From d7b6d89d903758f60a9ead5349257f59b3184955 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@amutable.com>
Date: Wed, 15 Apr 2026 16:06:04 +0200
Subject: [PATCH] string-util: add minor optimization to strrstr()

---
 src/basic/string-util.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/basic/string-util.c b/src/basic/string-util.c
index c3298bc8ee..6168855a75 100644
--- a/src/basic/string-util.c
+++ b/src/basic/string-util.c
@@ -1519,13 +1519,17 @@ char* strrstr_internal(const char *haystack, const char *needle) {
 
         /* Special case: for the empty string we return the very last possible occurrence, i.e. *after* the
          * last char, not before. */
-        if (*needle == 0)
+        if (needle[0] == 0)
                 return (char*) strchr(haystack, 0);
 
+        /* Special case: for single character strings, just use optimized strrchr() */
+        if (needle[1] == 0)
+                return (char*) strrchr(haystack, needle[0]);
+
         for (const char *p = strstr(haystack, needle), *q; p; p = q) {
                 q = strstr(p + 1, needle);
                 if (!q)
-                        return (char *) p;
+                        return (char*) p;
         }
         return NULL;
 }