| File: | src/usr.bin/users/users.c |
| Warning: | line 69, column 2 Value stored to 'argv' is never read |
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| 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; |
| 69 | argv += optind; |
Value stored to 'argv' is never read | |
| 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 | } |