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/* mpi-cmp.c - MPI functions
* Copyright (C) 1998, 1999 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GnuPG 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "mpi-internal.h"
int mpi_cmp_ui(MPI u, unsigned long v)
{
mpi_limb_t limb = v;
mpi_normalize(u);
if (!u->nlimbs && !limb)
return 0;
if (u->sign)
return -1;
if (u->nlimbs > 1)
return 1;
if (u->d[0] == limb)
return 0;
else if (u->d[0] > limb)
return 1;
else
return -1;
}
EXPORT_SYMBOL_GPL(mpi_cmp_ui);
static int do_mpi_cmp(MPI u, MPI v, int absmode)
{
mpi_size_t usize;
mpi_size_t vsize;
int usign;
int vsign;
int cmp;
mpi_normalize(u);
mpi_normalize(v);
usize = u->nlimbs;
vsize = v->nlimbs;
usign = absmode ? 0 : u->sign;
vsign = absmode ? 0 : v->sign;
/* Compare sign bits. */
if (!usign && vsign)
return 1;
if (usign && !vsign)
return -1;
/* U and V are either both positive or both negative. */
if (usize != vsize && !usign && !vsign)
return usize - vsize;
if (usize != vsize && usign && vsign)
return vsize + usize;
if (!usize)
return 0;
cmp = mpihelp_cmp(u->d, v->d, usize);
if (!cmp)
return 0;
if ((cmp < 0?1:0) == (usign?1:0))
return 1;
return -1;
}
int mpi_cmp(MPI u, MPI v)
{
return do_mpi_cmp(u, v, 0);
}
EXPORT_SYMBOL_GPL(mpi_cmp);
int mpi_cmpabs(MPI u, MPI v)
{
return do_mpi_cmp(u, v, 1);
}
EXPORT_SYMBOL_GPL(mpi_cmpabs);
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