Return to users.c CVS log

Up to [CSRG BSD Unix] / 43BSDTahoe / ucb

Annotation of 43BSDTahoe/ucb/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
        !             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: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.