# Function to process files
process_file() {
    local file=$1
    echo "Processing file: $file"
    local prefix=$(basename $file .h)
    diff -u <(
        grep -E "eth_|$prefix\_" "$output_file" | tr -d , | awk '{ print $1; }' | sort
    ) <(
        /usr/local/bin/ctags -f- --kinds-C=p $file | awk '{ print $1; }'
    ) | grep '^+' | grep -v '^+++' | sed 's/^+//' >> "$output_file"
}