mod.c
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上传日期:2022-08-06
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- /* mpz_mod -- The mathematical mod function.
- Copyright 1991, 1993, 1994, 1995, 1996, 2001, 2002, 2005 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 3 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. If not, see http://www.gnu.org/licenses/. */
- #include "gmp.h"
- #include "gmp-impl.h"
- void
- mpz_mod (mpz_ptr rem, mpz_srcptr dividend, mpz_srcptr divisor)
- {
- mp_size_t divisor_size = divisor->_mp_size;
- mpz_t temp_divisor; /* N.B.: lives until function returns! */
- TMP_DECL;
- TMP_MARK;
- /* We need the original value of the divisor after the remainder has been
- preliminary calculated. We have to copy it to temporary space if it's
- the same variable as REM. */
- if (rem == divisor)
- {
- MPZ_TMP_INIT (temp_divisor, ABS (divisor_size));
- mpz_set (temp_divisor, divisor);
- divisor = temp_divisor;
- }
- mpz_tdiv_r (rem, dividend, divisor);
- if (rem->_mp_size != 0)
- {
- if (dividend->_mp_size < 0)
- {
- if (divisor->_mp_size < 0)
- mpz_sub (rem, rem, divisor);
- else
- mpz_add (rem, rem, divisor);
- }
- }
- TMP_FREE;
- }