Support building for Redox

platform/src/lib.rs

@@ -20,7 +20,22 @@ pub mod types;
 
 use core::fmt;
 
-use types::c_int;
+use types::*;
+
+pub unsafe fn c_str(s: *const c_char) -> &'static [u8] {
+    use core::slice;
+
+    let mut size = 0;
+
+    loop {
+        if *s.offset(size) == 0 {
+            break;
+        }
+        size += 1;
+    }
+
+    slice::from_raw_parts(s as *const u8, size as usize)
+}
 
 pub struct FileWriter(pub c_int);
 

platform/src/redox/mod.rs

@@ -1,8 +1,24 @@
+use syscall;
+
+use c_str;
+use types::*;
+
+pub fn close(fd: c_int) -> c_int {
+    syscall::close(fd as usize);
+    0
+}
+
 pub fn exit(status: c_int) -> ! {
-    syscall::exit(status);
+    syscall::exit(status as usize);
+    loop {}
+}
+
+pub fn open(path: *const c_char, oflag: c_int, mode: mode_t) -> c_int {
+    let path = unsafe { c_str(path) };
+    syscall::open(path, (oflag as usize) | (mode as usize)).unwrap() as c_int
 }
 
 pub fn write(fd: c_int, buf: &[u8]) -> ssize_t {
-    syscall::write(fd, buf);
+    syscall::write(fd as usize, buf);
     buf.len() as ssize_t
 }