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Annotation of OpenXM_contrib/gmp/mpz/fdiv_qr_ui.c, Revision 1.1.1.1

1.1       maekawa     1: /* mpz_fdiv_qr_ui -- Division rounding the quotient towards -infinity.
                      2:    The remainder gets the same sign as the denominator.
                      3:
                      4: Copyright (C) 1994, 1995, 1996 Free Software Foundation, Inc.
                      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
                      9: it under the terms of the GNU Library General Public License as published by
                     10: the Free Software Foundation; either version 2 of the License, or (at your
                     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
                     15: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
                     16: License for more details.
                     17:
                     18: You should have received a copy of the GNU Library General Public License
                     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: unsigned long int
                     27: #if __STDC__
                     28: mpz_fdiv_qr_ui (mpz_ptr quot, mpz_ptr rem, mpz_srcptr dividend, unsigned long int divisor)
                     29: #else
                     30: mpz_fdiv_qr_ui (quot, rem, dividend, divisor)
                     31:      mpz_ptr quot;
                     32:      mpz_ptr rem;
                     33:      mpz_srcptr dividend;
                     34:      unsigned long int divisor;
                     35: #endif
                     36: {
                     37:   mp_size_t dividend_size;
                     38:   mp_size_t size;
                     39:   mp_ptr quot_ptr;
                     40:   mp_limb_t remainder_limb;
                     41:
                     42:   dividend_size = dividend->_mp_size;
                     43:   size = ABS (dividend_size);
                     44:
                     45:   if (quot->_mp_alloc < size)
                     46:     _mpz_realloc (quot, size);
                     47:
                     48:   quot_ptr = quot->_mp_d;
                     49:
                     50:   remainder_limb = mpn_divmod_1 (quot_ptr, dividend->_mp_d, size,
                     51:                                   (mp_limb_t) divisor);
                     52:
                     53:   if (remainder_limb != 0 && dividend_size < 0)
                     54:     {
                     55:       mpn_add_1 (quot_ptr, quot_ptr, size, (mp_limb_t) 1);
                     56:       remainder_limb = divisor - remainder_limb;
                     57:     }
                     58:
                     59:   size -= size != 0 && quot_ptr[size - 1] == 0;
                     60:   quot->_mp_size = dividend_size >= 0 ? size : -size;
                     61:
                     62:   rem->_mp_d[0] = remainder_limb;
                     63:   rem->_mp_size = remainder_limb != 0;
                     64:
                     65:   return remainder_limb;
                     66: }