I want to simply rotate the byte in Buf[x] but not through the "Carry".Is there another way of doing this?

Here we go again. Part of the 'C' specification is that the compiler can do whatever it wants, feels like or fancies with registers and such, it is not the concern of the user.

when using C you have no control over internal registers in the processor

If you are concerneed abou wjhat happend to the CY bit do not use C.

Erik