1 /* $NetBSD: users.c,v 1.17 2016/09/05 00:40:30 sevan 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. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #ifndef lint
34 __COPYRIGHT("@(#) Copyright (c) 1980, 1987, 1993\
35 The Regents of the University of California. All rights reserved.");
36 #endif /* not lint */
37
38 #ifndef lint
39 #if 0
40 static char sccsid[] = "@(#)users.c 8.1 (Berkeley) 6/6/93";
41 #endif
42 __RCSID("$NetBSD: users.c,v 1.17 2016/09/05 00:40:30 sevan Exp $");
43 #endif /* not lint */
44
45 #include <sys/types.h>
46
47 #include <err.h>
48 #include <time.h>
49 #include <stdio.h>
50 #include <stdlib.h>
51 #include <string.h>
52 #include <unistd.h>
53
54 #include "utmpentry.h"
55
56 int
main(int argc,char ** argv)57 main(int argc, char **argv)
58 {
59 int ncnt = 0;
60 int ch;
61 struct utmpentry *from, *ehead, *save, **nextp;
62
63 while ((ch = getopt(argc, argv, "")) != -1)
64 switch(ch) {
65 case '?':
66 default:
67 (void)fprintf(stderr, "usage: %s\n", getprogname());
68 exit(1);
69 }
70 argc -= optind;
71 argv += optind;
72
73 ncnt = getutentries(NULL, &ehead);
74
75 if (ncnt == 0)
76 return 0;
77
78 /*
79 * XXX the utmp list belongs to getutentries and we shouldn't
80 * sort it in place. Since we don't call endutentries and we
81 * don't call getutentries again it doesn't matter, but it's
82 * untidy. Maybe give getutentries a sort function? It has to
83 * sort anyway if it's merging utmp and utmpx data.
84 */
85
86 from = ehead;
87 ehead = NULL;
88 while (from != NULL) {
89 for (nextp = &ehead;
90 (*nextp) && strcmp(from->name, (*nextp)->name) > 0;
91 nextp = &(*nextp)->next)
92 continue;
93 save = from;
94 from = from->next;
95 save->next = *nextp;
96 *nextp = save;
97 }
98
99 save = ehead;
100 (void)printf("%s", ehead->name);
101
102 for (from = ehead->next; from; from = from->next)
103 if (strcmp(save->name, from->name) != 0) {
104 (void)printf(" %s", from->name);
105 save = from;
106 }
107
108 (void)printf("\n");
109 exit(0);
110 }
111