add can driver

hc

2023-12-02 57e32c52610e6a560beda60bf33c48f9f42306d5

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#!/bin/sh
 
cd tests
for i in test*[0-9] ; do
    if ./${i} | cmp -s "${i}.ans" - ; then
        echo "PASS: ${i}"
    else
        echo "FAIL: ${i}"
    fi
done