/*
 * Copyright 2000 Massachusetts Institute of Technology
 *
 * Permission to use, copy, modify, and distribute this software and
 * its documentation for any purpose and without fee is hereby
 * granted, provided that both the above copyright notice and this
 * permission notice appear in all copies, that both the above
 * copyright notice and this permission notice appear in all
 * supporting documentation, and that the name of M.I.T. not be used
 * in advertising or publicity pertaining to distribution of the
 * software without specific, written prior permission.  M.I.T. makes
 * no representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied
 * warranty.
 * 
 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
 * SHALL M.I.T. 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.
 *
 * $FreeBSD: src/usr.sbin/mtree/excludes.c,v 1.1.2.4 2001/01/12 19:17:18 phk Exp $
 * $DragonFly: src/usr.sbin/mtree/excludes.c,v 1.3 2004/03/15 16:24:22 dillon Exp $
 */

#include <sys/types.h>
#include <sys/time.h>		/* XXX for mtree.h */
#include <sys/queue.h>

#include <err.h>
#include <fnmatch.h>
#include <fts.h>
#include <stdio.h>
#include <stdlib.h>

#include "mtree.h"		/* XXX for extern.h */
#include "extern.h"

/*
 * We're assuming that there won't be a whole lot of excludes, 
 * so it's OK to use a stupid algorithm.
 */
struct exclude {
	LIST_ENTRY(exclude) link;
	const char *glob;
	int pathname;
};
static LIST_HEAD(, exclude) excludes;

void
init_excludes(void)
{

	LIST_INIT(&excludes);
}

void
read_excludes_file(const char *name)
{
	FILE *fp;
	char *line, *str;
	struct exclude *e;
	size_t len;

	fp = fopen(name, "r");
	if (fp == 0)
		err(1, "%s", name);

	while ((line = fgetln(fp, &len)) != 0) {
		if (line[len - 1] == '\n')
			len--;
		if (len == 0)
			continue;

		str = malloc(len + 1);
		e = malloc(sizeof *e);
		if (str == 0 || e == 0)
			errx(1, "memory allocation error");
		e->glob = str;
		memcpy(str, line, len);
		str[len] = '\0';
		if (strchr(str, '/'))
			e->pathname = 1;
		else
			e->pathname = 0;
		LIST_INSERT_HEAD(&excludes, e, link);
	}
	fclose(fp);
}

int
check_excludes(const char *fname, const char *path)
{
	struct exclude *e;

	/* fnmatch(3) has a funny return value convention... */
#define MATCH(g, n) (fnmatch((g), (n), FNM_PATHNAME) == 0)

	LIST_FOREACH(e, &excludes, link) {
		if ((e->pathname && MATCH(e->glob, path)) ||
		    MATCH(e->glob, fname))
			return 1;
	}
	return 0;
}