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Annotation of 43BSDReno/usr.bin/users/users.c, revision 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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