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f42904bc | 1 | /* |
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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 are permitted | |
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6 | * provided that the above copyright notice and this paragraph are |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
f42904bc DF |
16 | */ |
17 | ||
18 | #ifndef lint | |
19 | char copyright[] = | |
57f00f07 | 20 | "@(#) Copyright (c) 1980, 1987 Regents of the University of California.\n\ |
f42904bc | 21 | All rights reserved.\n"; |
57f00f07 | 22 | #endif /* not lint */ |
f42904bc DF |
23 | |
24 | #ifndef lint | |
5e8b0e60 | 25 | static char sccsid[] = "@(#)users.c 5.6 (Berkeley) %G%"; |
57f00f07 | 26 | #endif /* not lint */ |
f42904bc | 27 | |
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28 | /* |
29 | * users | |
30 | */ | |
abe5b335 | 31 | #include <sys/types.h> |
407aebd6 | 32 | #include <utmp.h> |
abe5b335 | 33 | #include <stdio.h> |
407aebd6 | 34 | |
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35 | #define NMAX sizeof(utmp.ut_name) |
36 | #define MAXUSERS 200 | |
ff7e7f72 | 37 | #define UTMP_FILE "/etc/utmp" |
407aebd6 | 38 | |
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39 | static struct utmp utmp; /* read structure */ |
40 | static int ncnt; /* count of names */ | |
41 | static char *names[MAXUSERS]; /* names table */ | |
407aebd6 | 42 | |
ff7e7f72 | 43 | main() |
407aebd6 | 44 | { |
57f00f07 | 45 | register FILE *fp; /* file pointer */ |
407aebd6 | 46 | |
57f00f07 | 47 | if (!(fp = fopen(UTMP_FILE, "r"))) { |
ff7e7f72 | 48 | perror(UTMP_FILE); |
57f00f07 | 49 | exit(1); |
407aebd6 | 50 | } |
57f00f07 | 51 | while (fread((char *)&utmp, sizeof(utmp), 1, fp) == 1) |
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52 | if (*utmp.ut_name) { |
53 | if (++ncnt > MAXUSERS) { | |
54 | ncnt = MAXUSERS; | |
57f00f07 | 55 | fputs("users: too many users.\n", stderr); |
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56 | break; |
57 | } | |
58 | nsave(); | |
59 | } | |
ff7e7f72 | 60 | summary(); |
57f00f07 | 61 | exit(0); |
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62 | } |
63 | ||
abe5b335 | 64 | nsave() |
407aebd6 | 65 | { |
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66 | static char **namp = names; /* pointer to names table */ |
67 | char *calloc(); | |
407aebd6 | 68 | |
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69 | if (!(*namp = calloc((u_int)(NMAX + 1), sizeof(char)))) { |
70 | fputs("users: malloc error.\n", stderr); | |
71 | exit(1); | |
abe5b335 | 72 | } |
57f00f07 | 73 | bcopy(utmp.ut_name, *namp++, NMAX); |
407aebd6 | 74 | } |
abe5b335 | 75 | |
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76 | summary() |
77 | { | |
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78 | register char **p; |
79 | int scmp(); | |
407aebd6 | 80 | |
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81 | if (!ncnt) |
82 | return; | |
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83 | qsort((char *)names, ncnt, sizeof(names[0]), scmp); |
84 | fputs(names[0], stdout); | |
85 | for (p = &names[1]; --ncnt; ++p) { | |
ff7e7f72 | 86 | putchar(' '); |
57f00f07 | 87 | fputs(*p, stdout); |
407aebd6 | 88 | } |
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89 | putchar('\n'); |
90 | } | |
91 | ||
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92 | scmp(p, q) |
93 | char **p, **q; | |
abe5b335 | 94 | { |
57f00f07 | 95 | return(strcmp(*p, *q)); |
407aebd6 | 96 | } |