93 lines
2.6 KiB
C
93 lines
2.6 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 Sebastian Pancratz
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******************************************************************************/
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#include <stdlib.h>
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#include <stdio.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 "fmpq_poly.h"
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char * fmpq_poly_get_str(const fmpq_poly_t poly)
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{
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slong i;
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size_t j;
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size_t len; /* Upper bound on the length */
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size_t denlen; /* Size of the denominator in base 10 */
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mpz_t z;
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mpq_t q;
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char * str;
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if (poly->length == 0)
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{
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str = (char *) flint_malloc(2 * sizeof(char));
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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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mpz_init(z);
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if (*poly->den == WORD(1))
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{
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denlen = 0;
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}
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else
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{
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fmpz_get_mpz(z, poly->den);
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denlen = mpz_sizeinbase(z, 10);
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}
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len = (size_t) ceil(log10((double) (poly->length + 1))) + (size_t) 2;
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for (i = 0; i < poly->length; i++)
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{
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fmpz_get_mpz(z, poly->coeffs + i);
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len += mpz_sizeinbase(z, 10) + (size_t) 1;
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if (mpz_sgn(z))
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len += denlen + (size_t) 2;
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}
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mpq_init(q);
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str = (char *) flint_malloc(len * sizeof(char));
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j = flint_sprintf(str, "%li", poly->length);
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str[j++] = ' ';
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for (i = 0; i < poly->length; i++)
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{
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str[j++] = ' ';
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fmpz_get_mpz(mpq_numref(q), poly->coeffs + i);
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fmpz_get_mpz(mpq_denref(q), poly->den);
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mpq_canonicalize(q);
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mpq_get_str(str + j, 10, q);
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j += strlen(str + j);
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}
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mpq_clear(q);
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mpz_clear(z);
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return str;
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}
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