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Annotation of 43BSDReno/usr.bin/users/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 provided
                      6:  * that: (1) source distributions retain this entire copyright notice and
                      7:  * comment, and (2) distributions including binaries display the following
                      8:  * acknowledgement:  ``This product includes software developed by the
                      9:  * University of California, Berkeley and its contributors'' in the
                     10:  * documentation or other materials provided with the distribution and in
                     11:  * all advertising materials mentioning features or use of this software.
                     12:  * Neither the name of the University nor the names of its contributors may
                     13:  * be used to endorse or promote products derived from this software without
                     14:  * specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
                     16:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
                     17:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #ifndef lint
                     21: char copyright[] =
                     22: "@(#) Copyright (c) 1980, 1987 Regents of the University of California.\n\
                     23:  All rights reserved.\n";
                     24: #endif /* not lint */
                     25: 
                     26: #ifndef lint
                     27: static char sccsid[] = "@(#)users.c    5.9 (Berkeley) 6/1/90";
                     28: #endif /* not lint */
                     29: 
                     30: #include <sys/types.h>
                     31: #include <errno.h>
                     32: #include <utmp.h>
                     33: #include <stdio.h>
                     34: 
                     35: #define        MAXUSERS        200
                     36: 
                     37: main()
                     38: {
                     39:        register int cnt, ncnt;
                     40:        struct utmp utmp;
                     41:        char names[MAXUSERS][UT_NAMESIZE];
                     42:        int scmp();
                     43: 
                     44:        if (!freopen(_PATH_UTMP, "r", stdin)) {
                     45:                (void)fprintf(stderr, "users: can't open %s.\n", _PATH_UTMP);
                     46:                exit(1);
                     47:        }
                     48:        for (ncnt = 0;
                     49:            fread((char *)&utmp, sizeof(utmp), 1, stdin) == 1;)
                     50:                if (*utmp.ut_name) {
                     51:                        if (ncnt == MAXUSERS) {
                     52:                                (void)fprintf(stderr,
                     53:                                    "users: too many users.\n");
                     54:                                break;
                     55:                        }
                     56:                        (void)strncpy(names[ncnt], utmp.ut_name, UT_NAMESIZE);
                     57:                        ++ncnt;
                     58:                }
                     59: 
                     60:        if (ncnt) {
                     61:                qsort(names, ncnt, UT_NAMESIZE, scmp);
                     62:                (void)printf("%s", names[0]);
                     63:                for (cnt = 1; cnt < ncnt; ++cnt) {
                     64:                        while (cnt < ncnt - 1 &&
                     65:                            !strncmp(names[cnt], names[cnt + 1], UT_NAMESIZE))
                     66:                                ++cnt;
                     67:                        (void)printf(" %.*s", UT_NAMESIZE, names[cnt]);
                     68:                }
                     69:                (void)printf("\n");
                     70:        }
                     71:        exit(0);
                     72: }
                     73: 
                     74: scmp(p, q)
                     75:        char *p, *q;
                     76: {
                     77:        return(strcmp(p, q));
                     78: }

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