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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: mptext-string.c,v 1.5 2004/04/08 01:36:15 mdw Exp $ |
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4 | * |
5 | * Reading and writing large integers on strings |
6 | * |
7 | * (c) 1999 Straylight/Edgeware |
8 | */ |
9 | |
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10 | /*----- Licensing notice --------------------------------------------------* |
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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. |
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18 | * |
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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. |
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23 | * |
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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 | |
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30 | /*----- Header files ------------------------------------------------------*/ |
31 | |
32 | #include <string.h> |
33 | |
34 | #include "mptext.h" |
35 | |
36 | /*----- Main code ---------------------------------------------------------*/ |
37 | |
38 | /* --- Operations table --- */ |
39 | |
40 | static int get(void *p) |
41 | { |
42 | mptext_stringctx *c = p; |
43 | if (c->buf >= c->lim) |
44 | return (EOF); |
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45 | return ((unsigned char)*c->buf++); |
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46 | } |
47 | |
48 | static void unget(int ch, void *p) |
49 | { |
50 | mptext_stringctx *c = p; |
51 | if (ch != EOF) |
52 | c->buf--; |
53 | } |
54 | |
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55 | static int put(const char *s, size_t sz, void *p) |
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56 | { |
57 | mptext_stringctx *c = p; |
58 | int rc = 0; |
59 | if (sz > c->lim - c->buf) { |
60 | sz = c->lim - c->buf; |
61 | rc = EOF; |
62 | } |
63 | if (sz) { |
64 | memcpy(c->buf, s, sz); |
65 | c->buf += sz; |
66 | } |
67 | return (rc); |
68 | } |
69 | |
70 | const mptext_ops mptext_stringops = { get, unget, put }; |
71 | |
72 | /* --- Convenience functions --- */ |
73 | |
74 | mp *mp_readstring(mp *m, const char *p, char **end, int radix) |
75 | { |
76 | mptext_stringctx c; |
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77 | c.buf = (/*unconst */ char *)p; |
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78 | c.lim = c.buf + strlen(p); |
79 | m = mp_read(m, radix, &mptext_stringops, &c); |
80 | if (end) |
81 | *end = c.buf; |
82 | return (m); |
83 | } |
84 | |
85 | int mp_writestring(mp *m, char *p, size_t sz, int radix) |
86 | { |
87 | mptext_stringctx c; |
88 | int rc; |
89 | if (!sz) |
90 | return (0); |
91 | c.buf = p; |
92 | c.lim = p + sz - 1; |
93 | rc = mp_write(m, radix, &mptext_stringops, &c); |
94 | *c.buf = 0; |
95 | return (rc); |
96 | } |
97 | |
98 | /*----- That's all, folks -------------------------------------------------*/ |