1 /***********************************************************************
2 * *
3 * This software is part of the ast package *
4 * Copyright (c) 1985-2010 AT&T Intellectual Property *
5 * and is licensed under the *
6 * Common Public License, Version 1.0 *
7 * by AT&T Intellectual Property *
8 * *
9 * A copy of the License is available at *
10 * http://www.opensource.org/licenses/cpl1.0.txt *
11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
12 * *
13 * Information and Software Systems Research *
14 * AT&T Research *
15 * Florham Park NJ *
16 * *
17 * Glenn Fowler <gsf@research.att.com> *
18 * David Korn <dgk@research.att.com> *
19 * Phong Vo <kpv@research.att.com> *
20 * *
21 ***********************************************************************/
22 #pragma prototyped
23 /*
24 * re_comp implementation
25 */
26
27 #include <ast.h>
28 #include <re_comp.h>
29 #include <regex.h>
30
31 #undef error
32 #undef valid
33
34 static struct
35 {
36 char error[64];
37 regex_t re;
38 int valid;
39 } state;
40
41 char*
re_comp(const char * pattern)42 re_comp(const char* pattern)
43 {
44 register int r;
45
46 if (!pattern || !*pattern)
47 {
48 if (state.valid)
49 return 0;
50 r = REG_BADPAT;
51 }
52 else
53 {
54 if (state.valid)
55 {
56 state.valid = 0;
57 regfree(&state.re);
58 }
59 if (!(r = regcomp(&state.re, pattern, REG_LENIENT|REG_NOSUB|REG_NULL)))
60 {
61 state.valid = 1;
62 return 0;
63 }
64 }
65 regerror(r, &state.re, state.error, sizeof(state.error));
66 return state.error;
67 }
68
69 int
re_exec(const char * subject)70 re_exec(const char* subject)
71 {
72 if (state.valid && subject)
73 switch (regexec(&state.re, subject, 0, NiL, 0))
74 {
75 case 0:
76 return 1;
77 case REG_NOMATCH:
78 return 0;
79 }
80 return -1;
81 }
82