a10122de |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: regexp.c,v 1.1 2002/08/11 12:58:09 mdw Exp $ |
4 | * |
5 | * Matches regular expressions |
6 | * |
7 | * (c) 2002 Mark Wooding |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of Anag: a simple wordgame helper. |
13 | * |
14 | * Anag is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * Anag 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 General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
25 | * along with Anag; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: regexp.c,v $ |
32 | * Revision 1.1 2002/08/11 12:58:09 mdw |
33 | * Added support for regular expression matching, if supported by the C |
34 | * library. |
35 | * |
36 | * Revision 1.1 2001/02/04 17:14:42 mdw |
37 | * Initial checkin |
38 | * |
39 | */ |
40 | |
41 | /*----- Header files ------------------------------------------------------*/ |
42 | |
43 | #ifdef HAVE_CONFIG_H |
44 | # include "config.h" |
45 | #endif |
46 | |
47 | #ifndef HAVE_REGCOMP |
48 | extern int dummy; |
49 | #else |
50 | |
51 | #include "anag.h" |
52 | #include <regex.h> |
53 | |
54 | /*----- Data structures ---------------------------------------------------*/ |
55 | |
56 | typedef struct node_regexp { |
57 | node n; |
58 | const char *s; |
59 | regex_t rx; |
60 | } node_regexp; |
61 | |
62 | /*----- Main code ---------------------------------------------------------*/ |
63 | |
64 | /* --- Node matcher --- */ |
65 | |
66 | static int n_regexp(node *nn, const char *p, size_t sz) |
67 | { |
68 | node_regexp *n = (node_regexp *)nn; |
69 | int e; |
70 | |
71 | switch (e = regexec(&n->rx, p, 0, 0, 0)) { |
72 | case 0: |
73 | return 1; |
74 | case REG_NOMATCH: |
75 | return 0; |
76 | default: { |
77 | char buf[256]; |
78 | regerror(e, &n->rx, buf, sizeof(buf)); |
79 | die("error matching regexp `%s' against `%s': %s", |
80 | n->s, p, buf); |
81 | } break; |
82 | } |
83 | return (0); |
84 | } |
85 | |
86 | /* --- Node creation --- */ |
87 | |
88 | node *regexp(const char *const *av) |
89 | { |
90 | node_regexp *n = xmalloc(sizeof(*n)); |
91 | int e; |
92 | n->n.func = n_regexp; |
93 | if ((e = regcomp(&n->rx, av[0], |
94 | REG_EXTENDED | REG_ICASE | REG_NOSUB)) != 0) { |
95 | char buf[256]; |
96 | regerror(e, &n->rx, buf, sizeof(buf)); |
97 | die("bad regular expression `%s': %s", av[0], buf); |
98 | } |
99 | return (&n->n); |
100 | } |
101 | |
102 | /*----- That's all, folks -------------------------------------------------*/ |
103 | |
104 | #endif |