#!/bin/sh
# DF-1048 run: executes the arithmetic harness (proves the divide-by-zero
# primitive and that the fix eliminates it). On a host with a real MCS7840
# USB-serial adapter attached, also runs the live trigger on /dev/cuaU0.
set -e
cd "$(dirname "$0")"

echo "============================================================"
echo " DF-1048: umcs7840_calc_baudrate divide-by-zero (CWE-369)"
echo " arithmetic harness (mirrors umcs.c:1056-1070 verbatim)"
echo "============================================================"
echo
echo "[running harness at -O0]"
./harness_O0
echo "RUN_EXIT_O0=$?"
echo
echo "[running harness at -O2]"
./harness_O2
echo "RUN_EXIT_O2=$?"

# Live trigger — only if a real MCS7840 device node exists (it does NOT on
# this VM, which has no USB host controller). Optional, non-fatal.
if [ -c /dev/cuaU0 ]; then
    echo
    echo "[live trigger: /dev/cuaU0 exists — running tcsetattr(B0) PoC]"
    echo "[expect kernel panic 'Fatal trap 17: divide-by-zero' on unpatched kernel]"
    ./trigger /dev/cuaU0 || true
else
    echo
    echo "[live trigger SKIPPED: no /dev/cuaU0 (no USB host controller / MCS7840 in this VM)]"
    echo "[the arithmetic harness above is the reproducible proof for this environment]"
fi