intcmp(1): rewrite in rust

src/intcmp.rs

@@ -16,18 +16,17 @@
  * along with this program. If not, see https://www.gnu.org/licenses/.
  */
 
-// /* 0b00? */		/*                     Equal | -e  | 0b001 | 1 */
-// #define EQUAL	0x01	/*                   Greater | -g  | 0b010 | 2 */
-// /* 0b0?0 */		/*          Greater or Equal | -ge | 0b011 | 3 */
-// #define GREATER	0x02	/*                      Less | -l  | 0b100 | 4 */
-// /* 0b?00 */		/*             Less or Equal | -le | 0b101 | 5 */
-// #define LESS	0x04	/* Inequal (Greater or Less) | -gl | 0b110 | 6 */
-
 use std::{
 	env::args,
 	process::ExitCode
 };
 
+extern crate getopt;
+use getopt::GetOpt;
+
+extern crate sysexits;
+use sysexits::EX_USAGE;
+
 fn usage(s: &str) -> ExitCode {
 	eprintln!("Usage: {} [-egl] integer integer...", s);
 	ExitCode::from(EX_USAGE as u8)
@@ -54,7 +53,7 @@ fn main() -> ExitCode {
 
 	if argv.len() - optind < 2 /* ref cmp */ { return usage(&argv[0]); }
 
-	let mut reference = None;
+	let mut reference: Option<usize> = None;
 	let mut cmpn: usize;
 
 	for arg in argv.iter().skip(optind) {
@@ -72,6 +71,8 @@ fn main() -> ExitCode {
 					|| (!can_lt && refn < cmpn)
 				{ return ExitCode::FAILURE; }
 		}
+
+		reference = Some(cmpn);
 	}
 
 	ExitCode::SUCCESS