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
23int mpi_cmp_ui(MPI u, unsigned long v)
24{
25	mpi_limb_t limb = v;
26
27	mpi_normalize(u);
28	if (!u->nlimbs && !limb)
29		return 0;
30	if (u->sign)
31		return -1;
32	if (u->nlimbs > 1)
33		return 1;
34
35	if (u->d[0] == limb)
36		return 0;
37	else if (u->d[0] > limb)
38		return 1;
39	else
40		return -1;
41}
42EXPORT_SYMBOL_GPL(mpi_cmp_ui);
43
44int mpi_cmp(MPI u, MPI v)
45{
46	mpi_size_t usize, vsize;
 
 
 
47	int cmp;
48
49	mpi_normalize(u);
50	mpi_normalize(v);
 
51	usize = u->nlimbs;
52	vsize = v->nlimbs;
53	if (!u->sign && v->sign)
 
 
 
 
 
54		return 1;
55	if (u->sign && !v->sign)
56		return -1;
57	if (usize != vsize && !u->sign && !v->sign)
 
 
 
58		return usize - vsize;
59	if (usize != vsize && u->sign && v->sign)
60		return vsize - usize;
61	if (!usize)
62		return 0;
63	cmp = mpihelp_cmp(u->d, v->d, usize);
64	if (u->sign)
65		return -cmp;
66	return cmp;
 
 
 
 
 
 
 
 
67}
68EXPORT_SYMBOL_GPL(mpi_cmp);

 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
23int mpi_cmp_ui(MPI u, unsigned long v)
24{
25	mpi_limb_t limb = v;
26
27	mpi_normalize(u);
28	if (!u->nlimbs && !limb)
29		return 0;
30	if (u->sign)
31		return -1;
32	if (u->nlimbs > 1)
33		return 1;
34
35	if (u->d[0] == limb)
36		return 0;
37	else if (u->d[0] > limb)
38		return 1;
39	else
40		return -1;
41}
42EXPORT_SYMBOL_GPL(mpi_cmp_ui);
43
44static int do_mpi_cmp(MPI u, MPI v, int absmode)
45{
46	mpi_size_t usize;
47	mpi_size_t vsize;
48	int usign;
49	int vsign;
50	int cmp;
51
52	mpi_normalize(u);
53	mpi_normalize(v);
54
55	usize = u->nlimbs;
56	vsize = v->nlimbs;
57	usign = absmode ? 0 : u->sign;
58	vsign = absmode ? 0 : v->sign;
59
60	/* Compare sign bits.  */
61
62	if (!usign && vsign)
63		return 1;
64	if (usign && !vsign)
65		return -1;
66
67	/* U and V are either both positive or both negative.  */
68
69	if (usize != vsize && !usign && !vsign)
70		return usize - vsize;
71	if (usize != vsize && usign && vsign)
72		return vsize + usize;
73	if (!usize)
74		return 0;
75	cmp = mpihelp_cmp(u->d, v->d, usize);
76	if (!cmp)
77		return 0;
78	if ((cmp < 0?1:0) == (usign?1:0))
79		return 1;
80
81	return -1;
82}
83
84int mpi_cmp(MPI u, MPI v)
85{
86	return do_mpi_cmp(u, v, 0);
87}
88EXPORT_SYMBOL_GPL(mpi_cmp);
89
90int mpi_cmpabs(MPI u, MPI v)
91{
92	return do_mpi_cmp(u, v, 1);
93}
94EXPORT_SYMBOL_GPL(mpi_cmpabs);