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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: }