Move *cpy/move functions more towards C11/Windows

[rurban]

Move *cpy/move functions more towards C11/Windows

[rurban]

I think you are right with clearing dest on dmax > MAX. I changed that in strncat_s, wcsncat_s with 19d4914 but we do it with slen > MAX. I reverted that in d0e31c8. I matches msvcrt better now.

For the whole slen=0 scenario we'll be much more forgiving and do the HAVE_C11 logic. But interestingly on some cases dest is cleared, on some not. Still have to evaluate where, why and how.

[Juno-Explorer]

I think handle_error for dmax > RSIZE_MAX is not needed.

A/c to standard,
If there is a runtime-constraint violation, then if s1 is not a null pointer and s1max is greater than zero and not greater than RSIZE_MAX, then strncpy_s sets s1[0] to the null character.

It clearly states that to set dest[0] = ‘\0’ dmax should be greater than 0 and less than RSIZE_MAX. So using handle_error for dmax > RSIZE_MAX is deviation from C11 Standard.

Moreover for slen = 0 standard doesn’t claim that it’s an error scenario (which I have already stated in issue#31) and other compilers which support C11 i.e IAR ARM and MSC doesn’t update destination at all when slen = 0.

I think your changes to cater this issue would make your implementation to deviate from C11 standard.