From 003aaef883db5f18fd43cfb6cc019383d681221b Mon Sep 17 00:00:00 2001
From: Sujal Patel <smpatel@FreeBSD.org>
Date: Mon, 22 Apr 1996 18:37:22 +0000
Subject: [PATCH] Fix a segfault which occurs when it gets an empty input line.
 Closes PR bin/1153

Reviewed by:	smpatel
Submitted by:	Matthew C. Mead (mmead@Glock.COM)
---
 usr.bin/fmt/fmt.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/usr.bin/fmt/fmt.c b/usr.bin/fmt/fmt.c
index cba6456131bd..4bd1a7f76b27 100644
--- a/usr.bin/fmt/fmt.c
+++ b/usr.bin/fmt/fmt.c
@@ -172,7 +172,6 @@ fmt(fi)
 			*cp++ = c;
 			c = getc(fi);
 		}
-		*cp = '\0';
 
 		/*
 		 * Toss anything remaining on the input line.
@@ -180,6 +179,14 @@ fmt(fi)
 		while (c != '\n' && c != EOF)
 			c = getc(fi);
 
+		if (cp != NULL) {
+			*cp = '\0';
+		} else {
+			putchar('\n');
+			c = getc(fi);
+			continue;
+		}
+
 		/*
 		 * Expand tabs on the way to canonb.
 		 */