/* mpz_jacobi (op1, op2).
   Contributed by Bennet Yee (bsy) at Carnegie-Mellon University

Copyright (C) 1991, 1996 Free Software Foundation, Inc.

This file is part of the GNU MP Library.

The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version.

The GNU MP Library 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 Lesser General Public
License for more details.

You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */

#include "gmp.h"

/* Precondition:  both p and q are positive */

int
#if	__STDC__
mpz_jacobi (mpz_srcptr pi, mpz_srcptr qi)
#else
mpz_jacobi (pi, qi)
     mpz_srcptr pi, qi;
#endif
{
#if GCDCHECK
  int retval;
  mpz_t gcdval;

  mpz_init (gcdval);
  mpz_gcd (gcdval, pi, qi);
  if (!mpz_cmp_ui (gcdval, 1L))
    {
      /* J(ab,cb) = J(ab,c)J(ab,b) = J(ab,c)J(0,b) = J(ab,c)*0 */
      retval = 0;
    }
  else
    retval = mpz_legendre (pi, qi);
  mpz_clear (gcdval);
  return retval;
#else
  return mpz_legendre (pi, qi);
#endif
}
