pqc/external/flint-2.4.3/padic/fprint.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 <limits.h>
#include "padic.h"
int _padic_fprint(FILE * file, const fmpz_t u, slong v, const padic_ctx_t ctx)
{
const fmpz *p = ctx->p;
if (fmpz_is_zero(u))
{
fputc('0', file);
return 1;
}
if (ctx->mode == PADIC_TERSE)
{
if (v == 0)
{
fmpz_fprint(file, u);
}
else if (v > 0)
{
fmpz_t t;
fmpz_init(t);
fmpz_pow_ui(t, p, v);
fmpz_mul(t, t, u);
fmpz_fprint(file, t);
fmpz_clear(t);
}
else /* v < 0 */
{
fmpz_t t;
fmpz_init(t);
fmpz_pow_ui(t, p, -v);
_fmpq_fprint(file, u, t);
fmpz_clear(t);
}
}
else if (ctx->mode == PADIC_SERIES)
{
fmpz_t x;
fmpz_t d;
slong j;
fmpz_init(d);
fmpz_init(x);
fmpz_set(x, u);
/* Unroll first step */
j = 0;
{
fmpz_mod(d, x, p); /* d = u mod p^{j+1} */
fmpz_sub(x, x, d); /* x = x - d */
fmpz_divexact(x, x, p); /* x = x / p */
if (!fmpz_is_zero(d))
{
if (j + v != 0)
{
fmpz_fprint(file, d);
fputc('*', file);
fmpz_fprint(file, p);
flint_fprintf(file, "^%wd", j + v);
}
else
{
fmpz_fprint(file, d);
}
}
j++;
}
for ( ; !fmpz_is_zero(x); j++)
{
fmpz_mod(d, x, p); /* d = u mod p^{j+1} */
fmpz_sub(x, x, d); /* x = x - d */
fmpz_divexact(x, x, p); /* x = x / p */
if (!fmpz_is_zero(d))
{
if (j + v != 0)
{
flint_fprintf(file, " + ");
fmpz_fprint(file, d);
fputc('*', file);
fmpz_fprint(file, p);
flint_fprintf(file, "^%wd", j + v);
}
else
{
flint_fprintf(file, " + ");
fmpz_fprint(file, d);
}
}
}
fmpz_clear(x);
fmpz_clear(d);
}
else if (ctx->mode == PADIC_VAL_UNIT)
{
if (v == 0)
{
fmpz_fprint(file, u);
}
else if (v == 1)
{
fmpz_fprint(file, u);
fputc('*', file);
fmpz_fprint(file, p);
}
else
{
fmpz_fprint(file, u);
fputc('*', file);
fmpz_fprint(file, p);
flint_fprintf(file, "^%wd", v);
}
}
else
{
flint_printf("Exception (_padic_fprint). Unknown print mode.\n");
abort();
}
return 1;
}
int padic_fprint(FILE * file, const padic_t op, const padic_ctx_t ctx)
{
return _padic_fprint(file, padic_unit(op), padic_val(op), ctx);
}