Bring the handling of defective prologues even closer to groff,

in particular relaxing the distinction between prologue and body
and further improving messages.
* The last .Dd wins and the last .Os wins, even in the body.
* The last .Dt before the first body macro wins.
* Missing title in .Dt defaults to UNTITLED.  Warn about it.
* Missing section in .Dt does not default to 1.  But warn about it.
* Do not warn multiple times about the same mdoc(7) prologue macro.
* Warn about missing .Os.
* Incomplete .TH defaults to empty strings.  Warn about it.

1 files changed, 4 insertions, 3 deletions

diff --git a/mdoc_man.c b/mdoc_man.c
index f5de18b0..8ef6908a 100644
--- a/mdoc_man.c
+++ b/mdoc_man.c
@@ -1,4 +1,4 @@
-/*	$Id: mdoc_man.c,v 1.67 2014/07/30 00:19:16 schwarze Exp $ */
+/*	$Id: mdoc_man.c,v 1.68 2014/08/06 15:09:05 schwarze Exp $ */
 /*
  * Copyright (c) 2011, 2012, 2013, 2014 Ingo Schwarze <schwarze@openbsd.org>
  *
@@ -548,8 +548,9 @@ man_mdoc(void *arg, const struct mdoc *mdoc)
 	n = mdoc_node(mdoc);
 
 	printf(".TH \"%s\" \"%s\" \"%s\" \"%s\" \"%s\"\n",
-	    meta->title, meta->msec, meta->date,
-	    meta->os, meta->vol);
+	    meta->title,
+	    (meta->msec == NULL ? "" : meta->msec),
+	    meta->date, meta->os, meta->vol);
 
 	/* Disable hyphenation and if nroff, disable justification. */
 	printf(".nh\n.if n .ad l");