From de552ba66e2851cbe57f32f7c47a38460290a6d5 Mon Sep 17 00:00:00 2001
From: Dmitry Volyntsev <xeioex@nginx.com>
Date: Fri, 17 May 2024 21:54:49 -0700
Subject: [PATCH] Optimized string creation with ASCII input.

---
 src/njs_string.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/njs_string.c b/src/njs_string.c
index e7e3893c..2549491a 100644
--- a/src/njs_string.c
+++ b/src/njs_string.c
@@ -130,8 +130,20 @@ njs_int_t
 njs_string_create(njs_vm_t *vm, njs_value_t *value, const char *src,
     size_t size)
 {
+    u_char     *p, *p_end;
     njs_str_t  str;
 
+    p = (u_char *) src;
+    p_end = p + size;
+
+    while (p < p_end && *p < 0x80) {
+          p++;
+    }
+
+    if (p == p_end) {
+        return njs_string_new(vm, value, (u_char *) src, size, size);
+    }
+
     str.start = (u_char *) src;
     str.length = size;
 
-- 
2.47.3