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

1.1     ! maekawa     1: /* mpz_mod -- The mathematical mod function.
        !             2:
        !             3: Copyright (C) 1991, 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
        !             4:
        !             5: This file is part of the GNU MP Library.
        !             6:
        !             7: The GNU MP Library is free software; you can redistribute it and/or modify
        !             8: it under the terms of the GNU Library General Public License as published by
        !             9: the Free Software Foundation; either version 2 of the License, or (at your
        !            10: option) any later version.
        !            11:
        !            12: The GNU MP Library is distributed in the hope that it will be useful, but
        !            13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
        !            15: License for more details.
        !            16:
        !            17: You should have received a copy of the GNU Library General Public License
        !            18: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            20: MA 02111-1307, USA. */
        !            21:
        !            22: #include "gmp.h"
        !            23: #include "gmp-impl.h"
        !            24:
        !            25: void
        !            26: #if __STDC__
        !            27: mpz_mod (mpz_ptr rem, mpz_srcptr dividend, mpz_srcptr divisor)
        !            28: #else
        !            29: mpz_mod (rem, dividend, divisor)
        !            30:      mpz_ptr rem;
        !            31:      mpz_srcptr dividend;
        !            32:      mpz_srcptr divisor;
        !            33: #endif
        !            34: {
        !            35:   mp_size_t divisor_size = divisor->_mp_size;
        !            36:   mpz_t temp_divisor;          /* N.B.: lives until function returns! */
        !            37:   TMP_DECL (marker);
        !            38:
        !            39:   TMP_MARK (marker);
        !            40:
        !            41:   /* We need the original value of the divisor after the remainder has been
        !            42:      preliminary calculated.  We have to copy it to temporary space if it's
        !            43:      the same variable as REM.  */
        !            44:   if (rem == divisor)
        !            45:     {
        !            46:       MPZ_TMP_INIT (temp_divisor, ABS (divisor_size));
        !            47:       mpz_set (temp_divisor, divisor);
        !            48:       divisor = temp_divisor;
        !            49:     }
        !            50:
        !            51:   mpz_tdiv_r (rem, dividend, divisor);
        !            52:
        !            53:   if (rem->_mp_size != 0)
        !            54:     {
        !            55:       if (dividend->_mp_size < 0)
        !            56:        if (divisor->_mp_size < 0)
        !            57:          mpz_sub (rem, rem, divisor);
        !            58:        else
        !            59:          mpz_add (rem, rem, divisor);
        !            60:     }
        !            61:
        !            62:   TMP_FREE (marker);
        !            63: }