init2.c
上传用户:qaz666999
上传日期:2022-08-06
资源大小:2570k
文件大小:1k
- /* mpz_init2 -- initialize mpz, with requested size in bits.
- Copyright 2001, 2002, 2008 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 <stdlib.h>
- #include <stdio.h>
- #include "gmp.h"
- #include "gmp-impl.h"
- void
- mpz_init2 (mpz_ptr x, mp_bitcnt_t bits)
- {
- mp_size_t new_alloc;
- bits -= (bits != 0); /* Round down, except if 0 */
- new_alloc = 1 + bits / GMP_NUMB_BITS;
- if (sizeof (unsigned long) > sizeof (int)) /* param vs _mp_size field */
- {
- if (UNLIKELY (new_alloc > INT_MAX))
- {
- fprintf (stderr, "gmp: overflow in mpz typen");
- abort ();
- }
- }
- PTR(x) = __GMP_ALLOCATE_FUNC_LIMBS (new_alloc);
- ALLOC(x) = new_alloc;
- SIZ(x) = 0;
- #ifdef __CHECKER__
- /* let the low limb look initialized, for the benefit of mpz_get_ui etc */
- PTR(x)[0] = 0;
- #endif
- }