Merge pull request #31 from alan-andrade/hostname

hostname implementation

Makefile

@@ -29,6 +29,7 @@ PROGS       := \
   wc \
   yes \
   tty \
+  hostname \
 
 UNIX_PROGS := \
   whoami \

hostname/hostname.rs

@@ -0,0 +1,99 @@
+#[crate_id(name="hostname", vers="1.0.0", author="Alan Andrade")];
+/*
+ * This file is part of the uutils coreutils package.
+ *
+ * (c) Alan Andrade <alan.andradec@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * Synced with:
+ *
+ * https://www.opensource.apple.com/source/shell_cmds/shell_cmds-170/hostname/hostname.c?txt
+ */
+
+extern mod extra;
+extern mod getopts;
+
+use std::{os,libc,vec,str};
+use getopts::{optflag, getopts, usage};
+
+extern {
+    fn gethostname(name: *libc::c_char, namelen: libc::size_t) -> libc::c_int;
+    fn sethostname(name: *libc::c_char, namelen: libc::c_int) -> libc::c_int;
+}
+
+fn main () {
+    let args = os::args();
+    let program = args[0].to_owned();
+
+    let options = [
+        optflag("f", "full", "Default option to show full name"),
+        optflag("s", "slice subdomain", "Cuts the subdomain off if any"),
+        optflag("h", "help", "Show help"),
+        optflag("V", "version", "Show program's version")
+    ];
+
+    let matches = match getopts(args.tail(), options) {
+        Ok(m) => { m }
+        _ => { println!("{:s}", usage(program, options)); return; }
+    };
+
+    if matches.opt_present("h") {
+        println!("{:s}", usage(program, options));
+        return
+    }
+    if matches.opt_present("V") { version(); return }
+
+    match matches.free.len() {
+        0 => {
+            let hostname: ~str = xgethostname();
+
+            if matches.opt_present("s") {
+                let pos = hostname.find_str(".");
+                if pos.is_some() {
+                    println!("{:s}", hostname.slice_to(pos.unwrap()));
+                    return;
+                }
+            }
+
+            println!("{:s}", hostname);
+        }
+        1 => { xsethostname( matches.free.last().unwrap() ) }
+        _ => { println!("{:s}", usage(program, options)); }
+    };
+}
+
+fn version() {
+    println!("hostname version 1.0.0");
+}
+
+fn xgethostname() -> ~str {
+    let namelen = 255u;
+    let mut name = vec::from_elem(namelen, 0u8);
+
+    let err = unsafe {
+        gethostname (name.as_mut_ptr() as *libc::c_char,
+                                        namelen as libc::size_t)
+    };
+
+    if err != 0 {
+        fail!("Cannot determine hostname");
+    }
+
+    let last_char = name.iter().position(|byte| *byte == 0).unwrap_or(namelen);
+
+    str::from_utf8(name.slice_to(last_char)).unwrap().to_owned()
+}
+
+fn xsethostname(name: &~str) {
+    let vec_name: ~[libc::c_char] = name.bytes().map(|c| c as i8).collect();
+
+    let err = unsafe {
+        sethostname (vec_name.as_ptr(), vec_name.len() as i32)
+    };
+
+    if err != 0 {
+        println!("Cannot set hostname to {:s}", *name);
+    }
+}