Annotation of OpenXM_contrib/gmp/mpz/get_si.c, Revision 1.1.1.3
1.1 maekawa 1: /* mpz_get_si(integer) -- Return the least significant digit from INTEGER.
2:
1.1.1.3 ! ohara 3: Copyright 1991, 1993, 1994, 1995, 2000, 2001, 2002 Free Software Foundation,
! 4: Inc.
1.1 maekawa 5:
6: This file is part of the GNU MP Library.
7:
8: The GNU MP Library is free software; you can redistribute it and/or modify
1.1.1.2 maekawa 9: it under the terms of the GNU Lesser General Public License as published by
10: the Free Software Foundation; either version 2.1 of the License, or (at your
1.1 maekawa 11: option) any later version.
12:
13: The GNU MP Library is distributed in the hope that it will be useful, but
14: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
1.1.1.2 maekawa 15: or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
1.1 maekawa 16: License for more details.
17:
1.1.1.2 maekawa 18: You should have received a copy of the GNU Lesser General Public License
1.1 maekawa 19: along with the GNU MP Library; see the file COPYING.LIB. If not, write to
20: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
21: MA 02111-1307, USA. */
22:
23: #include "gmp.h"
24: #include "gmp-impl.h"
25:
26: signed long int
1.1.1.3 ! ohara 27: mpz_get_si (mpz_srcptr z)
1.1 maekawa 28: {
1.1.1.3 ! ohara 29: mp_ptr zp = z->_mp_d;
! 30: mp_size_t size = z->_mp_size;
! 31: mp_limb_t zl = zp[0];
! 32:
! 33: #if GMP_NAIL_BITS != 0
! 34: if (ULONG_MAX > GMP_NUMB_MAX != 0 && ABS (size) >= 2)
! 35: zl |= zp[1] << GMP_NUMB_BITS;
! 36: #endif
1.1 maekawa 37:
38: if (size > 0)
1.1.1.3 ! ohara 39: return (long) zl & LONG_MAX;
1.1 maekawa 40: else if (size < 0)
1.1.1.3 ! ohara 41: /* This expression is necessary to properly handle 0x80000000 */
! 42: return ~(((long) zl - 1L) & LONG_MAX);
1.1 maekawa 43: else
44: return 0;
45: }
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>