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/* mpi-cmp.c - MPI functions
* Copyright (C) 1998, 1999, 2001, 2002 Free Software Foundation, Inc.
*
* This file is part of Libgcrypt.
*
* Libgcrypt 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.
*
* Libgcrypt 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include "mpi-internal.h"
int
gcry_mpi_cmp_ui( gcry_mpi_t u, unsigned long v )
{
mpi_limb_t limb = v;
_gcry_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;
}
int
gcry_mpi_cmp( gcry_mpi_t u, gcry_mpi_t v )
{
mpi_size_t usize, vsize;
int cmp;
_gcry_mpi_normalize( u );
_gcry_mpi_normalize( v );
usize = u->nlimbs;
vsize = v->nlimbs;
if( !u->sign && v->sign )
return 1;
if( u->sign && !v->sign )
return -1;
if( usize != vsize && !u->sign && !v->sign )
return usize - vsize;
if( usize != vsize && u->sign && v->sign )
return vsize + usize;
if( !usize )
return 0;
if( !(cmp = _gcry_mpih_cmp( u->d, v->d, usize )) )
return 0;
if( (cmp < 0?1:0) == (u->sign?1:0))
return 1;
return -1;
}
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