From e24c5c60d724120d137f9e5db4e59cf67fd06ba2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Dag-Erling=20Sm=C3=B8rgrav?= <des@FreeBSD.org>
Date: Fri, 5 Aug 2022 01:50:00 +0200
Subject: [PATCH] renice: support -- as per POSIX.

Sponsored by:	Klara, Inc.
MFC after:	1 week
---
 usr.bin/renice/renice.c | 31 +++++++++++++++++++------------
 1 file changed, 19 insertions(+), 12 deletions(-)

diff --git a/usr.bin/renice/renice.c b/usr.bin/renice/renice.c
index 67917f96e1f8..fd442b425897 100644
--- a/usr.bin/renice/renice.c
+++ b/usr.bin/renice/renice.c
@@ -69,8 +69,9 @@ int
 main(int argc, char *argv[])
 {
 	struct passwd *pwd;
-	int errs, incr, prio, which, who;
+	int delim, errs, incr, prio, which, who;
 
+	delim = 0;
 	errs = 0;
 	incr = 0;
 	which = PRIO_PROCESS;
@@ -88,17 +89,23 @@ main(int argc, char *argv[])
 		return (1);
 	argc--, argv++;
 	for (; argc > 0; argc--, argv++) {
-		if (strcmp(*argv, "-g") == 0) {
-			which = PRIO_PGRP;
-			continue;
-		}
-		if (strcmp(*argv, "-u") == 0) {
-			which = PRIO_USER;
-			continue;
-		}
-		if (strcmp(*argv, "-p") == 0) {
-			which = PRIO_PROCESS;
-			continue;
+		if (!delim) {
+			if (strcmp(*argv, "-g") == 0) {
+				which = PRIO_PGRP;
+				continue;
+			}
+			if (strcmp(*argv, "-u") == 0) {
+				which = PRIO_USER;
+				continue;
+			}
+			if (strcmp(*argv, "-p") == 0) {
+				which = PRIO_PROCESS;
+				continue;
+			}
+			if (strcmp(*argv, "--") == 0) {
+				delim = 1;
+				continue;
+			}
 		}
 		if (which == PRIO_USER) {
 			if ((pwd = getpwnam(*argv)) != NULL)