| Austin Schuh | dace2a6 | 2020-08-18 10:56:48 -0700 | [diff] [blame^] | 1 | /* _mpz_realloc -- make the mpz_t have NEW_ALLOC digits allocated. |
| 2 | |
| 3 | Copyright 1991, 1993-1995, 2000, 2001, 2008, 2015 Free Software |
| 4 | Foundation, Inc. |
| 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 |
| 9 | it under the terms of either: |
| 10 | |
| 11 | * the GNU Lesser General Public License as published by the Free |
| 12 | Software Foundation; either version 3 of the License, or (at your |
| 13 | option) any later version. |
| 14 | |
| 15 | or |
| 16 | |
| 17 | * the GNU General Public License as published by the Free Software |
| 18 | Foundation; either version 2 of the License, or (at your option) any |
| 19 | later version. |
| 20 | |
| 21 | or both in parallel, as here. |
| 22 | |
| 23 | The GNU MP Library is distributed in the hope that it will be useful, but |
| 24 | WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 25 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 26 | for more details. |
| 27 | |
| 28 | You should have received copies of the GNU General Public License and the |
| 29 | GNU Lesser General Public License along with the GNU MP Library. If not, |
| 30 | see https://www.gnu.org/licenses/. */ |
| 31 | |
| 32 | #include <stdlib.h> |
| 33 | #include <stdio.h> |
| 34 | #include "gmp-impl.h" |
| 35 | |
| 36 | void * |
| 37 | _mpz_realloc (mpz_ptr m, mp_size_t new_alloc) |
| 38 | { |
| 39 | mp_ptr mp; |
| 40 | |
| 41 | /* Never allocate zero space. */ |
| 42 | new_alloc = MAX (new_alloc, 1); |
| 43 | |
| 44 | if (sizeof (mp_size_t) == sizeof (int)) |
| 45 | { |
| 46 | if (UNLIKELY (new_alloc > ULONG_MAX / GMP_NUMB_BITS)) |
| 47 | { |
| 48 | fprintf (stderr, "gmp: overflow in mpz type\n"); |
| 49 | abort (); |
| 50 | } |
| 51 | } |
| 52 | else |
| 53 | { |
| 54 | if (UNLIKELY (new_alloc > INT_MAX)) |
| 55 | { |
| 56 | fprintf (stderr, "gmp: overflow in mpz type\n"); |
| 57 | abort (); |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | if (ALLOC (m) == 0) |
| 62 | { |
| 63 | mp = __GMP_ALLOCATE_FUNC_LIMBS (new_alloc); |
| 64 | } |
| 65 | else |
| 66 | { |
| 67 | mp = __GMP_REALLOCATE_FUNC_LIMBS (PTR (m), ALLOC (m), new_alloc); |
| 68 | |
| 69 | /* Don't create an invalid number; if the current value doesn't fit after |
| 70 | reallocation, clear it to 0. */ |
| 71 | if (UNLIKELY (ABSIZ (m) > new_alloc)) |
| 72 | SIZ (m) = 0; |
| 73 | } |
| 74 | |
| 75 | PTR (m) = mp; |
| 76 | ALLOC(m) = new_alloc; |
| 77 | return (void *) mp; |
| 78 | } |