iset.c
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上传日期:2022-08-06
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- /* mpz_init_set (src_integer) -- Make a new multiple precision number with
- a value copied from SRC_INTEGER.
- Copyright 1991, 1993, 1994, 1996, 2000, 2001, 2002 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_init_set (mpz_ptr w, mpz_srcptr u)
- {
- mp_ptr wp, up;
- mp_size_t usize, size;
- usize = u->_mp_size;
- size = ABS (usize);
- w->_mp_alloc = MAX (size, 1);
- w->_mp_d = (mp_ptr) (*__gmp_allocate_func) (w->_mp_alloc * BYTES_PER_MP_LIMB);
- wp = w->_mp_d;
- up = u->_mp_d;
- MPN_COPY (wp, up, size);
- w->_mp_size = usize;
- #ifdef __CHECKER__
- /* let the low limb look initialized, for the benefit of mpz_get_ui etc */
- if (size == 0)
- wp[0] = 0;
- #endif
- }