+++ /dev/null
-/* mpz_tstbit -- test a specified bit. Simulate 2's complement representation.
-
-Copyright (C) 1997 Free Software Foundation, Inc.
-
-This file is part of the GNU MP Library.
-
-The GNU MP Library is free software; you can redistribute it and/or modify
-it under the terms of the GNU Lesser General Public License as published by
-the Free Software Foundation; either version 2.1 of the License, or (at your
-option) any later version.
-
-The GNU MP Library is distributed in the hope that it will be useful, but
-WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
-or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
-License for more details.
-
-You should have received a copy of the GNU Lesser General Public License
-along with the GNU MP Library; see the file COPYING.LIB. If not, write to
-the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
-MA 02111-1307, USA. */
-
-#include "gmp.h"
-#include "gmp-impl.h"
-
-int
-#if __STDC__
-mpz_tstbit (mpz_srcptr d, unsigned long int bit_index)
-#else
-mpz_tstbit (d, bit_index)
- mpz_srcptr d;
- unsigned long int bit_index;
-#endif
-{
- mp_size_t dsize = d->_mp_size;
- mp_ptr dp = d->_mp_d;
- mp_size_t limb_index;
-
- limb_index = bit_index / BITS_PER_MP_LIMB;
- if (dsize >= 0)
- {
- if (limb_index < dsize)
- return (dp[limb_index] >> (bit_index % BITS_PER_MP_LIMB)) & 1;
- else
- /* Testing a bit outside of a positive number. */
- return 0;
- }
- else
- {
- mp_size_t zero_bound;
-
- dsize = -dsize;
-
- /* Locate the least significant non-zero limb. */
- for (zero_bound = 0; dp[zero_bound] == 0; zero_bound++)
- ;
-
- if (limb_index > zero_bound)
- {
- if (limb_index < dsize)
- return (~dp[limb_index] >> (bit_index % BITS_PER_MP_LIMB)) & 1;
- else
- /* Testing a bit outside of a negative number. */
- return 1;
- }
- else if (limb_index == zero_bound)
- return (-dp[limb_index] >> (bit_index % BITS_PER_MP_LIMB)) & 1;
- else
- return 0;
- }
-}