From mboxrd@z Thu Jan  1 00:00:00 1970
From: erik quanstrom <quanstro@quanstro.net>
Date: Fri,  4 Jan 2013 11:05:58 -0500
To: 9fans@9fans.net
Message-ID: <d46ed0ec8d2df81516f1c734e3cbbad4@brasstown.quanstro.net>
MIME-Version: 1.0
Content-Type: text/plain; charset="US-ASCII"
Content-Transfer-Encoding: 7bit
Subject: [9fans] tbl fail
Topicbox-Message-UUID: fd723926-ead7-11e9-9d60-3106f5b1d025

tbl's calculation for how many columns it can handle is
wrong.  sizeof(nregs) = nelem(nregs)*sizeof(char*).
it appears that tbl is assuming *2-byte pointers*!

huzzah!

- erik

/n/dump/2013/0104/sys/src/cmd/tbl/tr.c:20,26 - tr.c:20,26
  char	*
  reg(int col, int place)
  {
- 	if (sizeof(nregs) < 2 * 3 * qcol)
+ 	if(qcol*place+col >= nelem(nregs)-1)
  		error("Too many columns for registers");
  	return (nregs[qcol*place+col]);
  }