add check for line endings containing CR.

.github/checks/Makefile

@@ -1,7 +1,10 @@
 
-.PHONY: checkstyle tabs lastline spaces noexec
+.PHONY: checkstyle lineendings tabs lastline spaces noexec
 
-checkstyle: tabs lastline spaces noexec
+checkstyle: lineendings tabs lastline spaces noexec
+
+lineendings: lineendings.sh
+	@./lineendings.sh
 
 tabs: tabs.sh
 	@./tabs.sh

.github/checks/lineendings.sh

@@ -0,0 +1,18 @@
+#! /bin/bash
+OLDCWD=`pwd`
+SCRIPT_PATH=`dirname $0`
+CHECK_PATH=.
+
+cd $SCRIPT_PATH/../../
+
+FILES=`find $CHECK_PATH -type f \( -name \*.inc -o -name Makefile -o -name \*.cfg -o -name \*.\[chs\] -o -name \*.mac -o -name \*.asm -o -name \*.sgml \) -print | grep -v "libwrk/" | grep -v "testwrk/" | xargs grep -IUl $'\r'`
+
+cd $OLDCWD
+
+if [ x"$FILES"x != xx ]; then
+    echo "error: found CR in the following files:" >&2
+    for n in $FILES; do
+        echo $n >&2
+    done
+    exit -1
+fi

Contributing.md

@@ -14,6 +14,10 @@ This document contains all kinds of information that you should know if you want
 
 ## All Sources
 
+### Line endings
+
+All files must only contain Unix style 'LF' line endings. Please configure your editors accordingly.
+
 ### TABs and spaces
 
 This is an ongoing controversial topic - everyone knows that. However, the following is how we do it :)