contrib/gmp/mpz/iset.c

   1 /* mpz_init_set (src_integer) -- Make a new multiple precision number with
   2    a value copied from SRC_INTEGER.
   3
   4 Copyright 1991, 1993, 1994, 1996, 2000, 2001, 2002 Free Software Foundation,
   5 Inc.
   6
   7 This file is part of the GNU MP Library.
   8
   9 The GNU MP Library is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU Lesser General Public License as published by
  11 the Free Software Foundation; either version 3 of the License, or (at your
  12 option) any later version.
  13
  14 The GNU MP Library is distributed in the hope that it will be useful, but
  15 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  16 or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  17 License for more details.
  18
  19 You should have received a copy of the GNU Lesser General Public License
  20 along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
  21
  22 #include "gmp.h"
  23 #include "gmp-impl.h"
  24
  25 void
  26 mpz_init_set (mpz_ptr w, mpz_srcptr u)
  27 {
  28   mp_ptr wp, up;
  29   mp_size_t usize, size;
  30
  31   usize = u->_mp_size;
  32   size = ABS (usize);
  33
  34   w->_mp_alloc = MAX (size, 1);
  35   w->_mp_d = (mp_ptr) (*__gmp_allocate_func) (w->_mp_alloc * BYTES_PER_MP_LIMB);
  36
  37   wp = w->_mp_d;
  38   up = u->_mp_d;
  39
  40   MPN_COPY (wp, up, size);
  41   w->_mp_size = usize;
  42
  43 #ifdef __CHECKER__
  44   /* let the low limb look initialized, for the benefit of mpz_get_ui etc */
  45   if (size == 0)
  46     wp[0] = 0;
  47 #endif
  48 }