PIC bug

[Doug Gwyn <gwyn>]

For anyone who is using the OLDTROFF flavor of PIC (the one that
drives pre-Device Independent TROFF), one of the fellows here
uncovered a bug.  In some cases, the DDAed dots output to simulate
one of the graphic primitives (e.g., a line) will produce output
text lines that are too long for other software such as "tbl".
There is a test for this in the code but it is wrong.

Around line 518 in source file "pltroff.c", change

	if (nput++ > 100) {	/* crude approx: troff input buffer ~ 400 */

to

	/* DAG -- bug fix (100 is too much since h,v motions are interspersed) */
	if (nput++ > 40) {	/* crude approx: troff input buffer ~ 400 */