When the HEAD scope of .TP is broken by another block macro,

do not abort with a FATAL error, but report a report a WARNING,
remove the broken .TP from the syntax tree, and prod on.
Reported repeatedly by ports people, at least by brad@ and jeremy@.
Also fixes rendition(4) in Xenocara.
ok kristaps@

1 files changed, 28 insertions, 1 deletions

diff --git a/man.c b/man.c
index 70ec1e64..f7c70d75 100644
--- a/man.c
+++ b/man.c
@@ -543,13 +543,40 @@ man_pmacro(struct man *m, int ln, char *buf, int offs)
 			n = n->parent;
 
 		mandoc_vmsg(MANDOCERR_LINESCOPE, m->parse, n->line, 
-				n->pos, "%s", man_macronames[n->tok]);
+		    n->pos, "%s breaks %s", man_macronames[tok],
+		    man_macronames[n->tok]);
 
 		man_node_delete(m, n);
 		m->flags &= ~MAN_ELINE;
 	}
 
 	/*
+	 * Remove prior BLINE macro that is being clobbered.
+	 */
+	if ((m->flags & MAN_BLINE) &&
+	    (MAN_BSCOPE & man_macros[tok].flags)) {
+		n = m->last;
+		assert(MAN_TEXT != n->type);
+
+		/* Remove element that didn't end BLINE, if any. */
+
+		if ( ! (MAN_BSCOPE & man_macros[n->tok].flags))
+			n = n->parent;
+
+		assert(MAN_HEAD == n->type);
+		n = n->parent;
+		assert(MAN_BLOCK == n->type);
+		assert(MAN_SCOPED & man_macros[n->tok].flags);
+
+		mandoc_vmsg(MANDOCERR_LINESCOPE, m->parse, n->line, 
+		    n->pos, "%s breaks %s", man_macronames[tok],
+		    man_macronames[n->tok]);
+
+		man_node_delete(m, n);
+		m->flags &= ~MAN_BLINE;
+	}
+
+	/*
 	 * Save the fact that we're in the next-line for a block.  In
 	 * this way, embedded roff instructions can "remember" state
 	 * when they exit.