From fee21ba2726a8489d5a6690edcf632bc72ea4ff4 Mon Sep 17 00:00:00 2001
From: s-hadinger <49731213+s-hadinger@users.noreply.github.com>
Date: Fri, 26 Sep 2025 16:27:02 +0200
Subject: [PATCH] Berry alternative to strnlen (#23952)

---
 lib/libesp32/berry/src/be_byteslib.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lib/libesp32/berry/src/be_byteslib.c b/lib/libesp32/berry/src/be_byteslib.c
index 046505aef..82053443d 100644
--- a/lib/libesp32/berry/src/be_byteslib.c
+++ b/lib/libesp32/berry/src/be_byteslib.c
@@ -806,7 +806,10 @@ static int m_asstring(bvm *vm)
 {
     buf_impl attr = bytes_check_data(vm, 0);
     check_ptr(vm, &attr);
-    size_t safe_len = strnlen((const char*) attr.bufptr, attr.len);
+    /* equivalent to strnlen() */
+    const char* str = (const char*) attr.bufptr;
+    const char* found = memchr(str, '\0', attr.len);
+    size_t safe_len = found ? (size_t)(found - str) : (size_t)attr.len;
     be_pushnstring(vm, (const char*) attr.bufptr, safe_len);
     be_return(vm);
 }