d3409d5e |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: mptext-string.c,v 1.1 1999/11/17 18:02:16 mdw Exp $ |
4 | * |
5 | * Reading and writing large integers on strings |
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: mptext-string.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 <string.h> |
41 | |
42 | #include "mptext.h" |
43 | |
44 | /*----- Main code ---------------------------------------------------------*/ |
45 | |
46 | /* --- Operations table --- */ |
47 | |
48 | static int get(void *p) |
49 | { |
50 | mptext_stringctx *c = p; |
51 | if (c->buf >= c->lim) |
52 | return (EOF); |
53 | return (*c->buf++); |
54 | } |
55 | |
56 | static void unget(int ch, void *p) |
57 | { |
58 | mptext_stringctx *c = p; |
59 | if (ch != EOF) |
60 | c->buf--; |
61 | } |
62 | |
63 | static int put(char *s, size_t sz, void *p) |
64 | { |
65 | mptext_stringctx *c = p; |
66 | int rc = 0; |
67 | if (sz > c->lim - c->buf) { |
68 | sz = c->lim - c->buf; |
69 | rc = EOF; |
70 | } |
71 | if (sz) { |
72 | memcpy(c->buf, s, sz); |
73 | c->buf += sz; |
74 | } |
75 | return (rc); |
76 | } |
77 | |
78 | const mptext_ops mptext_stringops = { get, unget, put }; |
79 | |
80 | /* --- Convenience functions --- */ |
81 | |
82 | mp *mp_readstring(mp *m, const char *p, char **end, int radix) |
83 | { |
84 | mptext_stringctx c; |
85 | c.buf = (char *)p; |
86 | c.lim = c.buf + strlen(p); |
87 | m = mp_read(m, radix, &mptext_stringops, &c); |
88 | if (end) |
89 | *end = c.buf; |
90 | return (m); |
91 | } |
92 | |
93 | int mp_writestring(mp *m, char *p, size_t sz, int radix) |
94 | { |
95 | mptext_stringctx c; |
96 | int rc; |
97 | if (!sz) |
98 | return (0); |
99 | c.buf = p; |
100 | c.lim = p + sz - 1; |
101 | rc = mp_write(m, radix, &mptext_stringops, &c); |
102 | *c.buf = 0; |
103 | return (rc); |
104 | } |
105 | |
106 | /*----- That's all, folks -------------------------------------------------*/ |