correct width of horizontal spans

[Ingo Schwarze <schwarze@usta.de>]

Now that the 150 lines i just deleted
are out of the way, this is quite easy.

You want this, too?

----- Forwarded message from Ingo Schwarze <schwarze@cvs.openbsd.org> -----

From: Ingo Schwarze <schwarze@cvs.openbsd.org>
Date: Sat, 26 May 2012 14:53:17 -0600 (MDT)
To: source-changes@cvs.openbsd.org

CVSROOT:	/cvs
Module name:	src
Changes by:	schwarze@cvs.openbsd.org	2012/05/26 14:53:17

Modified files:
	usr.bin/mandoc : tbl_term.c 

Log message:
Correct width of horizontal spans; relevant in case of centered or
flush right text, for boxes, and when more columns follow the span.

Issue found by sthen@ in the net/arp-scan(1) port manual.

----- End forwarded message -----

Index: tbl_term.c
===================================================================
RCS file: /cvs/src/usr.bin/mandoc/tbl_term.c,v
retrieving revision 1.11
diff -u -p -r1.11 tbl_term.c
--- tbl_term.c	26 May 2012 20:03:34 -0000	1.11
+++ tbl_term.c	26 May 2012 20:47:48 -0000
@@ -1,7 +1,7 @@
 /*	$Id: tbl_term.c,v 1.11 2012/05/26 20:03:34 schwarze Exp $ */
 /*
  * Copyright (c) 2009, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
- * Copyright (c) 2011 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2011, 2012 Ingo Schwarze <schwarze@openbsd.org>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -333,11 +333,19 @@ static void
 tbl_literal(struct termp *tp, const struct tbl_dat *dp, 
 		const struct roffcol *col)
 {
-	size_t		 len, padl, padr;
+	struct tbl_head		*hp;
+	size_t			 width, len, padl, padr;
+	int			 spans;
 
 	assert(dp->string);
 	len = term_strlen(tp, dp->string);
-	padr = col->width > len ? col->width - len : 0;
+
+	hp = dp->layout->head->next;
+	width = col->width;
+	for (spans = dp->spans; spans--; hp = hp->next)
+		width += tp->tbl.cols[hp->ident].width + 3;
+
+	padr = width > len ? width - len : 0;
 	padl = 0;
 
 	switch (dp->layout->pos) {
--
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