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From: gwyn@brl-smoke.ARPA (Doug Gwyn )
Newsgroups: net.bugs.usg
Subject: SVR2 (and older) nroff bug
Message-ID: <1068@brl-smoke.ARPA>
Date: Tue, 20-May-86 16:49:21 EDT
Article-I.D.: brl-smok.1068
Posted: Tue May 20 16:49:21 1986
Date-Received: Sun, 25-May-86 11:53:05 EDT
Distribution: net
Organization: Ballistic Research Lab (BRL)
Lines: 32

Dave Yost found a bug in nroff that can cause a core dump on some machines.
In file n1.c, init1() contains a call to mchbits(), which uses device-
specific data that has not yet been set up!  This file is shared by otroff,
which therefore has the same bug.  BWK seems to have fixed it in new troff.

/*
 *	roff.src  -  v 2.9 of 9/9/83
...
 */
...
#ifdef NROFF
char ntversion[] = "@(#)nroff:	n1.c 2.9";
#else
char ntversion[] = "@(#)otroff:	n1.c 2.9";
#endif
...
int version = 29;		/* nroff/troff version tag */
...
init1(a)	/* DAG -- there was a FF at the beginning of this line! */
char a;
{
...
	trtab[UNPAD] = ' ';
/*	mchbits();	/* DAG -- device info not available here; moved to init2() (fixes bug reported by Dave Yost) */
...
}
init2()		/* DAG -- FF here too! */
{
...
	ptinit();
	mchbits();	/* DAG -- moved here from init1() */
...