re_comp.c revision 2764 
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 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37/*
38 * Compatibility routines that implement the old re_comp/re_exec interface in
39 * terms of the regcomp/regexec interface.  It's possible that some programs
40 * rely on dark corners of re_comp/re_exec and won't work with this version,
41 * but most programs should be fine.
42 */
43
44#if defined(LIBC_SCCS) && !defined(lint)
45static char sccsid[] = "@(#)regex.c	5.1 (Berkeley) 3/29/92";
46#endif /* LIBC_SCCS and not lint */
47
48#include <sys/types.h>
49#include <stddef.h>
50#include <regexp.h>
51#include <string.h>
52#include <stdlib.h>
53
54static regexp *re_regexp;
55static int re_goterr;
56static char *re_errstr;
57
58char *
59re_comp(s)
60	char *s;
61{
62	if (s == NULL || *s == '\0')
63		return (NULL);
64	if (re_regexp)
65		free(re_regexp);
66	if (re_errstr)
67		free(re_errstr);
68	re_goterr = 0;
69	re_regexp = regcomp(s);
70	return (re_goterr ? re_errstr : NULL);
71}
72
73int
74re_exec(s)
75	char *s;
76{
77	int rc;
78
79	re_goterr = 0;
80	rc = regexec(re_regexp, s);
81	return (re_goterr ? -1 : rc);
82}
83
84void
85regerror(s)
86	const char *s;
87{
88	re_goterr = 1;
89	if (re_errstr)
90		free(re_errstr);
91	re_errstr = strdup(s);
92}
93