;
+
+#[derive(Clone)]
+struct Handle {
+    data: Arc<Mutex<Vec<u8>>>,
+    mode: u16,
+    seek: usize
+}
+
+pub struct EnvScheme {
+    next_id: AtomicUsize,
+    handles: RwLock<BTreeMap<usize, Handle>>
+}
+
+impl EnvScheme {
+    pub fn new() -> EnvScheme {
+        EnvScheme {
+            next_id: AtomicUsize::new(0),
+            handles: RwLock::new(BTreeMap::new())
+        }
+    }
+}
+
+impl Scheme for EnvScheme {
+    fn open(&self, path: &[u8], _flags: usize, _uid: u32, _gid: u32) -> Result<usize> {
+        let path = str::from_utf8(path).map_err(|_err| Error::new(ENOENT))?.trim_matches('/');
+
+        let env_lock = {
+            let contexts = context::contexts();
+            let context_lock = contexts.current().ok_or(Error::new(ESRCH))?;
+            let context = context_lock.read();
+            context.env.clone()
+        };
+
+        if path.is_empty() {
+            let mut list = Vec::new();
+            {
+                let env = env_lock.lock();
+                for entry in env.iter() {
+                    if ! list.is_empty() {
+                        list.push(b'\n');
+                    }
+                    list.extend_from_slice(&entry.0);
+                    list.push(b'=');
+                    list.extend_from_slice(&entry.1.lock());
+                }
+            }
+
+            let id = self.next_id.fetch_add(1, Ordering::SeqCst);
+            self.handles.write().insert(id, Handle {
+                data: Arc::new(Mutex::new(list)),
+                mode: MODE_FILE,
+                seek: 0
+            });
+
+            Ok(id)
+        } else {
+            let data = {
+                let mut env = env_lock.lock();
+                if env.contains_key(path.as_bytes()) {
+                    env[path.as_bytes()].clone()
+                } else /*if flags & O_CREAT == O_CREAT*/ {
+                    let name = path.as_bytes().to_vec().into_boxed_slice();
+                    let data = Arc::new(Mutex::new(Vec::new()));
+                    env.insert(name, data.clone());
+                    data
+                }
+            };
+
+            let id = self.next_id.fetch_add(1, Ordering::SeqCst);
+            self.handles.write().insert(id, Handle {
+                data: data,
+                mode: MODE_FILE,
+                seek: 0
+            });
+
+            Ok(id)
+        }
+    }
+
+    fn dup(&self, id: usize, _buf: &[u8]) -> Result<usize> {
+        let new_handle = {
+            let handles = self.handles.read();
+            let handle = handles.get(&id).ok_or(Error::new(EBADF))?;
+            handle.clone()
+        };
+
+        let id = self.next_id.fetch_add(1, Ordering::SeqCst);
+        self.handles.write().insert(id, new_handle);
+
+        Ok(id)
+    }
+
+    fn read(&self, id: usize, buffer: &mut [u8]) -> Result<usize> {
+        let mut handles = self.handles.write();
+        let mut handle = handles.get_mut(&id).ok_or(Error::new(EBADF))?;
+
+        let data = handle.data.lock();
+
+        let mut i = 0;
+        while i < buffer.len() && handle.seek < data.len() {
+            buffer[i] = data[handle.seek];
+            i += 1;
+            handle.seek += 1;
+        }
+
+        Ok(i)
+    }
+
+    fn write(&self, id: usize, buffer: &[u8]) -> Result<usize> {
+        let mut handles = self.handles.write();
+        let mut handle = handles.get_mut(&id).ok_or(Error::new(EBADF))?;
+
+        let mut data = handle.data.lock();
+
+        let mut i = 0;
+        while i < buffer.len() && handle.seek < data.len() {
+            data[handle.seek] = buffer[i];
+            i += 1;
+            handle.seek += 1;
+        }
+
+        while i < buffer.len() {
+            data.push(buffer[i]);
+            i += 1;
+            handle.seek += 1;
+        }
+
+        Ok(i)
+    }
+
+    fn seek(&self, id: usize, pos: usize, whence: usize) -> Result<usize> {
+        let mut handles = self.handles.write();
+        let mut handle = handles.get_mut(&id).ok_or(Error::new(EBADF))?;
+
+        let len = handle.data.lock().len();
+        handle.seek = match whence {
+            SEEK_SET => cmp::min(len, pos),
+            SEEK_CUR => cmp::max(0, cmp::min(len as isize, handle.seek as isize + pos as isize)) as usize,
+            SEEK_END => cmp::max(0, cmp::min(len as isize, len as isize + pos as isize)) as usize,
+            _ => return Err(Error::new(EINVAL))
+        };
+
+        Ok(handle.seek)
+    }
+
+    fn fstat(&self, id: usize, stat: &mut Stat) -> Result<usize> {
+        let handles = self.handles.read();
+        let handle = handles.get(&id).ok_or(Error::new(EBADF))?;
+
+        stat.st_mode = handle.mode;
+        stat.st_size = handle.data.lock().len() as u64;
+
+        Ok(0)
+    }
+
+    fn fsync(&self, id: usize) -> Result<usize> {
+        let handles = self.handles.read();
+        let _handle = handles.get(&id).ok_or(Error::new(EBADF))?;
+
+        Ok(0)
+    }
+
+    fn ftruncate(&self, id: usize, len: usize) -> Result<usize> {
+        let handles = self.handles.read();
+        let handle = handles.get(&id).ok_or(Error::new(EBADF))?;
+
+        let mut data = handle.data.lock();
+        if len < data.len() {
+            data.truncate(len)
+        } else {
+            while len > data.len() {
+                data.push(0);
+            }
+        }
+
+        Ok(0)
+    }
+
+    fn close(&self, id: usize) -> Result<usize> {
+        self.handles.write().remove(&id).ok_or(Error::new(EBADF)).and(Ok(0))
+    }
+}