From 99de3aa8f6c69f02b989060a0aa3ce3559333dd1 Mon Sep 17 00:00:00 2001
From: Kristaps Dzonsons <kristaps@bsd.lv>
Date: Tue, 24 May 2011 14:00:39 +0000
Subject: [PATCH] Fix a TODO to the effect that `.if n \{\ foo .br \}' was
 failing due to the `\}' not being directly after the `.br'.  Now we check for
 `\}' in arbitrary parts of the line, and account for if it's escaped in funny
 ways.

This behaviour diverges somewhat from groff in that the text at and
following the `\}' is lost, while groff keeps it (sort-of).  I'll add a
COMPATIBILITY note to this effect.
---
 TODO   |  8 +-------
 roff.c | 34 ++++++++++++++++++++++++----------
 2 files changed, 25 insertions(+), 17 deletions(-)

diff --git a/TODO b/TODO
index 91770fd5..06b9ad21 100644
--- a/TODO
+++ b/TODO
@@ -1,6 +1,6 @@
 ************************************************************************
 * Official mandoc TODO.
-* $Id: TODO,v 1.107 2011/05/21 21:38:17 schwarze Exp $
+* $Id: TODO,v 1.108 2011/05/24 14:00:39 kristaps Exp $
 ************************************************************************
 
 ************************************************************************
@@ -10,12 +10,6 @@
 - .TP before .SH is still FATAL in man(7)
   reported by brad@  Sat, 15 Jan 2011 15:54:54 -0500
 
-- the roff parser doesn't tolerate additional characters between
-  a macro and the \} terminating a conditional block, e.g.
-  .if n \{
-  .br \}
-  reported by ulrich spoerlein  Tue, 19 Oct 2010 20:39:50 +0200
-
 ************************************************************************
 * formatter bugs
 ************************************************************************
diff --git a/roff.c b/roff.c
index e36138c8..35e0f883 100644
--- a/roff.c
+++ b/roff.c
@@ -1,4 +1,4 @@
-/*	$Id: roff.c,v 1.138 2011/05/14 16:06:08 kristaps Exp $ */
+/*	$Id: roff.c,v 1.139 2011/05/24 14:00:39 kristaps Exp $ */
 /*
  * Copyright (c) 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2010, 2011 Ingo Schwarze <schwarze@openbsd.org>
@@ -840,21 +840,34 @@ roff_cond_sub(ROFF_ARGS)
 {
 	enum rofft	 t;
 	enum roffrule	 rr;
+	char		*ep;
 
 	rr = r->last->rule;
+	roffnode_cleanscope(r);
 
-	/* 
-	 * Clean out scope.  If we've closed ourselves, then don't
-	 * continue. 
+	/*
+	 * If the macro is unknown, first check if it contains a closing
+	 * delimiter `\}'.  If it does, close out our scope and return
+	 * the currently-scoped rule (ignore or continue).  Else, drop
+	 * into the currently-scoped rule.
 	 */
 
-	roffnode_cleanscope(r);
-
 	if (ROFF_MAX == (t = roff_parse(r, *bufp, &pos))) {
-		if ('\\' == (*bufp)[pos] && '}' == (*bufp)[pos + 1])
-			return(roff_ccond
-				(r, ROFF_ccond, bufp, szp,
-				 ln, pos, pos + 2, offs));
+		/*
+		 * Jump through hoops to detect a \}, because it could
+		 * be (say) \\}, which is something completely
+		 * different.
+		 */
+		ep = &(*bufp)[pos];
+		for ( ; NULL != (ep = strchr(ep, '\\')); ep++) {
+			ep++;
+			if ('}' != *ep)
+				continue;
+			*--ep = '\0';
+			roff_ccond(r, ROFF_ccond, bufp, szp, 
+					ln, pos, pos + 2, offs);
+			break;
+		}
 		return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
 	}
 
@@ -863,6 +876,7 @@ roff_cond_sub(ROFF_ARGS)
 	 * if they're either structurally required (such as loops and
 	 * conditionals) or a closing macro.
 	 */
+
 	if (ROFFRULE_DENY == rr)
 		if ( ! (ROFFMAC_STRUCT & roffs[t].flags))
 			if (ROFF_ccond != t)
-- 
2.47.1