Fix PR 6267: recheck POSIXLY_CORRECT each time getopt_long() starts a new

argv and don't suppress the handling of leading '-' in optstring when
POSIXLY_CORRECT is set.
Based on patch from Eric Blake.
ok and manpage update from millert@, manpage ok jmc@

src/lib/libc/stdlib/getopt.3

@@ -25,9 +25,9 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.\"	$OpenBSD: getopt.3,v 1.41 2009/04/12 23:13:36 okan Exp $
+.\"	$OpenBSD: getopt.3,v 1.42 2011/03/05 22:10:11 guenther Exp $
 .\"
-.Dd $Mdocdate: April 12 2009 $
+.Dd $Mdocdate: March 5 2011 $
 .Dt GETOPT 3
 .Os
 .Sh NAME
@@ -158,15 +158,6 @@ is set to the character that caused the error.
 The
 .Fn getopt
 function returns \-1 when the argument list is exhausted.
-.Sh ENVIRONMENT
-.Bl -tag -width POSIXLY_CORRECTXX
-.It Ev POSIXLY_CORRECT
-If set, a leading
-.Sq -
-in
-.Ar optstring
-is ignored.
-.El
 .Sh EXAMPLES
 The following code accepts the options
 .Fl b

src/lib/libc/stdlib/getopt_long.3

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: getopt_long.3,v 1.17 2011/01/24 01:50:25 schwarze Exp $
+.\"	$OpenBSD: getopt_long.3,v 1.18 2011/03/05 22:10:11 guenther Exp $
 .\"	$NetBSD: getopt_long.3,v 1.11 2002/10/02 10:54:19 wiz Exp $
 .\"
 .\" Copyright (c) 1988, 1991, 1993
@@ -30,7 +30,7 @@
 .\"
 .\"     @(#)getopt.3	8.5 (Berkeley) 4/27/95
 .\"
-.Dd $Mdocdate: January 24 2011 $
+.Dd $Mdocdate: March 5 2011 $
 .Dt GETOPT_LONG 3
 .Os
 .Sh NAME
@@ -211,23 +211,6 @@ found in glibc-2.1.3:
 .It
 handling of
 .Ql -
-as the first character of the option string in the presence of the
-environment variable
-.Ev POSIXLY_CORRECT :
-.Bl -tag -width "OpenBSD"
-.It GNU
-ignores
-.Ev POSIXLY_CORRECT
-and returns non-options as arguments to option
-.Ql \e1 .
-.It OpenBSD
-honors
-.Ev POSIXLY_CORRECT
-and stops at the first non-option.
-.El
-.It
-handling of
-.Ql -
 within the option string (not the first character):
 .Bl -tag -width "OpenBSD"
 .It GNU
@@ -402,8 +385,6 @@ relative to current positions) are the same, though.
 .It Ev POSIXLY_CORRECT
 If set, option processing stops when the first non-option is found and
 a leading
-.Sq -
-or
 .Sq +
 in the
 .Ar optstring

src/lib/libc/stdlib/getopt_long.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: getopt_long.c,v 1.24 2010/07/22 19:31:53 blambert Exp $	*/
+/*	$OpenBSD: getopt_long.c,v 1.25 2011/03/05 22:10:11 guenther Exp $	*/
 /*	$NetBSD: getopt_long.c,v 1.15 2002/01/31 22:43:40 tv Exp $	*/
 
 /*
@@ -284,26 +284,26 @@ getopt_internal(int nargc, char * const *nargv, const char *options,
 	if (options == NULL)
 		return (-1);
 
+	/*
+	 * XXX Some GNU programs (like cvs) set optind to 0 instead of
+	 * XXX using optreset.  Work around this braindamage.
+	 */
+	if (optind == 0)
+		optind = optreset = 1;
+
 	/*
 	 * Disable GNU extensions if POSIXLY_CORRECT is set or options
 	 * string begins with a '+'.
 	 */
-	if (posixly_correct == -1)
+	if (posixly_correct == -1 || optreset)
 		posixly_correct = (getenv("POSIXLY_CORRECT") != NULL);
-	if (posixly_correct || *options == '+')
-		flags &= ~FLAG_PERMUTE;
-	else if (*options == '-')
+	if (*options == '-')
 		flags |= FLAG_ALLARGS;
+	else if (posixly_correct || *options == '+')
+		flags &= ~FLAG_PERMUTE;
 	if (*options == '+' || *options == '-')
 		options++;
 
-	/*
-	 * XXX Some GNU programs (like cvs) set optind to 0 instead of
-	 * XXX using optreset.  Work around this braindamage.
-	 */
-	if (optind == 0)
-		optind = optreset = 1;
-
 	optarg = NULL;
 	if (optreset)
 		nonopt_start = nonopt_end = -1;