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/*=============================================================================
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, 2011 Sebastian Pancratz
******************************************************************************/
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <gmp.h>
#include "flint.h"
#include "fmpz.h"
#include "fmpz_poly.h"
char *
_fmpz_poly_get_str_pretty(const fmpz * poly, slong len, const char *x)
{
char *str;
size_t off;
slong i, bound, nz;
if (len == 0)
{
str = flint_malloc(2);
str[0] = '0';
str[1] = '\0';
return str;
}
if (len == 1)
{
str = fmpz_get_str(NULL, 10, poly);
return str;
}
nz = 0;
bound = 1;
for (i = 0; i < len; i++)
if (!fmpz_is_zero(poly + i))
{
bound += fmpz_sizeinbase(poly + i, 10) + 1;
nz++;
}
bound += nz * (3 + strlen(x) + (slong) (ceil(log10(len))));
str = flint_malloc(bound);
off = 0;
i = len - 1;
if (poly[i] == WORD(1))
{
}
else if (poly[i] == WORD(-1))
str[off++] = '-';
else if (!COEFF_IS_MPZ(poly[i]))
off += flint_sprintf(str + off, "%wd*", poly[i]);
else
off += gmp_sprintf(str + off, "%Zd*", COEFF_TO_PTR(poly[i]));
if (i > 1)
off += flint_sprintf(str + off, "%s^%wd", x, i);
else
off += flint_sprintf(str + off, "%s", x);
for (--i; i > 0; --i)
{
if (poly[i] == WORD(0))
continue;
if (fmpz_sgn(poly + i) > 0)
str[off++] = '+';
if (poly[i] == WORD(-1))
str[off++] = '-';
if (poly[i] != WORD(1) && poly[i] != WORD(-1))
{
if (!COEFF_IS_MPZ(poly[i]))
off += flint_sprintf(str + off, "%wd*", poly[i]);
else
off += gmp_sprintf(str + off, "%Zd*", COEFF_TO_PTR(poly[i]));
}
if (i > 1)
off += flint_sprintf(str + off, "%s^%wd", x, i);
else
off += flint_sprintf(str + off, "%s", x);
}
if (poly[i] != WORD(0))
{
if (fmpz_sgn(poly + i) > 0)
str[off++] = '+';
if (!COEFF_IS_MPZ(poly[i]))
off += flint_sprintf(str + off, "%wd", poly[i]);
else
off += gmp_sprintf(str + off, "%Zd", COEFF_TO_PTR(poly[i]));
}
return str;
}
char *
fmpz_poly_get_str_pretty(const fmpz_poly_t poly, const char *x)
{
return _fmpz_poly_get_str_pretty(poly->coeffs, poly->length, x);
}
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