From 3f0b80bc1537c257f3bd68592832ec8cb65e1c58 Mon Sep 17 00:00:00 2001
From: Jamie Landeg-Jones <jamie@catflap.org>
Date: Tue, 23 Apr 2024 18:44:36 +0200
Subject: [PATCH] ps: handle incorrect -D values

I just noticed a slight issue with the '-D' option. Basically,
I accidentally typed something along the lines of:

ps -Dboth-p303

I.E. missing out the "space". Instead of giving an error, it behaved as
if I'd just typed "ps".

Looking at bin/ps/ps.c, where the -D option is parsed, it doesn't
error-out if there is no valid match.

This commit fixes the bug.
---
 bin/ps/ps.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/bin/ps/ps.c b/bin/ps/ps.c
index cbee10c20d53..53ace6247b33 100644
--- a/bin/ps/ps.c
+++ b/bin/ps/ps.c
@@ -263,6 +263,8 @@ main(int argc, char *argv[])
 				else if (len <= 4 &&
 					strncasecmp(optarg, "both", len) == 0)
 					directions |= BOTH;
+				else
+					usage();
 				break;
 			}
 		case 'd':