Return to cdiv_qr_ui.c CVS log

Up to [local] / OpenXM_contrib / gmp / mpz

Annotation of OpenXM_contrib/gmp/mpz/cdiv_qr_ui.c, Revision 1.1.1.2

1.1       maekawa     1: /* mpz_cdiv_qr_ui -- Division rounding the quotient towards +infinity.  The
                      2:    remainder gets the opposite sign as the denominator.  In order to make it
                      3:    always fit into the return type, the negative of the true remainder is
                      4:    returned.
                      5:
1.1.1.2 ! maekawa     6: Copyright (C) 1994, 1995, 1996, 1999 Free Software Foundation, Inc.
1.1       maekawa     7:
                      8: This file is part of the GNU MP Library.
                      9:
                     10: The GNU MP Library is free software; you can redistribute it and/or modify
1.1.1.2 ! maekawa    11: it under the terms of the GNU Lesser General Public License as published by
        !            12: the Free Software Foundation; either version 2.1 of the License, or (at your
1.1       maekawa    13: option) any later version.
                     14:
                     15: The GNU MP Library is distributed in the hope that it will be useful, but
                     16: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
1.1.1.2 ! maekawa    17: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
1.1       maekawa    18: License for more details.
                     19:
1.1.1.2 ! maekawa    20: You should have received a copy of the GNU Lesser General Public License
1.1       maekawa    21: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
                     22: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
                     23: MA 02111-1307, USA. */
                     24:
                     25: #include "gmp.h"
                     26: #include "gmp-impl.h"
                     27:
                     28: unsigned long int
                     29: #if __STDC__
                     30: mpz_cdiv_qr_ui (mpz_ptr quot, mpz_ptr rem, mpz_srcptr dividend, unsigned long int divisor)
                     31: #else
                     32: mpz_cdiv_qr_ui (quot, rem, dividend, divisor)
                     33:      mpz_ptr quot;
                     34:      mpz_ptr rem;
                     35:      mpz_srcptr dividend;
                     36:      unsigned long int divisor;
                     37: #endif
                     38: {
                     39:   mp_size_t dividend_size;
                     40:   mp_size_t size;
                     41:   mp_ptr quot_ptr;
                     42:   mp_limb_t remainder_limb;
                     43:
1.1.1.2 ! maekawa    44:   if (divisor == 0)
        !            45:     DIVIDE_BY_ZERO;
        !            46:
1.1       maekawa    47:   dividend_size = dividend->_mp_size;
                     48:   size = ABS (dividend_size);
                     49:
                     50:   if (quot->_mp_alloc < size)
                     51:     _mpz_realloc (quot, size);
                     52:
                     53:   quot_ptr = quot->_mp_d;
                     54:
                     55:   remainder_limb = mpn_divmod_1 (quot_ptr, dividend->_mp_d, size,
1.1.1.2 ! maekawa    56:                                 (mp_limb_t) divisor);
1.1       maekawa    57:
                     58:   if (remainder_limb != 0 && dividend_size >= 0)
                     59:     {
1.1.1.2 ! maekawa    60:       mpn_incr_u (quot_ptr, (mp_limb_t) 1);
1.1       maekawa    61:       remainder_limb = divisor - remainder_limb;
                     62:     }
                     63:
                     64:   size -= size != 0 && quot_ptr[size - 1] == 0;
                     65:   quot->_mp_size = dividend_size >= 0 ? size : -size;
                     66:
                     67:   rem->_mp_d[0] = remainder_limb;
                     68:   rem->_mp_size = -(remainder_limb != 0);
                     69:
                     70:   return remainder_limb;
                     71: }