/*-
 * Copyright (c) 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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.
 *
 * @(#) Copyright (c) 1990, 1993 The Regents of the University of California.  All rights reserved.
 * @(#)dev_mkdb.c	8.1 (Berkeley) 6/6/93
 * $FreeBSD: src/usr.sbin/dev_mkdb/dev_mkdb.c,v 1.4.2.1 2001/11/25 18:34:09 iedowse Exp $
 * $DragonFly: src/usr.sbin/dev_mkdb/dev_mkdb.c,v 1.4 2003/11/16 14:10:45 eirikn Exp $
 */

#include <sys/param.h>
#include <sys/stat.h>

#include <db.h>
#include <dirent.h>
#include <err.h>
#include <fcntl.h>
#include <kvm.h>
#include <nlist.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

static void	usage(void);

int
main(int argc, char **argv)
{
	register DIR *dirp;
	register struct dirent *dp;
	struct stat sb;
	struct {
		mode_t type;
		dev_t dev;
	} bkey;
	DB *db;
	DBT data, key;
	int ch, fflag;
	u_char buf[MAXNAMLEN + 1];
	char dbtmp[MAXPATHLEN + 1], dbname[MAXPATHLEN + 1];
	const char *dirname;

	fflag = 0;
	while ((ch = getopt(argc, argv, "f:")) != -1)
		switch((char)ch) {
		case 'f':
			strlcpy(dbname, optarg, sizeof(dbname));
			fflag = 1;
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (argc > 1)
		usage();
	if (argc == 1)
		dirname = argv[0];
	else
		dirname = _PATH_DEV;

	if (!fflag) {
		(void)snprintf(dbname, sizeof(dbtmp), "%sdev.db", _PATH_VARRUN);
		(void)snprintf(dbtmp, sizeof(dbtmp), "%sdev.tmp", _PATH_VARRUN);
	} else
		(void)snprintf(dbtmp, sizeof(dbtmp), "%s.tmp", dbname);

	if (chdir(dirname))
		err(1, "%s", dirname);

	dirp = opendir(".");

	db = dbopen(dbtmp, O_CREAT|O_EXLOCK|O_RDWR|O_TRUNC,
	    S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH, DB_HASH, NULL);
	if (db == NULL)
		err(1, "%s", dbtmp);

	/*
	 * Keys are a mode_t followed by a dev_t.  The former is the type of
	 * the file (mode & S_IFMT), the latter is the st_rdev field.  Note
	 * that the structure may contain padding, so we have to clear it
	 * out here.
	 */
	bzero(&bkey, sizeof(bkey));
	key.data = &bkey;
	key.size = sizeof(bkey);
	data.data = buf;
	while ((dp = readdir(dirp))) {
		if (lstat(dp->d_name, &sb)) {
			warn("%s", dp->d_name);
			continue;
		}

		/* Create the key. */
		if (S_ISCHR(sb.st_mode))
			bkey.type = S_IFCHR;
		else if (S_ISBLK(sb.st_mode))
			bkey.type = S_IFBLK;
		else
			continue;
		bkey.dev = sb.st_rdev;

		/*
		 * Create the data; nul terminate the name so caller doesn't
		 * have to.
		 */
		bcopy(dp->d_name, buf, dp->d_namlen);
		buf[dp->d_namlen] = '\0';
		data.size = dp->d_namlen + 1;
		if ((db->put)(db, &key, &data, 0))
			err(1, "dbput %s", dbtmp);
	}
	(void)(db->close)(db);
	if (rename(dbtmp, dbname))
		err(1, "rename %s to %s", dbtmp, dbname);
	exit(0);
}

static void
usage(void)
{
	(void)fprintf(stderr, "usage: dev_mkdb [-f file] [directory]\n");
	exit(1);
}