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Annotation of OpenXM_contrib/gmp/mpz/mod.c, Revision 1.1.1.3

1.1       maekawa     1: /* mpz_mod -- The mathematical mod function.
                      2:
1.1.1.3 ! ohara       3: Copyright 1991, 1993, 1994, 1995, 1996, 2001, 2002 Free Software Foundation,
        !             4: Inc.
1.1       maekawa     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
1.1.1.2   maekawa     9: it under the terms of the GNU Lesser General Public License as published by
                     10: the Free Software Foundation; either version 2.1 of the License, or (at your
1.1       maekawa    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
1.1.1.2   maekawa    15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
1.1       maekawa    16: License for more details.
                     17:
1.1.1.2   maekawa    18: You should have received a copy of the GNU Lesser General Public License
1.1       maekawa    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: #include "gmp-impl.h"
                     25:
                     26: void
                     27: mpz_mod (mpz_ptr rem, mpz_srcptr dividend, mpz_srcptr divisor)
                     28: {
                     29:   mp_size_t divisor_size = divisor->_mp_size;
                     30:   mpz_t temp_divisor;          /* N.B.: lives until function returns! */
                     31:   TMP_DECL (marker);
                     32:
                     33:   TMP_MARK (marker);
                     34:
                     35:   /* We need the original value of the divisor after the remainder has been
                     36:      preliminary calculated.  We have to copy it to temporary space if it's
                     37:      the same variable as REM.  */
                     38:   if (rem == divisor)
                     39:     {
                     40:       MPZ_TMP_INIT (temp_divisor, ABS (divisor_size));
                     41:       mpz_set (temp_divisor, divisor);
                     42:       divisor = temp_divisor;
                     43:     }
                     44:
                     45:   mpz_tdiv_r (rem, dividend, divisor);
                     46:
                     47:   if (rem->_mp_size != 0)
                     48:     {
                     49:       if (dividend->_mp_size < 0)
1.1.1.3 ! ohara      50:        {
        !            51:          if (divisor->_mp_size < 0)
        !            52:            mpz_sub (rem, rem, divisor);
        !            53:          else
        !            54:            mpz_add (rem, rem, divisor);
        !            55:        }
1.1       maekawa    56:     }
                     57:
                     58:   TMP_FREE (marker);
                     59: }