logname implementation

Makefile

@@ -32,6 +32,7 @@ PROGS       := \
   head \
 
 UNIX_PROGS := \
+  logname \
   users \
   whoami \
   tty \

logname/logname.rs

@@ -0,0 +1,85 @@
+#[crate_id(name="logname", version="1.0.0", author="Benoit Benedetti")];
+
+/*
+ * This file is part of the uutils coreutils package.
+ *
+ * (c) Benoit Benedetti <benoit.benedetti@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/* last synced with: logname (GNU coreutils) 8.22 */
+
+#[allow(non_camel_case_types)];
+
+#[feature(macro_rules)];
+
+extern crate extra;
+extern crate getopts;
+
+use std::io::{print, println};
+use std::os;
+use std::str;
+use std::libc;
+
+#[path = "../common/util.rs"] mod util;
+
+extern {
+    // POSIX requires using getlogin (or equivalent code)
+    pub fn getlogin() -> *libc::c_char;
+}
+
+unsafe fn get_userlogin() -> ~str {
+    let login: *libc::c_char = getlogin();
+
+    str::raw::from_c_str(login)
+}
+
+static NAME: &'static str = "logname";
+static VERSION: &'static str = "1.0.0";
+
+fn version() {
+    println(NAME + " " + VERSION);
+}
+
+fn main() {
+    let args = os::args();
+    let program = args[0].clone();
+
+    //
+    // Argument parsing
+    //
+    let opts = ~[
+        getopts::optflag("h", "help", "display this help and exit"),
+        getopts::optflag("V", "version", "output version information and exit"),
+    ];
+
+    let matches = match getopts::getopts(args.tail(), opts) {
+        Ok(m) => m,
+        Err(f) => crash!(1, "Invalid options\n{}", f.to_err_msg())
+    };
+
+    if matches.opt_present("help") {
+        version();
+        println!("");
+        println!("Usage:");
+        println!("  {:s}", program);
+        println!("");
+        print(getopts::usage("print user's login name", opts));
+        return;
+    }
+    if matches.opt_present("version") {
+        version();
+        return;
+    }
+
+    exec();
+}
+
+fn exec() {
+    unsafe {
+        let userlogin = get_userlogin();
+        println!("{:s}", userlogin);
+    }
+}