NetBSD/lib/libcompat/4.3/regex.c

/*-
 * Copyright (c) 1992 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * James da Silva at the University of Maryland at College Park.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Compatibility routines that implement the old re_comp/re_exec interface in
 * terms of the regcomp/regexec interface.  It's possible that some programs
 * rely on dark corners of re_comp/re_exec and won't work with this version,
 * but most programs should be fine.
 */

#if defined(LIBC_SCCS) && !defined(lint)
/*static char sccsid[] = "from: @(#)regex.c	5.1 (Berkeley) 3/29/92";*/
static char rcsid[] = "$Id: regex.c,v 1.3 1993/11/11 01:24:50 jtc Exp $";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <regex.h>

static int compiled_regexp = 0;
static char errbuf[256];
static regex_t rp;

char *
re_comp(s)
	char *s;
{
	int eval;

	if (s == NULL)
		return (NULL);

	if (compiled_regexp) {
		regfree(&rp);
		compiled_regexp = 0;
	}

	if ((eval = regcomp(&rp, s, REG_NOSUB)) != 0) {
		regerror (eval, &rp, errbuf, sizeof(errbuf));
		return errbuf;
	}

	compiled_regexp = 1;
	return NULL;
}

int
re_exec(s)
	char *s;
{
	regmatch_t rm[1];
	int eval;

	if ((eval = regexec(&rp, s, 0, rm, 0)) == 0)
		return 1;

	return eval == REG_NOMATCH ? 0 : -1;
}