From 8812f8fc653e8774098b726635d051477e416569 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Mon, 29 Aug 2022 11:07:43 +0200
Subject: [PATCH] hashmap: add comment explaining that set_fnmatch() handles
 fnmatch() errors as non-matches

---
 src/basic/hashmap.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/basic/hashmap.c b/src/basic/hashmap.c
index ddd329c8743..8013ac6b8ef 100644
--- a/src/basic/hashmap.c
+++ b/src/basic/hashmap.c
@@ -2079,6 +2079,8 @@ static bool set_fnmatch_one(Set *patterns, const char *needle) {
 
         assert(needle);
 
+        /* Any failure of fnmatch() is treated as equivalent to FNM_NOMATCH, i.e. as non-matching pattern */
+
         SET_FOREACH(p, patterns)
                 if (fnmatch(p, needle, 0) == 0)
                         return true;
-- 
2.47.3