From 43248244b8753f9ee2162e7e8ce3f407c2149d6f Mon Sep 17 00:00:00 2001
From: Vladimir Gavrilov <105977161+0xA50C1A1@users.noreply.github.com>
Date: Mon, 12 May 2025 10:46:54 +0300
Subject: Micro-optimizations of 'ndpi_strncasestr' and 'LINE_*' macros (#2808)

---
 src/lib/ndpi_main.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'src/lib/ndpi_main.c')

diff --git a/src/lib/ndpi_main.c b/src/lib/ndpi_main.c
index 0146f5b18..0cc57e19b 100644
--- a/src/lib/ndpi_main.c
+++ b/src/lib/ndpi_main.c
@@ -10533,10 +10533,18 @@ const char * ndpi_strncasestr(const char *s, const char *find, size_t len) {
 
   const size_t s_len = strnlen(s, len);
 
+  /* If 'find' is longer than 's', no match is possible */
+  if (find_len > s_len) {
+    return NULL;
+  }
+
   const char *const end_of_search = s + s_len - find_len + 1;
 
+  /* Cache the lowercased first character of 'find' */
+  const unsigned char fc = tolower((unsigned char) *find);
+
   for (; s < end_of_search; ++s) {
-    if (tolower((unsigned char)*s) == tolower((unsigned char)*find)) {
+    if (tolower((unsigned char)*s) == fc) {
       if (strncasecmp(s + 1, find + 1, find_len - 1) == 0) {
         return s;
       }
-- 
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