Annotation of OpenXM_contrib/gmp/mpz/fdiv_qr_ui.c, Revision 1.1.1.2
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:
1.1.1.2 ! maekawa 4: Copyright (C) 1994, 1995, 1996, 1999 Free Software Foundation, 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: 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:
1.1.1.2 ! maekawa 42: if (divisor == 0)
! 43: DIVIDE_BY_ZERO;
! 44:
1.1 maekawa 45: dividend_size = dividend->_mp_size;
46: size = ABS (dividend_size);
47:
48: if (quot->_mp_alloc < size)
49: _mpz_realloc (quot, size);
50:
51: quot_ptr = quot->_mp_d;
52:
53: remainder_limb = mpn_divmod_1 (quot_ptr, dividend->_mp_d, size,
1.1.1.2 ! maekawa 54: (mp_limb_t) divisor);
1.1 maekawa 55:
56: if (remainder_limb != 0 && dividend_size < 0)
57: {
1.1.1.2 ! maekawa 58: mpn_incr_u (quot_ptr, (mp_limb_t) 1);
1.1 maekawa 59: remainder_limb = divisor - remainder_limb;
60: }
61:
62: size -= size != 0 && quot_ptr[size - 1] == 0;
63: quot->_mp_size = dividend_size >= 0 ? size : -size;
64:
65: rem->_mp_d[0] = remainder_limb;
66: rem->_mp_size = remainder_limb != 0;
67:
68: return remainder_limb;
69: }
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