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Annotation of OpenXM_contrib/gmp/mpz/jacobi.c, Revision 1.1

1.1     ! maekawa     1: /* mpz_jacobi (op1, op2).
        !             2:    Contributed by Bennet Yee (bsy) at Carnegie-Mellon University
        !             3:
        !             4: Copyright (C) 1991, 1996 Free Software Foundation, Inc.
        !             5:
        !             6: This file is part of the GNU MP Library.
        !             7:
        !             8: The GNU MP Library is free software; you can redistribute it and/or modify
        !             9: it under the terms of the GNU Library General Public License as published by
        !            10: the Free Software Foundation; either version 2 of the License, or (at your
        !            11: option) any later version.
        !            12:
        !            13: The GNU MP Library is distributed in the hope that it will be useful, but
        !            14: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
        !            16: License for more details.
        !            17:
        !            18: You should have received a copy of the GNU Library General Public License
        !            19: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            21: MA 02111-1307, USA. */
        !            22:
        !            23: #include "gmp.h"
        !            24:
        !            25: /* Precondition:  both p and q are positive */
        !            26:
        !            27: int
        !            28: #if    __STDC__
        !            29: mpz_jacobi (mpz_srcptr pi, mpz_srcptr qi)
        !            30: #else
        !            31: mpz_jacobi (pi, qi)
        !            32:      mpz_srcptr pi, qi;
        !            33: #endif
        !            34: {
        !            35: #if GCDCHECK
        !            36:   int retval;
        !            37:   mpz_t gcdval;
        !            38:
        !            39:   mpz_init (gcdval);
        !            40:   mpz_gcd (gcdval, pi, qi);
        !            41:   if (!mpz_cmp_ui (gcdval, 1L))
        !            42:     {
        !            43:       /* J(ab,cb) = J(ab,c)J(ab,b) = J(ab,c)J(0,b) = J(ab,c)*0 */
        !            44:       retval = 0;
        !            45:     }
        !            46:   else
        !            47:     retval = mpz_legendre (pi, qi);
        !            48:   mpz_clear (gcdval);
        !            49:   return retval;
        !            50: #else
        !            51:   return mpz_legendre (pi, qi);
        !            52: #endif
        !            53: }