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Annotation of OpenXM_contrib/gmp/mpz/get_si.c, Revision 1.1

1.1     ! maekawa     1: /* mpz_get_si(integer) -- Return the least significant digit from INTEGER.
        !             2:
        !             3: Copyright (C) 1991, 1993, 1994, 1995 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 the GNU Library General Public License as published by
        !             9: the Free Software Foundation; either version 2 of the License, or (at your
        !            10: option) any later version.
        !            11:
        !            12: The GNU MP Library is distributed in the hope that it will be useful, but
        !            13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            14: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
        !            15: License for more details.
        !            16:
        !            17: You should have received a copy of the GNU Library General Public License
        !            18: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            20: MA 02111-1307, USA. */
        !            21:
        !            22: #include "gmp.h"
        !            23: #include "gmp-impl.h"
        !            24:
        !            25: signed long int
        !            26: #if __STDC__
        !            27: mpz_get_si (mpz_srcptr op)
        !            28: #else
        !            29: mpz_get_si (op)
        !            30:      mpz_srcptr op;
        !            31: #endif
        !            32: {
        !            33:   mp_size_t size = op->_mp_size;
        !            34:   mp_limb_t low_limb = op->_mp_d[0];
        !            35:
        !            36:   if (size > 0)
        !            37:     return low_limb % ((mp_limb_t) 1 << (BITS_PER_MP_LIMB - 1));
        !            38:   else if (size < 0)
        !            39:     /* This convoluted expression is necessary to properly handle 0x80000000 */
        !            40:     return ~((low_limb - 1) % ((mp_limb_t) 1 << (BITS_PER_MP_LIMB - 1)));
        !            41:   else
        !            42:     return 0;
        !            43: }