SVR2 (and older) nroff bug

[Doug Gwyn]

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() */
...