From f0cf2bc6b0af6e49bad88f0243717fb13b5ef5cc Mon Sep 17 00:00:00 2001
From: ripsaw8080 <ripsaw8080@users.sourceforge.net>
Date: Tue, 5 Apr 2016 05:40:48 +0000
Subject: [PATCH] Prevent DOS buffered input function from hanging in an
 infinite loop when redirected input reads a linefeed or reaches EOF.

Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@3977
---
 src/dos/dos.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/dos/dos.cpp b/src/dos/dos.cpp
index 28e5663b..a421fe07 100644
--- a/src/dos/dos.cpp
+++ b/src/dos/dos.cpp
@@ -223,6 +223,10 @@ static Bitu DOS_21Handler(void) {
 			free--;
 			for(;;) {
 				DOS_ReadFile(STDIN,&c,&n);
+				if (n == 0)				// End of file
+					E_Exit("DOS:0x0a:Redirected input reached EOF");
+				if (c == 10)			// Line feed
+					continue;
 				if (c == 8) {			// Backspace
 					if (read) {	//Something to backspace.
 						// STDOUT treats backspace as non-destructive.