getopt(3): recognize option:: as GNU extension for "optional options".

Also ANSIfy a function declaration.

While here update the OpenBSD patch level in getopt_long.c as we
already have the corresponding change.

Obtained from:	NetBSD
MFC after:	2 weeks

3 files changed, 22 insertions, 8 deletions

diff --git a/lib/libc/stdlib/getopt.3 b/lib/libc/stdlib/getopt.3
index 03a63abb19c5..76ed7d5d2436 100644
--- a/lib/libc/stdlib/getopt.3
+++ b/lib/libc/stdlib/getopt.3
@@ -1,4 +1,4 @@
-.\"	$NetBSD: getopt.3,v 1.31 2003/09/23 10:26:54 wiz Exp $
+.\"	$NetBSD: getopt.3,v 1.34 2014/06/05 22:09:50 wiz Exp $
 .\"
 .\" Copyright (c) 1988, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -30,7 +30,7 @@
 .\"     @(#)getopt.3	8.5 (Berkeley) 4/27/95
 .\" $FreeBSD$
 .\"
-.Dd April 27, 1995
+.Dd June 5, 2014
 .Dt GETOPT 3
 .Os
 .Sh NAME
@@ -65,6 +65,17 @@ The option string
 may contain the following elements: individual characters, and
 characters followed by a colon to indicate an option argument
 is to follow.
+If an individual character is followed by two colons, then the
+option argument is optional;
+.Va optarg
+is set to the rest of the current
+.Va argv
+word, or
+.Dv NULL
+if there were no more characters in the current word.
+This is a
+.Nx
+extension.
 For example, an option string
 .Li \&"x"
 recognizes an option
diff --git a/lib/libc/stdlib/getopt.c b/lib/libc/stdlib/getopt.c
index b9d2ae31fc64..3929b321dca9 100644
--- a/lib/libc/stdlib/getopt.c
+++ b/lib/libc/stdlib/getopt.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc Exp $	*/
+/*	$NetBSD: getopt.c,v 1.29 2014/06/05 22:00:22 christos Exp $	*/
 
 /*
  * Copyright (c) 1987, 1993, 1994
@@ -59,10 +59,7 @@ char	*optarg;		/* argument associated with option */
  *	Parse argc/argv argument vector.
  */
 int
-getopt(nargc, nargv, ostr)
-	int nargc;
-	char * const nargv[];
-	const char *ostr;
+getopt(int nargc, char * const nargv[], const char *ostr)
 {
 	static char *place = EMSG;		/* option letter processing */
 	char *oli;				/* option letter list index */
@@ -115,6 +112,12 @@ getopt(nargc, nargv, ostr)
 		   entire next argument. */
 		if (*place)
 			optarg = place;
+		else if (oli[2] == ':')
+			/*
+			 * GNU Extension, for optional arguments if the rest of
+			 * the argument is empty, we return NULL
+			 */
+			optarg = NULL;
 		else if (nargc > ++optind)
 			optarg = nargv[optind];
 		else {
diff --git a/lib/libc/stdlib/getopt_long.c b/lib/libc/stdlib/getopt_long.c
index 9f7f6d5ae733..3b7f693e3278 100644
--- a/lib/libc/stdlib/getopt_long.c
+++ b/lib/libc/stdlib/getopt_long.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: getopt_long.c,v 1.22 2006/10/04 21:29:04 jmc Exp $	*/
+/*	$OpenBSD: getopt_long.c,v 1.23 2007/10/31 12:34:57 chl Exp $	*/
 /*	$NetBSD: getopt_long.c,v 1.15 2002/01/31 22:43:40 tv Exp $	*/
 
 /*