pqc/external/flint-2.4.3/padic/set_fmpq.c

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2014-05-18 22:03:37 +00:00
/*=============================================================================
This file is part of FLINT.
FLINT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
FLINT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with FLINT; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
=============================================================================*/
/******************************************************************************
Copyright (C) 2011, 2012 Sebastian Pancratz
******************************************************************************/
#include "padic.h"
void padic_set_fmpq(padic_t rop, const fmpq_t op, const padic_ctx_t ctx)
{
if (fmpq_is_zero(op))
{
padic_zero(rop);
}
else
{
fmpq_t t;
fmpq_init(t);
padic_val(rop) = fmpz_remove(fmpq_numref(t), fmpq_numref(op), ctx->p);
padic_val(rop) -= fmpz_remove(fmpq_denref(t), fmpq_denref(op), ctx->p);
if (padic_val(rop) >= padic_prec(rop))
{
padic_zero(rop);
}
else
{
_padic_inv(fmpq_denref(t),
fmpq_denref(t), ctx->p, padic_prec(rop) - padic_val(rop));
fmpz_mul(padic_unit(rop), fmpq_numref(t), fmpq_denref(t));
_padic_reduce(rop, ctx);
}
fmpq_clear(t);
}
}