pqc/external/flint-2.4.3/fmpq_poly/set_str.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) 2010 Sebastian Pancratz
******************************************************************************/
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
#include <gmp.h>
#include "flint.h"
#include "fmpz.h"
#include "fmpz_vec.h"
#include "fmpq_poly.h"
int
_fmpq_poly_set_str(fmpz * poly, fmpz_t den, const char * str)
{
char * w;
slong i, len;
mpq_t * a;
len = atol(str);
if (len < 0)
return -1;
if (len == 0)
{
fmpz_one(den);
return 0;
}
a = (mpq_t *) flint_malloc(len * sizeof(mpq_t));
while (*str++ != ' ')
;
/* Find maximal gap between spaces and allocate w */
{
const char * s = str;
slong max;
for (max = 0; *s != '\0';)
{
slong cur;
for (s++, cur = 1; *s != ' ' && *s != '\0'; s++, cur++) ;
if (max < cur)
max = cur;
}
w = (char *) flint_malloc((max + 1) * sizeof(char));
}
for (i = 0; i < len; i++)
{
char * v;
int ans;
for (str++, v = w; *str != ' ' && *str != '\0';)
*v++ = *str++;
*v = '\0';
mpq_init(a[i]);
ans = mpq_set_str(a[i], w, 10);
/* If the format is not correct, clear up and return -1 */
if (ans)
{
int j;
for (j = 0; j <= i; j++)
mpq_clear(a[j]);
flint_free(a);
flint_free(w);
return -1;
}
}
_fmpq_poly_set_array_mpq(poly, den, (const mpq_t *) a, len);
for (i = 0; i < len; i++)
mpq_clear(a[i]);
flint_free(a);
flint_free(w);
return 0;
}
int
fmpq_poly_set_str(fmpq_poly_t poly, const char * str)
{
int ans;
slong len;
len = atol(str);
if (len < 0)
return -1;
if (len == 0)
{
fmpq_poly_zero(poly);
return 0;
}
fmpq_poly_fit_length(poly, len);
ans = _fmpq_poly_set_str(poly->coeffs, poly->den, str);
if (ans == 0)
{
_fmpq_poly_set_length(poly, len);
_fmpq_poly_normalise(poly);
}
else
{
_fmpz_vec_zero(poly->coeffs, len);
fmpz_one(poly->den);
_fmpq_poly_set_length(poly, 0);
}
return ans;
}