Add Redox scheme prefix

Author: jackpot51

src/libstd/path.rs

@@ -191,6 +191,10 @@ pub enum Prefix<'a> {
     /// Prefix `C:` for the given disk drive.
     #[stable(feature = "rust1", since = "1.0.0")]
     Disk(#[stable(feature = "rust1", since = "1.0.0")] u8),
+
+    /// Scheme `file:` used on Redox
+    #[stable(feature = "rust1", since = "1.0.0")]
+    Scheme(#[stable(feature = "rust1", since = "1.0.0")] &'a OsStr),
 }
 
 impl<'a> Prefix<'a> {
@@ -221,6 +225,7 @@ impl<'a> Prefix<'a> {
             },
             DeviceNS(x) => 4 + os_str_len(x),
             Disk(_) => 2,
+            Scheme(x) => 1 + os_str_len(x),
         }
 
     }

src/libstd/sys/redox/path.rs

@@ -23,10 +23,9 @@ pub fn is_verbatim_sep(b: u8) -> bool {
 
 pub fn parse_prefix(path: &OsStr) -> Option<Prefix> {
     if let Some(path_str) = path.to_str() {
-        if let Some(_i) = path_str.find(':') {
+        if let Some(i) = path_str.find(':') {
             // FIXME: Redox specific prefix
-            // Some(Prefix::Verbatim(OsStr::new(&path_str[..i])))
-            None
+            Some(Prefix::Scheme(OsStr::new(&path_str[..i])))
         } else {
             None
         }