POSIX-2017 clarifies that -- and normal option parsing must be supported.
See EXAMPLES in basename(1p).

Signed-off-by: Mattias Andrée <maand...@kth.se>
---
 basename.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/basename.c b/basename.c
index d211799..94a2848 100644
--- a/basename.c
+++ b/basename.c
@@ -17,7 +17,10 @@ main(int argc, char *argv[])
        ssize_t off;
        char *p;
 
-       argv0 = *argv, argv0 ? (argc--, argv++) : (void *)0;
+       ARGBEGIN {
+       default:
+               usage();
+       } ARGEND
 
        if (argc != 1 && argc != 2)
                usage();
-- 
2.11.1


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