/*      $NetBSD: excludes.c,v 1.13 2004/06/20 22:20:18 jmc Exp $        */

/*
 * 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.
 */

#include <sys/types.h>
#include <sys/queue.h>

#include <fnmatch.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <util.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;
        struct exclude *e;

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

        while ((line = fparseln(fp, NULL, NULL, NULL,
            FPARSELN_UNESCCOMM | FPARSELN_UNESCCONT | FPARSELN_UNESCESC))
            != NULL) {
                if (line[0] == '\0')
                        continue;

                if ((e = malloc(sizeof *e)) == NULL)
                        mtree_err("memory allocation error");

                e->glob = line;
                if (strchr(e->glob, '/') != NULL)
                        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)

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