even if a table has zero columns, do not segfault in the formatter;

bug reported by bentley@

2 files changed, 4 insertions, 4 deletions

diff --git a/out.c b/out.c
index 93cc9658..5b08a09a 100644
--- a/out.c
+++ b/out.c
@@ -1,4 +1,4 @@
-/*	$Id: out.c,v 1.52 2014/10/14 02:16:06 schwarze Exp $ */
+/*	$Id: out.c,v 1.53 2014/10/14 18:18:05 schwarze Exp $ */
 /*
  * Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2011, 2014 Ingo Schwarze <schwarze@openbsd.org>
@@ -158,7 +158,7 @@ tblcalc(struct rofftbl *tbl, const struct tbl_span *sp,
 	tbl->cols = mandoc_calloc((size_t)sp->opts->cols,
 	    sizeof(struct roffcol));
 
-	for (maxcol = 0; sp; sp = sp->next) {
+	for (maxcol = -1; sp; sp = sp->next) {
 		if (TBL_SPAN_DATA != sp->pos)
 			continue;
 		spans = 1;
diff --git a/tbl_term.c b/tbl_term.c
index 6a733506..0275b1a2 100644
--- a/tbl_term.c
+++ b/tbl_term.c
@@ -1,4 +1,4 @@
-/*	$Id: tbl_term.c,v 1.30 2014/10/14 02:16:06 schwarze Exp $ */
+/*	$Id: tbl_term.c,v 1.31 2014/10/14 18:18:05 schwarze Exp $ */
 /*
  * Copyright (c) 2009, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2011, 2012, 2014 Ingo Schwarze <schwarze@openbsd.org>
@@ -107,7 +107,7 @@ term_tbl(struct termp *tp, const struct tbl_span *sp)
 	/* Vertical frame at the start of each row. */
 
 	if ((TBL_OPT_BOX | TBL_OPT_DBOX) & sp->opts->opts ||
-	    sp->head->vert)
+	    (sp->head != NULL && sp->head->vert))
 		term_word(tp, TBL_SPAN_HORIZ == sp->pos ||
 		    TBL_SPAN_DHORIZ == sp->pos ? "+" : "|");