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#!/bin/bash
#prime the "old" states. it seems that stepgen likes to start with phase-A=1
read oa ob c < $1
count=0
# if a leads b, then the count goes up. if b leads a, the count goes down
# if a and b stay the same, the count stays the same
# if a and b both change, it's an error
while read a b c; do
case "$oa$a$ob$b" in
0000) ;;
0001) count=$((count-1));;
0010) count=$((count+1));;
0011) ;;
0100) count=$((count+1));;
0101) exit 1;;
0110) exit 1;;
0111) count=$((count-1));;
1000) count=$((count-1));;
1001) exit 1;;
1010) exit 1;;
1011) count=$((count+1));;
1100) ;;
1101) count=$((count+1));;
1110) count=$((count-1));;
1111) ;;
*) echo "$oa$a$ob$b"; exit 1
esac
oa=$a; ob=$b
# if our count doesn't match the stepgen count, it's an error
if [ $c -ne $count ]; then exit 1; fi
done < $1
# if the end position isn't 1280, it's an error
if [ $count -ne 1280 ]; then exit 1; fi
exit 0
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