arch: add support for building on Windows

Cargo.toml

@@ -6,7 +6,6 @@ build = "build.rs"
 
 [features]
 unix = [
-  "arch",
   "chgrp",
   "chmod",
   "chown",
@@ -44,7 +43,6 @@ unix = [
 # all utilities in that feature.
 fuchsia = [
   # unix utilities
-  "arch",
   "chgrp",
   "chmod",
   "chown",
@@ -67,6 +65,7 @@ fuchsia = [
   "generic"
 ]
 generic = [
+  "arch",
   "cat",
   "hashsum",
   "join",

src/arch/arch.rs

@@ -19,7 +19,7 @@ static LONG_HELP: &'static str = "";
 
 pub fn uumain(args: Vec<String>) -> i32 {
     new_coreopts!(SYNTAX, SUMMARY, LONG_HELP).parse(args);
-    let uts = Uname::new();
+    let uts = return_if_err!(1, Uname::new());
     println!("{}", uts.machine().trim());
     0
 }

src/uname/uname.rs

@@ -92,7 +92,7 @@ pub fn uumain(args: Vec<String>) -> i32 {
         .get_matches_from(&args);
 
     let argc = args.len();
-    let uname = Uname::new();
+    let uname = return_if_err!(1, Uname::new());
     let mut output = String::new();
 
     if matches.is_present(OPT_KERNELNAME) || matches.is_present(OPT_ALL) || argc == 1 {

src/uucore/Cargo.toml

@@ -8,6 +8,7 @@ getopts = "0.2.14"
 time = { version = "0.1.38", optional = true }
 data-encoding = { version = "^1.1", optional = true }
 libc = { version = "0.2.34", optional = true }
+winapi = { version = "0.3", features = ["sysinfoapi"], optional = true }
 
 [features]
 fs = ["libc"]
@@ -20,7 +21,7 @@ process = ["libc"]
 signals = []
 entries = ["libc"]
 wide = []
-utsname = ["libc"]
+utsname = ["libc", "winapi"]
 default = ["fs", "libc", "utf8", "utsname", "encoding", "parse_time", "mode", "utmpx", "process", "entries", "signals", "wide"]
 
 [lib]

src/uucore/lib.rs

@@ -1,5 +1,7 @@
 #[cfg(feature = "libc")]
 pub extern crate libc;
+#[cfg(feature = "winapi")]
+pub extern crate winapi;
 
 #[macro_use]
 mod macros;
@@ -22,7 +24,7 @@ pub mod parse_time;
 pub mod mode;
 #[cfg(all(unix, not(target_os = "fuchsia"), feature = "utmpx"))]
 pub mod utmpx;
-#[cfg(all(unix, feature = "utsname"))]
+#[cfg(feature = "utsname")]
 pub mod utsname;
 #[cfg(all(unix, feature = "entries"))]
 pub mod entries;

src/uucore/utsname.rs

@@ -6,47 +6,91 @@
 // that was distributed with this source code.
 //
 
-use super::libc::{uname, utsname};
-use ::std::mem;
-use ::std::ffi::CStr;
-use ::std::borrow::Cow;
+pub use self::platform::*;
 
-macro_rules! cstr2cow {
-    ($v:expr) => (
-        unsafe { CStr::from_ptr($v.as_ref().as_ptr()).to_string_lossy() }
-    )
-}
+#[cfg(unix)]
+mod platform {
+    use super::libc::{uname, utsname};
+    use ::std::mem;
+    use ::std::ffi::CStr;
+    use ::std::borrow::Cow;
+    use ::std::io;
 
-pub struct Uname {
-    inner: utsname,
-}
+    macro_rules! cstr2cow {
+        ($v:expr) => (
+            unsafe { CStr::from_ptr($v.as_ref().as_ptr()).to_string_lossy() }
+        )
+    }
 
-impl Uname {
-    pub fn new() -> Self {
-        unsafe {
-            let mut uts: utsname = mem::uninitialized();
-            uname(&mut uts);
-            Uname { inner: uts }
+    pub struct Uname {
+        inner: utsname,
+    }
+
+    impl Uname {
+        pub fn new() -> io::Result<Self> {
+            unsafe {
+                let mut uts: utsname = mem::uninitialized();
+                if uname(&mut uts) == 0 {
+                    Ok(Uname { inner: uts })
+                } else {
+                    Err(io::Error::last_os_error())
+                }
+            }
+        }
+
+        pub fn sysname(&self) -> Cow<str> {
+            cstr2cow!(self.inner.sysname)
+        }
+
+        pub fn nodename(&self) -> Cow<str> {
+            cstr2cow!(self.inner.nodename)
+        }
+
+        pub fn release(&self) -> Cow<str> {
+            cstr2cow!(self.inner.release)
+        }
+
+        pub fn version(&self) -> Cow<str> {
+            cstr2cow!(self.inner.version)
+        }
+
+        pub fn machine(&self) -> Cow<str> {
+            cstr2cow!(self.inner.machine)
         }
     }
-
-    pub fn sysname(&self) -> Cow<str> {
-        cstr2cow!(self.inner.sysname)
-    }
-
-    pub fn nodename(&self) -> Cow<str> {
-        cstr2cow!(self.inner.nodename)
-    }
-
-    pub fn release(&self) -> Cow<str> {
-        cstr2cow!(self.inner.release)
-    }
-
-    pub fn version(&self) -> Cow<str> {
-        cstr2cow!(self.inner.version)
-    }
-
-    pub fn machine(&self) -> Cow<str> {
-        cstr2cow!(self.inner.machine)
-    }
 }
+
+#[cfg(windows)]
+mod platform {
+    use ::winapi::um::sysinfoapi::{SYSTEM_INFO, GetSystemInfo};
+    use ::winapi::um::winnt::*;
+    use ::std::mem;
+    use ::std::borrow::Cow;
+    use ::std::io;
+
+    pub struct Uname {
+        inner: SYSTEM_INFO
+    }
+
+    impl Uname {
+        pub fn new() -> io::Result<Uname> {
+            unsafe {
+                let mut info = mem::uninitialized();
+                GetSystemInfo(&mut info);
+                Ok(Uname { inner: info })
+            }
+        }
+
+        // FIXME: need to implement more architectures (e.g. ARM)
+        pub fn machine(&self) -> Cow<str> {
+            let arch = unsafe {
+                match self.inner.u.s().wProcessorArchitecture {
+                    PROCESSOR_ARCHITECTURE_AMD64 => "x86_64",
+                    PROCESSOR_ARCHITECTURE_INTEL => "x86",
+                    _ => unimplemented!()
+                }
+            };
+            Cow::from(arch)
+        }
+    }
+}