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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: mptext-string.c,v 1.3 2000/08/04 23:23:44 mdw Exp $ |
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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 $ |
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33 | * Revision 1.3 2000/08/04 23:23:44 mdw |
34 | * Various <ctype.h> fixes. |
35 | * |
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36 | * Revision 1.2 1999/12/22 15:56:21 mdw |
37 | * Make the buffer passed to `put' op constant. |
38 | * |
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39 | * Revision 1.1 1999/11/17 18:02:16 mdw |
40 | * New multiprecision integer arithmetic suite. |
41 | * |
42 | */ |
43 | |
44 | /*----- Header files ------------------------------------------------------*/ |
45 | |
46 | #include <string.h> |
47 | |
48 | #include "mptext.h" |
49 | |
50 | /*----- Main code ---------------------------------------------------------*/ |
51 | |
52 | /* --- Operations table --- */ |
53 | |
54 | static int get(void *p) |
55 | { |
56 | mptext_stringctx *c = p; |
57 | if (c->buf >= c->lim) |
58 | return (EOF); |
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59 | return ((unsigned char)*c->buf++); |
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60 | } |
61 | |
62 | static void unget(int ch, void *p) |
63 | { |
64 | mptext_stringctx *c = p; |
65 | if (ch != EOF) |
66 | c->buf--; |
67 | } |
68 | |
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69 | static int put(const char *s, size_t sz, void *p) |
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70 | { |
71 | mptext_stringctx *c = p; |
72 | int rc = 0; |
73 | if (sz > c->lim - c->buf) { |
74 | sz = c->lim - c->buf; |
75 | rc = EOF; |
76 | } |
77 | if (sz) { |
78 | memcpy(c->buf, s, sz); |
79 | c->buf += sz; |
80 | } |
81 | return (rc); |
82 | } |
83 | |
84 | const mptext_ops mptext_stringops = { get, unget, put }; |
85 | |
86 | /* --- Convenience functions --- */ |
87 | |
88 | mp *mp_readstring(mp *m, const char *p, char **end, int radix) |
89 | { |
90 | mptext_stringctx c; |
91 | c.buf = (char *)p; |
92 | c.lim = c.buf + strlen(p); |
93 | m = mp_read(m, radix, &mptext_stringops, &c); |
94 | if (end) |
95 | *end = c.buf; |
96 | return (m); |
97 | } |
98 | |
99 | int mp_writestring(mp *m, char *p, size_t sz, int radix) |
100 | { |
101 | mptext_stringctx c; |
102 | int rc; |
103 | if (!sz) |
104 | return (0); |
105 | c.buf = p; |
106 | c.lim = p + sz - 1; |
107 | rc = mp_write(m, radix, &mptext_stringops, &c); |
108 | *c.buf = 0; |
109 | return (rc); |
110 | } |
111 | |
112 | /*----- That's all, folks -------------------------------------------------*/ |