File: | src/usr.bin/users/users.c |
Warning: | line 68, column 2 Value stored to 'argc' is never read |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
1 | /* $OpenBSD: users.c,v 1.15 2021/07/12 15:09:20 beck Exp $ */ |
2 | /* $NetBSD: users.c,v 1.5 1994/12/20 15:58:19 jtc Exp $ */ |
3 | |
4 | /* |
5 | * Copyright (c) 1980, 1987, 1993 |
6 | * The Regents of the University of California. All rights reserved. |
7 | * |
8 | * Redistribution and use in source and binary forms, with or without |
9 | * modification, are permitted provided that the following conditions |
10 | * are met: |
11 | * 1. Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. |
13 | * 2. Redistributions in binary form must reproduce the above copyright |
14 | * notice, this list of conditions and the following disclaimer in the |
15 | * documentation and/or other materials provided with the distribution. |
16 | * 3. Neither the name of the University nor the names of its contributors |
17 | * may be used to endorse or promote products derived from this software |
18 | * without specific prior written permission. |
19 | * |
20 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
30 | * SUCH DAMAGE. |
31 | */ |
32 | |
33 | #include <sys/types.h> |
34 | |
35 | #include <err.h> |
36 | #include <stdio.h> |
37 | #include <stdlib.h> |
38 | #include <string.h> |
39 | #include <unistd.h> |
40 | #include <utmp.h> |
41 | |
42 | typedef char namebuf[UT_NAMESIZE32]; |
43 | |
44 | int scmp(const void *, const void *); |
45 | |
46 | int |
47 | main(int argc, char *argv[]) |
48 | { |
49 | namebuf *names = NULL((void *)0); |
50 | int ncnt = 0; |
51 | int nmax = 0; |
52 | int cnt; |
53 | struct utmp utmp; |
54 | int ch; |
55 | |
56 | if (unveil(_PATH_UTMP"/var/run/utmp", "r") == -1) |
57 | err(1, "unveil %s", _PATH_UTMP"/var/run/utmp"); |
58 | if (pledge("stdio rpath", NULL((void *)0)) == -1) |
59 | err(1, "pledge"); |
60 | |
61 | while ((ch = getopt(argc, argv, "")) != -1) |
62 | switch(ch) { |
63 | case '?': |
64 | default: |
65 | (void)fprintf(stderr(&__sF[2]), "usage: users\n"); |
66 | exit(1); |
67 | } |
68 | argc -= optind; |
Value stored to 'argc' is never read | |
69 | argv += optind; |
70 | |
71 | if (!freopen(_PATH_UTMP"/var/run/utmp", "r", stdin(&__sF[0]))) { |
72 | err(1, "can't open %s", _PATH_UTMP"/var/run/utmp"); |
73 | /* NOTREACHED */ |
74 | } |
75 | |
76 | while (fread((char *)&utmp, sizeof(utmp), 1, stdin(&__sF[0])) == 1) { |
77 | if (*utmp.ut_name) { |
78 | if (ncnt >= nmax) { |
79 | size_t newmax = nmax + 32; |
80 | namebuf *newnames; |
81 | |
82 | newnames = reallocarray(names, newmax, |
83 | sizeof(*names)); |
84 | |
85 | if (newnames == NULL((void *)0)) { |
86 | err(1, NULL((void *)0)); |
87 | /* NOTREACHED */ |
88 | } |
89 | names = newnames; |
90 | nmax = newmax; |
91 | } |
92 | |
93 | (void)strncpy(names[ncnt], utmp.ut_name, UT_NAMESIZE32); |
94 | ++ncnt; |
95 | } |
96 | } |
97 | |
98 | if (ncnt) { |
99 | qsort(names, ncnt, UT_NAMESIZE32, scmp); |
100 | (void)printf("%.*s", UT_NAMESIZE32, names[0]); |
101 | for (cnt = 1; cnt < ncnt; ++cnt) |
102 | if (strncmp(names[cnt], names[cnt - 1], UT_NAMESIZE32)) |
103 | (void)printf(" %.*s", UT_NAMESIZE32, names[cnt]); |
104 | (void)printf("\n"); |
105 | } |
106 | exit(0); |
107 | } |
108 | |
109 | int |
110 | scmp(const void *p, const void *q) |
111 | { |
112 | return(strncmp((char *) p, (char *) q, UT_NAMESIZE32)); |
113 | } |