/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1990 The Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)dev_mkdb.c	5.14 (Berkeley) 03/18/93";
#endif /* not lint */

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

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

void	err __P((const char *, ...));
void	usage __P((void));

int
main(argc, argv)
	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;
	u_char buf[MAXNAMLEN + 1];
	char dbtmp[MAXPATHLEN + 1], dbname[MAXPATHLEN + 1];

	while ((ch = getopt(argc, argv, "")) != EOF)
		switch((char)ch) {
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (argc > 0)
		usage();

	if (chdir(_PATH_DEV))
		err("%s: %s", _PATH_DEV, strerror(errno));

	dirp = opendir(".");

	(void)snprintf(dbtmp, sizeof(dbtmp), "%sdev.tmp", _PATH_VARRUN);
	(void)snprintf(dbname, sizeof(dbtmp), "%sdev.db", _PATH_VARRUN);
	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("%s: %s", dbtmp, strerror(errno));

	/*
	 * 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)) {
			(void)fprintf(stderr,
			    "dev_mkdb: %s: %s\n", dp->d_name, strerror(errno));
			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("dbput %s: %s\n", dbtmp, strerror(errno));
	}
	(void)(db->close)(db);
	if (rename(dbtmp, dbname))
		err("rename %s to %s: %s", dbtmp, dbname, strerror(errno));
	exit(0);
}

void
usage()
{
	(void)fprintf(stderr, "usage: dev_mkdb\n");
	exit(1);
}

#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif

void
#if __STDC__
err(const char *fmt, ...)
#else
err(fmt, va_alist)
	char *fmt;
        va_dcl
#endif
{
	va_list ap;
#if __STDC__
	va_start(ap, fmt);
#else
	va_start(ap);
#endif
	(void)fprintf(stderr, "dev_mkdb: ");
	(void)vfprintf(stderr, fmt, ap);
	va_end(ap);
	(void)fprintf(stderr, "\n");
	exit(1);
	/* NOTREACHED */
}