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: }
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