===================================================================
RCS file: /cvs/mandoc/mansearch.c,v
retrieving revision 1.70
retrieving revision 1.74
diff -u -p -r1.70 -r1.74
--- mandoc/mansearch.c	2017/04/17 20:05:08	1.70
+++ mandoc/mansearch.c	2017/07/01 09:47:30	1.74
@@ -1,4 +1,4 @@
-/*	$OpenBSD: mansearch.c,v 1.70 2017/04/17 20:05:08 schwarze Exp $ */
+/*	$OpenBSD: mansearch.c,v 1.74 2017/07/01 09:47:30 schwarze Exp $ */
 /*
  * Copyright (c) 2012 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2013-2017 Ingo Schwarze <schwarze@openbsd.org>
@@ -104,7 +104,8 @@ mansearch(const struct mansearch *search,
 	}
 
 	cur = maxres = 0;
-	*res = NULL;
+	if (res != NULL)
+		*res = NULL;
 
 	outkey = KEY_Nd;
 	if (search->outkey != NULL)
@@ -155,7 +156,8 @@ mansearch(const struct mansearch *search,
 		chdir_status = 1;
 
 		if (dbm_open(MANDOC_DB) == -1) {
-			warn("%s/%s", paths->paths[i], MANDOC_DB);
+			if (errno != ENOENT)
+				warn("%s/%s", paths->paths[i], MANDOC_DB);
 			continue;
 		}
 
@@ -172,6 +174,10 @@ mansearch(const struct mansearch *search,
 			    lstmatch(search->arch, page->arch) == 0)
 				continue;
 
+			if (res == NULL) {
+				cur = 1;
+				break;
+			}
 			if (cur + 1 > maxres) {
 				maxres += 1024;
 				*res = mandoc_reallocarray(*res,
@@ -203,12 +209,13 @@ mansearch(const struct mansearch *search,
 		if (cur && search->firstmatch)
 			break;
 	}
-	qsort(*res, cur, sizeof(struct manpage), manpage_compare);
+	if (res != NULL)
+		qsort(*res, cur, sizeof(struct manpage), manpage_compare);
 	if (chdir_status && getcwd_status && chdir(buf) == -1)
 		warn("%s", buf);
 	exprfree(e);
 	*sz = cur;
-	return 1;
+	return res != NULL || cur;
 }
 
 /*
@@ -516,6 +523,8 @@ buildoutput(size_t im, struct dbm_page *page)
 		output = mandoc_malloc(sz);
 		i = 0;
 		lstcat(output, &i, input, " # ");
+		output[i++] = '\0';
+		assert(i == sz);
 		return output;
 	}
 
@@ -670,6 +679,12 @@ exprterm(const struct mansearch *search, int argc, cha
 		return e;
 	}
 
+	if (strcmp("-i", argv[*argi]) == 0 && *argi + 1 < argc) {
+		cs = 0;
+		++*argi;
+	} else
+		cs = 1;
+
 	e = mandoc_calloc(1, sizeof(*e));
 	e->type = EXPR_TERM;
 	e->bits = 0;
@@ -688,7 +703,6 @@ exprterm(const struct mansearch *search, int argc, cha
 	 * If needed, request regular expression handling.
 	 */
 
-	cs = 1;
 	if (search->argmode == ARG_WORD) {
 		e->bits = TYPE_Nm;
 		e->match.type = DBM_REGEX;