1/*-
2 * Copyright (c) 1992 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * James da Silva at the University of Maryland at College Park.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD$");
35
36/*
37 * Compatibility routines that implement the old re_comp/re_exec interface in
38 * terms of the regcomp/regexec interface.  It's possible that some programs
39 * rely on dark corners of re_comp/re_exec and won't work with this version,
40 * but most programs should be fine.
41 */
42
43#if defined(LIBC_SCCS) && !defined(lint)
44static char sccsid[] = "@(#)regex.c	5.1 (Berkeley) 3/29/92";
45#endif /* LIBC_SCCS and not lint */
46
47#include <regex.h>
48#include <stddef.h>
49#include <unistd.h>
50
51static regex_t re_regexp;
52static int re_gotexp;
53static char re_errstr[100];
54
55char *
56re_comp(const char *s)
57{
58	int rc;
59
60	if (s == NULL || *s == '\0') {
61		if (!re_gotexp)
62			return __DECONST(char *,
63			    "no previous regular expression");
64		return (NULL);
65	}
66
67	if (re_gotexp) {
68		regfree(&re_regexp);
69		re_gotexp = 0;
70	}
71
72	rc = regcomp(&re_regexp, s, REG_EXTENDED);
73	if (rc == 0) {
74		re_gotexp = 1;
75		return (NULL);
76	}
77
78	regerror(rc, &re_regexp, re_errstr, sizeof(re_errstr));
79	re_errstr[sizeof(re_errstr) - 1] = '\0';
80	return (re_errstr);
81}
82
83int
84re_exec(const char *s)
85{
86	int rc;
87
88	if (!re_gotexp)
89		return (-1);
90	rc = regexec(&re_regexp, s, 0, NULL, 0);
91	return (rc == 0 ? 1 : 0);
92}
93