Annotation of OpenXM_contrib/gmp/mpz/cdiv_q_ui.c, Revision 1.1.1.2
1.1 maekawa 1: /* mpz_cdiv_q_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, 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_q_ui (mpz_ptr quot, mpz_srcptr dividend, unsigned long int divisor)
31: #else
32: mpz_cdiv_q_ui (quot, dividend, divisor)
33: mpz_ptr quot;
34: mpz_srcptr dividend;
35: unsigned long int divisor;
36: #endif
37: {
38: mp_size_t dividend_size;
39: mp_size_t size;
40: mp_ptr quot_ptr;
41: mp_limb_t remainder_limb;
42:
1.1.1.2 ! maekawa 43: if (divisor == 0)
! 44: DIVIDE_BY_ZERO;
! 45:
1.1 maekawa 46: dividend_size = dividend->_mp_size;
47: size = ABS (dividend_size);
48:
49: if (quot->_mp_alloc < size)
50: _mpz_realloc (quot, size);
51:
52: quot_ptr = quot->_mp_d;
53:
54: remainder_limb = mpn_divmod_1 (quot_ptr, dividend->_mp_d, size,
55: (mp_limb_t) divisor);
56:
57: if (remainder_limb != 0 && dividend_size >= 0)
58: {
1.1.1.2 ! maekawa 59: mpn_incr_u (quot_ptr, (mp_limb_t) 1);
1.1 maekawa 60: remainder_limb = divisor - remainder_limb;
61: }
62:
63: size -= size != 0 && quot_ptr[size - 1] == 0;
64: quot->_mp_size = dividend_size >= 0 ? size : -size;
65:
66: return remainder_limb;
67: }
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