From 8096fa4db195998168cf9bb20eeea05ae256fb7d Mon Sep 17 00:00:00 2001
From: orbitcowboy <orbitcowboy@web.de>
Date: Fri, 16 Jul 2021 14:30:49 +0200
Subject: [PATCH] std.cfg: Added overlappingWriteFunction-check to wcsncat().

---
 cfg/std.cfg      |  1 +
 test/cfg/std.cpp | 13 +++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/cfg/std.cfg b/cfg/std.cfg
index 7de265506..8d6769cf7 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -4982,6 +4982,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
     <noreturn>false</noreturn>
     <returnValue type="wchar_t *"/>
     <leak-ignore/>
+    <not-overlapping-data ptr1-arg="1" ptr2-arg="2" size-arg="3"/>
     <arg nr="1" direction="inout">
       <not-null/>
       <not-uninit/>
diff --git a/test/cfg/std.cpp b/test/cfg/std.cpp
index c252ddaa0..163c6957c 100644
--- a/test/cfg/std.cpp
+++ b/test/cfg/std.cpp
@@ -106,6 +106,19 @@ char * overlappingWriteFunction_strncat(char *src, char *dest, const std::size_t
     return strncat(buffer, buffer + 1, 3);
 }
 
+wchar_t * overlappingWriteFunction_wcsncat(wchar_t *src, wchar_t *dest, const std::size_t count)
+{
+    // No warning shall be shown:
+    (void)wcsncat(dest, src, 42);
+    (void)wcsncat(dest, src, count);
+    (void)wcsncat(dest, dest, count);
+    // cppcheck-suppress overlappingWriteFunction
+    (void)wcsncat(dest, dest+1, 2);
+    wchar_t buffer[] = L"strncat";
+    // cppcheck-suppress overlappingWriteFunction
+    return wcsncat(buffer, buffer + 1, 3);
+}
+
 wchar_t * overlappingWriteFunction_wcscpy(wchar_t *src, wchar_t *dest)
 {
     // No warning shall be shown: