1/* _mpz_realloc -- make the mpz_t have NEW_ALLOC digits allocated. 2 3Copyright 1991, 1993, 1994, 1995, 2000, 2001, 2008 Free Software Foundation, 4Inc. 5 6This file is part of the GNU MP Library. 7 8The GNU MP Library is free software; you can redistribute it and/or modify 9it under the terms of the GNU Lesser General Public License as published by 10the Free Software Foundation; either version 3 of the License, or (at your 11option) any later version. 12 13The GNU MP Library is distributed in the hope that it will be useful, but 14WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 15or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 16License for more details. 17 18You should have received a copy of the GNU Lesser General Public License 19along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */ 20 21#include <stdlib.h> 22#include <stdio.h> 23#include "gmp.h" 24#include "gmp-impl.h" 25 26void * 27_mpz_realloc (mpz_ptr m, mp_size_t new_alloc) 28{ 29 mp_ptr mp; 30 31 /* Never allocate zero space. */ 32 new_alloc = MAX (new_alloc, 1); 33 34 if (sizeof (mp_size_t) == sizeof (int)) 35 { 36 if (UNLIKELY (new_alloc > ULONG_MAX / GMP_NUMB_BITS)) 37 { 38 fprintf (stderr, "gmp: overflow in mpz type\n"); 39 abort (); 40 } 41 } 42 else 43 { 44 if (UNLIKELY (new_alloc > INT_MAX)) 45 { 46 fprintf (stderr, "gmp: overflow in mpz type\n"); 47 abort (); 48 } 49 } 50 51 mp = __GMP_REALLOCATE_FUNC_LIMBS (PTR(m), ALLOC(m), new_alloc); 52 PTR(m) = mp; 53 ALLOC(m) = new_alloc; 54 55 /* Don't create an invalid number; if the current value doesn't fit after 56 reallocation, clear it to 0. */ 57 if (ABSIZ(m) > new_alloc) 58 SIZ(m) = 0; 59 60 return (void *) mp; 61} 62