harvey/rc/bin/pc/isfat

#!/bin/rc

rfork e

# 0000000  eb 3c 90  P  l  a  n  9  .  0  0 00 02 04 02 00
# 0000010  02 00 02 02  P f8 14 00  ? 00 ff 00  ~ 04  } 00
# 0000020  02  P 00 00 80 00  ) a8 04  } 00  C  Y  L  I  N
# 0000030   D  R  I  C  A  L  F  A  T  1  6          fa 8c

if(! ~ $#* 1) {
	echo 'usage: isfat /dev/sdC0/part' >[1=2]
	exit usage
}

arg=$1
fn fat {
	cmp -s <{dd -if $arg -bs 1 -count 3 -skip $1 >[2]/dev/null} <{echo -n FAT}
}

fat 54 || fat 82
exit $status