/*-
 * 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	5.2 (Berkeley) 02/14/91";
#endif /* not lint */

#include <sys/param.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dirent.h>
#include <ndbm.h>
#include <kvm.h>
#include <errno.h>
#include <stdio.h>
#include <paths.h>
#include <string.h>

main(argc, argv)
	int argc;
	char **argv;
{
	extern int optind;
	register DIR *dirp;
	register struct dirent *dp;
	struct stat sb;
	DBM *db;
	datum key, data;
	int ch;
	char buf[MAXNAMLEN + 1], dbtmp[MAXPATHLEN + 1], dbname[MAXPATHLEN + 1];

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

	if (chdir(_PATH_DEV))
		error(_PATH_DEV);

	dirp = opendir(".");

	(void)sprintf(dbtmp, "%s/dev.tmp", _PATH_VARRUN);
	(void)sprintf(dbname, "%s/dev.db", _PATH_VARRUN);
	if ((db = dbm_open(dbtmp, O_CREAT|O_WRONLY|O_EXCL,
	    S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)) == NULL)
		error(dbtmp);

	key.dptr = (char *)&sb.st_rdev;
	key.dsize = sizeof(sb.st_rdev);
	data.dptr = buf;
	while (dp = readdir(dirp)) {
		if (stat(dp->d_name, &sb))
			error(dp->d_name);
		if (!S_ISCHR(sb.st_mode))
			continue;

		/* Nul terminate the name so ps doesn't have to. */
		bcopy(dp->d_name, buf, dp->d_namlen);
		buf[dp->d_namlen] = '\0';
		data.dsize = dp->d_namlen + 1;
		if (dbm_store(db, key, data, DBM_INSERT) < 0)
			error("dbm_store");
	}
	(void)dbm_close(db);
	(void)strcat(dbtmp, DBM_SUFFIX);
	if (rename(dbtmp, dbname)) {
		(void)fprintf(stderr, "dev_mkdb: %s to %s: %s.\n",
		    dbtmp, dbname, strerror(errno));
		exit(1);
	}
	exit(0);
}

error(n)
	char *n;
{
	(void)fprintf(stderr, "kvm_mkdb: %s: %s\n", n, strerror(errno));
	exit(1);
}

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