122 lines
3.3 KiB
C
122 lines
3.3 KiB
C
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/*=============================================================================
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This file is part of FLINT.
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FLINT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FLINT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FLINT; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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=============================================================================*/
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/******************************************************************************
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Copyright (C) 2010, 2011 Sebastian Pancratz
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******************************************************************************/
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include <gmp.h>
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#include "flint.h"
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#include "fmpz.h"
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#include "fmpz_poly.h"
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char *
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_fmpz_poly_get_str_pretty(const fmpz * poly, slong len, const char *x)
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{
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char *str;
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size_t off;
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slong i, bound, nz;
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if (len == 0)
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{
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str = flint_malloc(2);
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str[0] = '0';
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str[1] = '\0';
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return str;
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}
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if (len == 1)
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{
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str = fmpz_get_str(NULL, 10, poly);
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return str;
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}
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nz = 0;
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bound = 1;
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for (i = 0; i < len; i++)
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if (!fmpz_is_zero(poly + i))
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{
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bound += fmpz_sizeinbase(poly + i, 10) + 1;
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nz++;
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}
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bound += nz * (3 + strlen(x) + (slong) (ceil(log10(len))));
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str = flint_malloc(bound);
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off = 0;
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i = len - 1;
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if (poly[i] == WORD(1))
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{
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}
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else if (poly[i] == WORD(-1))
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str[off++] = '-';
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else if (!COEFF_IS_MPZ(poly[i]))
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off += flint_sprintf(str + off, "%wd*", poly[i]);
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else
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off += gmp_sprintf(str + off, "%Zd*", COEFF_TO_PTR(poly[i]));
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if (i > 1)
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off += flint_sprintf(str + off, "%s^%wd", x, i);
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else
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off += flint_sprintf(str + off, "%s", x);
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for (--i; i > 0; --i)
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{
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if (poly[i] == WORD(0))
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continue;
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if (fmpz_sgn(poly + i) > 0)
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str[off++] = '+';
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if (poly[i] == WORD(-1))
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str[off++] = '-';
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if (poly[i] != WORD(1) && poly[i] != WORD(-1))
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{
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if (!COEFF_IS_MPZ(poly[i]))
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off += flint_sprintf(str + off, "%wd*", poly[i]);
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else
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off += gmp_sprintf(str + off, "%Zd*", COEFF_TO_PTR(poly[i]));
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}
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if (i > 1)
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off += flint_sprintf(str + off, "%s^%wd", x, i);
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else
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off += flint_sprintf(str + off, "%s", x);
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}
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if (poly[i] != WORD(0))
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{
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if (fmpz_sgn(poly + i) > 0)
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str[off++] = '+';
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if (!COEFF_IS_MPZ(poly[i]))
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off += flint_sprintf(str + off, "%wd", poly[i]);
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else
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off += gmp_sprintf(str + off, "%Zd", COEFF_TO_PTR(poly[i]));
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}
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return str;
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}
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char *
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fmpz_poly_get_str_pretty(const fmpz_poly_t poly, const char *x)
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{
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return _fmpz_poly_get_str_pretty(poly->coeffs, poly->length, x);
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}
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