From 3506586e95447d704f34e3182783b2e0b5d3ca98 Mon Sep 17 00:00:00 2001
From: Andrey Volk <andywolk@gmail.com>
Date: Mon, 4 May 2026 11:37:02 -0600
Subject: [PATCH] [Unit-tests] Fix test framework error on newer compiler:
 'strncpy' output truncated before terminating nul copying as many bytes from
 a string as its length [-Werror=stringop-truncation]

---
 src/include/test/switch_fct.h | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/include/test/switch_fct.h b/src/include/test/switch_fct.h
index b28feabb742..91d87bbb9ca 100644
--- a/src/include/test/switch_fct.h
+++ b/src/include/test/switch_fct.h
@@ -254,10 +254,18 @@ fctstr_safe_cpy(char *dst, char const *src, size_t num)
     FCT_ASSERT( num > 0 );
 #if defined(WIN32) && _MSC_VER >= 1400
     strncpy_s(dst, num, src, _TRUNCATE);
+    dst[num - 1] = '\0';
 #else
-    strncpy(dst, src, num - 1);
+    {
+        size_t i;
+
+        for (i = 0; (i < num - 1) && src[i] != '\0'; ++i) {
+            dst[i] = src[i];
+        }
+
+        dst[i] = '\0';
+    }
 #endif
-    dst[num-1] = '\0';
 }
 
 /* Isolate the vsnprintf implementation */