diff --git a/cfg/posix.cfg b/cfg/posix.cfg
index f4f8720cc..053092eb3 100644
--- a/cfg/posix.cfg
+++ b/cfg/posix.cfg
@@ -4717,6 +4717,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
     <returnValue type="wchar_t *"/>
     <noreturn>false</noreturn>
     <leak-ignore/>
+    <not-overlapping-data ptr1-arg="1" ptr2-arg="2" size-arg="3"/>
     <arg nr="1" direction="out">
       <not-null/>
       <minsize type="argvalue" arg="3"/>
@@ -4737,6 +4738,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
     <returnValue type="char *"/>
     <noreturn>false</noreturn>
     <leak-ignore/>
+    <not-overlapping-data ptr1-arg="1" ptr2-arg="2" size-arg="3"/>
     <arg nr="1" direction="out">
       <not-null/>
       <minsize type="argvalue" arg="3"/>
@@ -4757,6 +4759,7 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
     <leak-ignore/>
     <returnValue type="void *"/>
     <noreturn>false</noreturn>
+    <not-overlapping-data ptr1-arg="1" ptr2-arg="2" size-arg="4"/>
     <arg nr="1" direction="out">
       <not-null/>
       <minsize type="sizeof" arg="2"/>
diff --git a/test/cfg/posix.c b/test/cfg/posix.c
index affa721a1..e9740a6bc 100644
--- a/test/cfg/posix.c
+++ b/test/cfg/posix.c
@@ -26,6 +26,35 @@
 #include <stdarg.h>
 #include <ctype.h>
 #include <stdbool.h>
+#include <wchar.h>
+#include <string.h>
+
+void overlappingWriteFunction_memccpy(unsigned char *src, unsigned char *dest, int c, size_t count)
+{
+    // No warning shall be shown:
+    (void)memccpy(dest, src, c, count);
+    (void)memccpy(dest, src, 42, count);
+    // cppcheck-suppress overlappingWriteFunction
+    (void)memccpy(dest, dest, c, 4);
+    // cppcheck-suppress overlappingWriteFunction
+    (void)memccpy(dest, dest+3, c, 4);
+}
+
+void overlappingWriteFunction_stpncpy(char *src, char *dest, ssize_t n)
+{
+    // No warning shall be shown:
+    (void) stpncpy(dest, src, n);
+    // cppcheck-suppress overlappingWriteFunction
+    (void)stpncpy(src, src+3, 4);
+}
+
+wchar_t* overlappingWriteFunction_wcpncpy(wchar_t *src, wchar_t *dest, ssize_t n)
+{
+    // No warning shall be shown:
+    (void) wcpncpy(dest, src, n);
+    // cppcheck-suppress overlappingWriteFunction
+    return wcpncpy(src, src+3, 4);
+}
 
 void overlappingWriteFunction_swab(char *src, char *dest, ssize_t n)
 {