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73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
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/* mpi-cmp.c - MPI functions
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* Copyright (c) 1997 by Werner Koch (dd9jn)
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*
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* This file is part of G10.
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*
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* G10 is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* G10 is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "mpi-internal.h"
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int
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mpi_cmp_ui( MPI u, unsigned long v )
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{
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mpi_limb_t limb = v;
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if( !u->nlimbs && !limb )
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return 0;
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if( u->sign )
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return -1;
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if( u->nlimbs > 1 )
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return 1;
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if( u->d[0] == limb )
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return 0;
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else if( u->d[0] > limb )
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return 1;
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else
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return -1;
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}
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int
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mpi_cmp( MPI u, MPI v )
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{
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mpi_size_t usize = u->nlimbs;
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mpi_size_t vsize = v->nlimbs;
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int cmp;
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/* FIXME: are the numbers always normalized? */
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if( !u->sign && v->sign )
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return 1;
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else if( u->sign && !v->sign )
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return -1;
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else if( usize != vsize && !u->sign && !v->sign )
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return usize - vsize;
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else if( usize != vsize && u->sign && v->sign )
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return vsize + usize;
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else if( !usize )
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return 0;
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else if( !(cmp=mpihelp_cmp( u->d, v->d, usize )) )
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return 0;
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else if( (cmp < 0?1:0) == (u->sign?1:0))
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return 1;
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else
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return -1;
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}
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