Audit hostname(1)

1) Be strict about argc
2) Fix a small error in the manpage

README

@@ -35,7 +35,7 @@ The following tools are implemented ('*' == finished, '#' == UTF-8 support,
 #*  fold            yes                          none
 =*  grep            yes                          none
 =*  head            yes                          none
-=*  hostname        non-posix                    none
+=*| hostname        non-posix                    none
 =*  kill            yes                          none
 =*| link            yes                          none
 =*  ln              yes                          none

hostname.1

@@ -1,4 +1,4 @@
-.Dd January 30, 2015
+.Dd February 28, 2015
 .Dt HOSTNAME 1
 .Os sbase
 .Sh NAME

hostname.c

@@ -21,13 +21,16 @@ main(int argc, char *argv[])
 		usage();
 	} ARGEND;
 
-	if (argc < 1) {
+	if (!argc) {
 		if (gethostname(host, sizeof(host)) < 0)
 			eprintf("gethostname:");
 		puts(host);
-	} else {
+	} else if (argc == 1) {
 		if (sethostname(argv[0], strlen(argv[0])) < 0)
 			eprintf("sethostname:");
+	} else {
+		usage();
 	}
+
 	return 0;
 }