postgresql/src/include/catalog/unused_oids

#!/bin/sh
#
# unused_oids
#
# $PostgreSQL: pgsql/src/include/catalog/unused_oids,v 1.6 2005/04/13 18:54:57 tgl Exp $
#
#	finds blocks of manually-assignable oids that have not already been
#	claimed by post_hackers.  primarily useful for finding available
#	oids for new internal functions.  the numbers printed are inclusive
#	ranges of unused oids.
#
#	before using a large empty block, make sure you aren't about
#	to take over what was intended as expansion space for something
#	else.
#
#	run this script in src/include/catalog.
#


AWK="awk"

# Get FirstBootstrapObjectId from access/transam.h
FIRSTOBJECTID=`grep '#define[ 	]*FirstBootstrapObjectId' ../access/transam.h | $AWK '{ print $3 }'`
export FIRSTOBJECTID

egrep '^DATA' pg_*.h | \
	sed -e 's/^.*OID[^=]*=[^0-9]*//' -e 's/[^0-9].*$//' | \
	sort -n | \
	uniq | \
	$AWK '
BEGIN {
	last = 0;
}
/^[0-9]/ {
	if ($1 > last + 1) {
		if ($1 > last + 2) {
			print last + 1, "-", $1 - 1;
		} else {
			print last + 1;
		}
	}
	last = $1;
}
END {
	print last + 1, "-", ENVIRON["FIRSTOBJECTID"]-1;
}'