pqc/external/flint-2.4.3/qadic/fprint_pretty.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 "qadic.h"
#include "padic.h"
int _qadic_fprint_pretty(FILE * file, const fmpz *u, slong len, slong v,
const qadic_ctx_t ctx)
{
const fmpz *p = (&ctx->pctx)->p;
if (_fmpz_vec_is_zero(u, len))
{
fputc('0', file);
return 1;
}
if ((&ctx->pctx)->mode == PADIC_TERSE)
{
if (v == 0)
{
_fmpz_poly_fprint_pretty(file, u, len, ctx->var);
}
else if (v > 0)
{
fmpz *t = _fmpz_vec_init(len + 1);
fmpz_pow_ui(t + len, p, v);
_fmpz_vec_scalar_mul_fmpz(t, u, len, t + len);
_fmpz_poly_fprint_pretty(file, t, len, ctx->var);
_fmpz_vec_clear(t, len + 1);
}
else /* v < 0 */
{
fmpz_t t;
fmpz_init(t);
fmpz_pow_ui(t, p, -v);
_fmpq_poly_fprint_pretty(file, u, t, len, ctx->var);
fmpz_clear(t);
}
}
else if ((&ctx->pctx)->mode == PADIC_SERIES)
{
fmpz *x, *d;
slong i, j;
for (i = 0; i < len; i++)
if (fmpz_sgn(u + i) < 0)
break;
if (i < len)
{
flint_printf("ERROR (qadic_fprint_pretty). u < 0 in SERIES mode.\n");
abort();
}
x = _fmpz_vec_init(len);
d = _fmpz_vec_init(len);
_fmpz_vec_set(x, u, len);
/* Unroll first step */
j = 0;
{
_fmpz_vec_scalar_mod_fmpz(d, x, len, p); /* d = u mod p^{j+1} */
_fmpz_vec_sub(x, x, d, len); /* x = x - d */
_fmpz_vec_scalar_divexact_fmpz(x, x, len, p); /* x = x / p */
if (!_fmpz_vec_is_zero(d, len))
{
fputc('(', file);
_fmpz_poly_fprint_pretty(file, d, len, ctx->var);
fputc(')', file);
if (j + v != 0)
{
fputc('*', file);
fmpz_fprint(file, p);
if (j + v != 1)
flint_fprintf(file, "^%wd", j + v);
}
}
j++;
}
for ( ; !_fmpz_vec_is_zero(x, len); j++)
{
_fmpz_vec_scalar_mod_fmpz(d, x, len, p); /* d = u mod p^{j+1} */
_fmpz_vec_sub(x, x, d, len); /* x = x - d */
_fmpz_vec_scalar_divexact_fmpz(x, x, len, p); /* x = x / p */
if (!_fmpz_vec_is_zero(d, len))
{
flint_fprintf(file, " + ");
fputc('(', file);
_fmpz_poly_fprint_pretty(file, d, len, ctx->var);
fputc(')', file);
if (j + v != 0)
{
fputc('*', file);
fmpz_fprint(file, p);
if (j + v != 1)
flint_fprintf(file, "^%wd", j + v);
}
}
}
_fmpz_vec_clear(x, len);
_fmpz_vec_clear(d, len);
}
else if ((&ctx->pctx)->mode == PADIC_VAL_UNIT)
{
if (v == 0)
{
_fmpz_poly_fprint_pretty(file, u, len, ctx->var);
}
else if (v == 1)
{
fputc('(', file);
_fmpz_poly_fprint_pretty(file, u, len, ctx->var);
fputc(')', file);
fputc('*', file);
fmpz_fprint(file, p);
}
else
{
fputc('(', file);
_fmpz_poly_fprint_pretty(file, u, len, ctx->var);
fputc(')', file);
fputc('*', file);
fmpz_fprint(file, p);
flint_fprintf(file, "^%wd", v);
}
}
else
{
flint_printf("Exception (qadic_fprint_pretty). Unknown print mode.\n");
abort();
}
return 1;
}
int qadic_fprint_pretty(FILE *file, const qadic_t op, const qadic_ctx_t ctx)
{
return _qadic_fprint_pretty(file, op->coeffs, op->length, op->val, ctx);
}