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https://github.com/RGBCube/uutils-coreutils
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Merge pull request #31 from alan-andrade/hostname
hostname implementation
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commit
79acabb381
2 changed files with 100 additions and 0 deletions
1
Makefile
1
Makefile
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@ -29,6 +29,7 @@ PROGS := \
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wc \
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wc \
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yes \
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yes \
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tty \
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tty \
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hostname \
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UNIX_PROGS := \
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UNIX_PROGS := \
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whoami \
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whoami \
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99
hostname/hostname.rs
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99
hostname/hostname.rs
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@ -0,0 +1,99 @@
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#[crate_id(name="hostname", vers="1.0.0", author="Alan Andrade")];
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/*
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* This file is part of the uutils coreutils package.
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*
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* (c) Alan Andrade <alan.andradec@gmail.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*
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* Synced with:
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*
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* https://www.opensource.apple.com/source/shell_cmds/shell_cmds-170/hostname/hostname.c?txt
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*/
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extern mod extra;
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extern mod getopts;
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use std::{os,libc,vec,str};
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use getopts::{optflag, getopts, usage};
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extern {
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fn gethostname(name: *libc::c_char, namelen: libc::size_t) -> libc::c_int;
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fn sethostname(name: *libc::c_char, namelen: libc::c_int) -> libc::c_int;
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}
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fn main () {
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let args = os::args();
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let program = args[0].to_owned();
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let options = [
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optflag("f", "full", "Default option to show full name"),
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optflag("s", "slice subdomain", "Cuts the subdomain off if any"),
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optflag("h", "help", "Show help"),
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optflag("V", "version", "Show program's version")
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];
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let matches = match getopts(args.tail(), options) {
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Ok(m) => { m }
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_ => { println!("{:s}", usage(program, options)); return; }
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};
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if matches.opt_present("h") {
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println!("{:s}", usage(program, options));
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return
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}
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if matches.opt_present("V") { version(); return }
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match matches.free.len() {
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0 => {
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let hostname: ~str = xgethostname();
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if matches.opt_present("s") {
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let pos = hostname.find_str(".");
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if pos.is_some() {
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println!("{:s}", hostname.slice_to(pos.unwrap()));
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return;
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}
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}
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println!("{:s}", hostname);
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}
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1 => { xsethostname( matches.free.last().unwrap() ) }
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_ => { println!("{:s}", usage(program, options)); }
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};
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}
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fn version() {
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println!("hostname version 1.0.0");
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}
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fn xgethostname() -> ~str {
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let namelen = 255u;
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let mut name = vec::from_elem(namelen, 0u8);
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let err = unsafe {
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gethostname (name.as_mut_ptr() as *libc::c_char,
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namelen as libc::size_t)
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};
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if err != 0 {
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fail!("Cannot determine hostname");
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}
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let last_char = name.iter().position(|byte| *byte == 0).unwrap_or(namelen);
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str::from_utf8(name.slice_to(last_char)).unwrap().to_owned()
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}
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fn xsethostname(name: &~str) {
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let vec_name: ~[libc::c_char] = name.bytes().map(|c| c as i8).collect();
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let err = unsafe {
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sethostname (vec_name.as_ptr(), vec_name.len() as i32)
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};
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if err != 0 {
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println!("Cannot set hostname to {:s}", *name);
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}
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}
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