This function may set the source pointer to NULL before NUL terminating the destination string on some platforms:
OSF/1 5.1.
@item
+This function does not ignore the length argument if the destination argument is NULL on some platforms:
+mingw.
+@item
This function updates the source pointer also if the destination argument is NULL on some platforms:
HP-UX 11, OSF/1 5.1.
@end itemize