1*b30d1939SAndy Fiddaman /***********************************************************************
2*b30d1939SAndy Fiddaman * *
3*b30d1939SAndy Fiddaman * This software is part of the ast package *
4*b30d1939SAndy Fiddaman * Copyright (c) 1985-2011 AT&T Intellectual Property *
5*b30d1939SAndy Fiddaman * and is licensed under the *
6*b30d1939SAndy Fiddaman * Eclipse Public License, Version 1.0 *
7*b30d1939SAndy Fiddaman * by AT&T Intellectual Property *
8*b30d1939SAndy Fiddaman * *
9*b30d1939SAndy Fiddaman * A copy of the License is available at *
10*b30d1939SAndy Fiddaman * http://www.eclipse.org/org/documents/epl-v10.html *
11*b30d1939SAndy Fiddaman * (with md5 checksum b35adb5213ca9657e911e9befb180842) *
12*b30d1939SAndy Fiddaman * *
13*b30d1939SAndy Fiddaman * Information and Software Systems Research *
14*b30d1939SAndy Fiddaman * AT&T Research *
15*b30d1939SAndy Fiddaman * Florham Park NJ *
16*b30d1939SAndy Fiddaman * *
17*b30d1939SAndy Fiddaman * Glenn Fowler <gsf@research.att.com> *
18*b30d1939SAndy Fiddaman * David Korn <dgk@research.att.com> *
19*b30d1939SAndy Fiddaman * Phong Vo <kpv@research.att.com> *
20*b30d1939SAndy Fiddaman * *
21*b30d1939SAndy Fiddaman ***********************************************************************/
22*b30d1939SAndy Fiddaman #pragma prototyped
23*b30d1939SAndy Fiddaman /*
24*b30d1939SAndy Fiddaman * re_comp implementation
25*b30d1939SAndy Fiddaman */
26*b30d1939SAndy Fiddaman
27*b30d1939SAndy Fiddaman #include <ast.h>
28*b30d1939SAndy Fiddaman #include <re_comp.h>
29*b30d1939SAndy Fiddaman #include <regex.h>
30*b30d1939SAndy Fiddaman
31*b30d1939SAndy Fiddaman #undef error
32*b30d1939SAndy Fiddaman #undef valid
33*b30d1939SAndy Fiddaman
34*b30d1939SAndy Fiddaman static struct
35*b30d1939SAndy Fiddaman {
36*b30d1939SAndy Fiddaman char error[64];
37*b30d1939SAndy Fiddaman regex_t re;
38*b30d1939SAndy Fiddaman int valid;
39*b30d1939SAndy Fiddaman } state;
40*b30d1939SAndy Fiddaman
41*b30d1939SAndy Fiddaman char*
re_comp(const char * pattern)42*b30d1939SAndy Fiddaman re_comp(const char* pattern)
43*b30d1939SAndy Fiddaman {
44*b30d1939SAndy Fiddaman register int r;
45*b30d1939SAndy Fiddaman
46*b30d1939SAndy Fiddaman if (!pattern || !*pattern)
47*b30d1939SAndy Fiddaman {
48*b30d1939SAndy Fiddaman if (state.valid)
49*b30d1939SAndy Fiddaman return 0;
50*b30d1939SAndy Fiddaman r = REG_BADPAT;
51*b30d1939SAndy Fiddaman }
52*b30d1939SAndy Fiddaman else
53*b30d1939SAndy Fiddaman {
54*b30d1939SAndy Fiddaman if (state.valid)
55*b30d1939SAndy Fiddaman {
56*b30d1939SAndy Fiddaman state.valid = 0;
57*b30d1939SAndy Fiddaman regfree(&state.re);
58*b30d1939SAndy Fiddaman }
59*b30d1939SAndy Fiddaman if (!(r = regcomp(&state.re, pattern, REG_LENIENT|REG_NOSUB|REG_NULL)))
60*b30d1939SAndy Fiddaman {
61*b30d1939SAndy Fiddaman state.valid = 1;
62*b30d1939SAndy Fiddaman return 0;
63*b30d1939SAndy Fiddaman }
64*b30d1939SAndy Fiddaman }
65*b30d1939SAndy Fiddaman regerror(r, &state.re, state.error, sizeof(state.error));
66*b30d1939SAndy Fiddaman return state.error;
67*b30d1939SAndy Fiddaman }
68*b30d1939SAndy Fiddaman
69*b30d1939SAndy Fiddaman int
re_exec(const char * subject)70*b30d1939SAndy Fiddaman re_exec(const char* subject)
71*b30d1939SAndy Fiddaman {
72*b30d1939SAndy Fiddaman if (state.valid && subject)
73*b30d1939SAndy Fiddaman switch (regexec(&state.re, subject, 0, NiL, 0))
74*b30d1939SAndy Fiddaman {
75*b30d1939SAndy Fiddaman case 0:
76*b30d1939SAndy Fiddaman return 1;
77*b30d1939SAndy Fiddaman case REG_NOMATCH:
78*b30d1939SAndy Fiddaman return 0;
79*b30d1939SAndy Fiddaman }
80*b30d1939SAndy Fiddaman return -1;
81*b30d1939SAndy Fiddaman }
82