NetBSD/usr.bin/users/users.c

111 lines
3.3 KiB
C

/* $NetBSD: users.c,v 1.17 2016/09/05 00:40:30 sevan Exp $ */
/*
* Copyright (c) 1980, 1987, 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. 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1980, 1987, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)users.c 8.1 (Berkeley) 6/6/93";
#endif
__RCSID("$NetBSD: users.c,v 1.17 2016/09/05 00:40:30 sevan Exp $");
#endif /* not lint */
#include <sys/types.h>
#include <err.h>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "utmpentry.h"
int
main(int argc, char **argv)
{
int ncnt = 0;
int ch;
struct utmpentry *from, *ehead, *save, **nextp;
while ((ch = getopt(argc, argv, "")) != -1)
switch(ch) {
case '?':
default:
(void)fprintf(stderr, "usage: %s\n", getprogname());
exit(1);
}
argc -= optind;
argv += optind;
ncnt = getutentries(NULL, &ehead);
if (ncnt == 0)
return 0;
/*
* XXX the utmp list belongs to getutentries and we shouldn't
* sort it in place. Since we don't call endutentries and we
* don't call getutentries again it doesn't matter, but it's
* untidy. Maybe give getutentries a sort function? It has to
* sort anyway if it's merging utmp and utmpx data.
*/
from = ehead;
ehead = NULL;
while (from != NULL) {
for (nextp = &ehead;
(*nextp) && strcmp(from->name, (*nextp)->name) > 0;
nextp = &(*nextp)->next)
continue;
save = from;
from = from->next;
save->next = *nextp;
*nextp = save;
}
save = ehead;
(void)printf("%s", ehead->name);
for (from = ehead->next; from; from = from->next)
if (strcmp(save->name, from->name) != 0) {
(void)printf(" %s", from->name);
save = from;
}
(void)printf("\n");
exit(0);
}