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/*
Copyright (C) 2011 Sebastian Pancratz
This file is part of FLINT.
FLINT is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include "fmpz_vec.h"
#include "padic.h"
#include "padic_poly.h"
void padic_poly_set_fmpq_poly(padic_poly_t f,
const fmpq_poly_t g, const padic_ctx_t ctx)
{
const slong len = g->length;
if (len == 0)
{
padic_poly_zero(f);
}
else
{
const slong N = padic_poly_prec(f);
fmpz_t t;
fmpz_init(t);
f->val = - fmpz_remove(t, g->den, ctx->p);
if (f->val < N)
{
padic_poly_fit_length(f, len);
_padic_poly_set_length(f, len);
_padic_inv(t, t, ctx->p, N - f->val);
_fmpz_vec_scalar_mul_fmpz(f->coeffs, g->coeffs, len, t);
if (f->val == 0)
padic_poly_canonicalise(f, ctx->p);
padic_poly_reduce(f, ctx);
}
else
{
padic_poly_zero(f);
}
fmpz_clear(t);
}
}