SUS (and apparently 1003.1-2001) say to check optstring for NULL

src/lib/libc/stdlib/getopt.c

@@ -32,7 +32,7 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char *rcsid = "$OpenBSD: getopt.c,v 1.2 1996/08/19 08:33:32 tholo Exp $";
+static char *rcsid = "$OpenBSD: getopt.c,v 1.3 2002/12/08 17:52:26 millert Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <stdio.h>
@@ -63,6 +63,9 @@ getopt(nargc, nargv, ostr)
 	static char *place = EMSG;		/* option letter processing */
 	char *oli;				/* option letter list index */
 
+	if (options == NULL)
+		return (-1);
+
 	if (optreset || !*place) {		/* update scanning pointer */
 		optreset = 0;
 		if (optind >= nargc || *(place = nargv[optind]) != '-') {

src/lib/libc/stdlib/getopt_long.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: getopt_long.c,v 1.9 2002/12/08 17:07:46 millert Exp $	*/
+/*	$OpenBSD: getopt_long.c,v 1.10 2002/12/08 17:52:26 millert Exp $	*/
 /*	$NetBSD: getopt_long.c,v 1.15 2002/01/31 22:43:40 tv Exp $	*/
 
 /*
@@ -64,7 +64,7 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char *rcsid = "$OpenBSD: getopt_long.c,v 1.9 2002/12/08 17:07:46 millert Exp $";
+static char *rcsid = "$OpenBSD: getopt_long.c,v 1.10 2002/12/08 17:52:26 millert Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <err.h>
@@ -301,7 +301,8 @@ getopt_internal(int nargc, char * const *nargv, const char *options,
 	int optchar, short_too;
 	static int posixly_correct = -1;
 
-	optarg = NULL;
+	if (options == NULL)
+		return (-1);
 
 	/*
 	 * Disable GNU extensions if POSIXLY_CORRECT is set or options
@@ -323,6 +324,7 @@ getopt_internal(int nargc, char * const *nargv, const char *options,
 	if (optind == 0)
 		optind = optreset = 1;
 
+	optarg = NULL;
 	if (optreset)
 		nonopt_start = nonopt_end = -1;
 start: