@code{errno} or using a string similar to out-of-range values),
although POSIX requires this to leave @code{errno} unchanged and
report success, on some platforms:
-FreeBSD 8.2, MacOS X 10.5.
+FreeBSD 8.2, OpenBSD 4.7, MacOS X 10.5.
@item
This function fails to return a string for out-of-range integers on
some platforms: