1 /* mpi-cmp.c - MPI functions
2 * Copyright (C) 1998, 1999 Free Software Foundation, Inc.
3 *
4 * This file is part of GnuPG.
5 *
6 * GnuPG is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * GnuPG is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
19 */
20
21 #include "mpi-internal.h"
22
mpi_cmp_ui(MPI u,unsigned long v)23 int mpi_cmp_ui(MPI u, unsigned long v)
24 {
25 mpi_limb_t limb = v;
26
27 mpi_normalize(u);
28 if (u->nlimbs == 0) {
29 if (v == 0)
30 return 0;
31 else
32 return -1;
33 }
34 if (u->sign)
35 return -1;
36 if (u->nlimbs > 1)
37 return 1;
38
39 if (u->d[0] == limb)
40 return 0;
41 else if (u->d[0] > limb)
42 return 1;
43 else
44 return -1;
45 }
46 EXPORT_SYMBOL_GPL(mpi_cmp_ui);
47
mpi_cmp(MPI u,MPI v)48 int mpi_cmp(MPI u, MPI v)
49 {
50 mpi_size_t usize, vsize;
51 int cmp;
52
53 mpi_normalize(u);
54 mpi_normalize(v);
55 usize = u->nlimbs;
56 vsize = v->nlimbs;
57 if (!u->sign && v->sign)
58 return 1;
59 if (u->sign && !v->sign)
60 return -1;
61 if (usize != vsize && !u->sign && !v->sign)
62 return usize - vsize;
63 if (usize != vsize && u->sign && v->sign)
64 return vsize - usize;
65 if (!usize)
66 return 0;
67 cmp = mpihelp_cmp(u->d, v->d, usize);
68 if (u->sign)
69 return -cmp;
70 return cmp;
71 }
72 EXPORT_SYMBOL_GPL(mpi_cmp);
73