From e90a3053d47243af49e6d06a51e2c69e24c5b286 Mon Sep 17 00:00:00 2001
From: orbitcowboy <orbitcowboy@web.de>
Date: Fri, 16 Jul 2021 14:01:40 +0200
Subject: [PATCH] std.cfg: Added a overlappingWriteFunction-check to strncat

---
 cfg/std.cfg      |  1 +
 test/cfg/std.cpp | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/cfg/std.cfg b/cfg/std.cfg
index 0c9500257..7de265506 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -4916,6 +4916,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
     <returnValue type="char *"/>
     <noreturn>false</noreturn>
     <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 1d10031a7..26d56f6c9 100644
--- a/test/cfg/std.cpp
+++ b/test/cfg/std.cpp
@@ -93,6 +93,20 @@ char * overlappingWriteFunction_strcat(char *src, char *dest)
     return strcat(src, src);
 }
 
+char * overlappingWriteFunction_strncat(char *src, char *dest, const std::size_t count)
+{
+    // No warning shall be shown:
+    (void)strncat(dest, src, 42);
+    (void)strncat(dest, src, count);
+    // cppcheck-suppress overlappingWriteFunction
+    (void)strncat(dest, dest+1, 2);
+    char buffer[] = "strncat";
+    // cppcheck-suppress overlappingWriteFunction
+    (void)strncat(buffer, buffer + 1, 3);
+    // TODO-cppcheck-suppress overlappingWriteFunction
+    return strncat(src, src, count);
+}
+
 wchar_t * overlappingWriteFunction_wcscpy(wchar_t *src, wchar_t *dest)
 {
     // No warning shall be shown: