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Artin decomposition for p-adic numbers

How can I decompose a p-adic number

... d_2 d_1 d_0. d_{-1} ... d_{-k}

into its integer part

d_2 d_1 d_0.

and fractional part

. d_{-1} ... d_{-k} ?

The does not seem to exist a kind of floor function.