When finding a bogus database entry,

print a meaningful warning and skip the entry.
Issue reported by espie@.

1 files changed, 11 insertions, 1 deletions

diff --git a/usr.bin/mandoc/mansearch.c b/usr.bin/mandoc/mansearch.c
index 7a8d9632ce7..8d599877b3d 100644
--- a/usr.bin/mandoc/mansearch.c
+++ b/usr.bin/mandoc/mansearch.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: mansearch.c,v 1.59 2017/08/02 13:28:35 schwarze Exp $ */
+/*	$OpenBSD: mansearch.c,v 1.60 2017/08/22 17:50:02 schwarze Exp $ */
 /*
  * Copyright (c) 2012 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2013-2017 Ingo Schwarze <schwarze@openbsd.org>
@@ -185,6 +185,16 @@ mansearch(const struct mansearch *search,
 			mpage = *res + cur;
 			mandoc_asprintf(&mpage->file, "%s/%s",
 			    paths->paths[i], page->file + 1);
+			if (access(chdir_status ? page->file + 1 :
+			    mpage->file, R_OK) == -1) {
+				warn("%s", mpage->file);
+				warnx("outdated mandoc.db contains "
+				    "bogus %s entry, run makewhatis %s", 
+				    page->file + 1, paths->paths[i]);
+				free(mpage->file);
+				free(rp);
+				continue;
+			}
 			mpage->names = buildnames(page);
 			mpage->output = buildoutput(outkey, page);
 			mpage->ipath = i;