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1 | /* -*-c-*- |
2 | * |
3 | * $Id: mp-misc.c,v 1.1 1999/11/17 18:02:16 mdw Exp $ |
4 | * |
5 | * Miscellaneous multiprecision support functions |
6 | * |
7 | * (c) 1999 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Catacomb. |
13 | * |
14 | * Catacomb is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU Library General Public License as |
16 | * published by the Free Software Foundation; either version 2 of the |
17 | * License, or (at your option) any later version. |
18 | * |
19 | * Catacomb is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU Library General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU Library General Public |
25 | * License along with Catacomb; if not, write to the Free |
26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
27 | * MA 02111-1307, USA. |
28 | */ |
29 | |
30 | /*----- Revision history --------------------------------------------------* |
31 | * |
32 | * $Log: mp-misc.c,v $ |
33 | * Revision 1.1 1999/11/17 18:02:16 mdw |
34 | * New multiprecision integer arithmetic suite. |
35 | * |
36 | */ |
37 | |
38 | /*----- Header files ------------------------------------------------------*/ |
39 | |
40 | #include "mp.h" |
41 | |
42 | /*----- Paranoia management -----------------------------------------------*/ |
43 | |
44 | /* --- @mp_burn@ --- * |
45 | * |
46 | * Arguments: @mp *m@ = pointer to a multiprecision integer |
47 | * |
48 | * Returns: --- |
49 | * |
50 | * Use: Marks the integer as `burn-after-use'. When the integer's |
51 | * memory is deallocated, it is deleted so that traces can't |
52 | * remain in the swap file. In theory. |
53 | */ |
54 | |
55 | void mp_burn(mp *m) |
56 | { |
57 | m->f |= MP_BURN; |
58 | } |
59 | |
60 | /*----- Basic manipulation ------------------------------------------------*/ |
61 | |
62 | /* --- @mp_shrink@ --- * |
63 | * |
64 | * Arguments: @mp *m@ = pointer to a multiprecision integer |
65 | * |
66 | * Returns: --- |
67 | * |
68 | * Use: Reduces the recorded length of an integer. This doesn't |
69 | * reduce the amount of memory used, although it can improve |
70 | * performance a bit. To reduce memory, use @mp_minimize@ |
71 | * instead. This can't change the value of an integer, and is |
72 | * therefore safe to use even when there are multiple |
73 | * references. |
74 | */ |
75 | |
76 | void mp_shrink(mp *m) { MP_SHRINK(m); } |
77 | |
78 | /* --- @mp_minimize@ --- * |
79 | * |
80 | * Arguments: @mp *m@ = pointer to a multiprecision integer |
81 | * |
82 | * Returns: --- |
83 | * |
84 | * Use: Reduces the amount of memory an integer uses. It's best to |
85 | * do this to numbers which aren't going to change in the |
86 | * future. |
87 | */ |
88 | |
89 | void mp_minimize(mp *m) |
90 | { |
91 | MP_SHRINK(m); |
92 | MP_RESIZE(m, MP_LEN(m)); |
93 | } |
94 | |
95 | /*----- Bit scanning ------------------------------------------------------*/ |
96 | |
97 | /* --- @mp_scan@ --- * |
98 | * |
99 | * Arguments: @mpscan *sc@ = pointer to bitscanner block |
100 | * @const mp *m@ = pointer to a multiprecision integer |
101 | * |
102 | * Returns: --- |
103 | * |
104 | * Use: Initializes a bitscanner on a multiprecision integer. |
105 | */ |
106 | |
107 | void mp_scan(mpscan *sc, const mp *m) { MP_SCAN(sc, m); } |
108 | |
109 | /*----- That's all, folks -------------------------------------------------*/ |