From 01c98acc9b4c00302167d987e61d873d0abe9b30 Mon Sep 17 00:00:00 2001
From: millert <millert@openbsd.org>
Date: Wed, 28 Aug 2024 14:30:26 +0000
Subject: [PATCH] Fix the case where the pattern space is empty but does not
 start with a NUL character, which might occur after using the D command. From
 Mohamed Akram

---
 usr.bin/sed/process.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/usr.bin/sed/process.c b/usr.bin/sed/process.c
index c2d78940302..7635f2ffd14 100644
--- a/usr.bin/sed/process.c
+++ b/usr.bin/sed/process.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: process.c,v 1.37 2024/07/17 20:57:16 millert Exp $	*/
+/*	$OpenBSD: process.c,v 1.38 2024/08/28 14:30:26 millert Exp $	*/
 
 /*-
  * Copyright (c) 1992 Diomidis Spinellis.
@@ -387,14 +387,12 @@ substitute(struct s_command *cp)
 		 * and at the end of the line, terminate.
 		 */
 		if (match[0].rm_so == match[0].rm_eo) {
-			if (*s == '\0' || *s == '\n')
-				slen = -1;
-			else
-				slen--;
-			if (*s != '\0') {
+			if (slen > 0) {
 				cspace(&SS, s++, 1, APPEND);
+				slen--;
 				le++;
-			}
+			} else
+				slen = -1;
 			lastempty = 1;
 		} else
 			lastempty = 0;
-- 
2.20.1