1/*	$NetBSD: users.c,v 1.7 1998/02/03 04:19:15 perry Exp $	*/
2
3/*
4 * Copyright (c) 1980, 1987, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/cdefs.h>
37#ifndef lint
38__COPYRIGHT("@(#) Copyright (c) 1980, 1987, 1993\n\
39	The Regents of the University of California.  All rights reserved.\n");
40#endif /* not lint */
41
42#ifndef lint
43#if 0
44static char sccsid[] = "@(#)users.c	8.1 (Berkeley) 6/6/93";
45#endif
46__RCSID("$NetBSD: users.c,v 1.7 1998/02/03 04:19:15 perry Exp $");
47#endif /* not lint */
48
49#include <sys/types.h>
50
51#include <err.h>
52#include <stdio.h>
53#include <stdlib.h>
54#include <unistd.h>
55#include <string.h>
56#include <unistd.h>
57#include <utmpx.h>
58
59typedef char	namebuf[_UTX_USERSIZE];
60
61int	main __P((int, char **));
62int scmp __P((const void *, const void *));
63
64int
65main(argc, argv)
66	int argc;
67	char **argv;
68{
69	namebuf *names = NULL;
70	int ncnt = 0;
71	int nmax = 0;
72	int cnt;
73	struct utmpx *ux;
74	int ch;
75
76	while ((ch = getopt(argc, argv, "")) != -1)
77		switch(ch) {
78		case '?':
79		default:
80			(void)fprintf(stderr, "usage: users\n");
81			exit(1);
82		}
83	argc -= optind;
84	argv += optind;
85
86	setutxent();
87
88	while ((ux = getutxent()) != NULL) {
89		if (*ux->ut_user && ux->ut_type == USER_PROCESS)
90		{
91			if (ncnt >= nmax) {
92				nmax += 32;
93				names = realloc(names,
94					sizeof (*names) * nmax);
95
96				if (!names) {
97					err(1, "realloc");
98					/* NOTREACHED */
99				}
100			}
101
102			(void)strncpy(names[ncnt], ux->ut_user, _UTX_USERSIZE);
103			++ncnt;
104		}
105	}
106
107	if (ncnt) {
108		qsort(names, ncnt, _UTX_USERSIZE, scmp);
109		(void)printf("%.*s", _UTX_USERSIZE, names[0]);
110		for (cnt = 1; cnt < ncnt; ++cnt)
111			if (strncmp(names[cnt], names[cnt - 1], _UTX_USERSIZE))
112				(void)printf(" %.*s", _UTX_USERSIZE, names[cnt]);
113		(void)printf("\n");
114	}
115	exit(0);
116}
117
118int
119scmp(p, q)
120	const void *p, *q;
121{
122	return(strncmp((char *) p, (char *) q, _UTX_USERSIZE));
123}
124