| Austin Schuh | bb1338c | 2024-06-15 19:31:16 -0700 | [diff] [blame] | 1 | /* mpz_realloc2 -- change allocated data size. |
| 2 | |
| 3 | Copyright 2001, 2002, 2008, 2015 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of the GNU MP Library. |
| 6 | |
| 7 | The GNU MP Library is free software; you can redistribute it and/or modify |
| 8 | it under the terms of either: |
| 9 | |
| 10 | * the GNU Lesser General Public License as published by the Free |
| 11 | Software Foundation; either version 3 of the License, or (at your |
| 12 | option) any later version. |
| 13 | |
| 14 | or |
| 15 | |
| 16 | * the GNU General Public License as published by the Free Software |
| 17 | Foundation; either version 2 of the License, or (at your option) any |
| 18 | later version. |
| 19 | |
| 20 | or both in parallel, as here. |
| 21 | |
| 22 | The GNU MP Library is distributed in the hope that it will be useful, but |
| 23 | WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 24 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 25 | for more details. |
| 26 | |
| 27 | You should have received copies of the GNU General Public License and the |
| 28 | GNU Lesser General Public License along with the GNU MP Library. If not, |
| 29 | see https://www.gnu.org/licenses/. */ |
| 30 | |
| 31 | #include <stdlib.h> |
| 32 | #include <stdio.h> |
| 33 | #include "gmp-impl.h" |
| 34 | |
| 35 | void |
| 36 | mpz_realloc2 (mpz_ptr m, mp_bitcnt_t bits) |
| 37 | { |
| 38 | mp_size_t new_alloc; |
| 39 | |
| 40 | bits -= (bits != 0); /* Round down, except if 0 */ |
| 41 | new_alloc = 1 + bits / GMP_NUMB_BITS; |
| 42 | |
| 43 | if (sizeof (unsigned long) > sizeof (int)) /* param vs _mp_size field */ |
| 44 | { |
| 45 | if (UNLIKELY (new_alloc > INT_MAX)) |
| 46 | { |
| 47 | fprintf (stderr, "gmp: overflow in mpz type\n"); |
| 48 | abort (); |
| 49 | } |
| 50 | } |
| 51 | |
| 52 | if (ALLOC (m) == 0) |
| 53 | { |
| 54 | PTR (m) = __GMP_ALLOCATE_FUNC_LIMBS (new_alloc); |
| 55 | } |
| 56 | else |
| 57 | { |
| 58 | PTR (m) = __GMP_REALLOCATE_FUNC_LIMBS (PTR(m), ALLOC(m), new_alloc); |
| 59 | |
| 60 | /* Don't create an invalid number; if the current value doesn't fit after |
| 61 | reallocation, clear it to 0. */ |
| 62 | if (ABSIZ(m) > new_alloc) |
| 63 | SIZ(m) = 0; |
| 64 | } |
| 65 | |
| 66 | ALLOC(m) = new_alloc; |
| 67 | } |