swab(1): untested move to new getopt bindings

src/swab.rs

@@ -49,13 +49,10 @@ fn main() -> ExitCode {
 	let mut force = false;
 	let mut wordsize: usize = 2;
 
-	loop {
-		match opts.next() {
-			None => break,
-			Some(opt) =>
-				match opt {
-					Ok(Opt('f', None)) => force = true,
-					Ok(Opt('w', Some(arg))) => {
+	while let Some(opt) = argv.getopt("fw:") {
+		match opt.opt() {
+			Ok("f") => force = true,
+			Ok("w") => {
 					match arg.parse::<usize>() {
 						Ok(w) if w % 2 == 0 => { wordsize = w; () },
 						_ => { return usage(&argv[0]); },
@@ -64,7 +61,6 @@ fn main() -> ExitCode {
 			_ => { return usage(&argv[0]); }
 		}
 	}
-	}
 
 	buf.resize(wordsize, 0);