Add uucore::utsname to get system info

src/uucore/Cargo.toml

@@ -18,12 +18,12 @@ utf8 = []
 encoding = ["data-encoding"]
 parse_time = []
 utmpx = ["time", "libc"]
-c_types = ["libc"]
 process = ["libc"]
 signals = []
 entries = ["libc"]
 wide = []
-default = ["fs", "libc", "utf8", "encoding", "parse_time", "utmpx", "c_types", "process", "entries", "signals", "wide"]
+utsname = ["libc"]
+default = ["fs", "libc", "utf8", "utsname", "encoding", "parse_time", "utmpx", "process", "entries", "signals", "wide"]
 
 [lib]
 path = "lib.rs"

src/uucore/lib.rs

@@ -20,6 +20,8 @@ pub mod parse_time;
 pub mod utmpx;
 #[cfg(all(unix, feature = "c_types"))]
 pub mod c_types;
+#[cfg(all(unix, feature = "utsname"))]
+pub mod utsname;
 #[cfg(all(unix, feature = "entries"))]
 pub mod entries;
 #[cfg(all(unix, feature = "process"))]

src/uucore/utsname.rs

@@ -0,0 +1,52 @@
+// This file is part of the uutils coreutils package.
+//
+// (c) Jian Zeng <anonymousknight96 AT gmail.com>
+//
+// For the full copyright and license information, please view the LICENSE file
+// that was distributed with this source code.
+//
+
+use super::libc::{uname, utsname};
+use ::std::mem;
+use ::std::ffi::CStr;
+use ::std::borrow::Cow;
+
+macro_rules! cstr2cow {
+    ($v:expr) => (
+        unsafe { CStr::from_ptr($v.as_ref().as_ptr()).to_string_lossy() }
+    )
+}
+
+pub struct Uname {
+    inner: utsname,
+}
+
+impl Uname {
+    pub fn new() -> Self {
+        unsafe {
+            let mut uts: utsname = mem::uninitialized();
+            uname(&mut uts);
+            Uname { inner: uts }
+        }
+    }
+
+    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)
+    }
+}