posix.cfg: Added overlapping data check for stpcpy().

cfg/posix.cfg

@@ -3889,6 +3889,7 @@ 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" strlen-arg="2"/>
     <arg nr="1" direction="out">
       <not-null/>
       <minsize type="strlen" arg="2"/>

test/cfg/posix.c

@@ -29,6 +29,14 @@
 #include <wchar.h>
 #include <string.h>
 
+char * overlappingWriteFunction_stpcpy(char *src, char *dest)
+{
+    // No warning shall be shown:
+    (void) stpcpy(dest, src);
+    // cppcheck-suppress overlappingWriteFunction
+    return stpcpy(src, src);
+}
+
 void overlappingWriteFunction_bcopy(char *buf, const size_t count)
 {
     // No warning shall be shown: