pqc/external/flint-2.4.3/fmpq_poly/realloc.c
2014-05-24 23:16:06 +02:00

66 lines
2.1 KiB
C

/*=============================================================================
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) 2010 William Hart
Copyright (C) 2010 Sebastian Pancratz
******************************************************************************/
#include <gmp.h>
#include <stdlib.h>
#include "flint.h"
#include "fmpz.h"
#include "fmpq_poly.h"
void fmpq_poly_realloc(fmpq_poly_t poly, slong alloc)
{
if (alloc == 0) /* Clear up, reinitialise */
{
fmpq_poly_clear(poly);
fmpq_poly_init(poly);
return;
}
if (poly->alloc) /* Realloc */
{
if (poly->length > alloc) /* Reduce the size */
{
slong i;
for (i = alloc; i < poly->length; i++)
_fmpz_demote(poly->coeffs + i);
poly->length = alloc;
_fmpq_poly_normalise(poly);
}
poly->coeffs = (fmpz *) flint_realloc(poly->coeffs, alloc * sizeof(fmpz));
if (poly->alloc < alloc)
{
flint_mpn_zero((mp_ptr) (poly->coeffs + poly->alloc), alloc - poly->alloc);
}
}
else /* Nothing allocated, do it now */
{
poly->coeffs = (fmpz *) flint_calloc(alloc, sizeof(fmpz));
}
poly->alloc = alloc;
}