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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1980, 1987 Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
13 | * 3. All advertising materials mentioning features or use of this software | |
14 | * must display the following acknowledgement: | |
15 | * This product includes software developed by the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #ifndef lint | |
35 | char copyright[] = | |
36 | "@(#) Copyright (c) 1980, 1987 Regents of the University of California.\n\ | |
37 | All rights reserved.\n"; | |
38 | #endif /* not lint */ | |
39 | ||
40 | #ifndef lint | |
41 | static char sccsid[] = "@(#)users.c 5.12 (Berkeley) 11/1/90"; | |
42 | #endif /* not lint */ | |
43 | ||
44 | #include <sys/types.h> | |
45 | #include <utmp.h> | |
46 | #include <stdio.h> | |
47 | ||
48 | #define MAXUSERS 200 | |
49 | ||
50 | main(argc, argv) | |
51 | int argc; | |
52 | char **argv; | |
53 | { | |
54 | extern int optind; | |
55 | register int cnt, ncnt; | |
56 | struct utmp utmp; | |
57 | char names[MAXUSERS][UT_NAMESIZE]; | |
58 | int ch, scmp(); | |
59 | ||
60 | while ((ch = getopt(argc, argv, "")) != EOF) | |
61 | switch(ch) { | |
62 | case '?': | |
63 | default: | |
64 | (void)fprintf(stderr, "usage: users\n"); | |
65 | exit(1); | |
66 | } | |
67 | argc -= optind; | |
68 | argv += optind; | |
69 | ||
70 | if (!freopen(_PATH_UTMP, "r", stdin)) { | |
71 | (void)fprintf(stderr, "users: can't open %s.\n", _PATH_UTMP); | |
72 | exit(1); | |
73 | } | |
74 | for (ncnt = 0; | |
75 | fread((char *)&utmp, sizeof(utmp), 1, stdin) == 1;) | |
76 | if (*utmp.ut_name) { | |
77 | if (ncnt == MAXUSERS) { | |
78 | (void)fprintf(stderr, | |
79 | "users: too many users.\n"); | |
80 | break; | |
81 | } | |
82 | (void)strncpy(names[ncnt], utmp.ut_name, UT_NAMESIZE); | |
83 | ++ncnt; | |
84 | } | |
85 | ||
86 | if (ncnt) { | |
87 | qsort(names, ncnt, UT_NAMESIZE, scmp); | |
88 | (void)printf("%.*s", UT_NAMESIZE, names[0]); | |
89 | for (cnt = 1; cnt < ncnt; ++cnt) | |
90 | if (strncmp(names[cnt], names[cnt - 1], UT_NAMESIZE)) | |
91 | (void)printf(" %.*s", UT_NAMESIZE, names[cnt]); | |
92 | (void)printf("\n"); | |
93 | } | |
94 | exit(0); | |
95 | } | |
96 | ||
97 | scmp(p, q) | |
98 | char *p, *q; | |
99 | { | |
100 | return(strncmp(p, q, UT_NAMESIZE)); | |
101 | } |