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1 | /* -*-c-*- |
2 | * |
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3 | * Matches regular expressions |
4 | * |
5 | * (c) 2002 Mark Wooding |
6 | */ |
7 | |
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8 | /*----- Licensing notice --------------------------------------------------* |
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9 | * |
10 | * This file is part of Anag: a simple wordgame helper. |
11 | * |
12 | * Anag is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU General Public License as published by |
14 | * the Free Software Foundation; either version 2 of the License, or |
15 | * (at your option) any later version. |
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16 | * |
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17 | * Anag is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
20 | * GNU General Public License for more details. |
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21 | * |
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22 | * You should have received a copy of the GNU General Public License |
23 | * along with Anag; if not, write to the Free Software Foundation, |
24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
25 | */ |
26 | |
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27 | /*----- Header files ------------------------------------------------------*/ |
28 | |
29 | #ifdef HAVE_CONFIG_H |
30 | # include "config.h" |
31 | #endif |
32 | |
33 | #ifndef HAVE_REGCOMP |
34 | extern int dummy; |
35 | #else |
36 | |
37 | #include "anag.h" |
38 | #include <regex.h> |
39 | |
40 | /*----- Data structures ---------------------------------------------------*/ |
41 | |
42 | typedef struct node_regexp { |
43 | node n; |
44 | const char *s; |
45 | regex_t rx; |
46 | } node_regexp; |
47 | |
48 | /*----- Main code ---------------------------------------------------------*/ |
49 | |
50 | /* --- Node matcher --- */ |
51 | |
52 | static int n_regexp(node *nn, const char *p, size_t sz) |
53 | { |
54 | node_regexp *n = (node_regexp *)nn; |
55 | int e; |
56 | |
57 | switch (e = regexec(&n->rx, p, 0, 0, 0)) { |
58 | case 0: |
59 | return 1; |
60 | case REG_NOMATCH: |
61 | return 0; |
62 | default: { |
63 | char buf[256]; |
64 | regerror(e, &n->rx, buf, sizeof(buf)); |
65 | die("error matching regexp `%s' against `%s': %s", |
66 | n->s, p, buf); |
67 | } break; |
68 | } |
69 | return (0); |
70 | } |
71 | |
72 | /* --- Node creation --- */ |
73 | |
74 | node *regexp(const char *const *av) |
75 | { |
76 | node_regexp *n = xmalloc(sizeof(*n)); |
77 | int e; |
78 | n->n.func = n_regexp; |
79 | if ((e = regcomp(&n->rx, av[0], |
80 | REG_EXTENDED | REG_ICASE | REG_NOSUB)) != 0) { |
81 | char buf[256]; |
82 | regerror(e, &n->rx, buf, sizeof(buf)); |
83 | die("bad regular expression `%s': %s", av[0], buf); |
84 | } |
85 | return (&n->n); |
86 | } |
87 | |
88 | /*----- That's all, folks -------------------------------------------------*/ |
89 | |
90 | #endif |