busybox grep only supports the short option -a

--- a/src/logcheck
+++ b/src/logcheck
@@ -242,7 +242,7 @@ cleanrules() {
 						if [ -f "${dir}/${rulefile}" ]; then
 								debug "cleanrules: ${dir}/${rulefile} -> $cleaned/$rulefile"
 								# pipe outut of 'grep' to 'cat' because we want a exit status of 0 even if grep did not find matches
-								command grep -E --text -v '^[[:space:]]*$|^#' "$dir/$rulefile" \
+								command grep -E -a -v '^[[:space:]]*$|^#' "$dir/$rulefile" \
 										| cat >> "$cleaned/$rulefile" \
 										|| error "Could not append to $cleaned/$rulefile"
 						fi
@@ -361,7 +361,7 @@ greplogoutput() {
 				debug "greplogoutput: Using $grepfile to find entries to report" "$grepfile"
 
 				# Report entries that match
-				command grep -E --text -f "$grepfile" "$TMPDIR/logoutput-sorted" \
+				command grep -E -a -f "$grepfile" "$TMPDIR/logoutput-sorted" \
 						| cat > "$TMPDIR/checked" \
 						|| error "Could not output to $TMPDIR/checked"
 
@@ -456,7 +456,7 @@ cleanchecked() {
 
 		if [ -f "$clean" ]; then
 				debug "cleanchecked - filtering using file: $clean" "$clean"
-				command grep -E --text -v -f "$clean" "$TMPDIR/checked" \
+				command grep -E -a -v -f "$clean" "$TMPDIR/checked" \
 						| cat >> "$TMPDIR/checked.1"  \
 						|| error "Could not output to $TMPDIR/checked.1"
 				debug "cleanchecked - after using $clean remaining lines are as follows:" "$TMPDIR/checked.1"
@@ -757,7 +757,7 @@ if [ -z "${LOGFILE-}" ] && [ "${#LOGFILES[@]}" != "0" ]; then
 		for file_list in "${LOGFILES[@]}" ; do
 				if [ -f  "$file_list" ] && [ -r "$file_list" ]; then
 						SAVEIFS=$IFS; IFS=$(echo -en "\n\b");
-            for file in $(command grep -E --text -v -h "(^#|^[[:space:]]*$)" "$file_list"); do
+            for file in $(command grep -E -a -v -h "(^#|^[[:space:]]*$)" "$file_list"); do
 								logoutput "$file"
 						done
 						IFS=$SAVEIFS