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Annotation of 43BSDTahoe/ucb/users.c, revision 1.1.1.1

1.1       root        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 are permitted
                      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.
                     16:  */
                     17: 
                     18: #ifndef lint
                     19: char copyright[] =
                     20: "@(#) Copyright (c) 1980, 1987 Regents of the University of California.\n\
                     21:  All rights reserved.\n";
                     22: #endif /* not lint */
                     23: 
                     24: #ifndef lint
                     25: static char sccsid[] = "@(#)users.c    5.6 (Berkeley) 6/29/88";
                     26: #endif /* not lint */
                     27: 
                     28: /*
                     29:  * users
                     30:  */
                     31: #include <sys/types.h>
                     32: #include <utmp.h>
                     33: #include <stdio.h>
                     34: 
                     35: #define NMAX           sizeof(utmp.ut_name)
                     36: #define MAXUSERS       200
                     37: #define UTMP_FILE      "/etc/utmp"
                     38: 
                     39: static struct utmp utmp;               /* read structure */
                     40: static int ncnt;                       /* count of names */
                     41: static char *names[MAXUSERS];          /* names table */
                     42: 
                     43: main()
                     44: {
                     45:        register FILE *fp;              /* file pointer */
                     46: 
                     47:        if (!(fp = fopen(UTMP_FILE, "r"))) {
                     48:                perror(UTMP_FILE);
                     49:                exit(1);
                     50:        }
                     51:        while (fread((char *)&utmp, sizeof(utmp), 1, fp) == 1)
                     52:                if (*utmp.ut_name) {
                     53:                        if (++ncnt > MAXUSERS) {
                     54:                                ncnt = MAXUSERS;
                     55:                                fputs("users: too many users.\n", stderr);
                     56:                                break;
                     57:                        }
                     58:                        nsave();
                     59:                }
                     60:        summary();
                     61:        exit(0);
                     62: }
                     63: 
                     64: nsave()
                     65: {
                     66:        static char **namp = names;     /* pointer to names table */
                     67:        char *calloc();
                     68: 
                     69:        if (!(*namp = calloc((u_int)(NMAX + 1), sizeof(char)))) {
                     70:                fputs("users: malloc error.\n", stderr);
                     71:                exit(1);
                     72:        }
                     73:        bcopy(utmp.ut_name, *namp++, NMAX);
                     74: }
                     75: 
                     76: summary()
                     77: {
                     78:        register char **p;
                     79:        int scmp();
                     80: 
                     81:        if (!ncnt)
                     82:                return;
                     83:        qsort((char *)names, ncnt, sizeof(names[0]), scmp);
                     84:        fputs(names[0], stdout);
                     85:        for (p = &names[1]; --ncnt; ++p) {
                     86:                putchar(' ');
                     87:                fputs(*p, stdout);
                     88:        }
                     89:        putchar('\n');
                     90: }
                     91: 
                     92: scmp(p, q)
                     93:        char **p, **q;
                     94: {
                     95:        return(strcmp(*p, *q));
                     96: }

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