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Re: /bin/hostname options/arguments



On Thu, Mar 09, 2006 at 10:57:47AM +0100, Przemyslaw Nowaczyk wrote:
> hi,
> I've got a question about hostname arguments.. the hostname(1) says:
> "hostname - set *or* print name of current host system" so as I understand it
> something like: 'hostname -s new_name' shouldn't be allowed right? becouse we
> acctually don't know what to do (set or print, assuming we're running root)..
> if I'm right - here's a diff to change that behavior (with some KNF fixups)..
> if not - sorry for spamming..
> 
> <snip>
> 
> and one more thing.. if I'm right, shouldn't the usage args look like
> usage: hostname [-s | name-of-host]?
> 

here're all the changes (to man page too).. could somebody verify if my idea
is right..?

Index: hostname.1
===================================================================
RCS file: /cvs/src/bin/hostname/hostname.1,v
retrieving revision 1.18
diff -u -r1.18 hostname.1
--- hostname.1	2003/12/03 14:06:08	1.18
+++ hostname.1	2006/03/09 17:49:16
@@ -38,8 +38,7 @@
 .Nd set or print name of current host system
 .Sh SYNOPSIS
 .Nm hostname
-.Op Fl s
-.Op Ar name-of-host
+.Op Fl s | Ar name-of-host
 .Sh DESCRIPTION
 The
 .Nm
Index: hostname.c
===================================================================
RCS file: /cvs/src/bin/hostname/hostname.c,v
retrieving revision 1.7
diff -u -r1.7 hostname.c
--- hostname.c	2003/06/02 23:32:08	1.7
+++ hostname.c	2006/03/09 17:49:16
@@ -52,15 +52,13 @@
 #include <string.h>
 #include <unistd.h>
 
-extern	char *__progname;
+__dead void usage(void);
 
-void usage(void);
-
 int
 main(int argc, char *argv[])
 {
-	int ch, sflag;
-	char *p, hostname[MAXHOSTNAMELEN];
+	int	 ch, sflag;
+	char	*p, hostname[MAXHOSTNAMELEN];
 
 	sflag = 0;
 	while ((ch = getopt(argc, argv, "s")) != -1)
@@ -70,6 +68,7 @@
 			break;
 		default:
 			usage();
+			/* NOTREACHED */
 		}
 	argc -= optind;
 	argv += optind;
@@ -78,6 +77,8 @@
 		usage();
 
 	if (*argv) {
+		if (sflag)
+			usage();
 		if (sethostname(*argv, strlen(*argv)))
 			err(1, "sethostname");
 	} else {
@@ -90,9 +91,11 @@
 	exit(0);
 }
 
-void
+__dead void
 usage(void)
 {
-	(void)fprintf(stderr, "usage: %s [-s] [name-of-host]\n", __progname);
+	extern char	*__progname;
+
+	(void)fprintf(stderr, "usage: %s [-s | name-of-host]\n", __progname);
 	exit(1);
 }

-- 
Przemyslaw Nowaczyk <p_nowaczyk_(_at_)_o2_(_dot_)_pl>
CS student @ Poznan University of Technology



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