Include <getopt.h>.

(main): Reject unknown options.

1 files changed, 7 insertions, 11 deletions

diff --git a/src/dirname.c b/src/dirname.c
index 552b6da0d..40a9b29ce 100644
--- a/src/dirname.c
+++ b/src/dirname.c
@@ -18,6 +18,7 @@
 /* Written by David MacKenzie and Jim Meyering. */
 
 #include <config.h>
+#include <getopt.h>
 #include <stdio.h>
 #include <sys/types.h>
 
@@ -77,27 +78,22 @@ main (int argc, char **argv)
 
   parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION,
 		      usage, AUTHORS, (char const *) NULL);
-  /* The above handles --help and --version.
-     Since there is no other invocation of getopt, handle `--' here.  */
-  if (argc > 1 && STREQ (argv[1], "--"))
-    {
-      --argc;
-      ++argv;
-    }
+  if (getopt (argc, argv, "+") != -1)
+    usage (EXIT_FAILURE);
 
-  if (argc < 2)
+  if (argc < optind + 1)
     {
       error (0, 0, _("missing operand"));
       usage (EXIT_FAILURE);
     }
 
-  if (2 < argc)
+  if (optind + 1 < argc)
     {
-      error (0, 0, _("extra operand %s"), quote (argv[2]));
+      error (0, 0, _("extra operand %s"), quote (argv[optind + 1]));
       usage (EXIT_FAILURE);
     }
 
-  result = argv[1];
+  result = argv[optind];
   len = dir_len (result);
 
   if (! len)