1 /* _mpz_realloc -- make the mpz_t have NEW_ALLOC digits allocated. 2 3 Copyright 1991, 1993-1995, 2000, 2001, 2008 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.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 mp = __GMP_REALLOCATE_FUNC_LIMBS (PTR(m), ALLOC(m), new_alloc); 62 PTR(m) = mp; 63 ALLOC(m) = new_alloc; 64 65 /* Don't create an invalid number; if the current value doesn't fit after 66 reallocation, clear it to 0. */ 67 if (ABSIZ(m) > new_alloc) 68 SIZ(m) = 0; 69 70 return (void *) mp; 71 } 72