Annotation of OpenXM_contrib/gmp/mpz/gcd_ui.c, Revision 1.1.1.2
1.1 maekawa 1: /* mpz_gcd_ui -- Calculate the greatest common divisior of two integers.
2:
1.1.1.2 ! maekawa 3: Copyright (C) 1994, 1996, 1999, 2000 Free Software Foundation, Inc.
1.1 maekawa 4:
5: This file is part of the GNU MP Library.
6:
7: The GNU MP Library is free software; you can redistribute it and/or modify
1.1.1.2 ! maekawa 8: it under the terms of the GNU Lesser General Public License as published by
! 9: the Free Software Foundation; either version 2.1 of the License, or (at your
1.1 maekawa 10: option) any later version.
11:
12: The GNU MP Library is distributed in the hope that it will be useful, but
13: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
1.1.1.2 ! maekawa 14: or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
1.1 maekawa 15: License for more details.
16:
1.1.1.2 ! maekawa 17: You should have received a copy of the GNU Lesser General Public License
1.1 maekawa 18: along with the GNU MP Library; see the file COPYING.LIB. If not, write to
19: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
20: MA 02111-1307, USA. */
21:
1.1.1.2 ! maekawa 22: #include <stdio.h> /* for NULL */
1.1 maekawa 23: #include "gmp.h"
24: #include "gmp-impl.h"
25:
26: unsigned long int
27: #if __STDC__
28: mpz_gcd_ui (mpz_ptr w, mpz_srcptr u, unsigned long int v)
29: #else
30: mpz_gcd_ui (w, u, v)
31: mpz_ptr w;
32: mpz_srcptr u;
33: unsigned long int v;
34: #endif
35: {
36: mp_size_t size;
37: mp_limb_t res;
38:
39: size = ABS (u->_mp_size);
40:
41: if (size == 0)
42: res = v;
43: else if (v == 0)
44: {
45: if (w != NULL && u != w)
46: {
47: if (w->_mp_alloc < size)
48: _mpz_realloc (w, size);
49:
50: MPN_COPY (w->_mp_d, u->_mp_d, size);
51: }
52: w->_mp_size = size;
53: /* We can't return any useful result for gcd(big,0). */
54: return size > 1 ? 0 : w->_mp_d[0];
55: }
56: else
1.1.1.2 ! maekawa 57: res = mpn_gcd_1 (u->_mp_d, size, (mp_limb_t) v);
1.1 maekawa 58:
59: if (w != NULL)
60: {
61: w->_mp_d[0] = res;
62: w->_mp_size = 1;
63: }
64: return res;
65: }
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