realloc.c
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上传日期:2022-08-06
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文件大小:2k
- /* _mpz_realloc -- make the mpz_t have NEW_ALLOC digits allocated.
- Copyright 1991, 1993, 1994, 1995, 2000, 2001, 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_realloc (mpz_ptr m, mp_size_t new_alloc)
- {
- mp_ptr mp;
- /* Never allocate zero space. */
- new_alloc = MAX (new_alloc, 1);
- if (sizeof (mp_size_t) == sizeof (int))
- {
- if (UNLIKELY (new_alloc > ULONG_MAX / GMP_NUMB_BITS))
- {
- fprintf (stderr, "gmp: overflow in mpz typen");
- abort ();
- }
- }
- else
- {
- if (UNLIKELY (new_alloc > INT_MAX))
- {
- fprintf (stderr, "gmp: overflow in mpz typen");
- abort ();
- }
- }
- mp = __GMP_REALLOCATE_FUNC_LIMBS (PTR(m), ALLOC(m), new_alloc);
- PTR(m) = mp;
- ALLOC(m) = new_alloc;
- /* Don't create an invalid number; if the current value doesn't fit after
- reallocation, clear it to 0. */
- if (ABSIZ(m) > new_alloc)
- SIZ(m) = 0;
- return (void *) mp;
- }