It seems to me that when using the pg_amcheck --startblock and
--endblock options on platforms where sizeof(long) == 4, you cannot
specify higher block numbers (unless you do tricks with negative
numbers). The attached patch should fix this by using strtoul() instead
of strtol(). I also tightened up the number scanning a bit in other
ways, similar to the code in other frontend utilities. I know some
people have been working on tightening all this up. Please check that
it's up to speed.
