mirror of https://github.com/macssh/macssh.git
66 lines
1.7 KiB
C
Executable File
66 lines
1.7 KiB
C
Executable File
/* mpz_gcd_ui -- Calculate the greatest common divisior of two integers.
|
|
|
|
Copyright (C) 1994, 1996, 1999, 2000 Free Software Foundation, Inc.
|
|
|
|
This file is part of the GNU MP Library.
|
|
|
|
The GNU MP Library is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or (at your
|
|
option) any later version.
|
|
|
|
The GNU MP Library is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
|
|
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
|
|
License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with the GNU MP Library; see the file COPYING.LIB. If not, write to
|
|
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
|
|
MA 02111-1307, USA. */
|
|
|
|
#include <stdio.h> /* for NULL */
|
|
#include "gmp.h"
|
|
#include "gmp-impl.h"
|
|
|
|
unsigned long int
|
|
#if __STDC__
|
|
mpz_gcd_ui (mpz_ptr w, mpz_srcptr u, unsigned long int v)
|
|
#else
|
|
mpz_gcd_ui (w, u, v)
|
|
mpz_ptr w;
|
|
mpz_srcptr u;
|
|
unsigned long int v;
|
|
#endif
|
|
{
|
|
mp_size_t size;
|
|
mp_limb_t res;
|
|
|
|
size = ABS (u->_mp_size);
|
|
|
|
if (size == 0)
|
|
res = v;
|
|
else if (v == 0)
|
|
{
|
|
if (w != NULL && u != w)
|
|
{
|
|
if (w->_mp_alloc < size)
|
|
_mpz_realloc (w, size);
|
|
|
|
MPN_COPY (w->_mp_d, u->_mp_d, size);
|
|
}
|
|
w->_mp_size = size;
|
|
/* We can't return any useful result for gcd(big,0). */
|
|
return size > 1 ? 0 : w->_mp_d[0];
|
|
}
|
|
else
|
|
res = mpn_gcd_1 (u->_mp_d, size, (mp_limb_t) v);
|
|
|
|
if (w != NULL)
|
|
{
|
|
w->_mp_d[0] = res;
|
|
w->_mp_size = 1;
|
|
}
|
|
return res;
|
|
}
|