---- * Core helper: run one test case via run_case(). * label -- unique test name suffix (prefixed with "1211_") * src -- input string (copied into g_src) * * In reference mode: calls the DOS, records destination buffer to .ref. * In test mode: calls the DOS, compares destination buffer to .ref. * * Also checks the sentinel byte after g_dst[len] is unchanged (no overru
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