libc/upstream-netbsd/lib/libc/regex/regfree.c

/*	$NetBSD: regfree.c,v 1.19 2021/02/26 19:24:47 christos Exp $	*/

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1992, 1993, 1994 Henry Spencer.
 * Copyright (c) 1992, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Henry Spencer.
 *
 * 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. 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.
 *
 *	@(#)regfree.c	8.3 (Berkeley) 3/20/94
 */

#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif

#include <sys/cdefs.h>
#if 0
static char sccsid[] = "@(#)regfree.c	8.3 (Berkeley) 3/20/94";
__FBSDID("$FreeBSD: head/lib/libc/regex/regfree.c 326025 2017-11-20 19:49:47Z pfg $");
#endif
__RCSID("$NetBSD: regfree.c,v 1.19 2021/02/26 19:24:47 christos Exp $");

#include "namespace.h"
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <regex.h>

#ifdef __weak_alias
__weak_alias(regfree,_regfree)
#endif

#include "utils.h"
#include "regex2.h"

/*
 - regfree - free everything
 = extern void regfree(regex_t *);
 */
void
regfree(regex_t *preg)
{
	struct re_guts *g;
	unsigned int i;

	_DIAGASSERT(preg != NULL);

	_DIAGASSERT(preg->re_magic == MAGIC1);
	if (preg->re_magic != MAGIC1)	/* oops */
		return;			/* nice to complain, but hard */

	g = preg->re_g;
	if (g == NULL || g->magic != MAGIC2)	/* oops again */
		return;
	preg->re_magic = 0;		/* mark it invalid */
	g->magic = 0;			/* mark it invalid */

	if (g->strip != NULL)
		free(g->strip);
	if (g->sets != NULL) {
		for (i = 0; i < g->ncsets; i++) {
			free(g->sets[i].ranges);
			free(g->sets[i].wides);
			free(g->sets[i].types);
		}
		free(g->sets);
	}
	if (g->must != NULL)
		free(g->must);
	if (g->charjump != NULL)
		free(&g->charjump[CHAR_MIN]);
	if (g->matchjump != NULL)
		free(g->matchjump);
	free(g);
}